X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ey0-f180.google.com ([209.85.215.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4591070 for flyrotary@lancaironline.net; Wed, 24 Nov 2010 14:10:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.215.180; envelope-from=msteitle@gmail.com Received: by eyf18 with SMTP id 18so42117eyf.25 for ; Wed, 24 Nov 2010 11:09:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=qoEWz+WxjAloBO5popFaOHPlcETIFjHuv8E+GhOum6w=; b=pE5zXpe1jIqb7p2i1Ru8NGZkMpUi5JbhhppHfQgfmUH2oakI3i50Zrho1JBQzgOweg gFcIPMmyYAk5MXGQ3oiPeSo8b1Dzdt0bFVp58MYJj1qy4jXoSWQkbxP18/YQxvlAGv0Y 48GnLExwu8+/X4EME6ReeywbHpru5+uH1cx7s= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=KAms5ySK/qBB5gvW3tFm4SMWdzaGi62Q4CsQKG/5xso9mHBGyd2polPy6oXKmONt2x kkSZY9JHhZrgLwB+5eZVzcLZr27IPS/xbssEChxiEO9D8He8Zjrtr6wgcuZNXjS1dkx6 fOJwWihtE+WsKltkQw6lTHVKypwe3EE8UdBuc= MIME-Version: 1.0 Received: by 10.213.9.140 with SMTP id l12mr4201414ebl.13.1290625766456; Wed, 24 Nov 2010 11:09:26 -0800 (PST) Received: by 10.213.34.212 with HTTP; Wed, 24 Nov 2010 11:09:26 -0800 (PST) In-Reply-To: References: Date: Wed, 24 Nov 2010 13:09:26 -0600 Message-ID: Subject: Re: [FlyRotary] Exhaust Cut-out was [FlyRotary] Re: Friends and Family.... From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015174c3fa858fcf60495d13a95 --0015174c3fa858fcf60495d13a95 Content-Type: text/plain; charset=ISO-8859-1 Ed, You ought to be ashamed to even suggest such a thing! I would have thought that an EE would come up with a more elaborate "electronic" solution, such as a noise amplitude attenuation/cancellation/suppression system (NAACS), sort of like a giant ANR headset that fits over the tailpipe. The whole system would consist of one IC and a big speaker. You could spend the next ten years developing it for TSO market. http://www.thedetroitbureau.com/2010/05/bmw-diesel-shows-electronic-noise-cancellation/ On second thought, a cutout would be a great solution, except that it kills power where you need it the most. I may have to add a turbo-charger just to quiet the savage beast! Mark On Wed, Nov 24, 2010 at 12:11 PM, Ed Anderson wrote: > Hi Mark, Chris and the rest - Happy Thanksgiving - except for scrooge > Chris of course {:>) > > Mark, been thinking about your exhaust conundrum - clearly the least > exhaust back pressure is best for performance out of your PP - however, as > you have indicated the Wail of an unmuffered 20B PP port might force you to > get towed to 10,000 MSL before turning on the engine to comply with noise > abatement rules. Not a very viable solution. > > Got me to thinking about a similar problem back in the Hot rod days. The > solution was the "cut-out" - simply a valve in the exhaust system that > diverted the exhaust through the muffler when the sound police were in near > vicinity - and then when all was safe (like Chris not being around {:>)), > the valve was switched to divert the exhaust down a straight pipe. > > I'm wonder whether that might not be a viable solution to having your cake > and eating it also? For most of us running stock or mild street ports - its > probably not worth the effort, but in you case it might be. > > Here is a URL to cut-outs both mechanically and electrically activated > > > http://www.jegs.com/c/Exhaust-Headers-Mufflers_Exhaust-Cutouts/11529/10002/-1 > > > Ed > > *From:* Mark Steitle > *Sent:* Wednesday, November 24, 2010 11:51 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: Friends and Family.... > > Chris, > > Well, you can always go out to the airport and polish your turbo while you > wait for your EC-2 to arrive. ;-) > > If weather permits (and I get caught up on the "honey-do's") I may venture > down your way this weekend. But before I fly again, I've got to get the > EGT's hooked up after changing exhaust system. No need for me to call, > you'll be able to hear me doing my runup at 50R. That will give you about a > 45 minute warning. Are you planning to be at the airport Saturday or > Sunday? > > Seriously, I'll call you in advance. How do I find your hangar once on the > ground? From the YouTube videos, it appears that you've got more hangers at > Ellington than Col. Sanders has chicken coops. I'll need a road map to find > your hangar. > > Mark > > > > On Wed, Nov 24, 2010 at 10:29 AM, Chris Barber wrote: > >> FINE, I guess it is obvious that a holiday that focuses on friends and >> family is more important than tending to your aviation project and posting >> your progress, discoveries and insight here. NO PROBLEM. We see where >> your loyalties lie and it is certainly NOT helping satisfy my 'fix" of >> rotary knowledge, otherwise the silence would not be as deafening as >> an un-muffled 20b at full song. >> >> Go ahead, eat your turkey, watch the Cowboys get beat, fall asleep with >> that evening cocktail dangling from your hand. I can wait....... I will be >> thinking of you all as I "serve and protect" while other officers, as well >> as all of you, enjoy the day with their families. I will be checking the >> list with disappointment as no new emails get posted. Heavy sigh. >> >> >> Oh, and Happy Thanksgiving. ;-) >> >> Chris Barber >> Houston >> > > --0015174c3fa858fcf60495d13a95 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ed,
=A0
You ought to be ashamed to even suggest such a thing!=A0 I would have = thought that an EE would come up with=A0a more elaborate "electronic&q= uot; solution, such as a noise amplitude=A0attenuation/cancellation/suppres= sion system=A0(NAACS), sort of like a giant ANR headset that fits over the = tailpipe.=A0=A0The whole system would consist of one IC and a big speaker.= =A0 You could spend the next ten years developing it for TSO market.
=A0
On second thought, a cutout would be a great solution, except that it = kills power where you need it the most.=A0 I may have to add a turbo-charge= r just to quiet the savage beast!
=A0
Mark

On Wed, Nov 24, 2010 at 12:11 PM, Ed Anderson <eanderson@= carolina.rr.com> wrote:
=A0Hi Mark, Chris and the rest - Happy Thanksgivi= ng - except for scrooge Chris of course {:>)
=A0
Mark, been thinking about your exhaust conundrum = - clearly the least exhaust back pressure is best for performance out of yo= ur PP - however, as you have indicated the Wail of an unmuffered 20B PP por= t=A0might=A0=A0force you to get towed to 10,000 MSL =A0before turning on th= e engine to comply with noise abatement rules.=A0 Not a very viable solutio= n.
=A0
Got me to thinking about a similar problem back i= n the Hot rod days.=A0 The solution was the "cut-out" - simply a = valve in the exhaust system that diverted the exhaust through the muffler w= hen the sound police were in near vicinity - and then when all was safe (li= ke Chris not being around {:>)), the valve was switched to divert the ex= haust down a straight pipe.
=A0
I'm wonder whether that might not be a viable= solution to having your cake and eating it also?=A0 For most of us running= stock or mild street ports - its probably not worth the effort, but in you= case it might be.=A0
=A0
Here is a URL to cut-outs both mechanically and e= lectrically activated
=A0
http://www.jegs.= com/c/Exhaust-Headers-Mufflers_Exhaust-Cutouts/11529/10002/-1
=A0
=A0
Ed

Sent: Wednesday, November 24, 2010 11:51 AM
Subject: [FlyRotary] Re: Friends and Family....

Chris,
=A0
Well, you can always go out to the airport and polish your turbo while= you wait for your EC-2 to arrive.=A0 ;-)
=A0
If weather permits (and I get caught up on the "honey-do's&qu= ot;) I may venture down your way this weekend.=A0 But before I fly again, I= 've got to get the EGT's hooked up after changing exhaust system.= =A0 No need=A0for me to call, you'll be able to hear me=A0doing my runu= p at 50R.=A0 That will give you about a 45 minute warning.=A0 Are you plann= ing to be=A0at the airport Saturday or Sunday?=A0=A0
=A0
Seriously, I'll call you in advance.=A0 How do I find your hangar = once on the ground?=A0 From the YouTube videos, it appears that you've = got more hangers at Ellington than Col. Sanders has chicken coops.=A0 I'= ;ll need a road map to find your hangar.
=A0
Mark
=A0
=A0=A0=A0

On Wed, Nov 24, 2010 at 10:29 AM, Chris Barber <= span dir=3D"ltr"><cbarber@texasattorney.net> wrote:
FINE, I guess it is obvious that a holiday that focuses on friends and= family is more important than tending to your aviation project and posting= your progress, discoveries and insight here.=A0 NO PROBLEM.=A0 We s= ee where your=A0loyalties lie and it is certainly NOT helping satisf= y my 'fix" of rotary knowledge, otherwise the silence would not be= as=A0deafening as an=A0un-muffled=A020b= at full song.
=A0
Go ahead, eat your turkey, watch the Cowboys get beat, fall asleep wit= h that evening cocktail dangling from your hand.=A0 I can wait.......=A0 I = will be thinking of you all as I "serve and protect" while other = officers, as well as all of you,=A0enjoy the day with their families.=A0 I = will be checking the list with=A0disappointment as no new emails get= posted.=A0 Heavy sigh.
=A0
=A0
Oh, and Happy Thanksgiving. ;-)
=A0
Chris Barber
Houston


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