Originally Posted by
iwfudia
Also while on the Lazair, What was the purpose of having 2 props per motor? i could understand if they were 90o offset but they are behind the other. would it change much of the characteristics if they were 90o offset instead?
The reason for the double props on the Lazair was one of economics. The original Lazair was powered with twin 5.5hp chainsaw motors swinging a single prop each. The propellers had to be custom made and they had to order a large quality. When the engines were upgraded to the 9.5hp Rotax 185s, they still had a bunch of props left over, so rather than order new props they just put 2 on each each and it actually works very well.
I bought a Lazair last year and I'm thinking of putting a couple of DA 150s on it.
Ian