What size and types of props do you have on that Carrera? I have the same one with 21.5x16 3 blade Suzuki props. Used to do that same speed and now after I got them reconditioned they are only doing about 35MPH and 5600 RPM. I was told to take them back to get them repitched and couped? Does that make sense? I'm thinking just getting new props but not sure if to get the same ones.