You'd think that after two years of college aerodynamics, forty years of flying and five years of rotary, I might have got it right, but nooooooo.
I assembled one of those Christmas pyramids with candles that turn a fan which turns a roundabout with santa and angels on it.
AND IT WENT BACKWARDS.
Bu***er, humbug etc etc.
And a very Merry Christmas to all rotorheads out there!