Your motor should be your first priority. Motors are generally a 24-volt permanent magnet. Wheelchair motors seem to work best. If they don't come with a gearbox, you must reduce the RPMs by way of chain and sprocket, belt and pulley, or gears. Weak motors are the #1 reason 'bots fail. Start the whole building process with a proven motor. Stay away from window, windshield and starter motors. Industrial off-the-shelf motors are too heavy. You would do well by finding wheels that come with lightweight foam inside for flat proofing. House hazards and opponent weapons can end your day real fast. Rubber treads with a durometer rating between 55 and 70 work best. Leave the foam filling to the pros. There is no off-the-shelf stuff that works. Don't use hard wagon-type wheels, you need all the traction you can get. large tires (over 12") require LOTS of torque. There are only a handful of electronic speed controllers (ESC) that can hold up to the current demand of a battling robot.
Make sure the one you choose has been recommended by an experienced builder. DO NOT presume you (or your uncle) can build your own ESC. 99 times out of 100, you will see your creation give up the dreaded white smoke. 12-volt sealed-lead-acid (SLA) batteries have a lot of power, are not very expensive, but can be heavy. "D" or "C" size rechargeable NiCad's are lighter, but expensive. Only buy batteries that claim to deliver a "high amp discharge". Any battery you choose MUST NOT be able to spill its contents if pierced. SLA's must be absorbed glass mat or gel cell. Don't choose a battery that is underpowered for your need. The radio is really the only essential component that you can buy at a hobby store. Contact the competition you are building for, and see what their rules are for acceptable radios. It can vary from place to place. Don't skimp on your time to research the various competitions' radio transmitter requirements. You may end up fighting more than once and travel to other venues.
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Get cheap electric wheelchair,3 wheel electric scooter,big wheel scooter online from China drifting scooter wholesalers. helps you spend less money on more high quality electric wheelchair. Hope you have a happy shopping experience. Electric Wheelchair Manufacturerselectric high voltage manufacturerselectric pans manufacturerselectric breast enlargement pumps manufacturerselectric train rails manufacturersrc motorcycle electric manufacturersBIG BOUNDER H-Frame power chairs are configured specifically for bariatric users. They are custom built to each user's unique dimensions. The electronics and drive train are optimized at the factory for the user. Available in seat widths from 21” to 48”. Very narrow overall widths (as little as 2.5” wider than the seat width) result in improved maneuverability through doors and tight spaces. » 500 lb capacity is standard 700 lb and 1000 lb weight capacity options Seat Width: 21” to 48” Seat Depth: 12” to 23”
Seat Height: 19” to 25” Back Height: 15” to 24” * Some restrictions apply Recline, tilt, seat elevate, and reverse tilt Dual independent power elevating legrests (DIPLR) Toggle switch control or through-the-joystick proportional control ONE year warranty on entire chair 5 year warranty on Super Torque 3 Motor & Brake drive trains** 5 year H-frame base warranty 2 year H-frame seat warranty * Limited warranties - some restrictions apply. See complete warranty for more information ** Includes motors, brakes, drive wheels, drive wheel sprockets (drive belts, tires, inner tubes, flat-free inserts, motor sprockets and bearings not included) for users up to 700 lb All BIG BOUNDER H-Frame features and... » All frame members either .120” wall or solid bar stock » Solid Back posts » Cross strut welded between push handle tips or back posts » Reinforced seat mounts » Rated for a 700 lb user