rc car design

[joakim]

I have just seen another post in this forum "Who wants to help build a racing simulator" This will be somthing like that i hope...

And i have made a dwg of an rc car chassis (a starting point)

If its somone out there who have had the dream to build an rc car, it would be nice if we all could put our heads together and design it... (2 heads is better than 1)

So, download the dwg then do the changes you think is the best way to go, then upload it again. And in the end maybe we have a car that is worth trying to build.

I have wanted to try to fitt a chainsaw engine or something like that into it.
its 50cm long, the steering and things like that i didnt think so much about.
I guess its up to you guys to include it in the drawing...

The drawing was made in autocad 2007, but i saved it as 2004, so i hope as many as possible can open it. If there will be problems, i can post it as dxf (if that will help).

[joakim]

Here is the same file in DXF

[joakim]

I was thinking maybe it would be best to make it a 2wd...
Without diff, that way it would be real easy to make, and alittle more room
for the engine.
And since the chainsaw motor allready have a centrifugal clutch, that problem is solved. Or will it still spinn alittle without resistance?
The brakes are a different story, any sugestions?

[SORCHEROR]

the brakes are usually done with disc brakes similar to a cars,using a single disk that is activated by a servo,theres one stationary pad and the other floats the servo pushes them all together with a lever,theres a spring to open it back up again when released,or you couls use a drum with one pad the servo pushes against the drum,works but less power,the disks are better
steve

[joakim]

As you wish... Some brakedisks will be added.
I guess this would be 1 disk, since we dont have any differential.
Is it hopeless to just have rear brakes? or should it be front also?

Another thing....
Anyone know if its possible to use electricity from the chainsaw engine
to drive the servos? that would give a real advantage. (dont have to be conserned about low batteries) Since the engine have a coil, it must also
have a smal alternator, but will it be powerfull enough? I dont know the the normal voltage used in chainsaws, but i guess 6V or 12V

[joakim]

I have removed the 4wd, and put in a simple rear diskbreak (didnt make all the detail, but i guess its not that important at this moment)

[joakim]

I added some cool rims that i found here on the forum
the rims are made by UNCLE BUCK

But sadly i found a flaw... the car actualy seems wider than it is long...
hmmm... with the rims on, it was easier to see...
well, i post the drawing again beacuse of the cool rims...

well i seem to have made a few revisions so i will leave it alone
for a while, maybe someone else would like to do something...

Hmmm... seems like i have a problem...
the dwg file is now to big to upload (zipped)
I tryed to first devide it with rar na then zip it, but winzip doesnt alow that.

Atleast here is some pics, til i figure out what to do...
Any advice?

[pastera]

The coil in the chainsaw directy fires the plug - no low voltage.

You could wind another low voltage coil and mount at the flywheel to help with power drain but would still probably need batteries.

Aaron

[keebler303]

I have a 1/10 scale nitro truck and a little bigger version of that is basically what you have going. 2wd is a definate. I think you might want a differential, it will not turn as well without, but it will do mean burnouts and get better traction (2wd vs. 1wd). You will probably want some gearing between the chainsaw and the axle. A belt or chain from the engine to the gearset (or jackshaft with another sprocket set) would be in order. The commercial units use a disk brake on the input to the gear box. The brake is generally actuated by the same servo that operates the throttle. This setup is probably the easiest. A little linkage and springs make things work out well. I may have a few minutes to give you some help from time to time.

Good Luck
Matt

[joakim]

I think you are rigth, maybe its not that easy to get low voltage from a chainsaw, i will see what to do with it... first i need the motor.


I was thinking about using a chain as drive from the motor, maybe also try without a diff at first so it doesnt get so complicated to build...
It can be added a diff at a laiter point i guess. Atlest i want to build it so it can be added...

[Switcher]

Maybe this link will help you?
http://home.howstuffworks.com/chainsaw5.htm


.

[joakim]

Still haven been able to post the laitest dwg
Its to big... what can i do?