thanks mr. mustang, Hobbie central sells a 17x4W and a 18x6W. I am going to try both of those. Another couple of questions. I saw some props on the vess website that were designated 18A, 18B, 19A, 19B so forth and so on. What does the A and B mean. I also lost the back half of my muffler on the 1.60 during flight. I have been flying without it. Other than no pressure for my fuel tank line is there any problems running like this????