That's a tough one Doc. Often times something small is stuck under the O-ring and draining a little will flush it out. Other times it has to come out...
The wings for a J-3 from inner spar fitting to the tip bow is a couple inches under 18 ft. The fuselage minus eng. mount and rudder is a fraction of...
An STC is an approval for a major alteration and major alterations requires a 337. If an item is a minor alteration it does not require an STC and a...
I am at 2 yrs now with the Whirlwind and Sensenich composite props. Love them both. The sensenich is easier to change pitch, but both work very well....
I have done just one and did it in that manner. Not a big deal just think it out ahead of time and move carefully. Took a few hrs, but could be done...