Tom,
If you're running a turbo you shouldn't need a muffler. The turbo serves the purpose of the muffler.
Mark
On Wed, Apr 20, 2011 at 11:37 AM, Thomas Giddings <tom@midwestaviation.net> wrote:
Would a turbo charged application be less of problem with a muffler?
Tom Giddings
VP Avionics Sales
On Apr 20, 2011, at 12:25 PM, Steve Thomas wrote:
Al,
I'd love to have a good tangential solution. Mistral had developed one before they declared bankruptcy. But, their engineer told me that they were loosing at least 5 HP with it. So, if I am ignorant, I am happy to be corrected.
I presume that you have shared your design before? Can I find in in the archives? I am not a welder, so I have to hire any welding that needs to be done, so the cost of an Inconel device will be quite pricy, I presume.
Burns Stainless wrote back to me and wants me to send the failed muffler to them for analyses. Should be interesting.
Best Regards,
Steve Thomas
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On Apr 20, 2011, at 9:51 AM, Al Gietzen wrote:
Steve wrote:
3. At 50% power, my fuel flow is 11 GPH rich and 9GPH lean.
This doesn’t seem right – at 50% power my 20B will run 9-10 gph leaned.
The tangential style mufflers are too power-robbing
My 20B got 265 hp at 6300 rpm on the dyno with the tangential muffler and secondary resonator. With 9.0 : 1 rotors and normally aspirated that’s not all bad.
But perhaps more importantly I now have 213 hour on the inconel tangential and 321 SS secondary; and they are still in good condition. And it is reasonably quiet.
Al G
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