Thanks every body. I also have another question reference a different plane that I am putting together also for IMAC. It is an Aeroworks Extra 260 75cc. I may start a new thread on this to get more response, but I will post it here as well. Can I be competitive in the sportsman class with a 75cc size plane? I am in basic this year and am flying the Aeroworks 90-120 Yak, with a 73 inch wing span and a os 160 glow, and I have done well with it this year placing second in one of the contest I flew at, but know I need bigger for upper classes, but is 75cc big enough? It has a 96 inch wing span I believe and is a fairly large plane, considering that most 100cc planes I see have 104 inch wing spans, that is only 7 inches difference. I flew a 100cc in my last contest and won that contest so there is no doubt I can see the benefits of a bigger plane. It will be a long time before I can go any bigger than 33-35% and my 75cc is a 33% plane. Again be easy on me and thanks in advance.