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 -----

From: Mark Steitle

To: Rotary motors in aircraft

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 -----

From: Thomas Jakits

To: Rotary motors in aircraft

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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