Looks good. POM is Acetal, a variation of Delrin. Fantastic material!
Which gearbox is that? Is that the shaft or a bolt I can see?
Did you use the sand moulding technique for the blades?
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Ok Frank, this is a nice work 
You cut the blades from a working prop to weld them on the folding part right ? It’s clever lol, nice one 
It is easy and fast for Prototyp building, not clever 
Aluminium welding is not o problem for me.
Now someone would have to draw CAD, because I can not do that to have a print version.
Pitch can then be slightly varied over the number of degrees.
Thanks
Greetings Frank
I will hopefully draw something if I get the time to
Frank, you have to consider the fact that both blades need to open & close at the exact same moment. You need to add gears on the folding parts to allow this, otherwise you are going with crazy dangerous prop.
Why do you feel that it’s dangerous without the gears?
Lift’s prop seems to be working very well without gears.
My biggest concern would be how well its balanced using Franks technique.
Balancing is importent.
The knifes brought no gear!
Many faltalbe Prop without gears, is not necessary!
Greetings Frank
I can do CAD for the hub if you like, but not for prop curves.
KUff.
Acetal ( Polyacetal) is Delrin and both are POM.
Delrin is nothing but a Name created by DuPont
All is POM. Polyoxymethylene. A nice engineering plastic. Too bad you can not glue it.
As long as we are not riding waves, the folding prop is not necessary.
I was also refering to balacing. What if a blade does open more than the other ? (perhaps if you have a little stone blocked there,…). I’m not a pro, just wondering
as long as you do not lose a blade, nothing happens.
The blade always aligns itself as far as the slightest resistance permits.
Even if they could swing forward without a mechanical stop, they would not do it
best regards Frank
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