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Old 04-10-2008, 04:47 PM   #16
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Originally Posted by party_wagon View Post
If you are allowed to use two motors then just hook up a motor to each wheel & use steering like a tank. Not to mention you will have double the power. Then you can pick up a cheap 4 ch plane radio & use the 2 joysticks for your two throtle servos w/ reverse. I mean, two $50 escs, two $30 motors, a $50 radio, $40 in tires? That should easily land in your budget. You can build a chasis shaped like a T. Then go and mount the wheels w/ motors on each side & then mount the other wheel which is nothing but balance, you want it to slide around. If you are only allowed to use one motor then hook up the motor to a diff & use a braking system that will allow you to lock one wheel & deliver power to the other wheel.
Ya a cheap radio that has elevon (sp?) mixing will take car of the throttle and steering for you. I set this up in my shop once. I put two esc's on the elevator and aileron channel and they set the radio to mix them. It drives just like a regular car, except it only uses one stick. Up down on the right stick is forward/reverse and left/right is differential speed (steering). You could do the same thing with a regular 2 channel radio and this


Unfortunately, for the sounds of it, you only get to use 1 motor
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Old 04-14-2008, 07:30 PM   #17
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Thanks for the many suggestions and sorry that i haven't been able to reply sooner. I am actually in 3 design classes this quarter The restriction given is pretty strict and can't be changed nor bent. Everything used has to be well documented and bought new w/ receipt. Oh,we can only have 1 motor and a servo for steering.

The group has decided have a larger 1 rwd and 2 front for steering. The chassis is modeled around the battery and most of the component lies ontop of the battery so the vehicle is slim and compact. We are still unsure of whether to have a rear suspension but so far the CAD model has the shocks set 45 deg and between the rear wheel axel and a brace from the chasis. From the CAD drawing, the center of mass is also at equal distance between the tires and approx the height of the rear tire.

These are the rear tires we're currently considering:

We are still a little worried about traction since we will be driving on tiles. Then again, I read that our motor isn't very powerful. How does everything sound so far? We are also required to test in a wind tunnel.. Would it be ideal to mold to body over the entire front that are sticking out or just the main body?
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Old 04-15-2008, 01:17 AM   #18
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I'd suggest avoiding foam tires on a tile surface. You will get virtually no traction. I think an offroad tire with small pin spikes or a softer rubber tire with with some sort of tread will work best. Perhaps something like this https://www.ssl-stormerhobbies.com/c...ns&pn=ORN76403 or this... https://www.ssl-stormerhobbies.com/c...ns&pn=ORN76415 If you do decide to go with foam I'd suggest something for a 1/8th scale car so you have a larger contact patch. Also, I think you'll get the best aero from having the body over the front. suspension and tires/wheels.
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Old 04-15-2008, 01:58 AM   #19
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Im soon to be an engineering student so here's my input....try making the layout 2-wheels steering and one huge thick wheel at the back like the concept cars developed and recent motor shows...

The reason is having one front wheel for steering I fear would have not enough steering for you to manuevour around slalom courses.....for backwheel traction try using those nitro 1/8 rear foam wheels.......try using softer shores.....should be sufficient for traction.......
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Old 04-15-2008, 11:15 PM   #20
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hmm, a lot of mix inputs on the tires.. The tiles is outdoors so it isn't polished and shiny but they are much smoother than concrete.
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Old 04-15-2008, 11:42 PM   #21
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personally id make sure u have a lot of suspension articulation as this will increase weight transfer giving u more grip which u will need on the slippery tiles
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