Gentlemen, How does one determine the percentage of size increase in a plane for a modification? I have a GP U Can Do .60 I like this plane but would like a gas engine. I know of one guy that did a weight reduction mod on a G23 and flys this model. To me it seems like too much weight up front even though it does fly at the resulting in a heavier model which changes the light 3D features. This is the plane I like so it seems that this is the plan for a scratch build. Right now with a Saito 100 it carries just under 21 oz. up front. I would like to know what the percentage increase in size would be required to carry an engine of app. 46 oz. and I'm sure you would have to consider the weight of additional support equippment that gas requires as well. Is this a practical approach or are there other aspects in design to consider? If it is as simple as just increasing the size of the design as is I would like to pursue it. I greatly appreciate any feedback on this. Joe