RE: Propellers for Norvel engines
As for Props, I STILL like the 5x3 dubber ducky , the normal tip ones. I need to buy more. The cox 5x3 plastic are nice but snap easily.
But I fly control line, When we train kids, we like the old soft Topflight 6x3, it is so flexy that it won't break and and is more like a 6x2.
On my 0.74, I am liking the russian F2d props. Not cheap, but let the engine turn up. About a 6.5 x 3.5 but a thin blade that is a low load.
Prop screw is a M3 socket head which is 3.5mm I think. Our hardware stores have neet little cup washers that work better than the spinners with my starter.