...but I just do not understand why.
I've asked this before, but have to ask again with some better information and a few builds under my belt. I have a slight wiggle in the rear. Adding steer does not remove it. I can remove it by increasing the weight on the FDW, but this also slows the car down. In past races, I have seen cars shimmy like this; its not banging into the rail but just has a slight rear wiggle. Increasing the wheel gap on the rears exacerbates the wiggle, and I can almost eliminate it by decreasing the wheel gap. I was wondering if there is something I could do in my next build to eliminate this wiggle. Is it the drill, a slightly bent axle, weighting, wheels out of balance? It just seems to mean the less wiggle a car has (e.g. the more stable), the faster it would be.
Thoughts?
Car specs:
Body Thickness: 1/4"
Body Style: Ladder with Balsa ribs
Body Covering: Monokote
Fenders: Yes
Friction Plate: UHMW Polyethylene Film
Rear Axle: 3/4" from Rear
Rear Wheel Cant (drill): 3 degrees
Wheelbase: 4 3/8" (stock dist.)
Wheel Gap: a small as possible on rears
Wheels: DD4H 2g (Cheetah)
Axles: DD4H Dynasty Pro 92X
Left Rear: 2.430oz
Right Rear: 2.085oz
Right FDW: 0.485oz
Front Wheel Cant (drill): 4 degrees
Front Axle Bend: 1 degree (to adj steer)
Steer: 2 7/8" over 4'
I've asked this before, but have to ask again with some better information and a few builds under my belt. I have a slight wiggle in the rear. Adding steer does not remove it. I can remove it by increasing the weight on the FDW, but this also slows the car down. In past races, I have seen cars shimmy like this; its not banging into the rail but just has a slight rear wiggle. Increasing the wheel gap on the rears exacerbates the wiggle, and I can almost eliminate it by decreasing the wheel gap. I was wondering if there is something I could do in my next build to eliminate this wiggle. Is it the drill, a slightly bent axle, weighting, wheels out of balance? It just seems to mean the less wiggle a car has (e.g. the more stable), the faster it would be.
Thoughts?
Car specs:
Body Thickness: 1/4"
Body Style: Ladder with Balsa ribs
Body Covering: Monokote
Fenders: Yes
Friction Plate: UHMW Polyethylene Film
Rear Axle: 3/4" from Rear
Rear Wheel Cant (drill): 3 degrees
Wheelbase: 4 3/8" (stock dist.)
Wheel Gap: a small as possible on rears
Wheels: DD4H 2g (Cheetah)
Axles: DD4H Dynasty Pro 92X
Left Rear: 2.430oz
Right Rear: 2.085oz
Right FDW: 0.485oz
Front Wheel Cant (drill): 4 degrees
Front Axle Bend: 1 degree (to adj steer)
Steer: 2 7/8" over 4'