X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([204.127.217.106] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2642780 for flyrotary@lancaironline.net; Sat, 12 Jan 2008 22:12:24 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.217.106; envelope-from=keltro@att.net Received: from fwebmail13.isp.att.net ([207.115.9.153]) by isp.att.net (frfwmhc06) with SMTP id <20080113031146H0600cpjb4e>; Sun, 13 Jan 2008 03:11:46 +0000 X-Originating-IP: [207.115.9.153] Received: from [4.245.52.155] by fwebmail13.isp.att.net; Sun, 13 Jan 2008 03:11:46 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: Mark's HushPower 2 resonator Date: Sun, 13 Jan 2008 03:11:46 +0000 Message-Id: <011320080311.3843.47898171000A39B700000F0322218683269B0A02D29B9B0EBF019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_3843_1200193906_0" --NextPart_Webmail_9m3u9jl4l_3843_1200193906_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Mark, Looks good.......Where did you source the ball joint coupling ??.......And keep us up dated on whether the sweet tone is maintained if the packing material decides to depart !!............. -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from "Mark Steitle" : -------------- 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. --NextPart_Webmail_9m3u9jl4l_3843_1200193906_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Mark,

Looks good.......Where did you source the ball joint coupling ??.......And

keep us up dated on whether the sweet tone is maintained if the packing

material decides to depart !!.............

--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold

-------------- Original message from "Mark Steitle" <msteitle@gmail.com>: --------------

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.

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