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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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