Recommendations for the step motor to the propeller F2D15Top: for the good of the motor in the optimum temperature conditions necessary to turning the motor on the ground ... 30000 29 000 rev / min, otherwise it just "freezes" during the flight.
It is recommended propeller with angles on the blades:
diameter 160 mm - 8 oz
diameter 140 mm - 10 grams
diameter 120 mm - 14 grams
If the angles of the propeller is not such - just heat the blade to the cigarette lighter (alcohol lamp) and screw to the desired angle and then measure the protractor on.
Via kordovie