Recommended overhauls on constant-speed propellers are important. Here is a blade root that would not pass inspection due to scraping—most likely caused by improper lubrication or periods of inactivity.
In Case You Missed It
Wind Tunnel
The aerodynamics of an airplane sometimes don't cooperate with the pilots desire to roll, and instead produce both yaw and roll. Contributing factors are aileron parasite drag, induced drag between the wings and changes in the roll rate itself;
Spirit Engineering SE-1
I will admit to having a weak spot for polished aircraft, particularly vintage aircraft,...
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![Fuel Follies [Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/02/Fuel-Selector.jpg?w=218&h=150&crop=1)








![Spirit Engineering SE-1 The Spirit Engineering SE-1 gleaming in repose. [Credit: Andrew Robinson]](https://www.kitplanes.com/wp-content/uploads/2026/09/IMG_8605.jpg?w=324&h=160&crop=1)

If it’s on an amateur-built experimental (this is still Kitplanes, right?), by the FAA’s definition it’s not airworthy from the get-go.
Whether it’s in a condition for safe operation is a different matter altogether,
Ironically, we do give them an airworthiness certificate.
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