X-Virus-Scanned: clean according to Sophos on Logan.com From: "steve Izett" Received: from mail-pf0-f171.google.com ([209.85.192.171] verified) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9386967 for flyrotary@lancaironline.net; Fri, 20 Jan 2017 06:49:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.171; envelope-from=steveize@gmail.com Received: by mail-pf0-f171.google.com with SMTP id 189so22218367pfu.3 for ; Fri, 20 Jan 2017 03:49:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:mime-version:subject:date:references:to:in-reply-to:message-id; bh=uXQLwFMNQVfZO1d7XndneIR7XkWV20oVhHLAdZcPPmU=; b=g9fSG9fwmntbehtntewHlYY8wg6Rn4gQ4ENaVWdZy3ldyTabksfzu9BIbmkGbaUQFn NQjWs+HTgYKRyVmq8ndmTBSp78i+wF1pvk0H943UU7lC+EsNn744lksBrdUAD2UBnQjh 2uKrzPs7uyzyblUp4UDUB8bYN2HW5wkzXKavwGkIcvplExanNMvsMj2ZqVVEpCzy/YXw 2DfBHjQS+zQ6zS2XhEfj7CJA6qHURbNB07hu+30G18BDk3i1RI6YHjyDbgs9ci9AWMia r/bUIIcBo1GS46l/fnS4uAtBo3yI9v6LN0NH5VAd0VEpeQMtjo/eCNaHbRlHf6IAsa1F 6N0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:mime-version:subject:date:references:to :in-reply-to:message-id; bh=uXQLwFMNQVfZO1d7XndneIR7XkWV20oVhHLAdZcPPmU=; b=t4CVQnZ8mwA9lYK0uI7ZEKqsp8jxEiwQnJumfrxJBMzhO2kYNpgeWGLjIjcApcoCZS dP4n9rGLWuPnbsa51CBixaUkUsDq1gwgXTzBeLiYyim+4Y1sylfiwijtyY12Gq4+qH2H loCxLXYDHbdQAs80sofnxAa7GVqWO5JhaGLHX26lnWjSn/EsHA1+okm62OqcdAGqCckE mg72iVNnOIWgGuH+NOpj2A2loK8cs/cavhgCId8/xjsavHch9AVqd6THaYk7pQzvsuXw i83ppVULtnQMKc4AtZrCtp64D9hkfPjdNXFn9BUkCfSBl313j5wRdzCTV7BjcoMh/mmC W5Wg== X-Gm-Message-State: AIkVDXIyyNF29Lee8w00PX3QJM+vJFf+XR+t0B7xMuyYcIPN5mVM270OrGQPWhOjBWad4g== X-Received: by 10.84.233.136 with SMTP id l8mr21307901plk.169.1484912944087; Fri, 20 Jan 2017 03:49:04 -0800 (PST) Return-Path: Received: from [10.1.1.6] (124-148-78-1.dyn.iinet.net.au. [124.148.78.1]) by smtp.gmail.com with ESMTPSA id 24sm16258443pfh.41.2017.01.20.03.49.01 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Jan 2017 03:49:02 -0800 (PST) Content-Type: multipart/alternative; boundary="Apple-Mail=_40D7A3B4-9B66-4989-9EEA-BC5FD9A59D83" Mime-Version: 1.0 (Mac OS X Mail 10.1 \(3251\)) Subject: Re: [FlyRotary] Muffler housing - something else I probably wouldn't do again Date: Fri, 20 Jan 2017 19:48:58 +0800 References: To: Rotary motors in aircraft In-Reply-To: Message-Id: <088E785E-B864-4A4C-9366-0253E719D353@gmail.com> X-Mailer: Apple Mail (2.3251) --Apple-Mail=_40D7A3B4-9B66-4989-9EEA-BC5FD9A59D83 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Thanks heaps for the story and photos Todd. I contemplated t=C3=BAnnels in the Glasair Super IIRG but retractable = nose meant an external ridge either side.=20 Being glass I felt I wouldn=E2=80=99t be able to tame the heat. Much appreciated hearing your journey. I=E2=80=99m really close to flying, but hey what people said was so = true!=20 A little bit of tidying up some wiring and programming some of my own = gear and should be off. Steve Izett Perth Western Australia > On 20 Jan. 2017, at 4:27 pm, Todd Bartrim = wrote: >=20 > I'm on a bit of a roll here so I might as well cover this one too. = This is more for your entertainment pleasure because I'd be surprised if = anybody else would even consider this... > =20 > Back when I began to build and had decided to use the rotary even = though I had never even had a ride in an RX7 (still haven't), but of = course I'd heard all about the terrible bark of the rotary. That didn't = dissuade me at all because as I pointed out, all aircraft engines were = loud.=20 > I was actually surprised by the arrogance of pilots. Whenever I = mentioned mufflers, they would start talking about noise-cancelling = headsets, because hey it's all about him, screw the people on the ground = below, you know the people that fight to have airports shut down because = of the noise. The same people that bought land by the airport because it = was cheap, but that's another topic for some other forum. > So I was still determined to use a muffler and at the time Tracy = was experimenting with mufflers. The leading contender at that time = seemed to be the SpinTech, but it was also quite draggy, which Tracey = did not like, being an efficiency freak that he is. So after many hours = of consideration (and probably a few beers), the half-baked idea of an = enclosed muffler housing within the fuselage was born! > There was many considerations involving structural integrity that I = had to address, but the biggest obstacles were weight and loss of leg = room. The leg room I justified by looking at so many high end sports = cars that had no more room than I'd have. It turns out to be just fine = for me. Heat was another consideration so the housing was made from .018 = 316 SS. I can't remember exactly but I believe it came in under 5lbs = complete. I know I have it logged somewhere. The back of it has a curved = double wall to add extra heat protection to that area of the wing spar. = The cockpit side of the housing had a firewall blanket insulation over = it, but it still kept my toes warm! It also provided extra exit area for = cowl air through a series of louvers I cut into the bottom skin cover. > I made my own version of a SpinTech muffler as money was getting = tight as I neared completion. This worked reasonably well and survived = for over 100 hours of running with 50 of those in the air. It still = looks fine, but Tracey's success with the Aero exhaust convinced me to = buy one of those for this rebuild. This fits nicely inside my housing, = but being more aerodynamic it would have been ok outside under the belly = as well.=20 > Now this whole half-baked idea actually works pretty well and while = I'm not sorry that I did it, I likely wouldn't do it again, but since = it's there I'm still using it to full advantage. If I didn't then I'd = turn it into a bomb bay :-).Ha! > Pics for this are at the bottom half of this page of exhaust pics. >=20 > https://goo.gl/photos/NvD5YH4jwbktESi88 = >=20 > Next post I'll cover my efforts to duct all the exit air from the = rads. This was advice that Ed Anderson used to expound on all of us. = Wish I'd paid more attention back then as it would have been a better = use of my time than the muffler housing. (Still listening Ed?) >=20 > Todd Bartrim >=20 > C-FSTB > RV9 13Bturbo --Apple-Mail=_40D7A3B4-9B66-4989-9EEA-BC5FD9A59D83 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Thanks heaps for the story and photos Todd.
I = contemplated t=C3=BAnnels in the Glasair Super IIRG but retractable nose = meant an external ridge either side. 
Being = glass I felt I wouldn=E2=80=99t be able to tame the heat.
Much appreciated hearing your journey.
I=E2=80=99m really close to flying, but hey what people said = was so true! 
A little bit of tidying up some = wiring and programming some of my own gear and should be off.

Steve Izett
Perth Western Australia




On 20 Jan. 2017, at 4:27 pm, = Todd Bartrim <flyrotary@lancaironline.net> wrote:

I'm on a bit of a roll here so I might as = well cover this one too. This is more for your entertainment pleasure = because I'd be surprised if anybody else would even consider = this...
   
Back = when I began to build and had decided to use the rotary even though I = had never even had a ride in an RX7 (still haven't), but of course I'd = heard all about the terrible bark of the rotary. That didn't dissuade me = at all because as I pointed out, all aircraft engines were = loud. 
  I was actually surprised by the = arrogance of pilots. Whenever I mentioned mufflers, they would start = talking about noise-cancelling headsets, because hey it's all about him, = screw the people on the ground below, you know the people that fight to = have airports shut down because of the noise. The same people that = bought land by the airport because it was cheap, but that's another = topic for some other forum.
   So I was = still determined to use a muffler and at the time Tracy was = experimenting with mufflers. The leading contender at that time seemed = to be the SpinTech, but it was also quite draggy, which Tracey did not = like, being an efficiency freak that he is. So after many hours of = consideration (and probably a few beers), the half-baked idea of an = enclosed muffler housing within the fuselage was born!
   There was many considerations involving = structural integrity that I had to address, but the biggest obstacles = were weight and loss of leg room. The leg room I justified by looking at = so many high end sports cars that had no more room than I'd have. It = turns out to be just fine for me. Heat was another consideration so the = housing was made from .018 316 SS. I can't remember exactly but I = believe it came in under 5lbs complete. I know I have it logged = somewhere. The back of it has a curved double wall to add extra heat = protection to that area of the wing spar. The cockpit side of the = housing had a firewall blanket insulation over it, but it still kept my = toes warm! It also provided extra exit area for cowl air through a = series of louvers I cut into the bottom skin cover.
   I made my own version of a SpinTech muffler as = money was getting tight as I neared completion. This worked reasonably = well and survived for over 100 hours of running with 50 of those in the = air. It still looks fine, but Tracey's success with the Aero exhaust = convinced me to buy one of those for this rebuild. This fits nicely = inside my housing, but being more aerodynamic it would have been ok = outside under the belly as well. 
  Now = this whole half-baked idea actually works pretty well and while I'm not = sorry that I did it, I likely wouldn't do it again, but since it's there = I'm still using it to full advantage. If I didn't then I'd turn it into = a bomb bay :-).Ha!
 Pics for this are at the = bottom half of this page of exhaust pics.

https://goo.gl/photos/NvD5YH4jwbktESi88

Next= post I'll cover my efforts to duct all the exit air from the rads. This = was advice that Ed Anderson used to expound on all of us. Wish I'd paid = more attention back then as it would have been a better use of my time = than the muffler housing. (Still listening Ed?)

Todd Bartrim

C-FSTB
RV9 = 13Bturbo

= --Apple-Mail=_40D7A3B4-9B66-4989-9EEA-BC5FD9A59D83--