From what I've read on this forum, keeping the Gee Bee as light as possible helps with the landings. Saito 170Radial has about the same power output as a Saito 120 or 125 4 stroke but with a lot more weight. I am hoping the Robostruts will compensate for this (although the struts add weight themselves as well). Using the 170R is not ideal if keeping the weight down on this plane is an emphasis. Regardless, I love the sound of the radial and will try it anyway. I WILL do everything else I can to reduce weight (especially in the battery department). I hope to fly the plane soon. The weather is getting colder up here and may not have a chance before spring.