Back in the early to mid 90's the Warp Drive 3 blade 62" prop was used on a VW conversion done by Bob Wilson for the Kitfox and Avid Flyer. Also Mosler was using them on some of their engines. Wilsons 2180cc conversion broke 3 stroker crankshafts in the 50 to 60 hour range, it was becoming predictable. Mosler had several failures also on both stroker cranks and stock VW crankshafts. One crank was sent to a metalurgy company in Texas for testing and confirmed what was thought.
The Warp Drive 62" 3 blade props weighed in at about 13 lbs and has no dampening effect. They simply overloaded the nose of the crankshaft ie twist and they broke. The one I saw started in the corner of the small keyway and worked around to meet up with the big keyway for the crank/cam gear. At the time, Warp Drive concured that their prop was not ideal for a VW conversion. Thats the history. Hard to beat a good wood prop with a urethane leading edge. Steve Bennett Great Plains Aircraft ifly...@msn.com
