Hi, I am building a 28% Staudacher from Bruce Lund plans. I have been flying and building for 30 years but have little gas experience. What engine would you recommend for a 80.5" aerobatic model. For me cost is a major factor so will be looking for the best value not necessarily the most powerful engine. At this time, 3D with an aircraft of this size does not interest me but I do like to have some verticle performance. I also realize a model of this size will be flown on the wing more than my 40's. What size and where should I look. Thanks, Dave