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im going to guess your actualy thinking of a nitro/glow fuel rc engine... NO, theres a reason you dont see many nitro powered robots..1 nitro engines are expencive, you need a engine, and a pipe tuned specificly for the type of driving/powerband you want ($175-300)2 slow acceleration, the beutifull thing about the electric motor is that its an on or off thing, it dosent have to reach its rpm power band nitro/glow and small gasoline engines must "spool up"3 nitro engines need to be broken in, they must be worn in, and if not done properly, the engine wont last long4 support equipment, you need a glow igniter/ bumpstarter/ shaft starter, a fuel bottle, fuel (nitro fuel is very expencive and a nitro engine is not very fuel efficient) oil to put in after running, oil for the filter, and a glow plug, and a infrared thermometer5 low run times, you can expect about a 10-15 minute run time on your average rc car sized tank of gas, much less if you dont tune properly6 MESSY, untill you have worked on a nitro, you have no clue how horable they are, in less then 3 runs they can get so bad you cant see the bolts on the thing7loud, a electric motor is fairly silent, a nitro motor is loud as hell , also they emit enourmus heat signatures, not very stealthy/hard to track8 the motor must be replaced periodicly ( about every 2 to 13 gallons depending on how well you treat it9 not needed, you want controlable, there is no need for a nitro motor to reach 25kmh, my friend has a fairly basic truck that reaches 100kmh easyif you realy want to, go for it, but its going to be alot of work to be able to say... i have a nitro robotfor power might i suggest a differential drivepowered by 2, 540 can motors (http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFBH5&P=7) best high torque, high speed motor i ever used.now, the motors by themselves will not have much torque, look online for a electric rustler or stampede transmision. this will give you a nice gearing to get you easily to 25km,as for treads or tracks, i dont know, wheels would be the easyest. and for the transmisions, youwill need to find a way to mount the wheels to the output shafts.my brain hurts now, im going to go rest it, might ad/edit later
if its going to be off road mostly then I'd say tracks or 4 tires.don't look at me with questions about digital stuff and programming