Wow, this is really eye opening. I realize the SS7 was designed for heavy engines but using the Kitfox W&B example in the build manual. An 814# empty SS7 would have to have an empty C of G of 7.48" to get a 9.5" C of G with a 170# pilot and 3 gallons of fuel.

Is this even possible without adding ballast?

I am interest to see John Kuzmic's as he has a 914 and an airmaster prop. All heavier than a ULS and a ground adjustable. Plus he has a nose wheel. Not sure how much of a difference that makes since the tail wheel has such a long arm.