So That Was What It Was!

Update: Well here is my final view and answer on this subject. On Thursday 8th I did a quick noise test with the help of Simon with the GP original "muffler" fitted. Taken at ground level at a distance of 7 metres at WOT = RPM 7650. Prop Falcon 20x8 Front 94db, Sides 90 db, From Behind 86 db. The "bark" from the exhaust at any thing above half throttle is not nice. So, I have decided that at the moment the Extra is NOT flyable. If the OS exhaust is fitted I lose 1000rpm and max out at 6600. An option is to try a 22x10 prop but that might be just too much load, moving in to the 50cc domain here I think. I don't know which way to go for now.

Tuned pipe :woohoo:

You said you got the OS exhaust from BMFA, was it new or second hand??

If it was second hand there is a possibility that it is clogged up

Phil - General opinion from the pits area confirms your test results.
PLANE TOO NOISY.
Regards
Colin.

Chris Hughes wrote: You said you got the OS exhaust from BMFA, was it new or second hand??

If it was second hand there is a possibility that it is clogged up

Brand new in box Chris.

Phillip Ford wrote:

Chris Hughes wrote: You said you got the OS exhaust from BMFA, was it new or second hand??

If it was second hand there is a possibility that it is clogged up

Brand new in box Chris.

Did you take it out of the box before fitting it Phil ?