Re: Gas R/C car
 

ok scratch the motor part above, because i worked for my boss for 5 hours and he gave me a 14 inch craftsman chain saw and it works perfectly, so i will be using that

the biggest problem is the vibration with it, anyone know where to get vibration reducers?

the best part is that it is loud as all hell :D :ahh:

some thing i need opinions on are if i should use the steering assembly from a t-maxx or make my own outta aluminum?

Re: Gas R/C car
 

You could start with a T-Maxx steering assembly. I'm just not sure how much of a beating it will take. If it brakes after just a little bit of bashing, you should just make a new one out of aluminum. It would be stronger for when you really go bashing and probably just a bit heavier, but the hard work would definitely be worth it.

And also, how powerful is the chainsaw engine you got? That's pretty cool that you got it from your boss.:D

For vibration, you can try using like, rubber washers or grommets, or cutting the surgical tubing that came in the kop and put that between the engine and the chassis. That's what we did for the electronics board this year. Well...it wouldn't really work that well for vibration, but somewhat for shock absorbing.

Re: Gas R/C car
 

i was thinking bout mounting the engine to a board or piece of metal then putting long bolts from that to the car chasis but putting springs between the engine and the chasis and putting a spring on top of the mount and puting a bolt through it all

bolt head
spring
engine board thingy
spring
chasis
nut

Re: Gas R/C car
 

I don't think springs are the right answer. I see that as being too wobbly. You don't need sprung mount, just a vibration insulated mount. I think rubber (like rubber washers) is a better option. Just make sure they aren't near anything too hot. What is the primary drive off the engine going to be? Chain? If so, you don't want your mount to be too sloppy where you lose chain tension or alignment.

Also, exactly how much does this thing vibrate? I have a weedwhacker engine and yes it vibrates but not all that much. I have held it in my hand (just the engine) while running it without a problem. (although if you try that don't blame me if you drop it or get burned or lose a finger or something) Could it be possible that your engine has lost it's balance somewhere along it's life?

As with any custom project, please post pictures along the way if you can. :)

Re: Gas R/C car
 

yea i am most likely going to use a chain see as how it is the easiest to control with movement.

how would a spring mount be too wobbly?

how thick of a rubber washer?

and it vabrates a little bit, deff less then 1/8", and i think prolly less then 1/16", most likely bout 3/64 in either direction, and if you have ever used a chain saw you will notice that it does vibrater a little bit, every small motor like that vibrates a little bit, especially with a small motor reving at prolly 2500+ rpms( i dont know how fast the motor goes yet

also what sized shaft do you think i should use for the back axel.

and what kinda wheel do you think would be suited best for a project like this, maybe just a replacement wheel barrel wheel, or like just a off road wheel?

i can think of lots of options but i want something that i can use on and off road, at first it will be just on road until i get suspension and everything built

Re: Gas R/C car
 

sparksandtabs instead of three posts in a row you can edit them into one post. Im no hipicrit so ill tell you i did it too when i started here and you find you get less angry messages if you try and not post in a row. As to Sanddrag i agree the unless you use a tensioner chain would be a mistake, however im not so sure about not using springs. Keep in mind the various springs available to consumers and their properties. Ive seen springs used for everything and anything and im sure the proper spring would achieve the result desired for this RC.

Re: Gas R/C car
 

I would just bolt the chainsaw engine straight to the chassis, you will probably want to isolate the electronics, mainly the receiver, somehow in a "vibration proof" box.

I would not use any T-maxx steering linkages/bell-cranks either because:

A. they only use one steering servo so you would have to modify it
B. the truck you are going to be building is probably going to be much heavier than a T-maxx
C. you could probably make something a lot more simple and stronger than the T-maxx steering linkages/bell-cranks
D. they are all plastic

You are most likely going to want something a lot "beefier" than T-maxx stuff being that a T-maxx is built around an engine that weighs probably under a pound, not an engine that weighs more than the whole truck itself.

Not sure what you are doing with shocks, but you don't want to use those either.

Re: Gas R/C car
 

so yea, now i have the whole control system and the chain saw(which i still need to get gas line for) i will be doing more with it after i am done painting my car, which has consumed my life til i am done