here be the rules for Sportsman Stunt Speed guy:
SPORTSMAN STUNT SPEED
This is a participation event created as an alternative to Fox 35 Stunt Speed which is an engine builders
event. The intent is to provide an event that can be flown with stock engines and existing airframes. As
such, contestants who have exceeded 90 MPH in Fox 35 Speed or who enter Fox 35 Steed at this
contest are excluded.
Airframes This event allows on sport planes with built up or foam airfoil wings and the general
configuration of a sport plane and are capable of doing basic aerobatics such as a lazy eight of reverse
wingover. The airplane must ROG from a fixed landing gear.
Engines - Only stock plain bearing baffled-piston engines of the nominal 35 size are allowed. Since
venture size data for the whole world of engines is unavailable, any fixed venturi is permitted. The
suction fuel requirement effectively limits choke area. All Johnson and Supertigre engines and Foxes
other than the 35 Stunt are excluded.
Lines and Laps.
Perky: .014 x 52-6 - 16 laps.
Sportsman Stunt Speed: .015 x 59-6 - 7 laps.
Fox 35: .016 x 60-0 - 14 laps.
Fuel 10% nitromethane with an assortment of oils; 29%, 23% and 20%