Brodhead Pietenpol Association

Original Posted By: "walter evans"
Not that I will be needing it for a while, but what are the prop hubs forthe corvair made of? I believe Wynne's uses aluminum. I intend to buildmy own, but I don't see why such a long extension is generally used. Seemsto typically be about 3 -4". I think just over an inch to get the propclear should be fine and keeps the bending moment closer to the mainbearings. I suppose the flywheel bolt pattern is just too small a diameterto handle the bending forces. Suggestions?Wayne Sippola, Winnipeg ________________________________________________________________________________

Original Posted By:> wayne
Wayne,my hub was machined from 6061T6,shaft into crank,and spud nut,andwasher of 4340. Doug HuntAlberta----------

Original Posted By: vistin(at)juno.com
Wayne,Sorry I haven't had the time yet to make you a drawing, but I promise you Iwill.I made my prop hub out of 4130. I paid for one to be made to my specs,including the prop shaft. Those drawings I'm sure I have somewhere, I'll digthem out and send them to you. I personally would not use alum. Yes you cansave weight but the corvair needs the weight there to help with the flywheel effect, even though it is low effect being so close to the center.Dom.________________________________________________________________________________

Original Posted By: RBush96589(at)aol.com
> > > Not that I will be needing it for a while, but what are the prop hubs for> the corvair made of? I believe Wynne's uses aluminum. I intend to build> my own, but I don't see why such a long extension is generally used. Seems> to typically be about 3 -4". I think just over an inch to get the prop> clear should be fine and keeps the bending moment closer to the main> bearings. I suppose the flywheel bolt pattern is just too small adiameter> to handle the bending forces. Suggestions?> Wayne Sippola, Winnipeg > > > > > ________________________________________________________________________________