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anyone know how to calculate speed from gear ratio

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man o man wish i had gone to school that day, instead of to the pool hall. but i did win $20 from fred flinstone
 
i kinnda need help too, if anyone knows how many horsepower a CEN mg10tr2 with a stock 3.o engine has i would really like to know, thanks.

yo moe, do you know how many horsepower a CEN mg10tr2 with a stock 3.0 engine has?
 
sorry i dont know much about that engine. i think traxxas will not give out hp, dont know the reason. last year i found a few published numbers of rc engine hp. i wanted to know how much horse power per cubic inch the little engines put out. it came out to be about 10 horse per cubic inch avg. of course none of our engines are one cubic inch. the 10 hp per cubic inch is why they have a short life.

according to http://www.rev-line.com/18engine.html that engine has 1.2 hp at 25,000. rpm
 
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