PPRuNe Forums - View Single Post - Robinson helicopters added to safety watchlist
Old 21st Nov 2016, 12:45
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John, that's the problem with generalised statements regarding helicopters - there is always one which doesn't follow the norm and something with a variable stabilator will inevitably behave differently to something with a simple fixed stab.

It's worth highlighting that designers make all sorts of adjustments to their control rigging to overcome these basic aerodynamic effects using mechanical (mixing unit) or electrical (AP computer) inputs.

Sikorsky made the starboard lateral control run slightly longer (using the mixing unit) to help compensate for tail rotor drift and roll on the Wessex and Sea King and the Lynx has a very strong collective to fore and aft pitch interlink to counter the 'flapback' effect of raising and lowering the collective.
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