In need of a muffler for my TD .049

Mark,

If you have a non SPI cylinder set you can put that in place of the TD one. Then your muffler won't kill the performance. You will lose some performance due to not having a TD cylinder,but not enough to make it unflyable.

Are you looking for a throttled muffler or just a muffler? Yes, you will loose power and the head will be much hotter.

I'm surprised they are too loud.  When we flew the Quick-Stick yesterday, I thought it was quiet compared to some of Jeremy's electric pusher designs.

Ya, a muffler will do it.

These mufflers should fit:

http://coxengines.ca/cox-.049-muffler.html

and are scaleable to achieve the desired noise / power balance.

Hurry Quick!!!!!
http://www.ebay.com/itm/VINTAGE-COX-049-GTP-Car-Boat-RC-HEAT-SINK-Throttle-Muffler-/171060246513?pt=US_Radio_Control_Control_Line&hash=item27d3fc37f1

Interesting! There is written, that the COX GTP Nissan has a Kyosho Chassis. I know that Cox and Kyosho had many joint ventures, but I allways thought the GTP Nissan is own development by Cox?

If you can measure sound at home experiment with several different props to find the ONE that drops dB into a acceptable range when engine is at Max RPM. When you are getting tested at the field use that propeller. After you are accepted, use any prop you want, no one outside the circle can tell the difference

A LOT of the sound is from the propeller.....wink.... In my case (we have exact same field test and standards) a 5"x 3P leaned out TD .051 was too loud at 101 dB but a 6"x 4P (slightly rich, wink) was under at 95 dB

I am surprised the electric ducted fan and fun jet pushers screaming at 30,000~40,000 + RPM are able to pass the dB test at the field

I know I know I am advocating cheating the rule.....

I justify it in my case because the electrics also dominate our club field, they are intolerant of Glow engines and I never see a guy bragging about his nearing 200MPH FunJet tached up to 48,000 RPM get accosted by the field marshal for noise violation

The other thing that annoys me is our field is way out in the country, no houses within 2 miles, and the C/L temporary circle I eeked out of the property is 700 feet away from their runway and pilots boxes and 1000 feet from the spectator observation safety line.... What I am saying is, I could run my Rossi .45 with tuned pipe wide open (probably an easy 125dB) way over where I am and NOT bother a soul but the gliding Buzzards overhead