I’m finishing my first 020 replica, a 33” Strato Streak. As I have said in other post I’m a bit new to modeling and have no experience in power. I’ve collected some 020’s from ebay and two came with propellers. I have one 4” X 2.5” Thimble Drone and one 5” X 4” Tornado prop and both are plastic. APC sells a 4.2 X 2 and a 4.2 X 4 as 1/2a props. I assume, but don’t know for sure, that APC will be the only reliable source for smaller props now that Cox is out of business. Do I have that right?
I would greatly appreciate any comments or advice this community has to offer.
Dan, thanks for the recomendation. I have the APC props in hand but I have another problem. The hole in the props is way larger than the prop shaft. This is true for both the .020 and .049. Even with the supplied inserts the hole is to large. Do I shim with multiple layers of brass tubing?
There is a neater alternate. If you have access to a good drill press and a cooperative ACE Hardware, you can make some better shims.
ACE stocks some heavy wall aluminum tubing. In fact, I think some are OK without having to drill. If memory serves, I made mine from finding the tubing which fits inside the smallest adapter, and the inside diameter was perfect for the prop screw. At the very least, it did not take much drilling.
There is a second alternative that I have used with success and that is to cut a strip of paper (use quarto or A4 for the rest of the world) slightly wider than the prop hub and wind it onto the Cox shaft until the diameter matches the hole in the prop (I don’t use adapters or spacers). I then cut and rotate the prop on then and put a tiny drop of CA on the paper. Remove the prop/spacer off the shaft then soak the lot with CA then sand the excess away so that the spinner sit tight on the prop. I have done this on Cox, MP Jet and Cyclon engines, no problems.