Originally Posted by
tntpoof
.. max tire ballon is total of 4.125" not 6",, also battery voltage is wrong .. a 7.4 lipo charges to 8.4 volts not 7.4 all you stats are wrong A infrared speed unit will track a mouse as long as you get it in the crosshairs..check your facts.. all these guys on motorcycles that have gotten speeding tickets are void. get real.. another JAFA..
True, a lipos resting full charge voltage is 8.4 volts but as soon as you put a load across it you get a voltage drop. 7.4 is the nominal voltage so that is what I used. How about this you go to the speed calculator and input your values and post the results you get. The calculator is acurate. It is simple math.
3080 rpm per volt x battery voltage = max RPM (25872 RPM)
max RPM/pinion spur ratio (6.2:1) = RPM of Center driveshaft. (4172.9 RPM)
RPM of center driveshaft = RPM of pinion gears that drive diffs.
RPM of center driveshaft/ring pinion ratio (4172.9/2.3 = 1814 RPM = wheel rpm
wheel RPM (1814) x tire rollout 15.71 inches = distance traveled in inches in 1 min = 28502 inches per minute
28502in per min x 60 = inches per hour 1710120 in per hr
1710120 in per hr/12 = 142510 feet per hr
142510 feet per hr/5280 = 26.99 MPH
So unless you are using a 5s battery it is mathmatically impossible for your car to go that fast with the pinion/spur and motor combo. This is without aerodynamic drag or the parasitic loss due to the mechanical imperfections and drag in the drivetrain. I'm done arguing with you. You obviously have no grasp of mechanics or an in depth knowledge of how things work.
Good Day