X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=eMxtc0h1 c=1 sm=1 tr=0 a=m1D5zTo5XZ0ftBpGyMcvgg==:117 a=vGeVQGUCm4oA:10 a=x7bEGLp0ZPQA:10 a=Fee85h93u3AA:10 a=reM5J-MqmosA:10 a=ZPv60q_EFhsA:10 a=Ia-xEzejAAAA:8 a=UKPAHat8AAAA:8 a=K9YiWmrbAAAA:8 a=W-IJHtK-AAAA:8 a=5lucXWJGAAAA:8 a=xPyZ54XvAAAA:8 a=pGLkceISAAAA:8 a=jV3BzgDzAAAA:8 a=o1OHuDzbAAAA:8 a=7g1VtSJxAAAA:8 a=pxClZ8UQvWaUsKGoF74A:9 a=nuUUIHVS_6Qt98H8:21 a=5ttFJCte4XpEjTWA:21 a=QEXdDO2ut3YA:10 a=KGhxpC5zL1cA:10 a=Qa1je4BO31QA:10 a=lbVkQV85mo0A:10 a=F6a2BMeBdsAA:10 a=gvSQh4r-fQ0A:10 a=S0wkRrzPavQA:10 a=jThZ7_-JAAAA:8 a=84IPtg0c2PHI0p0B:21 a=_Gn7gUsuhaiTS_IJ:21 a=smNO3q7nEUBiBo0R:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=Fc6xXSS-RxGHxrvp76Qp:22 a=4fN42X7Z35HiWFx1RDDL:22 a=PjCiafSWRo16AjQHjZXP:22 a=tjNemD4wtFR24VrVMQME:22 a=LQCduUwlY3eUW_MavTj7:22 a=9Uz93n4haClHrRxSevy5:22 a=5YQ6H4ZxyGn-KoBYtt8s:22 a=grOzbf7U_OpcSX4AJOnl:22 a=NVbvhy2gKIdozzgvQOKv:22 From: "lehanover lehanover@aol.com" Received: from sonic316-13.consmr.mail.bf2.yahoo.com ([74.6.130.123] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 797953 for flyrotary@lancaironline.net; Wed, 30 Sep 2020 05:38:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.6.130.123; envelope-from=lehanover@aol.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aol.com; s=a2048; t=1601458685; bh=Y/T555FriZnKwmsYVhzNwO8x/G2sXB1iPuwOfyemikI=; h=Date:From:Reply-To:To:In-Reply-To:References:Subject:From:Subject; b=pm0a9gPFslA2VOtxHmbMGdWA4Th0gZnR1jz/4EMJzlOmBGVs00xJ5Rc7sP/HNoJ6TlShT5i54c3dw+CZal9GHzXkaYoJUtds3UTog6lbb5UFSN04mPOj/adXwn13qqQv3awQP/VmcMGxTA5paFYdikPLXxD+aq46563/BtFa7nqrtNlqF0vaJgSlMTRCW4h1domn2M5iA2Z+y+roEP4OHb7NEBBLhaNELTBQEp/AnyPewSDcsISjuxOX9sJBsK590CXUW1+T6geq1r5dVUI4MA7N0ZsTpoeTw+AYqB+9ExqcBKbu6V1e+9GT1lXUVyNTE/ZxChNClCFTCPhwy8pS9A== X-YMail-OSG: oo9NlbsVM1nZXD_ZqmpMgR8zZeFblUdhRw_WuJ3yyRb8iJjTziFVF7FI0upM3w0 nms7NfRMAtOSXYyecFQwgfpfvWhk.N.Qxm3uEs3gSxldjhNqAFx0oJPx8SfTxtmWskmAHvqX9RYK I9ISCjq.NPANg46W6G_BBn2_PjjyKxvA1Q5VfoCPj72z_w94B8rVXBCutoByFD5HAXQBnQg9ceYl BYLvtcmJhHsne2zdbund09BKWfPg4F28tXcTlHbLaiq.j9dh_Hg.h9XiWLL4.fsg1f8swXnKyHHH hpKJFrGmsI1sMvLFaB0oSTZjqf8S6bgjTe26MadYEFpXld.dOXA8uPwdHKf1It7IbfOaVMvY4cYj IR.9vEGkdonrgMtAV22pnP0P9Agxz7Yb5x3vd25E1AJSs7vbvZzUXsEL_OwTGBTl4gu3JRc.kzP2 2MNulxdWRdCo6qN2BlrVx.bXZ_eRs3RZjTQsqiKqV1rxIaQ.IHLaerljIYdeYqfDAkipsrS4sTlI 0V4L26lDGTKIOXi9rA6JFAeqphv9Pki1FWyZStt9DMZjrFg0uyStrb9oLccNF_VNyyEDZdLj9SkR faFAiBS.LQwYuQjQ_Y2Q1D7H0HpCmAWIVVjd5.M2JjW_BteUAT2rbIR5PorPGuRg4QY7VeZa.r.7 62uYphbCnslLdD2wqLNwt_5oUgEhh3vwsZqil6VHgFGldif4v8IbdE4mA5rz33aDYHMQMaPkCZMW FxB2naY4p.DwNAvogAUMNchccMJ7YGLOPj8XmlyP6fIJ_PQAL.F4UvlrZ0r6DT_LZbv1joJtEbvR MZrTbmM.2JoOM0uJ4fs8jZgwz0p3sooul3cZaSPtKBNANxoQjzMG3sS8mLWLChzjzZEO2bYzmCn2 l6kLJt1eCj9vJaKbfZkSVd0FEZwGWQA7JzIhLX1SKZF5Lp8KaLCoa85g8.8nm0PYXaAYWc1lVClh nIYch2NvbnfFD8Ri5pbERIHeVmd6pLWaeoFg7pZO0doD.gvJskbPYkAi0NIen6vE7YUN.Pnq297R vB87_p6qPKTXz089EXxfvYyLJQpfZP9lmqVGXrx78bRGNiM72x1Ir4Xqy.YPSt2y_u.8n3.8bSup zhWdlahavNhvMQi9JIcYhmR1rjFxB7h0jn3JUAil4eJiZrlDgYokDf7zof7bFBUZmutqDvWr1tCG qcOhLaL9zzicJNwqiL2owGYOwPw.FeFreKjrUbyj9fhj7gfltSdNv9aCOBE.xwJ9x5QyMlntxoV2 FimLCAbVmwMnsaRxzeKP54LDYpbAXiW4l8ufedGuNefrlwo4hUyWrdLEeTAT1MGOVdyz.RAJzIBB OEZVyvv36YjeOKDqs2nAAkaatBXrv04DOD5SaG7DVqX8_hmCIMYxC6wqTUqPfnAPou3EVOA8QcUn mGP8YU2CMZPTkY1FORr9L2MwX54NK0GZJ2WYlObqZmB9UQYxsxTQrQYMi2oXPRpJPj6aqHA-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic316.consmr.mail.bf2.yahoo.com with HTTP; Wed, 30 Sep 2020 09:38:05 +0000 Date: Wed, 30 Sep 2020 09:38:04 +0000 (UTC) Reply-To: lehanover To: flyrotary@lancaironline.net Message-ID: <627064853.193494.1601458684739@mail.yahoo.com> In-Reply-To: References: Subject: Re: [FlyRotary] Re: Mufflers MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_193493_291332681.1601458684732" X-Mailer: WebService/1.1.16718 aolloki unknown Content-Length: 40883 ------=_Part_193493_291332681.1601458684732 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Where in Florida? I live in Florida in the winter.=C2=A0 =C2=A0Lynn E. Hano= ver=C2=A0In a message dated 9/30/2020 12:48:34 AM Atlantic Standard Time, f= lyrotary@lancaironline.net writes:=C2=A0 I've been stuck in Canada far too long. Finally flying to Florida on Sat to= see my plane and start flying off the hours (trouble free I hope) my email is my name (without spaces) at normal gmail dot com. - Matt Boiteau On Tue, Sep 29, 2020 at 3:02 PM Bobby J. Hughes bhughes@qnsi.net wrote: Matt, =C2=A0 Did you make it back to Canada in time for the first snow? I would like to = discuss your MS install off list when you have time. =C2=A0 Bobby =C2=A0 =C2=A0 =C2=A0 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 Sent: Wednesday, July 08, 2020 7:10 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Mufflers =C2=A0 Sadly, by the time the welder and I finished, I only got about 2 hours on t= he plane before I had to pack up my winter trip. I was planning to go back = in March to FL (I live in Canada) to start flying off the 25 hours, but you= know how that all went. So I'm just sitting here waiting for the borders t= o open up and fly my plane! Early conclusion is it worked pretty darn good. I'd say I'm equivalent=C2= =A0to an IO-360, maybe a tad quieter. Also on ground testing only, I quickl= y mocked up a long tube under the plane with holes drilled in it (with the = end capped off), and it pretty much got rid of all the engine noise, only p= rop noise. Haven't flown with that yet. One thing I still want to do is tes= t the backpressure. Making sure the CAN has enough holes inside. The best price I found on 321 was from ProFabrication. I went with 2.75" 20= ga (0.035") on the downpipe & outlet. https://www.profabrication.com/index.php/products/straight-tubing/321-stain= less-steel.html I did use SPD Exhaust for the double slip joints at the primaries and downp= ipe. 2" 16ga (0.06") http://www.spdexhaust.com/pdfs/22-23_Tubing.pdf=C2=A0=C2=A0 For the CAN, McMasterCarr 24"x24" 18ga (0.05") rolled into I think a 5 or 5= .5" can. You can go heavier ga, I just guessed.=C2=A0 https://www.mcmaster.com/1754T51/=C2=A0=C2=A0 - Matt Boiteau =C2=A0 =C2=A0 On Wed, Jul 8, 2020 at 2:35 PM Bobby J. Hughes bhughes@qnsi.net wrote: I=E2=80=99m at the exhaust header stage in my S21 FWF build. I=E2=80=99m co= nsidering a traditional header, =C2=A03-1 merge collector with 1.75=E2=80= =9D primaries to a 2.5=E2=80=9D tube. I=E2=80=99m trying to be very weight = conscious and looking for possible alternatives. The CA manifold can likely= be built for nearly the same weight as the header design in the picture. I= =E2=80=99m a little concerned with the tangential design. Mark S. built and= tested one on his 20B. It ran hot and caused the outer water jacket seals = to fail. Mark was not running a wideband so he couldn=E2=80=99t see a clear= relationship between F/A and EGT=E2=80=99s.=C2=A0 He may have be running a= t or near peak EGT=E2=80=99s. EGT=E2=80=99s for the renesis can be kept to = between 1500F -1600F with a little extra or a little less fuel. I will like= install the coolant radiator on the belly so adding an external muffler wo= uld keep it off centerline.=20 =C2=A0 I have located some reasonable priced Inconel 625 0.040 sheets. If rolled i= nto a 5-6=E2=80=9D tube, would this thickness be sufficient for a muffler s= hell or the CA / tangential manifold tube? =C2=A0 Matt, =C2=A0 How is your CA header holding up? =C2=A0 Thanks, =C2=A0 Bobby =C2=A0 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 Sent: Saturday, January 25, 2020 7:53 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Mufflers =C2=A0 Okay so after 2 full days of having our welder out, finally brought the CAD= design to life. Except both days were all nighters, so I was too tired and= busy to take 'in progerss' pictures. Was tricky to build, which made the h= ourly welding cost sky high, more then the engine itself. Hopefully that me= ans I can save money in the future on hearing aids. Thanks Charlie for the tip on the=C2=A0spectrum analyzer. I didn't get any = before numbers, but it's all low Hz now. That harsh high pitch is gone. Db'= s are still there, but I'd say with just the muffler design, it's comparabl= e to=C2=A0typical=C2=A0lycoming. I can start to hear the prop noise over th= e engine noise. I measured back pressure around 3.5psi @ 2200rpm prop. I ran out of time to flight test the long pipe under the airplane. I quickl= y held it up with my hands and the exhaust pretty much disappeared with the= prop taking over the noise. Before flying, I want to add backpressure gaug= e to that part and drill holes to find a balance between backpressure and n= oise. =C2=A0 SO the "header" muffler should make quite like any other plane, and the "un= der belly" pipe will make you standout in=C2=A0silence. =C2=A0 Since this email type newsletter is from the=C2=A0dinosaur=C2=A0ages, I'll = add pictures and video=C2=A0to=C2=A0https://www.homebuiltairplanes.com/foru= ms/threads/exhaust-within-subcowl.30848/page-2#post-512762 =C2=A0 - Matt Boiteau On 2020-01-18 5:29:51 PM, Matt Boiteau wrote: Have started on the exhaust. Made all three primaries 2" double slip joints= (that alone took almost a whole day with welder). The big can (CA -=C2=A0C= entrifugal Accumulator) rolled into a 5" can and we'll secure it to the eng= ine with straps. The inside pipe is 2.75" which has an area of 5.94sq". I'm not sure if ther= e's a magic number, but all the holes I drilled equaled to just under doubl= e the area (11sq"). Most are 3/8, but I did add some 1/2 to get the total a= rea up.=C2=A0Could we get away with drilling less holes? Not sure. I'll be = able to drill out one side end of the CA and pull out the inner tube and ch= ange out. Will=C2=A0experiment=C2=A0later=C2=A0with less holes and monitor = back pressure. Will weld a npt bung on the CA and use the wideband bung to = measure the different. The previous exhaust with just an=C2=A0Aero Turbine 2525XL, measured ~113dB= A. With nothing, was closer to 120dBA. Funny around 2000 prop rpm was loude= r then at 2300 full static.=C2=A0 Error! Filename not specified. =C2=A0 - Matt Boiteau On 2020-01-07 12:19:23 AM, Matt Boiteau mattboiteau@gmail.com wrote: Okay I'll make all 3 primary tubes (2" diameter) all double slip fit. Weldi= ng=C2=A0batwing=C2=A0tabs (picture below) on to either side on the slips, w= ill hold the muffler to the header but allow expansion. =C2=A0 Having troubles finding 2.75" bends in 321, so I might have to just switch = to 3" downpipe that is more common. Vband clamp before downpipe for easier = removal and under the plane to allow adding additional exhaust setups (long= pipe with holes drilled in it, fishmouth tailpipe, etc) I found a company that makes flex bellows in 321. I'm just not sure if I sh= ould have it vertical on the downpipe or close to the muffler horizontal be= fore the first 90degree bend downwards. https://www.aceraceparts.com/products/3-000-flex-bellow-assembly-321-stainl= ess?variant=3D11067135556 Error! Filename not specified. =C2=A0 =C2=A0 Batwing tabs Error! Filename not specified. =C2=A0 - Matt Boiteau On 2020-01-03 4:22:18 PM, Neil Unger 12348ung@gmail.com wrote: Mat, =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 As usual I have no idea.=C2=A0 I made all 3 sli= p joints and to date no grief in that area.=C2=A0 I am coming around to the= stock manifold in some way.=C2=A0 Yes it is heavy, but appears to muffle t= he noise as well.=C2=A0 Know of 2 installations that use the stock manifold= with a simple muffler after and both claim "acceptable" noise. It appears = that the stock manifold has a big influence on noise??=C2=A0 Would prefer a= DB reading, but if not available it is what it is.=C2=A0 All is compromise= , weight, cost, time, but at the end of the day it has to work.=C2=A0=20 Still working on the turbo even though the world is on holidays.=C2=A0 All = to save my hearing.=C2=A0 So far the rotary is definitely "unique" as far a= s a turbo is concerned.=C2=A0 The heat generated exceeds all else.=C2=A0 Tw= o things to date -- special exhaust wheel and water cooled bearing body =3D= , all for heat.=C2=A0 Have modified the stock front plate on the renesis to= take an electric water pump.=C2=A0 That is the simple bit. Neil. On 1/4/2020 5:37 AM, Matt Boiteau mattboiteau@gmail.com wrote: okay I found a good company called SPD Exhaust. They have everything you ne= ed in 321ss. With the engine being an RX8, we have three exhaust ports. Should I weld th= e front and back solid to the muffler, and make the middle one a slip fit f= or expansion? Or vice-vesa? Error! Filename not specified. =C2=A0 - Matt Boiteau On 2019-12-28 11:03:42 AM, Finn Lassen finn.lassen@verizon.net wrote: I did something similar with my RV-3 13B decades ago. It split open at the = welds around one of the pipes from the manifold into the the big outer tube= . True, it did use individual manifold base plates, not the connected facto= ry manifold and the big tube was only 0.035. Still, I would recommend slip joints on two of the three pipes, like I adde= d on one of the pipes (cut through and a surrounding bigger pipe -- missing= in picture). Error! Filename not specified. Can't remember why I went from the above to individual runners into a perfo= rated pipe under the fuselage. Probably got lured by promise of increased p= ower by tuned lengths and still uncomfortable by the muffler being inside t= he cowling. Finn On 12/28/2019 12:10 AM, Matt Boiteau mattboiteau@gmail.com wrote: This is what I'm going to try in a few weeks.=C2=A0=20 "Exhaust valve opens and a pulse of hot gas puffs out through a short pipe,= then=C2=A0tangentially=C2=A0into a cylindrical canister. Being tangential,= the pulse flattens out and travels=C2=A0helically=C2=A0(rather than bounci= ng and reverberating around) along the inside curved wall of the can, spira= ling toward the exit, where it comes out more uniform in flow and so pretty= quiet." =C2=A0 Outer pipe =3D 321 ss 0.050 thick. Flat plate bent to a 5" tube Inner pipe =3D 321 ss 0.036 thick. 2.5" diameter (I might use 302ss 0.065 since I already have it) =C2=A0 From my understanding, the area of the holes should be double the area of t= he inner pipe.=C2=A0 =C2=A0 - Matt Boiteau =C2=A0 =C2=A0 Disclaimer The information contained in this communication from the sender is confiden= tial. It is intended solely for use by the recipient and others authorized = to receive it. If you are not the recipient, you are hereby notified that a= ny disclosure, copying, distribution or taking action in relation of the co= ntents of this information is strictly prohibited and may be unlawful. This email has been scanned for viruses and malware, and may have been auto= matically archived by Mimecast Ltd, an innovator in Software as a Service (= SaaS) for business. Providing a safer and more useful place for your human = generated data. Specializing in; Security, archiving and compliance. To fin= d out more Click Here. -- Homepage:=C2=A0 http://www.flyrotary.com/ Archive and UnSub:=C2=A0 =C2=A0http://mail.lancaironline.net:81/lists/flyro= tary/List.html ------=_Part_193493_291332681.1601458684732 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Where in Florida? I live in Florida in the winter.&nb= sp;  Lynn E. Hanover
 
In a message dated 9/30/2020 12:48:34 AM Atlantic Standard Time, flyrotary@= lancaironline.net writes:
 
I've been stuck in Canada far too long. Finally flying to = Florida on Sat to see my plane and start flying off the hours (trouble free= I hope)
my email is my name (without spaces) at normal gmail dot com.
- Matt Boiteau

On Tue, Sep 29, 2020 at = 3:02 PM Bobby J. Hughes bhughes@qnsi.net <flyro= tary@lancaironline.net> wrote:

Matt,

 

Did you make it back to Canada = in time for the first snow? I would like to discuss your MS install off lis= t when you have time.

 

Bobby

 

 

 

From: Rotary motors in aircraft [= mailto:flyrotary@lancaironline.net]
Sent: Wednesday, July 08, 2020 7:10 PM
To: Rotary mot= ors in aircraft
Subject: [FlyRotary] Re: Mufflers

 

Sadly, by the time the welder and I fin= ished, I only got about 2 hours on the plane before I had to pack up my win= ter trip. I was planning to go back in March to FL (I live in Canada) to st= art flying off the 25 hours, but you know how that all went. So I'm just si= tting here waiting for the borders to open up and fly my plane!

Earl= y conclusion is it worked pretty darn good. I'd say I'm equivalent to = an IO-360, maybe a tad quieter. Also on ground testing only, I quickly mock= ed up a long tube under the plane with holes drilled in it (with the end ca= pped off), and it pretty much got rid of all the engine noise, only prop no= ise. Haven't flown with that yet. One thing I still want to do is test the = backpressure. Making sure the CAN has enough holes inside.

The best = price I found on 321 was from ProFabrication. I went with 2.75" 20ga (0.035= ") on the downpipe & outlet.
https://www.profabrication.com/index.php/p= roducts/straight-tubing/321-stainless-steel.html

I did use SPD E= xhaust for the double slip joints at the primaries and downpipe. 2" 16ga (0= .06")
http://www.spdexhaust.com/pdfs/22-23_= Tubing.pdf  

For the CAN, McMasterCarr 24"x24" 18ga (0= .05") rolled into I think a 5 or 5.5" can. You can go heavier ga, I just gu= essed. 
https://www.mcmaster.com/1754T51/ &= nbsp;

- Matt Boiteau

 

 

On Wed, Jul 8, 2020 at 2:35 PM Bobby J.= Hughes bhughes@qnsi.net <flyrotary@lancaironli= ne.net> wrote:

I’m at the exhaust header= stage in my S21 FWF build. I’m considering a traditional header, &nb= sp;3-1 merge collector with 1.75” primaries to a 2.5” tube. I&r= squo;m trying to be very weight conscious and looking for possible alternat= ives. The CA manifold can likely be built for nearly the same weight as the= header design in the picture. I’m a little concerned with the tangen= tial design. Mark S. built and tested one on his 20B. It ran hot and caused= the outer water jacket seals to fail. Mark was not running a wideband so h= e couldn’t see a clear relationship between F/A and EGT’s. = ; He may have be running at or near peak EGT’s. EGT’s for the r= enesis can be kept to between 1500F -1600F with a little extra or a little = less fuel. I will like install the coolant radiator on the belly so adding = an external muffler would keep it off centerline.

 

I have located some reasonable = priced Inconel 625 0.040 sheets. If rolled into a 5-6” tube, would th= is thickness be sufficient for a muffler shell or the CA / tangential manif= old tube?

 

Matt,

 

How is your CA header holding u= p?

 

Thanks,

 

Bobby

 

From: Rotary motors in aircraft [= mailto:flyrotary@lancaironline.net]
Sent: Saturday, January 25, 2020 7:53 PM
To: Rotary m= otors in aircraft
Subject: [FlyRotary] Re: Mufflers

 

Okay so after 2 full days of having= our welder out, finally brought the CAD design to life. Except both days w= ere all nighters, so I was too tired and busy to take 'in progerss' picture= s. Was tricky to build, which made the hourly welding cost sky high, more t= hen the engine itself. Hopefully that means I can save money in the future = on hearing aids.

Thanks Charlie for the tip on the spectrum ana= lyzer. I didn't get any before numbers, but it's all low Hz now. That harsh= high pitch is gone. Db's are still there, but I'd say with just the muffle= r design, it's comparable to typical lycoming. I can start to hea= r the prop noise over the engine noise. I measured back pressure around 3.5= psi @ 2200rpm prop.

I ran out of time to flight test the long pipe u= nder the airplane. I quickly held it up with my hands and the exhaust prett= y much disappeared with the prop taking over the noise. Before flying, I wa= nt to add backpressure gauge to that part and drill holes to find a balance= between backpressure and noise.

 

SO the "header" muffler should make= quite like any other plane, and the "under belly" pipe will make you stand= out in silence.

 

Since this email type newsletter is= from the dinosaur ages, I'll add pictures and video to = ;h= ttps://www.homebuiltairplanes.com/forums/threads/exhaust-within-subcowl.308= 48/page-2#post-512762

 

- Matt Boiteau=

On 2020-01-18 5:29:51 PM, Matt Boitea= u <mattboiteau@gmail.com> wrote:

Have started on the exhaust. Made a= ll three primaries 2" double slip joints (that alone took almost a whole da= y with welder). The big can (CA - Centrifugal Accumulator) rolled into= a 5" can and we'll secure it to the engine with straps.

The inside = pipe is 2.75" which has an area of 5.94sq". I'm not sure if there's a magic= number, but all the holes I drilled equaled to just under double the area = (11sq"). Most are 3/8, but I did add some 1/2 to get the total area up.&nbs= p;Could we get away with drilling less holes? Not sure. I'll be able to dri= ll out one side end of the CA and pull out the inner tube and change out. W= ill experiment later with less holes and monitor back pressu= re. Will weld a npt bung on the CA and use the wideband bung to measure the= different.

The previous exhaust with just an Aero Turbine 2525= XL, measured ~113dBA. With nothing, was closer to 120dBA. Funny around 2000= prop rpm was louder then at 2300 full static. 

Error! = Filename not specified.

 

- Matt Boiteau=

On 2020-01-07 12:19:23 AM, Matt Boite= au mattboiteau@gmail.com <flyrotary@lancai= ronline.net> wrote:

Okay I'll make all 3 primary tubes = (2" diameter) all double slip fit. Welding batwing tabs (picture = below) on to either side on the slips, will hold the muffler to the header = but allow expansion.

 

Having troubles finding 2.75" bends= in 321, so I might have to just switch to 3" downpipe that is more common.= Vband clamp before downpipe for easier removal and under the plane to allo= w adding additional exhaust setups (long pipe with holes drilled in it, fis= hmouth tailpipe, etc)


I found a company that makes fl= ex bellows in 321. I'm just not sure if I should have it vertical on the do= wnpipe or close to the muffler horizontal before the first 90degree bend do= wnwards.
https://www.aceraceparts.com/products/3-000-flex-bellow-= assembly-321-stainless?variant=3D11067135556

Error! Filename not specifi= ed.

 

 

Batwing tabs

Error! Filename not specifi= ed.

 

- Matt Boiteau=

On 2020-01-03 4:22:18 PM, Neil Unger = 12348ung@gmail.com <flyrotary@lancaironline.n= et> wrote:

Mat,

           &n= bsp;      As usual I have no idea.  I made al= l 3 slip joints and to date no grief in that area.  I am coming around= to the stock manifold in some way.  Yes it is heavy, but appears to m= uffle the noise as well.  Know of 2 installations that use the stock m= anifold with a simple muffler after and both claim "acceptable" noise. It a= ppears that the stock manifold has a big influence on noise??  Would p= refer a DB reading, but if not available it is what it is.  All is com= promise, weight, cost, time, but at the end of the day it has to work. = ;

Still working on the turbo even though the world is on holidays.&nbs= p; All to save my hearing.  So far the rotary is definitely "unique" a= s far as a turbo is concerned.  The heat generated exceeds all else.&n= bsp; Two things to date -- special exhaust wheel and water cooled bearing b= ody =3D, all for heat.  Have modified the stock front plate on the ren= esis to take an electric water pump.  That is the simple bit.

Neil.

On 1/4/2020 5:37 AM, Matt Boiteau <= a href=3D"mailto:mattboiteau@gmail.com" target=3D"_blank" rel=3D"nofollow n= oopener">mattboiteau@gmail.com wrote:

okay I found a good company called = SPD Exhaust. They have everything you need in 321ss.

With the engine= being an RX8, we have three exhaust ports. Should I weld the front and bac= k solid to the muffler, and make the middle one a slip fit for expansion? O= r vice-vesa?

Error! Filename not specified.<= u>

 

- Matt Boiteau=

On 2019-12-28 11:03:42 AM, Finn Lasse= n finn.lassen@verizon.net <flyrotary@lan= caironline.net> wrote:

I did something similar with my RV-= 3 13B decades ago. It split open at the welds around one of the pipes from = the manifold into the the big outer tube. True, it did use individual manif= old base plates, not the connected factory manifold and the big tube was on= ly 0.035.

Still, I would recommend slip joints on two of the three p= ipes, like I added on one of the pipes (cut through and a surrounding bigge= r pipe -- missing in picture).

Error! Filename not specified= .

Can't remember why I went from the above to individual ru= nners into a perforated pipe under the fuselage. Probably got lured by prom= ise of increased power by tuned lengths and still uncomfortable by the muff= ler being inside the cowling.

Finn

On 12/28/2019 12:10 AM, Ma= tt Boiteau mattboiteau@gmail.com wrote:

This is what I'm going to try in a = few weeks. 

"Exhaust = valve opens and a pulse of hot gas puffs out through a short pipe, then&nbs= p;tangentially&= nbsp;into a cylindrical canister. Being tangential, the pulse flattens out = and travels helically (rather than bouncing and= reverberating around) along the inside curved wall of the can, spiraling t= oward the exit, where it comes out more uniform in flow and so pretty quiet= ."

 

Outer pipe =3D 321 ss 0.050 thick. = Flat plate bent to a 5" tube

Inner pipe =3D 321 ss 0.036 thick. = 2.5" diameter

(I might use 302ss 0.065 since I al= ready have it)

 

From my understanding, the area of = the holes should be double the area of the inner pipe. <= u>

 

- Matt Boiteau=

 

&= nbsp;

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