Bryan Searle wrote:
There is no way that you can use a boom mic with a petrol engine! The
vibration will couple directly through the fuselage attached boom and
produces a huge signal.

Before claiming something won't work you might actually want to check in
with all the folks who manage to do exactly what you are claiming will not
work. And as fun as it might be to think Dave might be wrong about
something he already offered an existence proof that it does work/is being
used. So he's wrong and a liar?

Microphones in motorgliders can be problematic with engine noise, ignition
pickup, increased need for proper microphone technique, etc. But any
blanket claim that a gooseneck microphone cannot work is just plain wrong.

A good quality canceling headset mic may be best but many motorglider
pilots are able to use the factory installed gooseneck mounted microphones
just fine. Dave was talking about a different pilot in an ASH-26E, but my
ASH-26E gooseneck mic is very usable when under power if it is properly
positioned near the mouth.

Darryl