New Schumacher KF2
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#166
Stealth look done
#168
Black from inside. Tamiya ps-55 from outside for matte finish.
#169
Build went well
#170
I Removed most Of the slipper parts fully fasten it for stock carpet racing to reduce rotating mass
#171
I'm thinking of picking one of these up for stock. I'd definitely be doin the shorty conversion and the carbon chassis is it would be used for indoor clay in the winter and clay outdoor in summer. Neither are high traction. So I'm wondering, how does the rolling resistance of the belt system compare to a 3 or 4 gear tranny? Also, is it feasible to get this thing down around minimum weight? Assuming 220g for the battery.
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
#172
Coming from the b5M, I've noticed my KF2 has tremendous acceleration, but lacks top end. It's not substantial, but noticeable. What ground my B5M may gain in the straights will only be lost in the infield.
I'm loving my new KF2!
#173
What was the purpose of not going with the swapable side gears on the KF2? Does Schumacher plan on offering this as an option in the future?
#174
Tech Regular
iTrader: (3)
I'll be interested to see how eliminating the slipper works out in terms of durability long term. Do you think having little to no give on a high traction surface might be a little hard on the rest of the drivetrain? I think you mentioned a few posts back that you were running on medium traction carpet so perhaps it is not that much of an issue. I am assuming people you race against do the same thing in the stock class? Are you at a noticeable/measurable disadvantage running against other cars in the class that are set up this way?
The car looks sweet btw.
The car looks sweet btw.
#175
Tech Regular
iTrader: (3)
If you add up the mass of the shafts, side gears, pulleys and belt involved with the KF2 drivetrain I am betting it will compare similarly with mass of the gear transmissions found in other cars, maybe a little heavier. However, the belt and pulleys are more efficient than the gears in terms of friction so that might help to even the score.
Purely speculating I would expect a properly adjusted (tension) belt drive system to have negligible differences between a typical gear transmission in terms of overall efficiency.
#176
Tech Regular
I suspect they will be offering the alternative side gears in time as it was a good option when the traction wasn't there to use the high inertia ones. During the build I tried my ones from the KF and they could be made to work if I made some spacers.
Friction in the drive train and comparing gear to belts is a difficult one. If you try guessing by turning the transmission in your hand you would instantly say that gear was more efficient but their friction increases with load , but from driving belt driven cars I think the on power friction is fairly static under load whilst it seems to increase off power. I know in 4wd belt is more efficient as the bevel gears in shaft drive systems suck power when under load. Comparing a single belt to a gear transmission on a 2wd buggy though is tough.
Friction in the drive train and comparing gear to belts is a difficult one. If you try guessing by turning the transmission in your hand you would instantly say that gear was more efficient but their friction increases with load , but from driving belt driven cars I think the on power friction is fairly static under load whilst it seems to increase off power. I know in 4wd belt is more efficient as the bevel gears in shaft drive systems suck power when under load. Comparing a single belt to a gear transmission on a 2wd buggy though is tough.
#177
Is that a spacer I see? You'll have to post how this works out for you. I'm currently running the full slipper in stock.
Coming from the b5M, I've noticed my KF2 has tremendous acceleration, but lacks top end. It's not substantial, but noticeable. What ground my B5M may gain in the straights will only be lost in the infield.
I'm loving my new KF2!
Coming from the b5M, I've noticed my KF2 has tremendous acceleration, but lacks top end. It's not substantial, but noticeable. What ground my B5M may gain in the straights will only be lost in the infield.
I'm loving my new KF2!
I'll be interested to see how eliminating the slipper works out in terms of durability long term. Do you think having little to no give on a high traction surface might be a little hard on the rest of the drivetrain? I think you mentioned a few posts back that you were running on medium traction carpet so perhaps it is not that much of an issue. I am assuming people you race against do the same thing in the stock class? Are you at a noticeable/measurable disadvantage running against other cars in the class that are set up this way?
The car looks sweet btw.
The car looks sweet btw.
#178
I'm thinking of picking one of these up for stock. I'd definitely be doin the shorty conversion and the carbon chassis is it would be used for indoor clay in the winter and clay outdoor in summer. Neither are high traction. So I'm wondering, how does the rolling resistance of the belt system compare to a 3 or 4 gear tranny? Also, is it feasible to get this thing down around minimum weight? Assuming 220g for the battery.
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
#179
Thanks for all the responses! Very good point with how they behave differently under load. Assume 220g for the battery cause that's what mine weighs. Haha. I like to run a fairly large pack to reduce power loss
#180
I build the shocks emulsif with stock caps according to manual . What are the vented caps for ? do they have any advantage if you run emulsion shocks ?