OK - I was wrong, it does appear possible to use a boom mic with a petrol
engine (Wankel?)! But I thought the idea of this thread was to gather
useful advice on new installations and switching mics. In general I hear
that vibration causes a lot of problems, so although a boom mic may work OK
it seems sensible not to advise its use with the engine on. Further, there
are alternatives to the traditional dynamic boom mic for gliders (not
supported by some radios) that may usefully be considered and preferred by
some.


At 21:19 26 April 2014, Eric Greenwell wrote:
Bryan Searle wrote, On 4/26/2014 12:56 AM:
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. The use of ear-buds is a great idea, but the
cost
is somewhat eye-watering! I just use the cheapest Ebay aviation headset
which will collapse to a reasonable size, unlike the premium headsets.
Anyway, its is very difficult to converse with a self-launching 2
stroke
at
+6000rpm just behind your head, however much you pay for a
headset/whatever.

Vibration? What's that? I've used a boom microphone in my ASH 26 E for
19 years with no problems or complaints. I've used the cheapest ANR
headphones I could find in 1998, and they've worked fine, also, though
the sound reduction is quite acceptable even when the ANR is turned off.

I use the boom mike with a foam "muff" cover, and speak with my lips
touching the foam. I don't think a boom mike would work well in a noisy
cockpit if it's away from your lips.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm
http://tinyurl.com/yb3xywl