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Bob, I have a friend (not on the list) who tried them with
a 13B on his GlasStar and his opinion was that they did not stand up to the
rotary exhaust pounding and did not reduce the noise sufficient to justify the
cost. He now flies with a SpinTech
Ed
----- Original Message -----
Sent: Monday, January 14, 2008 3:20
PM
Subject: [FlyRotary] Re: Drips? was
[FlyRotary] Re: URL for HushPower
Has anyone tried a supertrap muffler? I ran them back in my
motorcycle racing days and was impressed with ther perfrmance and the hush
factor.
http://www.supertrapp.com/product_sections/detail.asp?CatID=32&ItemID=549-3019
Bob
Mears
Supermarine Spitfire
-----Original Message-----
From:
Ed Anderson <eanderson@carolina.rr.com>
To:
Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 14
Jan 2008 2:05 pm
Subject: [FlyRotary] Re: Drips? was [FlyRotary] Re: URL
for HushPower
Well, Mark, I tried that. Actually I tried both SS
pot scrubbers as well as SS machining shavings. They withstand the heat
with no problem, but the shock of the exhaust soon pound them into small
pieces that get blown out of the muffler. However, I did not tried
stuffing a HushPower II.
Ed
----- Original Message -----
Sent: Monday, January 14, 2008 10:54
AM
Subject: [FlyRotary] Re: Drips? was
[FlyRotary] Re: URL for HushPower
Sorry to say, but I agree. I'm thinking of stuffing my HP-2 with
SS shavings.
Mark
On 1/14/08, bmears9413@aol.com <bmears9413@aol.com> wrote:
Im
real worried about my noise factor. twelve pipes right in front of me. no
muffler. each 1 1/2" exhaust pipe actually has a 3/4 hole to exhaust out
of. im hoping that will quiet it a bit....but im pretty sure im full of
crap....its gonna be toooooo loud.
Bob
Mears
-----Original Message-----
From: Mark Steitle <msteitle@gmail.com>
To: Rotary
motors in aircraft < flyrotary@lancaironline.net>
Sent:
Mon, 14 Jan 2008 9:39 am
Subject: [FlyRotary] Re: Drips? was
[FlyRotary] Re: URL for HushPower
The problem with the auger muffler is that everyone said it sounded
like a flying weed-eater. It was sometimes described as a flying
chainsaw. Not the most flattering description. It wasn't
"that" loud, but you could definitely hear me coming from miles out.
Maybe that's a good thing?
I guess we'll soon find out what the HP-2 sounds like with
no packing.
Mark
On 1/14/08, bmears9413@aol.com < bmears9413@aol.com> wrote:
Mark,
I
thought your spiral muffler you built was quiet. Did it turn out to be
too loud after you got in the air? Or too much back pressure?
Bob Mears
-----Original Message-----
From: Mark
Steitle <msteitle@gmail.com>
To:
Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent:
Mon, 14 Jan 2008 9:12 am
Subject: [FlyRotary] Re: Drips? was
[FlyRotary] Re: URL for HushPower
Ed,
I don't think it was doing this until after shutdown. That
makes sense as all the heat builds with no airflow over the
muffler. It would probably be wise to put a SS heat shield between
the muffler and the fuselage floor. (I had a piece of Zetex
installed, but hadn't waited long enough for the RTV to cure and it
started coming off during flight. I will try a fresh piece, and
wait a little longer this time.
You're probably right on 1 though 4. I suspect the packing
material to be fiberglass. I doubt that ceramic would melt that
easily.
Mark
Packing, I don't need no stink'in packing!
On 1/14/08, Ed
Anderson <eanderson@carolina.rr.com
> wrote:
Hi Mark, interesting development. I
suspect several reasons you may be the only one to
notice.
1. It might be that the 3 rotor keeps the
average muffler heat level higher as you have (approx 1/3 more heat
energy with the third pulse during the same time
interval).
2. Your muffler is pretty close to the
exhaust port - less chance to lose heat before the
muffler
3. Your muffler is pointed down (mine and
I suspect most are more/less horizontal) and therefore provided an
easy path for the melted packing to drip down.
4. What does the packing seem like?
I would have expected glass or ceramic packing - but, a glass packing
would be the more likely of the two to melt.
If this is the insulation packing
and it goes, then the shell might get a bit hotter.
----- Original Message -----
Sent: Saturday, January 12,
2008 5:58 PM
Subject: [FlyRotary] Re: URL
for HushPower
For rotorheads that are contemplating using
(also the mildly curious) the Flowmaster HP-2 "resonator"
muffler,
I installed the HP-2 today on my 20B and was able to
do a run-up. Bobby Hughes and I both agree that the exhaust
tone is much, much mellower with a deeper tone. My Lighspeed
ANR headset had no problem cancelling out this low-frequency exhaust
tone. While the overall sound level was still pretty
significant, the exhaust tone was much more pleasant to the
ears. The ear-piercing, glass shattering,
nails-on-the-chalkboard, make-you-bleed-from-the-ears, exhaust tone
is totally tamed. The 3-blade M/T prop is the primary
noisemaker now. The test took place between two rows of
hangars, so I feel that DB readings are not very realistic.
I'll take those again out on the ramp and post the numbers. If
the HP-2 holds up to the pounding of the rotary's exhaust, I'll be a
very happy camper.
Mark S.
On Jan 12, 2008 3:22 PM, Ed Anderson < eanderson@carolina.rr.com>
wrote:
They are both used stock Rx-7 turbos.
one is the older model pre 89 and the second is a later
model 91 year. They both appear to be in working condition
in no nicks on the blades and they spin. I used compressed
air to spin the compressor wheels to they were really whizzing
along.
One came with my 91 turbo block and the
other was given to me.
Ed
-----
Original Message -----
Sent:
Saturday, January 12, 2008 3:46 PM
Subject:
[FlyRotary] Re: URL for HushPower
Well,
then we just have to keep on
looking for a "justification" for you/your area/etc.
:)
Just wait, I'll find something!
:)
Thomas
How about: "..... I
have two turbo sitting in my shop......."
...are
they new/used? What's the scoop on
them?
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