RE: Ultrastick 40 questions
These are the modifications I made to My US40
Reinforce the firewall with 3/8" triangle stock
Pin the firewall - personal preference
Reinforce the landing gear plate
Reinforce all sides of the servo tray with triangle stock
Reinforce the ply plate where the wing dowels go into
Fuel proof the fuel compartment and the bottom of the equipment bay
Add a third screw to the landing gear to create a triangle pattern
Replace the tailwheel with a Sullivan tailwheel unit
Install blind nuts for Sullivan tailwheel prior to starting tail assembly
Replace Hanger 9 11oz. Fuel tank with a Sullivan FRST 12oz. Flex tank
Replace the motor mount with a Dave Brown or similar motor mount
Install a small piece of 1/32” ply inside on the left fuselage side where the switch mounts
Pin the stabilizer - personal preference