On Mar 25, 12:33 pm, wrote:
On Mar 25, 6:16 am, "Ian Strachan" wrote:

...there is no problem with the cockpit
noise signatures of MGs powered by internal combustion engines
whether they be four-stroke, two-stroke or Wankel (rotary).

That is, other than hearing-loss ;-)

True. Myself, I (almost) always wear a headset when running a Motor
Glider engine in the air.

In the UK Air Force there was a syndrome called "Shackleton Ear" which
was permanent deafness on certain frequencies. The Shack had four
Griffon piston engines (a sort of "double Merlin") and flew maritime
patrol sorties many hours long. People who got "the ear" were
generally those who took off their headsets for long periods of time.

Ian Strachan
Lasham Gliding Centre, UK