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Dave, as long as you are experimenting, cut 1/3 of
the length and see what the results are. I sent in my paper work today to
the DAR, so I'm getting close to blowing the guts out of the Hushpower II.
JohnD
----- Original Message -----
Sent: Friday, September 11, 2009 8:50
PM
Subject: [FlyRotary] Moroso Spiral
Muffler final report
I was pretty happy with the Moroso muffer at first. Only
3 lbs, sleek, sturdy, good looking, and toned things down perfectly. But
because I never really rage around at full power, I didn't realize how much
power it was costing me. Coming home from Vans homecoming I flew with a
couple guys with 180hp c/s props and was sad to discover that I just couldnt
keep up... gadas! I fugured it might be the new muffler, so I did a
couple of test runs at WOT (number from my guages - a little faster than
actual):
moroso
spiral
No Muffler Fuel flow matched
(throttled back some)
D
Alt
9200
9400
9400
IAS
148kts
159kts
151kts
TAS
168kts
183kts
172kts
RPM
5600
5950
5700
MP
27.2
30.3
26.9
Fuel Flow
12gph
15.5gph
12gph
Obviously, that muffler will fly never again. Sure is good to
have my power back. Maybe the hollowed out flowmaster will be back some
day... But it is kinda heavy...
Note, I am still a little slower
than with the wastegate closed and 2-bladed prop... but close
enough.
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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