KR design is in fact tough. back around 1990 I had a friend with a KR1 he built in the 1970s. After a repaint he didnt rebalance the control surfaces, and in a shallow dive pullout he hit about 220mph and then sudden flutter. Said the world was blurry it shook so bad. He chopped the power and let it bleed off. No damage. Thats rare, and impressive!
As I recall, the KR 1970's were spent trying to stop VW conversions from failing. Many broken cranks, and some other issues. RR provided a cool 3 blade composite ground adjustable prop, looked so cool on a little retractable. Until they started slinging blades. I guess thats why they call it experimental aviation. You learn a lot, challenge yourself, and its very satisfying. But despite best effort, sometimes stuff does break. That pdf is cool. On Tue, Dec 23, 2025 at 11:04 PM Adam Deem via KRnet <[email protected]> wrote: > The data shows that the largest category of EAB mechanical failures > leading to an accident were engine related and fuel system related. Auto > conversion engines had a higher failure rate than other 4-stroke engines. > > >
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