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Title: math project on mx need help! Post by: k.p. on October 20, 2006, 04:21:37 PM hey guys im doin a project on mx!we have to make a poster board with 10 things on it that do with the sport and it has to do with math. i already have the ten subjects but i want ideas of how to do some of them
1.angle of jump 2.distance to make jump 3.speed to make it 4.tire pattern for better grip 5.weight of quad 6.diff. jumps i.e. double tripple table top etc. 7.body stance 8.performance parts 9.wind speed in air 10.gear ratio Title: Re: math project on mx need help! Post by: Sleazy_Rider78 on October 20, 2006, 07:12:00 PM how about how many miles or laps you can do on a tank of gas.
Title: Re: math project on mx need help! Post by: arod on October 20, 2006, 07:13:45 PM you left out suspension, kind of important.
Title: Re: math project on mx need help! Post by: qt314nfla on October 20, 2006, 07:17:55 PM Why are we doing YOUR homework? Draw some pics and use pythagorian theorem and crap to figure out angles of ramps or what not. Tradectory of jump will require the knowledge of physics due to the multiple factors. Good luck w/ your project.
Title: Re: math project on mx need help! Post by: k.p. on October 20, 2006, 07:21:13 PM your not doin my homework..i was figuring that most of you are older than me so you could help me do it thats all
Title: Re: math project on mx need help! Post by: MadMudder on October 20, 2006, 09:32:55 PM Why are we doing YOUR homework? Draw some pics and use pythagorian theorem and crap to figure out angles of ramps or what not. Tradectory of jump will require the knowledge of physics due to the multiple factors. Good luck w/ your project. Wow, dont u think that was a bit harsh... Hes just looking for ideas....Title: Re: math project on mx need help! Post by: qt314nfla on October 20, 2006, 09:34:30 PM Why are we doing YOUR homework? Draw some pics and use pythagorian theorem and crap to figure out angles of ramps or what not. Tradectory of jump will require the knowledge of physics due to the multiple factors. Good luck w/ your project. Wow, dont u think that was a bit harsh... Hes just looking for ideas....Oh good lord you ppl need to shut the hell up if you can't take a joke. Were you incapable of reading the rest of my post w/ IDEAS? Dee Dee Dee! Title: Re: math project on mx need help! Post by: Fox17 on October 20, 2006, 11:13:35 PM simmer down there QT.
call travis pastrana, he is brilliant when it comes to ramps and jumps and all that. he does all his and stuff. he will help you im sure. he is the man. if you showed up at his front door he would let you do whatever and do it wherever at his house. all you need is his number. Title: Re: math project on mx need help! Post by: rancher4lyfe on October 21, 2006, 01:09:13 PM simmer down there QT. call travis pastrana, he is brilliant when it comes to ramps and jumps and all that. he does all his and stuff. he will help you im sure. he is the man. if you showed up at his front door he would let you do whatever and do it wherever at his house. all you need is his number. THATS WUT I WOULD DO!! LOL Title: Re: math project on mx need help! Post by: UncleRico on October 21, 2006, 11:18:16 PM Here's some important formulas that engineer nerd types know for engine building and motorcycles...
You might find them interesting. Formulas for displacement, bore and stroke pi/4 = 0.7853982 cylinder volume = pi/4 x bore^2 x stroke stroke = displacement / (pi/4 x bore^2 x number of cylinders) Formulas for compression ratio (CylVolume + ChamberVolume) / ChamberVolume cylinder volume = pi/4 x bore^2 x stroke chamber volume = cylinder volume / compression ratio - 1.0 displacement ratio = cylinder volume / chamber volume amount to mill = (new disp. ratio - old disp. ratio / new disp. ratio x old disp. ratio) x stroke Formulas for piston speed piston speed in fpm = stroke in inches x rpm / 6 rpm = piston speed in fpm x 6 / stroke in inches Formulas for brake horsepower horsepower = rpm x torque / 5252 torque = 5252 x horsepower / rpm brake specific fuel consumption = fuel pounds per hour / brake horsepower bhp loss = elevation in feet / 1000 x 0.03 x bhp at sea level Formulas for indicated horsepower & torque horsepower = mep x displcement x rpm / 792,00 torque = mep x displacement / 150.8 mep = hp x 792,000 / displacement x rpm mep = hp x 792,000 / displacement x rpm mechanical efficiency = brake output / indocated output x 100 friction output = indicated output - brake output taxable horsepower = bore2 x cylinders / 2.5 Formulas for air capacity & volumetric efficiency theoretical cfm = rpm x displacement / 3456 volumetric efficiency = actual cfm / theoretical cfm x 100 street carb cfm = rpm x displacement / 3456 x 0.85 racing carb cfm = rpm x displacement / 3456 x 1.1 Formulas for tire size & their effect effective ratio = (old tire diameter / new tire diameter) x original ratio actual mph = (new tire diameter / old tire diameter) x actual mph Formulas for g force & weight transfer drive wheel torque = flywheel torque x first gear x final drive x 0.85 wheel thrust = drive wheel torque / rolling radius g = wheel thrust / weight weight transfer = weight x cg height / wheelbase x g lateral acceleration = 1.227 x raduis / time^2 lateral weight transfer = weight x cg height / wheel track x g centrufugal force = weight x g Formulas for shift points rpm after shift = ratio shift into / ratio shift from x rpm before shift driveshaft torque = flywheel torque x transmission ratio Formula for instrument error actual mph = 3600 / seconds per mile speedometer error percent = difference between actual and indicated speed / actual speed x 100 indicated distance = odometer reading at finish - odometer reading at start odometer error percent = difference between actual and indicated distances / actual distance x 100 Formulas for MPH RPM gears & tires mph = (rpm x tire diameter) / (gear ratio x 336) rpm = (mph x gear ratio x 336) / tire daimeter gear ratio = (rpm x tire diameter) / (mph x 336) tire diameter = (mph x gear ratio x 336) / rpm Formulas for weight distribution percent of weight on wheels = weight on wheels / overweight x 100 increased weight on wheels = [ distance of cg from wheels / wheelbase x weight ] + weight Formulas for center of gravity cj location behind front wheels = rear wheel weights / overall weight x wheelbase cg location off-center to heavy side = track / 2 - [ weight on light side / overall weight ] x track cg height = [ level wheelbase x raised wheelbase x added weight on scale / distance raised ] x overall weight Title: Re: math project on mx need help! Post by: dnigels on October 22, 2006, 10:39:49 AM I concur, with one small caveat! When calculating cg location off-center to heavy side, one must take into account whether the rider has a club foot or ate tacos for their pre-race meal! Other than that, spot on.
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