Originally Posted by
the Wasp
did you hear what they said in that video, for the War Birds, "to get more speed they went to a 3 blade prop, then to a 4 blade prop",, well my point is that all I have ever read on these forums is that the 3 and 4 blade prop are less efficient than a 2 blade is,, so could it be that even tho 3 blade props are less efficient they still pull more air ??
Jim
more than a few people have heard Denny Crane say that "it's Saito for him or it's nothing"
That, (less efficient) thing went out the window about 25 years ago, in the air the prop is moving forward into new undisturbed air and does not need to grab it, on the bench this is true though. As I've stated before I've been using 3 blades since I started rc. In comparing a 12 x 8 3 blade Graupner gray to a Graupner 12.5 x 7 3 blade gray the 12.5 x 7 turns 1,000 less rpm when powered by a Fox 74 Diesel conversion. The difference is 9,500 for the 12 x 8 and 8,500 for the 12.5 x 7. The blades on the 12,5 x 7 are not only longer but .125" wider, just one example of, I don't know what.