The Acrosport II is a close cousin to the Pitts, Curtis Pitts and Paul (the ASII designer and founder of the EAA) were good friends and Curtis provided allot of design input. The build manual and plans contain the phrase "of Pitts design" in several places. The major difference is that aerobatic edge was traded for a more docile aircraft. The gear is lower and wider so it ground handles like a Citabria, in fact it flies allot more like a Citabria or a Decathlon than a Pitts S2. It is still a very aerobatic aircraft for sure, but you get the luxury of a stall at 55, best climb at 80, and an approach speed of 65~80, room for the pilots and some baggage etc. I had originally wanted to go with a converted subaru but ended up choosing an IO360 roller tappet for practical reasons.