I know this doesn't actually answer your question but I have a dust with a west 50 and a magnum with a west 50 although I have never clocked them the general opinion of everybody that has seen them is the magnum is faster. I don't use the 8x10 I like the 8 3/4 X 8 pylon props just because I feel safer with them, both of the engines tune on the ground almost exactly the same as my jett 50 fire and pipe with the same props. I have the jett 50 on a clipped dust but don't have much flight time on it yet so I really can't compare that one fairly. The jett and west are both awesome engines so I think it basically comes down to preference. I have a few other jetts and love them plus the customer service is way better and easier.