formerly Quick'n'dirty

Video! updated 7/17/05

This is a Kyosho Twinforce. I was impressed with the realistic solid axle design.

It was originally designed for speed with 2 motors. I have it powered by a Black & Decker cordless drill motor/transmission. The transmission uses 2 stacked planetary reduction gearsets for a very useable crawl ratio. The output shaft has been machined down to fit the chain gear and the original spur gear support bearing. A little JB-weld and it's crawl time!

I'll eventually build a tube/link chassis but I'm having pretty much fun as is. One arm on each end has been wristed, springs trimmed, relocated shocks, locked the diffs, and did some tire cutting. That's it!

New mods:

Here you can see the lesson learned when you wrist your radius arms. The screws going in deeper wore a groove in the shaft until it snapped. oops

And the repair. 1/4" brake line and some gentle mig work and shorter screws.

The rear arms extended.

And some new steering including a custom arm. The caster has been rotated to zero, I think it steers on the rocks better this way. (who needs high speed stability on a krawler) 


Extending the rear radius arms ended up being a bad idea. Anti-squat was terrible.

The upper link.

The new axle trusses with servo mounts.

Steering arm detail.

Playing with excessive flex. 

tforce 015.jpg (110492 bytes)

Bead locks: That's a 3" SCH40 PVC pipe coupler I used as material for the inner bead rings, the inside diameter is perfect. The lock rings are plastic (inner) and aluminum (outer) 'cause that's what I had laying around. These now fit 40series.

bottom.JPG (46712 bytes)top.JPG (52651 bytes)

Shots as it starts to look like something. You can see the monoshock/swaybar setup.

Obligatory flex shots.

Revo shafts and adapters.

More Transformation!

The mono-shock setup was scrapped, too much antisquat. (again with the antisquat) (Antisquat: Rear of rig lifts and the axle is trying to drive under it. This raises the center of gravity and increases the potential for rollover.) So I decided since I don't ride in it, who needs suspension with vertical travel? So now the axles only twist with sway bars for chassis control.

tforce 004.jpg (43408 bytes)tforce 005.jpg (46329 bytes)tforce 006.jpg (66853 bytes)tforce 007.jpg (66920 bytes)tforce 008.jpg (98968 bytes)tforce 009.jpg (89942 bytes)

tforce 011.jpg (60268 bytes)cyclops 003.jpg (83507 bytes)cyclops 001.jpg (54582 bytes)cyclops 002.jpg (51518 bytes)cyclops 004.jpg (102834 bytes)cyclops 005.jpg (85122 bytes)

This is the front differential. The spiders are removed and my "locker" goes in. This gives a little slop in the front driveline to aid steering in tight quarters. The rear was simply glued.

New links using #10 hardware and 3/8" aluminum bar stock. Overkill??