It sounds like the range on the plans is correct then. The plans say 110 to 120mm. Thanks for the answers all. I split the difference and put it at 115 dry with fuel in it, it is at 108mm. Mine is evaluation 26 gas powered. With how I mounted the landing gear the center of the axels are at 30mm when extended. Taxie test today. I hope I do not have to much of a nose over problem. If so this will not be the first one I have had to deal with that problem. My spitfire is the worst when full of fuel.