4wd Corr/Pro-4 Truck REDESIGN POSTED 12/23/09

[MetalMan]

Despite what it may look like, this project has been more alive than ever. I've been putting lots of time into it (too much!) just about every day, just wish the results were more indicative...

So far I have the MT2 front end built-up, the front (independent suspension) portion of the chassis is near completion, the upper deck for the front is being worked out, the Wheely King axle has been widened and has custom c-clamps to hold the shocks and upper/lower links, the link lengths have been determined, and I have come up with a viable suspension geometry (after much playing around with various mounting positions). Here are side views of the 4-link geometry:

Fully extended/uncompressed:


Compressed/maximum travel:


And a comparison of the two:


The rectangle to the left of the links represents the c-clamp, and where two lines cross that represents a hole on the c-clamp where something can be mounted. The very middle of that c-clamp is in line with the center of the axle. The most-vertical member is the shock.
When I came up with this geometry, I was trying to keep a good pinion angle, as this will be very important. Another important factor was the change in wheelbase that occurs as the suspension cycles. This geometry causes the wheelbase to change only 0.05" from fully extended to fully compressed. Overall wheel travel is about 2 inches.

This truck will use an outrunner in direct-drive-to-diff fashion, and is a KMS 2826-06 (730 kv), a cheaper version of the Axi 2826-12. I bought the Axi "Cooler" fan for the motor to potentially reduce temps. The ESC will be a MM (on its way to me from CC), and for batteries I will run 3s at the track for ~35mph top speed and 4s for about 45mph when this truck is in Slayer-killer mode .