rollmyown

KI8FR,
Sorry about the slow response. The prop hub is actually two pieces. Scott Baldridge made the front part of the Prop Hub assembly, the part that has the 7/16 shaft matching rear threads and the Knurling to drive the prop. I made the rear part to fill the space the Flywheel vacated. Of course you need a Lathe to make this piece. I just have a Taig Lathe with patience and perserverance. Cutting the slot for the Woodruff key is a challenge without a Mill or ?, but I do have a drill press. As I stated, I located the Magnet, from Radio Shack, a small 1/8" diameter Earth Magnet, 180 degrees from the Woodruff slot in a drilled hole in the rear, close to the outside diameter of the Magnet hub (rear Part). I rest of the hole has a plastic plug to keep the magnet in place. There is a center punch mark on the magnet hub so you know where the magnet is to set up the timing. Scott Baldridge probably has the dimensions I gave him to make the prop hubs. I might be the first to set up a long shaft Mac like this. I'll see if I can sketch these parts and post them in this thread. By the way, the P-47 prop nut is made from Fortal, an Aluminum alloy about equal to 7075, (good strength for internal threads) and the rear is drilled out to save weight. It looks like a revolver cylinder from the rear.