Tuesday, May 17, 2016
Saturday, April 23, 2016
Wednesday, April 20, 2016
The Tamiya Carbon Front End and the TRF102
Ahh yes, the TRF102. Pretty dang good on asphalt. On carpet, hit or miss. The thing is, the chassis is thin compared to the rest of the Tamya line up, at 2.5mm. If the traction is up on carpet, it can get hard to drive.
I had brought the 102 with me to the TCS race at Access Hobbies in Springfield, Ohio in addition to the ever reliable F104WGP. I bounced back and forth between the cars during practice the day before the race. Towards the middle of the afternoon, temperature and humidity increased in the building and traction began to rise quickly. This brought out the wild nature of the TRF102, which can be a handful in these sorts of conditions. The car became very sensitive on the straight, and it did not put the power down very well out of the corners. The temptation of this car is, of course, the easy steering feel it has. If it can be tamed, the car should be faster than just about any of the other cars in the Tamiya line up as it steers far better throughout the corner. The problem is that much of this steering comes from the flex in the front of the chassis, which is a headache in high traction.
This is where the carbon front end comes in. Without the camber gain from the moving upper arm on the standard front end, and being made of much stiffer materials, the bite should be reduced overall.
I ran one pack with the standard front end. Traction was good on the track, and the car was a bit ill mannered. I switched out front ends, and started with silver springs not knowing what kind of bite I would get. I also went to the higher of the 2 camber settings, which I think is 2*.
The car was pretty good, but would lift the inside rear going into high speed turns. The front springs were too soft, so I went to the black spring, the heaviest. This made a big difference, and I also added a shim under the front knuckle to take a little droop out.
Both changes helped to flatten the car out. The car was much better, but it required a lot of steering throw to get around. I had an Xray servo saver on the car, so I added an Exotek ackermann extension to it. This part usually adds more bite to the front end, especially mid corner. I tried both settings available, and the most forward was a bit too much. The rear setting seemed a little better, not as hard to drive. Both the rear setting and the stock Xray servo saver produced similar lap times, and the plain Xray part may have actually been a little more consistent. It's the sort of thing that may take a little more testing to sort out, but I think ackermann changes will probably be an important part of the tuning arsenal for this front end.
On a carpet track, the front end made the car a lot better to drive, and got the lap times to a competitive level. On asphalt, I'm not sure if it would better subjectively, or just as a matter of taste in driving feel. I'm definitely going to find out, as I have seen the combination be on point outdoors. In any case, it's probably the front end to run for carpet if you want to use the TRF102.
I had brought the 102 with me to the TCS race at Access Hobbies in Springfield, Ohio in addition to the ever reliable F104WGP. I bounced back and forth between the cars during practice the day before the race. Towards the middle of the afternoon, temperature and humidity increased in the building and traction began to rise quickly. This brought out the wild nature of the TRF102, which can be a handful in these sorts of conditions. The car became very sensitive on the straight, and it did not put the power down very well out of the corners. The temptation of this car is, of course, the easy steering feel it has. If it can be tamed, the car should be faster than just about any of the other cars in the Tamiya line up as it steers far better throughout the corner. The problem is that much of this steering comes from the flex in the front of the chassis, which is a headache in high traction.
This is where the carbon front end comes in. Without the camber gain from the moving upper arm on the standard front end, and being made of much stiffer materials, the bite should be reduced overall.
I ran one pack with the standard front end. Traction was good on the track, and the car was a bit ill mannered. I switched out front ends, and started with silver springs not knowing what kind of bite I would get. I also went to the higher of the 2 camber settings, which I think is 2*.
The car was pretty good, but would lift the inside rear going into high speed turns. The front springs were too soft, so I went to the black spring, the heaviest. This made a big difference, and I also added a shim under the front knuckle to take a little droop out.
Both changes helped to flatten the car out. The car was much better, but it required a lot of steering throw to get around. I had an Xray servo saver on the car, so I added an Exotek ackermann extension to it. This part usually adds more bite to the front end, especially mid corner. I tried both settings available, and the most forward was a bit too much. The rear setting seemed a little better, not as hard to drive. Both the rear setting and the stock Xray servo saver produced similar lap times, and the plain Xray part may have actually been a little more consistent. It's the sort of thing that may take a little more testing to sort out, but I think ackermann changes will probably be an important part of the tuning arsenal for this front end.
On a carpet track, the front end made the car a lot better to drive, and got the lap times to a competitive level. On asphalt, I'm not sure if it would better subjectively, or just as a matter of taste in driving feel. I'm definitely going to find out, as I have seen the combination be on point outdoors. In any case, it's probably the front end to run for carpet if you want to use the TRF102.
Tuesday, April 19, 2016
Revisiting the TRF101
The TRF101 has been languishing on the shelf for a while now. I did have an initial good impression of the car, but it became apparent that the car just did not steer enough on carpet to be really fast. One thing I did notice was that it seemed to have better acceleration than most of the other Tamiya cars I had. That seems like a crazy thing to say, but maybe there is something to it.
One thing I noticed from Fred Medel's quote in an early post about the car was the mention in passing of the rear end and the car's stability: "With the TRF101 the car enters the turn with immense stability and there is no sign of the car wanting to continue to turn after applying throttle after the 180. It's just that stable. I believe this is the case because you now have a solid front end like the F103 on top of having the side links further apart."
That may be the key here - the width of the side links. The Xray style setup does have the battery sideways, but also ultra wide links compared to most of the Tamiya cars. Even more intriguing to me is the similarity to the SpeedPassion Sp-1. The rear end is almost identical, and I can say that the SP-1 made a lot of traction. The first time I ran it on asphalt, I was able to run the exact same laps and time I did as I did with the F104WGP I had been working on for quite some time. It was also very good on the not so good Pardus tires.
So maybe that stability helps the car put the power down. I was never a huge fan of the way the Version II F104 cars accelerated, but the 101 was good. Looking back, the thing that held the car back for me was the lack of steering . A simple change of the upper arms makes the front end the standard F104 spec, so it was worth a little investment of time to see if the TFR101 could be brought to life.
At the track, I first ran my F104WGP to baseline things, since I had just run it at the Access Hobbies TCS race. It was good there, so I figured the comparison would be good, especially since I planned to simply transfer the tires to the TRF car.
I was able to do a 9.7 hotlap, but that was sort of a freak lap. The rest of the laps were closer to a 10.0 average.
Putting the TRF car down, what I noticed right away was that it was really consistent. While I was a couple tenths off of the WGP car on average, I could knock out the same lap over and over. What the car was missing was quick transitioning in a couple S sections on the track. At first I had the car set up with the #2 plastic camber adjuster (.5* camber) and copper side springs, the softest. I had good success with the WGP car set to 2.5 camber, so I changed the TRF to 2.5 as well, and changed the side spring to gold, the second stiffest.
Now the car had the ability to transition quickly in the S sections. I was able to consistently do 9.9 and 10.0 second laps, and it still retained it's stability. I added a bit more front and rear droop as well which helped the car get a little more into the track. The best part was that I could stand on the brakes, which was important for the short chute in front of the driver's stand, and the end of the sweeper. I really enjoyed driving the car, as it was a dragster point to point.
In the next few runs, I tried some slight adjustments to the droop settings, to fine tune things. I also tried some of the other side springs, but settled again on gold. One thing that did make a difference was the center spring. I had tried a few, from the ultra heavy purple to a red sedan spring. What seemed to be best was a white sedan spring. The softer springs actually made the car a little unstable, and the really heavy one slowed it in the S turns.
One other option was the steel axle. For my style, I usually go a little faster with a steel axle, and it helped me as the car was now completely locked yet turned hard. Overall, I was surprised at how good this car was with a little time tuning it.
In the end, I feel like the results were unexpectedly good. The car was so enjoyable and worked so well, I just wanted to keep putting runs on it. My WGP car was really good at the TCS race I had attended, but I think my results might have been even better if I had run the TRF101. The consistency and corner speed were excellent. Really, this car just needed the standard F104 front end to come to life. I had been considering selling this car, but I think I may just hold onto it a bit longer....
One thing I noticed from Fred Medel's quote in an early post about the car was the mention in passing of the rear end and the car's stability: "With the TRF101 the car enters the turn with immense stability and there is no sign of the car wanting to continue to turn after applying throttle after the 180. It's just that stable. I believe this is the case because you now have a solid front end like the F103 on top of having the side links further apart."
That may be the key here - the width of the side links. The Xray style setup does have the battery sideways, but also ultra wide links compared to most of the Tamiya cars. Even more intriguing to me is the similarity to the SpeedPassion Sp-1. The rear end is almost identical, and I can say that the SP-1 made a lot of traction. The first time I ran it on asphalt, I was able to run the exact same laps and time I did as I did with the F104WGP I had been working on for quite some time. It was also very good on the not so good Pardus tires.
So maybe that stability helps the car put the power down. I was never a huge fan of the way the Version II F104 cars accelerated, but the 101 was good. Looking back, the thing that held the car back for me was the lack of steering . A simple change of the upper arms makes the front end the standard F104 spec, so it was worth a little investment of time to see if the TFR101 could be brought to life.
At the track, I first ran my F104WGP to baseline things, since I had just run it at the Access Hobbies TCS race. It was good there, so I figured the comparison would be good, especially since I planned to simply transfer the tires to the TRF car.
I was able to do a 9.7 hotlap, but that was sort of a freak lap. The rest of the laps were closer to a 10.0 average.
Putting the TRF car down, what I noticed right away was that it was really consistent. While I was a couple tenths off of the WGP car on average, I could knock out the same lap over and over. What the car was missing was quick transitioning in a couple S sections on the track. At first I had the car set up with the #2 plastic camber adjuster (.5* camber) and copper side springs, the softest. I had good success with the WGP car set to 2.5 camber, so I changed the TRF to 2.5 as well, and changed the side spring to gold, the second stiffest.
Now the car had the ability to transition quickly in the S sections. I was able to consistently do 9.9 and 10.0 second laps, and it still retained it's stability. I added a bit more front and rear droop as well which helped the car get a little more into the track. The best part was that I could stand on the brakes, which was important for the short chute in front of the driver's stand, and the end of the sweeper. I really enjoyed driving the car, as it was a dragster point to point.
In the next few runs, I tried some slight adjustments to the droop settings, to fine tune things. I also tried some of the other side springs, but settled again on gold. One thing that did make a difference was the center spring. I had tried a few, from the ultra heavy purple to a red sedan spring. What seemed to be best was a white sedan spring. The softer springs actually made the car a little unstable, and the really heavy one slowed it in the S turns.
One other option was the steel axle. For my style, I usually go a little faster with a steel axle, and it helped me as the car was now completely locked yet turned hard. Overall, I was surprised at how good this car was with a little time tuning it.
In the end, I feel like the results were unexpectedly good. The car was so enjoyable and worked so well, I just wanted to keep putting runs on it. My WGP car was really good at the TCS race I had attended, but I think my results might have been even better if I had run the TRF101. The consistency and corner speed were excellent. Really, this car just needed the standard F104 front end to come to life. I had been considering selling this car, but I think I may just hold onto it a bit longer....
Tuesday, April 12, 2016
Xray Aluminum Chassis Feedback
So after several races with the aluminum chassis on the new black CRC carpet, it's time for some thoughts...
Oddly enough, I sort of felt better about how the car set up with this chassis on the older gray CRC carpet. The first time it put it down, it was awesome. On the black carpet, it was a bit harder to nail the setup. However, this could also be partly due to the high bite at both the races I attended, especially the ROAR nationals in St. Louis.
Part of the problem at the ROAR race was a lack of mid corner steering. Going too aggressive with the front end would only result in a traction roll anyway, so my mistake may have been going with the least flexible front end parts on the aluminum chassis. I used the cross brace for the lower arms, and a pair of Xtreme racing lower arms which have extra bracing. I feel like that may have been what was limiting the car in the middle of the corner. Upon returning to my home track, which has the gray carpet, I went back to the standard lower arms and removed the brace. I felt like the car was a little more forgiving to get around the track. It was hard to tell how much this affected the mid corner steering, since the grip level was different, but at my track mid corner was good. I will return to the Ft. Wayne track in the next few weeks, so it will give a chance for me to revisit that issue.
I would like to point out that the eventual champion at the ROAR race and the rest of the local racers ran the graphite chassis on the car, and did not seem to have a big problem with traction roll. Sometimes the cars looked edgy at the start but they were able to manage that for the most part. Part of this may also have been the tire dope strategy. I noticed some guys doping their tires 15-20 minutes early, so that the compound would dry on the tires. I tried this as well and the car finished the race better. It also didn't seem to make the car any harder to drive. Letting the compound dry might have helped alleviate some of the initial oversteer/tire lifting that occurs when the tires are wiped just before the race.
In general, I think that the aluminum chassis makes the car very consistent, and reduces a lot of the tendency to traction roll. I probably went a little overboard on the stiffer components for the front end. I would imagine that the cross brace for the front end is not necessary in most cases with the aluminum chassis. The stiffer lower arms might be helpful depending on the level of traction. Being aware of how these parts affect the car, I'd like to test again on the black carpet. I should have a little more knowledge in a few weeks.
Oddly enough, I sort of felt better about how the car set up with this chassis on the older gray CRC carpet. The first time it put it down, it was awesome. On the black carpet, it was a bit harder to nail the setup. However, this could also be partly due to the high bite at both the races I attended, especially the ROAR nationals in St. Louis.
Part of the problem at the ROAR race was a lack of mid corner steering. Going too aggressive with the front end would only result in a traction roll anyway, so my mistake may have been going with the least flexible front end parts on the aluminum chassis. I used the cross brace for the lower arms, and a pair of Xtreme racing lower arms which have extra bracing. I feel like that may have been what was limiting the car in the middle of the corner. Upon returning to my home track, which has the gray carpet, I went back to the standard lower arms and removed the brace. I felt like the car was a little more forgiving to get around the track. It was hard to tell how much this affected the mid corner steering, since the grip level was different, but at my track mid corner was good. I will return to the Ft. Wayne track in the next few weeks, so it will give a chance for me to revisit that issue.
I would like to point out that the eventual champion at the ROAR race and the rest of the local racers ran the graphite chassis on the car, and did not seem to have a big problem with traction roll. Sometimes the cars looked edgy at the start but they were able to manage that for the most part. Part of this may also have been the tire dope strategy. I noticed some guys doping their tires 15-20 minutes early, so that the compound would dry on the tires. I tried this as well and the car finished the race better. It also didn't seem to make the car any harder to drive. Letting the compound dry might have helped alleviate some of the initial oversteer/tire lifting that occurs when the tires are wiped just before the race.
In general, I think that the aluminum chassis makes the car very consistent, and reduces a lot of the tendency to traction roll. I probably went a little overboard on the stiffer components for the front end. I would imagine that the cross brace for the front end is not necessary in most cases with the aluminum chassis. The stiffer lower arms might be helpful depending on the level of traction. Being aware of how these parts affect the car, I'd like to test again on the black carpet. I should have a little more knowledge in a few weeks.
Sunday, January 31, 2016
The Aluminum Xray...and a note on the Serpent wing
After some races with the Xray X1 on the new CRC black carpet, I was interested in possibilities of stiffening the car overall. The X1 has shown it capabilities on various surfaces from asphalt to carpet. This versatility is great since the car will be competitive almost anywhere, but sometimes there are areas where specialized parts help.
Jan Rathiesky showed up at the first ETS race of the season - on carpet- with the aluminum chassis on his Xray. (photo - RedRC)
This is probably a hint.
Anyway, what stood out to me after a couple of these events on the high traction CRC black carpet was that the new CRC F1 with the transverse battery looked awesome...and it was also very flat on the track. It rarely seemed to pick up a tire or traction roll. CRC's website does make mention of the high stiffness weave of their chassis. The car also has a solid lower arm, which I assume is stiffer than the Xray lower arm.
In any event, I wondered if trying to remove some of the flex in the Xray car could help in high traction.
I was able to get an Xray aluminum chassis as well as front lower arms by Xtreme Racing. They sell a lower arm with additional bracing for some more stiffness. I added both these parts to my car, keeping the setup close to see what, if any, difference could be found. Note that the aluminum chassis is 2mm vs. 2.5, so the links and the "football" pivot need a 0.5mm shim to maintain the proper orientation to the stock pod plate.
At the track, I prepared the tires as I did with the original equipment. Putting the car on the track, I noticed the car did not have quite as much mid corner steering as it had before, but it was very flat as it went around the track. This was good as there was recently a well attended series race at the track on the same layout and traction remained very good, though not as high as the CRC black carpet. I also felt like the car was smoother and more predictable all the way around the track. I could drive in a more on power style as well, which I prefer. Adding 0.5mm to the rear of the upper arm for a total of 2.5mm of dynamic caster spacing added the mid corner steering I wanted. It seemed like the car held better corner speed, as I could roll down in throttle and the car didn't seem to bog or "stop" in the corner as it did occasionally before.
Overall, the car gained a more composed feel on carpet. As good as the Xray car is, there have been times where getting the amount of steering into the car to be competitive could make it a little unpredictable. During on of the races, a marshall commented on how good the car looked, and how easy to drive it looked as well. It was really good for how little I had to change in setup. In a couple weeks I'll be attending another race on the new CRC carpet so a real shake down will occur then. I'm sure I'll have some more thoughts about the new chassis.
Serpent wing update:
I mounted the wing to the graphite tongue I made with aluminum screws. PLEASE USE ALUMINUM SCREWS HERE! I had a harsh crash in practice at full speed, and one screw sheared off. Nothing else was damaged. The aluminum screws are like a fuse that will pop off in a very bad accident and save the wing and/or the graphite parts on your car! I also wound up using 5mm spacers to keep the wing off the track....
Sunday, January 17, 2016
Bulletproofing the Serpent wing
It appears the object was to keep the front wing lightweight at the attachment, and maintaining a realistic look. Both were achieved, but a good crash will crack the wing. I attempted to rebuild and re-enforce my broken wing with J-B Quick epoxy and a piece of carbon fiber, but it broke just as quick again on the next practice run.
At home, I thought about what could be done, and I realized that just the wing itself could be attached as the Xray lexan wings are. I was able to remove the old wing pylon and drill the wing element for an Xray bumper.
At that point, I decided that while the Xray bumper certainly would be secure, it would probably be a bit heavy, and possibly strange looking. I decided to use some scrap carbon fiber chassis material to make an attachment using the same hole pattern as the Xray bumper. This would allow me to use either the Xray bumper or the carbon fiber. Not a bad option if the carbon fiber did not pan out in testing.
It didn't take too long to make a little tongue to mount the wing to the chassis. Not only is it light weight, but it allows some flexibility in how high the wing is mounted as well via spacers underneath the wing element.
All in all, this worked out fantastically. I ran it all day at the local series race, and there were no problems. The wing proved very durable once the attachment was improved. I noticed the lighter Serpent wing gives a little more steering and response, so the carbon fiber attachment only improves this aspect. At some point I will try to make a better finished version, but this prototype piece worked in an excellent fashion.
Sunday, January 3, 2016
F1 Flow Chart
I made this post over at RC tech, but I figured I'd copy it over here before it winds up pages back on the thread....
F1 Flow Chart:
TCS racing?
If yes, see below, If no skip directly to "Buy XRAY"
Do You race on carpet? If no skip directly to "Buy TRF102"
If yes, this is where things start getting interesting.
F104 t bar cars - you need to really look at the F104X1 (or a car optioned to the same spec) or the F104W GP. The X1 has fiberglass chassis parts which actually can be a good thing. It makes a little more traction and has a little more weight down low, which again is not all bad. I have witnessed several brutal beatdowns on high grip carpet with this car. Pretty well optioned if you can get a kit/car. Really the only things you may want are the carbon axle, and clamping hub.
The WGP car is very similar, however you will need to buy the standard F104 front end plastic parts and shorter turnbuckles as the car is an older "wide" 200mm car with the included F103 front end parts. That being said, it is the most well optioned F104 in my opinion. All pod parts are aluminum, chassis is graphite, it includes the aluminum front knuckles, and the t plate I like better. The t plate has a different flex point which I think makes a little more traction. You may also fit any of the other F104 t bars as well, noting that the standard F104 cars cannot use the WGP's tbar due to the larger chassis opening required. Last time I checked you can still find this car for under $200 USD at rc-art online from Japan.
These cars don't turn in quite as hard as a TRF102, which has a much thinner chassis and flexes more in general. That's not always a bad thing, but I have always found that you need to keep a good balance in the car's handling to make it driveable. The car will feel either a little dead off the center of the wheel or it will get a little unstable if you want a steering machine. This is not a concern if you are only racing other Tamiya cars but you will be off the pace vs. Xrays or cars with a similar layout. (off topic excursion coming...) In my experience, and that of even other guys who I feel are better drivers than I am, you won't get the ultimate pace of the other brand chassis. I have been to non TCS races where we threw the kitchen sink at it and in the end you just make the car hard to drive trying to keep up.
The TRF101 has some nice features, including the ability to move the links around and has a little more flexible chassis than the F104V2. Oddly enough, I always had the feeling that it accelerated much better than the other cars in the series, why I don't know. I haven't tried to measue the pod or anything to see if there is some difference, but whatever.
I really don't care for the front end. There is little adjustment and the design is less than optimal to use what should be good features. If you let the upper arm flex too much, the kingpins can pop out. Ride height can be hard to set where you want it. No caster adjustment, like the normal F104 front end ( well not really true since you get more caster the less camber you run). It actually would have been super simple to add to the design via a couple extra holes in the upper arm, but that's neither here nor there. It's simple, and camber is easy to adjust to the 2 positions offered, but on carpet you wind up searching for steering most of the time. At least the F104 front end lets you have 6 camber settings and the ability to add dynamic caster like a 1/12 car with different height ball studs. The more stable handling has seemed to work for some on asphalt. Trying a set of the normal F104 upper arm parts might make this car a little better, but I have always liked the feel of the t bar's more stable launch out of a corner vs Tamiya's link cars.
Getting to the TRF102, the biggest flaw is the chassis if you are going to race carpet. I have gotten this car to within a couple tenths of my Xray car on carpet, which is pretty good since I feel like the Tamiya front end does not produce the steering of the Xray. You need to strap the battery to the chassis and also use double sided tape to make the battery a "stressed member" to help stiffen the car up for carpet. Otherwise, every corner is an adventure if traction is up. For non TCS racing you could fashion an upper deck from scratch or cut up F104 parts, as the holes line up. This is semi effective, but you will get crushed by Xrays and their clones anyway. The other problem is that a lot of the steering is actually produced by chassis flex just behind the servo, so you can't just make it a tank.
I think the TRF102 is probably going to work out for carpet if you use the battery to get the car stiffer. It does have a good amount of steering that just needs to be tamed. Work still needs to be done to get it 100% dialed for carpet, in my opinion. Otherwise, I would go with an F104WGP, which just has a different feel, and can be really fast as well, and has a lot of good setup knowledge out there.
TCS racing?
If yes, see below, If no skip directly to "Buy XRAY"
Do You race on carpet? If no skip directly to "Buy TRF102"
If yes, this is where things start getting interesting.
F104 t bar cars - you need to really look at the F104X1 (or a car optioned to the same spec) or the F104W GP. The X1 has fiberglass chassis parts which actually can be a good thing. It makes a little more traction and has a little more weight down low, which again is not all bad. I have witnessed several brutal beatdowns on high grip carpet with this car. Pretty well optioned if you can get a kit/car. Really the only things you may want are the carbon axle, and clamping hub.
The WGP car is very similar, however you will need to buy the standard F104 front end plastic parts and shorter turnbuckles as the car is an older "wide" 200mm car with the included F103 front end parts. That being said, it is the most well optioned F104 in my opinion. All pod parts are aluminum, chassis is graphite, it includes the aluminum front knuckles, and the t plate I like better. The t plate has a different flex point which I think makes a little more traction. You may also fit any of the other F104 t bars as well, noting that the standard F104 cars cannot use the WGP's tbar due to the larger chassis opening required. Last time I checked you can still find this car for under $200 USD at rc-art online from Japan.
These cars don't turn in quite as hard as a TRF102, which has a much thinner chassis and flexes more in general. That's not always a bad thing, but I have always found that you need to keep a good balance in the car's handling to make it driveable. The car will feel either a little dead off the center of the wheel or it will get a little unstable if you want a steering machine. This is not a concern if you are only racing other Tamiya cars but you will be off the pace vs. Xrays or cars with a similar layout. (off topic excursion coming...) In my experience, and that of even other guys who I feel are better drivers than I am, you won't get the ultimate pace of the other brand chassis. I have been to non TCS races where we threw the kitchen sink at it and in the end you just make the car hard to drive trying to keep up.
The TRF101 has some nice features, including the ability to move the links around and has a little more flexible chassis than the F104V2. Oddly enough, I always had the feeling that it accelerated much better than the other cars in the series, why I don't know. I haven't tried to measue the pod or anything to see if there is some difference, but whatever.
I really don't care for the front end. There is little adjustment and the design is less than optimal to use what should be good features. If you let the upper arm flex too much, the kingpins can pop out. Ride height can be hard to set where you want it. No caster adjustment, like the normal F104 front end ( well not really true since you get more caster the less camber you run). It actually would have been super simple to add to the design via a couple extra holes in the upper arm, but that's neither here nor there. It's simple, and camber is easy to adjust to the 2 positions offered, but on carpet you wind up searching for steering most of the time. At least the F104 front end lets you have 6 camber settings and the ability to add dynamic caster like a 1/12 car with different height ball studs. The more stable handling has seemed to work for some on asphalt. Trying a set of the normal F104 upper arm parts might make this car a little better, but I have always liked the feel of the t bar's more stable launch out of a corner vs Tamiya's link cars.
Getting to the TRF102, the biggest flaw is the chassis if you are going to race carpet. I have gotten this car to within a couple tenths of my Xray car on carpet, which is pretty good since I feel like the Tamiya front end does not produce the steering of the Xray. You need to strap the battery to the chassis and also use double sided tape to make the battery a "stressed member" to help stiffen the car up for carpet. Otherwise, every corner is an adventure if traction is up. For non TCS racing you could fashion an upper deck from scratch or cut up F104 parts, as the holes line up. This is semi effective, but you will get crushed by Xrays and their clones anyway. The other problem is that a lot of the steering is actually produced by chassis flex just behind the servo, so you can't just make it a tank.
I think the TRF102 is probably going to work out for carpet if you use the battery to get the car stiffer. It does have a good amount of steering that just needs to be tamed. Work still needs to be done to get it 100% dialed for carpet, in my opinion. Otherwise, I would go with an F104WGP, which just has a different feel, and can be really fast as well, and has a lot of good setup knowledge out there.
__________________
Wednesday, December 30, 2015
25.5 in the USA
So 25.5 motor F1 has started to take hold in some parts of the country. There seems to be some out there that feel that this is the wrong direction for the class. The arguments range from "F1 should be hard" to "there will be a motor/battery war". I'm not sure what class does not benefit from good equipment, but making a class "hard", and creating barriers to entry is not the way for what is a niche class for most.
When the idea of 25.5 motors was first mentioned to me, I was ambivalent to the idea. 21.5 was working fine, and I didn't really see what the point was. At the same time, I figured if it got more guys involved, that is a good thing. There had been a slow decline in general F1 participation in many parts of the US, including Southern California, where UF1 started and built the class up. The series was pretty much over there.
The remaining guys decided to try something at the club races: 25.5 motors. Oddly enough, the same idea was tried in Cleveland Ohio at the Gate r/c club. Both places found pretty much the same thing, that the cars were much more docile, but produced almost the same lap times. Even more important, a wider range of skill levels could get the most out of the car, making better racing.
Bill Jeric and his Tuning Haus Scale Series in SoCal instituted the 25.5 motor, and they have increased F1 attendance. Both the Halloween Classic race at the Gate and the US Indoor Champs ran 25.5, and the racing was much better. There was a lot more racing and a lot less hanging on. Even at my home track, there is now a heat of cars weekly, where there was lucky to be any F1 racing outside of special events like the Tamiya series or UF1 MIDWEST.
I don't know if this is the answer for outdoor racing. While a little less motor should make an easier to tame car on outdoor surfaces with less bite, the tracks are bigger. There will still be a segment that will want to take advantage and go a little faster.
When the idea of 25.5 motors was first mentioned to me, I was ambivalent to the idea. 21.5 was working fine, and I didn't really see what the point was. At the same time, I figured if it got more guys involved, that is a good thing. There had been a slow decline in general F1 participation in many parts of the US, including Southern California, where UF1 started and built the class up. The series was pretty much over there.
The remaining guys decided to try something at the club races: 25.5 motors. Oddly enough, the same idea was tried in Cleveland Ohio at the Gate r/c club. Both places found pretty much the same thing, that the cars were much more docile, but produced almost the same lap times. Even more important, a wider range of skill levels could get the most out of the car, making better racing.
Bill Jeric and his Tuning Haus Scale Series in SoCal instituted the 25.5 motor, and they have increased F1 attendance. Both the Halloween Classic race at the Gate and the US Indoor Champs ran 25.5, and the racing was much better. There was a lot more racing and a lot less hanging on. Even at my home track, there is now a heat of cars weekly, where there was lucky to be any F1 racing outside of special events like the Tamiya series or UF1 MIDWEST.
I don't know if this is the answer for outdoor racing. While a little less motor should make an easier to tame car on outdoor surfaces with less bite, the tracks are bigger. There will still be a segment that will want to take advantage and go a little faster.
Sunday, December 13, 2015
What just happened??
Xray introduced the X1 a while ago, and proceeded to issue a bunch of beatdowns at the ETS races in Europe, among other places. Until this point, there were several ideas on how to build an F1 chassis, but most involved an inline battery.
The front ends were also hit or miss depending on which car you had. The Tamiya front end was pretty durable, and fairly adjustable if you threw the Exotek parts on it. It still had limitations. Speedpassion had some good ideas, but it was hard to set with the shims and graphite plate..maybe a bit complicated for what it did. Some others like CRC and VBC tried to be a little more straightforward yet functional.
So now there has been a sudden swarm of cars based on the "Xray layout" - transverse battery, graphite plate front end parts, and often, a bellcrank steering system.
The front ends were also hit or miss depending on which car you had. The Tamiya front end was pretty durable, and fairly adjustable if you threw the Exotek parts on it. It still had limitations. Speedpassion had some good ideas, but it was hard to set with the shims and graphite plate..maybe a bit complicated for what it did. Some others like CRC and VBC tried to be a little more straightforward yet functional.
So now there has been a sudden swarm of cars based on the "Xray layout" - transverse battery, graphite plate front end parts, and often, a bellcrank steering system.
Xray X1 2016
VBC LightningFX
Bringing back the old front end, but with the
bellcrank instead of direct steering
Roche Rapide
Exotek
Still retaining the Exotek IFS front end
TOP Racing
No bellcranks. adjustable servo angle
Serpent F110SF2
CRC
US Indoor Champs winner,
note machined bulkhead for upper link
So in the last six months, there seems to have been a consensus built on the success of the Xray X1. Only Tamiya carries on with an inline chassis configuration. Ironically, a Tamiya car has taken second place at the most recent ETS race in the Czech Republic. It's hard to know if Tamiya will introduce a car along these lines, knowing their desire to produce scale appearing race cars. The TRF102 was only introduced last summer, but the TRF line would be the only way that made sense for a pure race car to make its appearance.
In my own experience, the Xray cars have easily had .2 seconds per lap on a carpet track over a typical Tamiya car right out of the box. They did not seem to diff as badly, and overall had much more stability. On top of everything else, the front end adjusts easily, with all the aspects you'd like to control (camber , caster . roll center, camber gain, etc.).
Perhaps this is a sign F1 is gaining traction as a class worldwide and can finally have some staying power.
Many pictures stolen from REDRC
Subscribe to:
Posts (Atom)