Prop MPH Chart
<div style="margin: 0in 0in 0pt"><span style="font-size: 9pt">I got a graphing program and was playing with it today here is a chartI madethat shows the theoretical MPH for a given RPM. Obviously your plane will not fly that fast but it gives you an idea of the speed of the thrust coming from the prop. It does kind of illustrate how the lower pitch props will let the plane slowdown at idle. There is likely a formula of the given MPH the model would approximately fly but I would think it would be widely different for wing profiles and airplane bulkiness. It would be interesting to get an idea maybe someone from the extreme speed forum has an idea but I don’t. I did put a gps in my plane that recorded max speed at 72 mph,the plane was spinning a 10x7 at 14500 rpm on the ground. </span></div>