Dave wrote:
:
:IIRC, There was a specific non-combat maneuver which, when removed from the
ilot's repertoire, cut the accident rate in half, for both models. It was
:called, among other names, "bow to the crowd". It was done in a hover, and
:was a tip the nose down and return maneuver that accentuated some instability
:in the hover, and caused several crashes over the years.
:

There were several flight regimes where overly-close tolerances
between the turbine blades would lead to a flameout of the engine.
When you only have one, that sort of sucks.

I'm only aware of one 'bow' crash and it didn't look like it was
caused by instability. It looked like an engine casualty, with a big
gout of flame and the aircraft shooting down into the water.

I have no idea if they still do this at air shows or not, but I
wouldn't be surprised if they do.

--
"Insisting on perfect safety is for people who don't have the balls to
live in the real world." -- Mary Shafer, NASA Dryden