Neither the KR-1 or KR-2 plans required heat treatment of the wing
attach fittings. They were made from 4130 chrome moly steel, Condition
N , per plans. I never heard of any normalized 4130 wing attach
fittings ever failing, and mine were made from Wicks Aircraft supply
Normalized condition, 4130 sheet steel. John Shaffer N455JS.
John Bouyea wrote:
"I seem to recall something about a series of defective WAFs supplied
by RR sometime in the past. Perhaps I’m not using the right key
words but I’m striking out in the KR Archives."
That's true. I was told that they were recalled because a required
heat treatment wasn't done on the batch in question.
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