Severe Wobble

[smylefixer]

Hi all,
First time posting a thread. This is my third year making cars for the pinewood derby. Came in first the last two years. Tough competition this year so I decided to build a rail rider. I also am using grooved axles. There seems to be alot of play in the wheel to the axle. Th center of gravity is about 1" in front of the rear axle. In testing the car on a test track there is alot of wobble in the rear wheels. Any thoughts?

[cubdad]

I am no pro at this but it sounds to me like you need more cant in the rear wheels. get tehm pushed out to the axle head better. I am sure someone will jump in with more info or at least more accurate info.

[smylefixer]

Just to clarify, The wobble is noticed in the rear of the car itself

[Lucky 13]

Jan 24, 2010 19:26:24 GMT -6 smylefixer said:

Hi all,
First time posting a thread. This is my third year making cars for the pinewood derby. Came in first the last two years. Tough competition this year so I decided to build a rail rider. I also am using grooved axles. There seems to be alot of play in the wheel to the axle. Th center of gravity is about 1" in front of the rear axle. In testing the car on a test track there is alot of wobble in the rear wheels. Any thoughts?

Are you running canted rear wheels ? What type of grooved axle are you using ? Are you running the new BSA wheels ?


Lucky 13

[smylefixer]

Yes,
I used the rail rider tool to cant the rear axles @2.5. The grooved avels have 4 shallow grooves purcashed from an online retailer. The wheels also purchased from the retailer with a coned hub both inner and outer.