I did hear of an accident in the RAF where a Whirlwind or Wessex, on start up for an engine test or some other similar low risk task, developed such triffic ground resonance that it shook itself to bits, before even getting airborne.
The reporter got clocked on the back fo the head with a bit of blade, and mentioned that if he hadn't had his bone dome on he wouldn't have been writing the article.
That said, I don't wear one, but I guess in a Robbo you pays your money and takes your choice . . .
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I got bored with "WhoNeedsRunways"