"Bass, Jerry" wrote:

I have run my Fishmouth extensions on high speed taxi and like them.  Each
extension is 4.5 inches long from a 2" dia pipe.  I wired the mouth shut,
down to 1/4 inch.  and ran the engine at 5000 rpm on three runs, with and
without the extensions.         The extensions quiet the roar some, but do
not have a sound meter.
J.Bass

P.S., I have a Bose Series II headset to sell or buy. $700  I eventually will
need two for this noisy craft.

Here is a picture from the Aus Aviation Museum in Nowra of the fish tails
on a RR Merlin.

Paul Lamar

 
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