How about this It is small and at 7.4 volts you have 80.88 oz of torque
http://www3.towerhobbies.com/cgi-bin...?&I=LXAEXY&P=7

http://www3.towerhobbies.com/cgi-bin...?&I=LXDTB4&P=7
This is around 50 oz torque at 4.8 volts and 63 oz at 6vots.
It sounds like a cool design show us some pics when it's done.

thanks for the links!

I hope it helps

yes they did. i actually chose a different one from the ones you listed, but yours put me in the right section. Im a little worried about the speed, but it shouldnt matter very much honestly. and i can always step up the traxxas steering servo if i need.

Does anyone know what the center posistion is on the traxxas stuff? this one says 1500... umm in not sure what unit taht was is lol)

just want to make sure these will work with the radio.

I'm glad I was able to point you in a direction anyway The easiest way I found to center the servo was to hook it up and center it with the radio.

im using er9x for this project so that shouldnt be to hard.

Originally Posted by MXDesigns

perhaps the idea you are picturing, and the idea i am picturing are two different ones. In my model there is 0 change in steering angle throughout the entirety of the suspension travel. linkage placement and design is responsible for this, and well..to be honest just the fact that i know how to design a good linkage setup .

Did you test the model at different steering angles, or just with the servo at neutral? The nature of a servo arm changes the geometry greatly as you give it steering input in this case.

Originally Posted by MXDesigns

you are correct, it would increase unsprung weight but thats not a concern for this application, also its possible to incease spring rates to compensate. as far as a wire goes, thats nothing a skidplate or metal tube cant fix

Increasing spring rate doesn't negate the downsides of increased un-sprung weight. For lower speeds it'll drive ok, but if you're after performance nothing is a good replacement for less un-sprung weight.

As the steering link is on the suspension arm I can imagine the suspension travel has no impact on the steering angle. But the added weight on the suspension arms will increase the inertia of the suspension. And this will affect the ability to absorb bumps.

How about a compromise? Use one servo for each side, but still have these mounted on the chassis. That way you have low slop steering, with the option to change Ackerman "on the fly" with the ER9x mixers.

wparsons, again, its been modeled, and again, you might be picturing something totally diffrent than what i have modeled. but yes.. again.. there is 0 change in angle regardless of steering posistion or suspension travel

that said....

solo ... im seriously considering moving the servos inbound. i have a design that will still eliminate MOST of the bump steer, while give less unsprung weight. Originally i didnt want the linkage "outside the box" (at least what im calling a box) for asthetic concerns. however this design DOES still call for 2 servos to be able to angle the linkage properly to prevent the bump steer. also, by mounting them inboard i can posistion them farther forward helping the weight distribution greatly. Im not sure without doing a little more work, but i think if i take this route i may even be able to get away with using stock (or aftermarket) steering blocks and not have to make my own.

I would love to see models of it, anything I've drawn up shows that you would have a change in steering angle through suspension travel. The only way I can see it working is if you're mounting the servos vertically, which would create all kinds of clearance issues.

Instead of two inboard servos, why not a single servo with bellcranks or a steering rack? They're both well proven designs that work VERY well on high end race vehicles.

I think the reasons are to try out if it works. And having 2 servos does allow for quick adjustment of the steering geometry without having to get the tools out. If you want to do speedruns, simply set some toe-in for better stability. On a curvy track, some toe-out for better cornering. You can adjust Ackerman by simply altering the mixes. The ER9x software is very versatile.

Whether it will give a big improvement in handling, remains to be seen, I agree. In a race car simplicity often pays off, and single servo steering will probably be more reliable. Still it makes interesting reading.

Originally Posted by SoloProFan

I think the reasons are to try out if it works. And having 2 servos does allow for quick adjustment of the steering geometry without having to get the tools out. If you want to do speedruns, simply set some toe-in for better stability. On a curvy track, some toe-out for better cornering. You can adjust Ackerman by simply altering the mixes. The ER9x software is very versatile.

Whether it will give a big improvement in handling, remains to be seen, I agree. In a race car simplicity often pays off, and single servo steering will probably be more reliable. Still it makes interesting reading.

ding ding ding.. we have a winner! you can also have toe in toe out based on throttle input. the more throttle you give, the less toe, or if you want to do just left hand turns..just adjust the right wheel till its right...but there is more to it than that ill post pictures when the project is done and the designs are all copy righted.

Sounds like a fun project, hopefully you enjoy the work! I don't see it performing better than what's currently used on higher end race vehicles, but as a project to try out an idea it could be fun.

who said it was for racing?

If it's not for going fast, why the need for toe mixing, etc?