Pick a Motor
I'd love to hear your feedback on this feature. It's new and needs validation.
Use this form to quickly select a list of candidate motors and minimum ESC and battery
recommendations for you airplane. The input required is simply the weight
of the airplane and the type of flying you plan to do. The goal isn't to provide
a solution for every type of aircraft out there. There are too many types of airplanes
out there to really make this work in a generic fashion. But if you have a plane
that is advertised as being a trainer, sport, 3D flyer, etc, then chances are the
approach outlined below can get close.
The approach the code takes is fairly simple:
1) If the user entered dry weight (no motor, no battery), then the dry weight is
bumped up by 40% to arrive at an all up weight.
2) Watts per pound is determined, based upon the selected type of flying. From this,
total power P is determined. Additionally, a target thrust T and pitch speed PS
are determined, again based upon the selected type of flying.
3) From the wattage figure, a pack voltage is selected based upon packs that are
commonly available today. For P<150W 2S is used, for P<275W 3S is used, for
P<400 4S is used, for P<600 5S is used, for P<1000 6S is used.
4) ESC rating is P/ + 15%, where V is the pack voltage determined in step 3.
5) The pack capacity, in mAH, is P/V * 100.
This will give about 6 minutes of flying
at full throttle, which is usually 10-12 minutes of flying for typical pilots.
6) A database lookup is performed, given the V and P targets, to find all motors
fitting those targets.
7) Given the target thrust T and pitch speed PS,every prop in the database is tested
on each of the candidate motors to see which props will exceed the T and PS targets.
When a first prop is found that exceeds the targets, that prop is noted and the
next motor is considered.
You can hover over the labels below (eg. "Sedate" and "Sport") to see the targets
for P, T and PS.
Suggested weight is 0.5 to 5 pounds