X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "David Leonard wdleonard@gmail.com" Received: from mail-oi1-f174.google.com ([209.85.167.174] verified) by logan.com (CommuniGate Pro SMTP 6.3.5) with ESMTPS id 154645 for flyrotary@lancaironline.net; Tue, 20 Jul 2021 23:06:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.167.174; envelope-from=wdleonard@gmail.com Received: by mail-oi1-f174.google.com with SMTP id u11so1482078oiv.1 for ; Tue, 20 Jul 2021 20:06:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=3kKInO/y9B/vp75qW+zGnHEXlmhvezxe9WPv0so+bEU=; b=eAr+Z3WV4JdrbHBUpXk17THozCtWrxNZ3neHQBUiUipvDxRt6u5GDSbIIkLNCBtgFI V1aA+4MOm9s4qiLQMhi3rZFAHQO3NZtue2nyQJ1XB5sbSg2fMiI2nBZ3o5g1xxSSW/cg 2eKozpBId1VJ0mPO7jZ6QnqNosKs0lN2FtQwpqOZo6UHHKsORwfQQcZObEQISkxvlxXn uOuwd05u43sA4MGxEKOTkIaeSMjLLuMOyhf4mbIdgsU+A+gNR6yEP+x1yLR24RAMBeCX erQDw+0nuzCXJsNt7oRhyoZsceVQBJxL7igINO2q178B/fGjYETF6WJOGyDWZVq+GO6F hwPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=3kKInO/y9B/vp75qW+zGnHEXlmhvezxe9WPv0so+bEU=; b=oefRfPmyD0WHCsGLbzSggV/pUBKTcgIR+j0TYM2xhb8jKrvflzCmYjujRkLMG64sGt 6WzguL7DddC1tem5rR+NDBWqJ0dDJQUoKma1vwjPtdc8nysNVyuis7uo5WCp7SKu4JvD DfDOwLNXyY4/QoTHvvQP4WXA7zgx+SKiNfqroG6G+1+vpkQhxBj0wXqOhM41GIZPPnQs bI6cuQvz85Nh7+BHVhJqELpcaVtnRYK6bsNbNijM7MZffjq+8iTekD4I+bcuV5650bcl wmqVr2x8YtIaZV5cRO9gn6cNnVrjylPC9cg8ztW8InlMpAqUQ70gJbU0/a4/o3ypB8RQ TWdQ== X-Gm-Message-State: AOAM533C8YzJzjH3pSSiTjbcQ+SYay9aTYCjlmqFI+pLdLeEayrNWftp T5Trn4Du84V7bTbUlN+WO5VjKiHVTFHn+798ubsZ7ADgIHA= X-Google-Smtp-Source: ABdhPJyR72FU/LPY9oW6zSig6yXXmWV8qD5nkNFy9Vj38NOR9w5e4S8GkiYqSSSORSJVoxUZsTFCZiuZaE+7d8YzYCA= X-Received: by 2002:aca:f48e:: with SMTP id s136mr22912809oih.42.1626836760844; Tue, 20 Jul 2021 20:06:00 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Tue, 20 Jul 2021 20:05:50 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Exhaust taming To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000003cdd5605c799738a" --0000000000003cdd5605c799738a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Definitely you wont know if you dont check it at WOT, preferably in flight. It is louder for sure without the resonator though. Dave Leonard On Tue, Jul 20, 2021 at 4:32 PM Stephen Izett stephen.izett@gmail.com < flyrotary@lancaironline.net> wrote: > Thanks Dave for the feedback. > I=E2=80=99ve never run it without the resonator (on the ground I mean). > Perhaps I should try it and compare fuel flow/power at WOT. > > Cheers > Steve > > > On 21 Jul 2021, at 2:33 am, David Leonard wdleonard@gmail.com < > flyrotary@lancaironline.net> wrote: > > Hi Steve, > For sure, Mild steel will not hold up in the early parts of the > rotary's exhaust system. 304 usually does pretty well, but I used 316 > whenever I could find the size and shape I needed in 316. In particular, > the welds on the 304 have needed touching up after 1200 hrs, but the 316 = is > fine except for the welds to the turbo flange, which I have also had to > touch up. They eventually developed cracks and leaks. > > I have also tried a muffler similar to the one you show. It held up fine > to 20 or so flight hours, but there was a very noticeable power loss so I > removed it. > > Best, > Dave Leonard > > On Mon, Jul 19, 2021 at 6:10 PM Stephen Izett stephen.izett@gmail.com < > flyrotary@lancaironline.net> wrote: > >> Hi people >> >> After only ~40 hours of flight + ground testing the mild steel 2.5=E2=80= =9D >> resonator in our system was looking a lilt worse for wear. >> The leading edge of the internal auger/spiral was disintegrating. >> >> We have purchased a 304 stainless version that=E2=80=99s an inch longer = and >> having it ceramic coated inside and out before reinstalling. >> >> When I had the Glasair on the apron at full tilt the other day for some >> tuning of the newly installed EC3, a guy >> commented on its noise being similar to other quiet Lycomings. As in >> loudness, not pitch. >> >> I don=E2=80=99t know how much back pressure this type generates. Here th= ey are >> called a =E2=80=9CGonzo=E2=80=9D. They claim to be used in drag rotary a= pplication. >> Would be interesting to instrument it, but I don=E2=80=99t think I can b= e >> bothered, as it seems to be developing good horsepower. >> >> I expect this new stainless version will last much longer and be at leas= t >> as effective. >> But the proof will be when I run it up and next annual. >> >> Here are some photos >> >> Cheers >> >> Steve Izett >> Glasair Super IIRG >> >> >> >> >> > > --0000000000003cdd5605c799738a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Definitely you=C2=A0wont=C2=A0know if you dont=C2=A0check = it at WOT, preferably in flight.=C2=A0 It is louder for sure without the re= sonator=C2=A0though.

Dave Leonard

On Tue, Jul 20, 2= 021 at 4:32 PM Stephen Izett ste= phen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
Thank= s Dave for the feedback.=C2=A0
I=E2=80=99ve never run it without the re= sonator (on the ground I mean).
Perhaps I should try it and compare fue= l flow/power at WOT.

Cheers
Steve


On 21 Jul 2021, at 2:33 am, D= avid Leonard wdleo= nard@gmail.com <flyrotary@lancaironline.net> wrote:

Hi Steve,
For sure, Mild steel will not hold up in the earl= y parts of the rotary's=C2=A0exhaust system.=C2=A0 304 usually does pre= tty well, but I used 316 whenever I could find the size and shape I needed = in 316.=C2=A0 In particular, the welds on the 304 have needed touching up a= fter 1200 hrs, but the 316 is fine except for the welds to the turbo flange= , which I have also had to touch up.=C2=A0 They eventually developed cracks= and leaks.=C2=A0=C2=A0

I have also tried a muffle= r similar=C2=A0to the one you show.=C2=A0 It held up fine to 20 or so fligh= t hours, but there was a very noticeable=C2=A0power loss so I removed it.

Best,
Dave Leonard

On Mon, Jul 19, 2= 021 at 6:10 PM Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wr= ote:
Hi peo= ple

After only ~40 hours of flight + ground testing the = mild steel 2.5=E2=80=9D resonator in our system was looking a lilt worse fo= r wear.
The leading edge of the internal auger/spiral was disinte= grating.

We have purchased a 304 stainless version= that=E2=80=99s an inch longer and having it ceramic coated inside and out = before reinstalling.

When I had the Glasair on the= apron at full tilt the other day for some tuning of the newly installed EC= 3, a guy=C2=A0
commented on its noise being similar to other quie= t Lycomings. As in loudness, not pitch.=C2=A0

I do= n=E2=80=99t know how much back pressure this type generates. Here they are = called a =E2=80=9CGonzo=E2=80=9D. They claim to be used in drag rotary appl= ication.
Would be interesting to instrument it, but I don=E2=80= =99t think I can be bothered, as it seems to be developing good horsepower.=

I expect this new stainless version will last muc= h longer and be at least as effective.
But the proof will be when= I run it up and next annual.

Here are some photos=

Cheers

Steve Izett
=
Glasair Super IIRG

<DSCN0026.jpg>

<IMG_04= 71.jpeg><IMG_0467.jpeg>

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