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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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