X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omr-d01.mx.aol.com ([205.188.252.208] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6692846 for flyrotary@lancaironline.net; Sat, 18 Jan 2014 14:11:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.252.208; envelope-from=shipchief@aol.com Received: from mtaomg-mbb02.mx.aol.com (mtaomg-mbb02.mx.aol.com [172.26.254.112]) by omr-d01.mx.aol.com (Outbound Mail Relay) with ESMTP id 42452700000BD for ; Sat, 18 Jan 2014 14:10:51 -0500 (EST) Received: from core-dda001b.r1000.mail.aol.com (core-dda001.r1000.mail.aol.com [172.29.52.1]) by mtaomg-mbb02.mx.aol.com (OMAG/Core Interface) with ESMTP id E053438000082 for ; Sat, 18 Jan 2014 14:10:50 -0500 (EST) References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: muffler for Renesis? In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: shipchief@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8D0E29822E132C1_BBC_205F7_webmail-m228.sysops.aol.com" X-Mailer: AOL Webmail 38289-STANDARD Received: from 198.238.213.154 by webmail-m228.sysops.aol.com (64.12.107.162) with HTTP (WebMailUI); Sat, 18 Jan 2014 14:10:50 -0500 Message-Id: <8D0E29822DA0E9E-BBC-8AED@webmail-m228.sysops.aol.com> X-Originating-IP: [198.238.213.154] Date: Sat, 18 Jan 2014 14:10:50 -0500 (EST) x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1390072251; bh=4rIwym/ex7upCEjb+8Nuo6M4hcfCHUTCICrHDvkZzCY=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=FoPlRZgQr0UotQCrkdoaajs/7+Yp5sTIya2ok41aV4WNCc7IMMXlnHXNnLy6BQsM6 ZTrvTr2p8/nxjraV1/chao5VzGWCv2HeN8SISugbK6he+tcCk9T/ITI8UhL0CdBdL3 AkTigi2VKIbs1DqEFMt863/ttzeVXwZicGxJPJkw= x-aol-sid: 3039ac1afe7052dad1ba3260 This is a multi-part message in MIME format. ----------MB_8D0E29822E132C1_BBC_205F7_webmail-m228.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" I'm running a turbo, and it's still pretty loud. After I take off and climb= out, I find myself reducing power to reduce the sound level.=20 It's pretty quiet at idle and during ground operations, but above 5000 RPM = which is above 34"Hg manifold pressure, it's too loud inside the cockpit fo= r me. My TO4 turbine outlet faces aft into a reducer cone transition to a 2" pipe= . This pipe has two 90 degree bends and lets out parallel to the air exit r= amp on the bottom of the fuselage of my RV-8. I'm thinking the sound waves need to be directed away from the fuselage ski= n, so I ordered a slip on exhaust turndown tip (Walker 41420) and a lap joi= nt band clamp. Even with that, I would like to be a good neighbor. I'm planning to flatten= the turndown to a 1" rectangular outlet, and drill 18 ea 3/8" holes in the= down facing flat. Then use a 3/8" diameter rod to bend each hole into a sl= ightly rear facing shape. I believe the term is "Piccolo Pipe". I have a Hushpower muffler, which I bought after Tracy made his first repor= t on it. I just checked it out (box is pretty dusty, time must have slipped= by somehow?) That thing weighs alot. Also, the idea that the 'innards' mig= ht break loose and clog the outlet seems a bit scarey. The Aeroturbine would look better hanging under the fuselage tho- if I end = up needing a real muffler. (might need to clamp on 4 big fins at the back f= or aerodynamic guidance + asthetics?) -----Original Message----- From: Charlie England To: Rotary motors in aircraft Sent: Sat, Jan 18, 2014 9:23 am Subject: [FlyRotary] Re: muffler for Renesis? Thanks, Mark. I discovered that after I sent the previous message. Their=20 eb site seems to have a somewhat random 'organization'. Is the non-res model only 20" overall, as they describe? That would make=20 t only slightly longer than the H.P. resonator that Dennis is using, &=20 ince it appears to be only a perforated tube in the main cylinder, it=20 hould survive much better than anything with actual baffles and/or packing. Charlie On 1/18/2014 9:38 AM, Mark Steitle wrote: Charlie, They stock two types, one with packing, one without. The one with packing= is=20 heir "resonator"model, and it is longer than the non-res model. I bought t= he=20 on-res model as I figured the packing was only temporary. I have not insta= lled=20 t yet, so no flight report. Mark Sent from my iPad > On Jan 18, 2014, at 8:54 AM, Charlie England wrote= : > > Thanks, Tracy; it's good news that it is both quiet and survives. Didn't= =20 ealize that the aeroturbine had packing in it. If it performs as well as, o= r=20 etter than the hushpower, I may give it a shot. It's actually a bit cheaper= =20 han the h.p. resonator. > > Charlie > >> On 1/17/2014 10:53 AM, Tracy wrote: >> The aero turbine sounded better than the Hushpower II but both change i= n=20 one over time, probably due to packing deteriorating. Still, the AT was t= he=20 est after they stabilized. >> >> Tracy >> >> Sent from my iPad >> >>> On Jan 17, 2014, at 11:06, Charlie England wrote= : >>> >>> Time to order a muffler. My goal is to keep it inside the cowl (RV-7). = I=20 now, I know, but it looks better, and more important, it *sounds* better. >>> >>> I believe that Dennis H. used this: >>> http://www.summitracing.com/parts/hsh-12412400/overview/ >>> I know it sounds great. Dennis, do you remember the weight of just the= =20 esonator? >>> >>> I know that Tracy is running an Aeroturbine (weight: 6 lbs on the 20B i= n=20 he RV-8, & has talked about how good it sounds: >>> http://www.aeroexhaust.com/mufflers/aero-exhaust-at2525.html >>> >>> They are roughly the same size and price, so I'm wondering how the=20 eroturbine will compare in performance (meaning: killing the harsh harmonic= s of=20 he rotary). >>> >>> Tracy, you might be the only person who's heard both on a rotary. Based= on=20 our 20B experience, is it likely to work better than the Hushpower Resonato= r on=20 Renesis? I'll be using a manifold/transition pipe similar to Dennis' setup= to=20 eep everything inside the cowl. >>> >>> Thanks, >>> >>> Charlie >>> >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/L= ist.html >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Li= st.html > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html - omepage: http://www.flyrotary.com/ rchive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.h= tml ----------MB_8D0E29822E132C1_BBC_205F7_webmail-m228.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
I'm running a turbo, and it's still pretty loud. After I take off and = climb out, I find myself reducing power to reduce the sound level.
It's pretty quiet at idle and during ground operations, but above= 5000 RPM which is above 34"Hg manifold pressure, it's too loud inside the = cockpit for me.
My TO4 turbine outlet faces aft into a reducer cone transition to a 2"= pipe. This pipe has two 90 degree bends and lets out parallel to the air e= xit ramp on the bottom of the fuselage of my RV-8.
I'm thinking the sound waves need to be directed away from the fuselag= e skin, so I ordered a slip on exhaust turndown tip (Walker 41420) and a la= p joint band clamp.
Even with that, I would like to be a good neighbor. I'm planning to fl= atten the turndown to a 1" rectangular outlet, and drill 18 ea 3/8" holes i= n the down facing flat. Then use a 3/8" diameter rod to bend each hole into= a slightly rear facing shape.
I believe the term is "Piccolo Pipe".
I have a Hushpower muffler, which I bought after Tracy made his first repor= t on it. I just checked it out (box is pretty dusty, time must have slipped= by somehow?) That thing weighs alot. Also, the idea that the 'innards' mig= ht break loose and clog the outlet seems a bit scarey.
The Aeroturbine would look better hanging under the fuselage tho-= if I end up needing a real muffler. (might need to clamp on 4 big fins at = the back for aerodynamic guidance + asthetics?)
= -----Original Message-----
From: Charlie England <ceengland7@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sat, Jan 18, 2014 9:23 am
Subject: [FlyRotary] Re: muffler for Renesis?

Thanks=
, Mark. I discovered that after I sent the previous message. Their=20
web site seems to have a somewhat random 'organization'.

Is the non-res model only 20" overall, as they describe? That would make=20
it only slightly longer than the H.P. resonator that Dennis is using, &=
=20
since it appears to be only a perforated tube in the main cylinder, it=20
should survive much better than anything with actual baffles and/or packing=
.

Charlie

On 1/18/2014 9:38 AM, Mark Steitle wrote:
> Charlie,
> They stock two types, one with packing, one without.  The one with pac=
king is=20
their "resonator"model, and it is longer than the non-res model.  I bought =
the=20
non-res model as I figured the packing was only temporary.  I have not inst=
alled=20
it yet, so no flight report.
>
> Mark
>
> Sent from my iPad
>
>> On Jan 18, 2014, at 8:54 AM, Charlie England <ceengland7@gmail.com> wrote:
>>
>> Thanks, Tracy; it's good news that it is both quiet and survives. =
Didn't=20
realize that the aeroturbine had packing in it. If it performs as well as, =
or=20
better than the hushpower, I may give it a shot. It's actually a bit cheape=
r=20
than the h.p. resonator.
>>
>> Charlie
>>
>>> On 1/17/2014 10:53 AM, Tracy wrote:
>>> The aero turbine sounded better than the Hushpower II  but bot=
h change in=20
tone over time, probably due to packing deteriorating.   Still, the AT was =
the=20
best after they stabilized.
>>>
>>> Tracy
>>>
>>> Sent from my iPad
>>>
>>>> On Jan 17, 2014, at 11:06, Charlie England <ceengland7@gmail.com> wrote:
>>>>
>>>> Time to order a muffler. My goal is to keep it inside the =
cowl (RV-7). I=20
know, I know, but it looks better, and more important, it *sounds* better.
>>>>
>>>> I believe that Dennis H. used this:
>>>> http://www.summitracing.com/parts/hsh-12412400/o=
verview/
>>>> I know it sounds great. Dennis, do you remember the weight=
 of just the=20
resonator?
>>>>
>>>> I know that Tracy is running an Aeroturbine (weight: 6 lbs=
 on the 20B in=20
the RV-8, & has talked about how good it sounds:
>>>> http://www.aeroexhaust.com/mufflers/aero-exh=
aust-at2525.html
>>>>
>>>> They are roughly the same size and price, so I'm wondering=
 how the=20
Aeroturbine will compare in performance (meaning: killing the harsh harmoni=
cs of=20
the rotary).
>>>>
>>>> Tracy, you might be the only person who's heard both on a =
rotary. Based on=20
your 20B experience, is it likely to work better than the Hushpower Resonat=
or on=20
a Renesis? I'll be using a manifold/transition pipe similar to Dennis' setu=
p to=20
keep everything inside the cowl.
>>>>
>>>> Thanks,
>>>>
>>>> Charlie
>>>>
>>>>
>>>>
>>>> --
>>>> Homepage:  http://www.flyrotary.com/
>>>> Archive and UnSub:   http://mail.lancaironline=
.net:81/lists/flyrotary/List.html
>>> --
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:   http://mail.lancaironline.net=
:81/lists/flyrotary/List.html
>>
>> --
>> Homepage:  h=
ttp://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net:81/=
lists/flyrotary/List.html
> --
> Homepage:  http:=
//www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/list=
s/flyrotary/List.html


--
Homepage:  http://www=
.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/fly=
rotary/List.html
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