|
Bill, I have two of the larger Hushpower II mufflers
(twice the length of the resonator). My turbo 13B block without a
turbocharger (and no exhaust splitters) is indeed the 13B with the steroid
pumped exhaust sound. It has been measure at 125DB (pre muffler) and it
may well have been higher - but that was the top of the meter's DB scale.
It was not loud, it was ear shattering!
However, the Renesis has a much less aggressive bark and
is therefore easier to quite. So a resonator alone may indeed be more
effective on the Renesis than the full muffler on my turbo block
13B.
Actually, mine would sound a bit less noisy with only 1
hushpowerII (due to the acoustical physics of sound dampening) - but it was
going to cost me over $400 to have my two-pipe header redone into a single
header enabling me to use one muffler. But at $100 each, two of the
mufflers were cheaper (if not lighter nor quite as effective), so I went that
route.
Ed
----- Original Message -----
Sent: Tuesday, January 08, 2008 8:38
PM
Subject: [FlyRotary] Re: Dennis'
Muffler
Has anybody weighed one of these resonators?
Ed, do you have one of these on your plane? Is
the difference in sound levels of yours and Dennis’ plane due to the
differences in the 13b and the Renesis?
Bill B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Tuesday, January 08, 2008 7:49
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dennis'
Muffler
No Packing, Kelly. Basically
concentric tubes with holes in them. It appears to use acoustical wave
damping as a primary sound suppression technique followed by damping from
the energy lost caused by the numerous holes. The HushPower
resonator is basically 1/2 of the regular HushPower II muffler (also 1/2
its length)
----- Original Message -----
Sent:
Tuesday, January 08, 2008 6:47 PM
Subject:
[FlyRotary] Re: Dennis' Muffler
Any info on what the packing is
in the "Hushpower"??
--
Kelly Troyer
"Dyke Delta"_13B
ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
--------------
Original message from "Mark Steitle" <msteitle@gmail.com>:
--------------
Bill,
Here is a cutaway of the Hushpower II
Resonator. I'll have to get the dimensions this weekend. The
dimensions you quoted are pretty close, but you may need a heat shield, or
some Zetex to protect the fiberglass.
Mark
|