Mini-X Motor Mod results

[baleisen]

I finally finished repairing my X.
It has the green motor can.
I can't find the magnets so they weren't changed.
I have the 6 battery set but am using a 4 set right now.
It didn't need the motor caps. It might when I switch to the shreder rx from my Hyperfly.
It has the carbon brushes also.
It runs well.

If anybody knows of a lexan truck body I'd like the site. TIA.

[helldriver]

I ran with 6 cells, bearing can, stock end-bell but I took off the brass bushing and replaced with bearing (as Takumi advice..). After 10mnts the FET got a bit warm so the motor truns to be as 'finger burner'. But it ROCKS..!! Still trying to mod to a monster.

[Tbird Man]

Originally posted by j0llyr0ger
Hello, everyone. This is my first post here.

My suspicion is that the tendency of the mini-x to spin to the right but not the left is mainly due to gyroscopic recession. That is, the tendency of a gyroscope to react to turning moments applied to it's axis perpendicularly to the applied force.

Since the car is so small and light, it may exhibit some behaviors larger cars don't due to the fact that such things as gyroscopic recession are proportionally so much smaller on larger cars.

Think about it- the motor spins clockwise and the car spins clockwise much more easily.

Adjusting the EPA may compensate somewhat for the tendency to spin, but I believe it would not actually fix the problem. If you do try to compensate with EPA you might want to think about giving the steering less travel to the right than the left. The car already likes to turn right more than left, so instead of reducing both, simply reduce the right side travel until the reaction in that direction is reduced to match the reaction to the left. You don't want to throw away any left side steering travel- you need all you can get.

This idea occured to me after visiting the Champlin Fighter Museum in Mesa, AZ today http://www.champlinfighter.com and hearing a docent talk about how the Sopwith Camel turned so very much better to the right than the left for the very same reason- gyroscopic recession of the radial engine.

Or I could be flat wrong.
It's very late and my brane is tired.

yes, what your talking about is called "torque steer" and is a big issue with shaft drive RC cars. you may also notice it on take off, it will tend to pull one way.

[3series takumi]

torque steer is normally a problem caused by uneven axle lengths or an off centered diff. more power tends to go to the wheel with the shortest distance between the wheel and diff. the minix has equal everything so that is not the problem and with mine takes off it doesnt pull at all. the problem is that fact that the motor spins one direction pushing the chassis in the other direction. so in one direction the chassis is gettin pushed with the turn and the other direction it is gettin pushed against the turn. to over come it you can do what TA did to the TC3 (shaft drive car) and add a touch of camber on the problem direction to tune out the spin or tune spin into the other side if drifting is your style of driving. oh yeah and torque steer is more commonly found on front engine front wheel drive cars with a transversal engine set up. ;p thats a mouth full.

[Tbird Man]

well my tamiya tl01 has massive torque steer, and it has equal length axle shafts all 'round. the motor even sits transverse, it is the shaft drive that does it.