Originally Posted by ysolomon
Wow! This thread has been "dead" for the last 6 months, and yesterday, just as I started planning the continuation of the build--three posts... I was going to go with MAS 16x10x3 props. I have two of them. But I also bought two Zinger 18x12x2 props, so we'll see. In both cases, I have (and will be using) one "regular" and one "counter rotating (pusher)" prop (remember that I have an electric setup, so I have the ability to decide that one of the motors will go in reverse. If I loose one in the air, I don't have a "critical engine" problem this way. Both props will turn TOWARDS the fuselage (the prop top turns towards the fuse). To address the concern of the counter rotating prop nut getting loose I will be drilling two holes through the prop and the prop shaft base and put thin pins through them.
All you need are anti-vibration washers, the ones with the teeth on the inside, between the prop clamp washer and the prop nut. This is how I secure the props on my big A-26.