It will be time to renew insurance and I would like to make a honest effort to find the net propshaft horse power loss of a scx and sc -2 lower in a 29 Fountain. I have enough props that I can use to get close on which prop family to use. I just have to use a net-power figure because I do not want to misrepresent the power or speed of the boat,but I do not want to pay for coverage that I don’t need.