Again, Allison 1710
How about the radial engine BII La...ling used Pratt and Whitney on some versions!
What's wrong here?
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And yep, that many Merlins in full song overhead. "If erection lasts longer than four hours..."
Another oddball - the CAC Boomerang:
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Three flyable examples remain, in Australia, naturally:
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More here:
https://en.wikipedia.org/wiki/CAC_Boomerang