The Wittman extension is fabricated, not cast. The conical portion is wrapped .125 aluminum sheet. There is a bearing holder in the nose for a wheel bearing from some model of GM full-size front-drive sedan. The extension shaft terminates in a taper that will take an old Continental taper hub from a tapered shaft A-65. There is no anti-vibration link in the plans for the unit that I have.
The original version of Great Plains' rear drive was not the bolt-on prop extension now in the catalog, it was a cast conical housing with a mounting hole for a starter. It looked to me like the extension length of the prop was pretty close, if not identical, to Steve Wittman's. An internal shaft ran from the flywheel to the prop hub. I don't know if the prop hub was also a Continental tapered hub. On Steve Wittman's V-Witt, the extended nosebowl acts as a plenum for his updraft cooling setup. He wrapped an oil line around the conical extension, stood off with spark plug wire separator "loom" clips, for oil cooling. He drove a magneto off the pulley end of the crank, and I seem to recall reading somewhere that the mag was from a forklift. This is the setup I'm using as a baseline for my powerplant installation. The mag will be belt driven like the original KR1 but will have to be turned around, sitting over (or under) the engine. On 11/25/2015 4:47 AM, Michael Ladigo via KRnet wrote: > I am talking about the drive Steve had many years ago.
