One of the guys at the airport had one on his Pazmany pl-2 (o 290g engine). The blade failed one day and he made a forced landing. They gave him new replacement blades. Another guy had one on his EAA biplane with no problems. Both of these were three bladed. I wouldn't use on on a VW. The crankshaft isn't strong enough for the prop. It might be OK on a Revmaster but not on a stock VW crankshaft. Another guy had a five bladed version on his Coot amphibian with a Mazda 12-A using a 2:1 reduction with no problems.
Joe Scappoose, Ore. BTW; I have heard it said quite a number of times that carbon fiber props should not be used on VW engines. I do not know if this applies to Revmasters and/or if anyone has actually studied this problem or it is just an old wives tale (I suspect the latter). I do not wish to spread rumors, neither do I care to read you had a crank break and destroyed your plane. Steve Bennett can probably clear this up in short order. Jon Finley N314JF - Q2 - Subaru EJ-22 [http://www.finleyweb.net/Q2Subaru.aspx] http://www.finleyweb.net/Q2Subaru.aspx