These props were designed by Rudi Freudenthaler. The blade shapes are efficient. They fold promptly. The Middleparts are small and do not produce wind resistance. Design your folding prop for electric flight using components:
A. Select Middlepart Yoke long enough so that the prop will fold fully.
B. Select the Spinner size that is recommended for the Middlepart.
C. Select the Prop Shaft Adapter that will fit your motor shaft. Balance the prop.
D. Select the Blade size.