Tricycle landing gear (required changes to fuselage and motor mount)
Full span flaperons
Modified fin and rudder (mostly shape).
I finished my "Tailwind" in 1963 in a blue color scheme and had it registered as Tileston Drag'N'Fly, with the c/n JET 101. Later modifications were:
Repainted in yellow
Cross over exhaust
Ram air induction (ala Mooney)
These changes increased the speed about 20 mph (32 kmh)."