X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PbaBeRpd c=1 sm=1 tr=0 a=CFuOtv4x9PT3uejCWY+iqg==:117 a=x7bEGLp0ZPQA:10 a=ad1WmcueCrwA:10 a=y4yBn9ojGxQA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=3oc9M9_CAAAA:8 a=0qqORytXAAAA:8 a=7g1VtSJxAAAA:8 a=VvWLD30Kn0tGu67CBxkA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=N9O39SYlJW9qjLzjVBYA:9 a=4cY3MBt8J5_mhiKp:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=Nj1bhqyGrdl6Az3_ctNx:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "William Jepson wrjjrs@gmail.com" Received: from [209.85.167.53] (HELO mail-lf1-f53.google.com) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 613459 for flyrotary@lancaironline.net; Fri, 07 Aug 2020 02:26:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.167.53; envelope-from=wrjjrs@gmail.com Received: by mail-lf1-f53.google.com with SMTP id x24so405320lfe.11 for ; Thu, 06 Aug 2020 23:26:14 -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=O/xQn687bT3fA9ii8xJB9YN44YJ4ULEppCW4BeGqR8c=; b=r9pTeJOjrqyiEypxqxLfR/8la8OiiU7P2c/Njnhbj0ha/zvLDmY82RIpylPe7D6tBa tBFdBaWE3drgYfWfQT7jEmqcvKqgFe2M5Wk3VLIaLpSDq2tN+P5tMkZdTQ7tMjAjV5HE 1Hz7GCRuO9Yu5pIa3BG+aoHDf/dO48Dyd9xbOpQGpg6/e2+v+B/fV8n68icW4c/womzl Xe/oDQSbqbCnf2osqg2kKUGr9QqcaTZr/Qdi1C96KloALmYLY4loJDkwgkFDi45/TECe vjYNgKdtRaSJSSRanrKxmxE9Xap6KeFQin/SoM5bW7/8DVjj4sJtwTZcqhTFModbqVAL fOBA== 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=O/xQn687bT3fA9ii8xJB9YN44YJ4ULEppCW4BeGqR8c=; b=sfRp4BMbh7Z3vqNllqNSQIZLn10PzMH4LDORAk0h05tonCqRsgWlMe9qnw3Xqz6iA9 /IeAA/ooJneBFEkfkGrB2b0Mh9B//0UJjUkfTEJE+/SWIVf1k/aukeGbxZfcXXecVmVZ Ks074FkyxaFeDHTNGXkJAujM7fSDP8TFIDJK4Asd3TqpYx2MkdwaAQbWZeITVbtr2x9Y mGuTBHhxxZsB+aMvlO1x1SnX+CqRuX4PtPrDIlHiJUNH9nZo0zee/2GTsMBLPrLamJh7 fOJpKsIdrcPL6cBIydeOVCptC24CLEMCmPBjXfyGldDgBwvudSCKnWOyvD7pEW2xMcuZ Yq9Q== X-Gm-Message-State: AOAM532BmoU1CAu6ln/vYFdoF5fWQe+YDovvg49epJLkeTJRKJ4RZz08 KUNZQw2J2V2JHMf5pvl5T0E7VlqlmqI0e2GlYyLWGQ== X-Google-Smtp-Source: ABdhPJxmxjYEWeJkMdHF4K0z9TacuVe2+DVG/kvwx+QwxbIwQOcHn3UEnq/SWOuD2nNFK2VXCrD6OKWmvqLyxTKktW0= X-Received: by 2002:a05:6512:5c5:: with SMTP id o5mr5623397lfo.26.1596781555179; Thu, 06 Aug 2020 23:25:55 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Thu, 6 Aug 2020 23:25:44 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Dyno Sheet To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="00000000000061665e05ac43ad42" --00000000000061665e05ac43ad42 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Stephen, The answer to one of your questions is easy. A fast cruise RPM should be 6000. Mazda did many instrumented runs and found that 6000 rpm was a sweet spot where the dynamics balanced perfectly. At 6000 there is almost no load on the bearings. The rotary would run at that RPM indefinitely. If you have more power at higher speeds you can use that for maximum speed. Those RPMs are eshaft RPMs not propeller. Bill On Thu, Aug 6, 2020 at 4:15 PM Stephen Izett stephen.izett@gmail.com < flyrotary@lancaironline.net> wrote: > Hi Guys > > Thanks for all the feedback. > I think I didn=E2=80=99t explain my objective clearly enough. > > Some questions: > 1. Given I have variable pitch, what combination of MAP and RPM should I > climb or cruise at? With fixed pitch I dont suppose you think in these > terms. > So should I be Climbings at WOT & 7000rpm OR WOT & 6300rpm Best Power > Mixture. > > I think Lynn best understood my intention of trying to use the flight as = a > dyne - I didn=E2=80=99t realise the complexity of the relationship of mix= ture and > timing at various settings, thanks Lynn. > I thought by keeping WOT and mixture constant I might ascertain a maximum > efficiency combination for MAP/RPM. > > I=E2=80=99d like a combination for max power. I=E2=80=99m thinking identi= fied by higher > fuel burn and IAS for the climb, and > a max efficiency/ecconomy combination for cruise identified by best miles > per gallon. > > I thought our Renesis with our modified OEM (shortened) manifold but no > variable intake valves etc. would have a distinctive peak at ~6400-6600rp= m. > > 2. I=E2=80=99m finding tuning the EC2 (objective being EC provides consta= nt > mixture across the flight envelope) is dependant on the combination I > choose to tune it at. > Eg. Tune EC2 MCT for one MAP/RPM combination, say a cruise of 18=E2=80=9D= AND 5000 > rpm, then the EC will not be able to provide a constant mixture if I then > choose 18=E2=80=9D at 6000rpm. > My EC2 has Tracy=E2=80=99s 8 table setup but fueling requirements given t= he extra > permutations provided by the variable pitch prop (climbing that hill - > which gear should I use - 3rd 4th or 5th??) > appears to stretch its inherent capabilities. So I want a plan for what > MAP/RPM I will use and then adjust/tune the EC MCT for that combination. > > Thanks again guys. > > Steve Izett > > > all is nice if you fly that combination. If I then choose ab > > > On 7 Aug 2020, at 6:16 am, lehanover lehanover@aol.com < > flyrotary@lancaironline.net> wrote: > > > > Your thinking is correct. Control full throttle RPM with load. Then > experiment always at that particular RPM until you have whatever data poi= nt > you were after. Everything affects everything so it may be that (for > example) advancing ignition timing at one RPM adds power but at another R= PM > reduces power. A rich mixture at one RPM may increase power but reduce > power at another RPM. To recover even similar data on consecutive days is > difficult. The SAE has some charts that produce a multiplier to account f= or > density temperature and so on. Required to compare results day to day. It > takes a long time to collect good data.......... > > > > Lynn E. Hanover > > > > > > > > > https://search.aol.com/aol/image?p=3Ddyno+sheets+for+stock+rx-7+engines&s= _it=3Dimg-ans&v_t=3Dloki-keyword&fr=3Dloki-keyword&imgurl=3Dhttp%3A%2F%2Fww= w.rx7club.com%2Fattachments%2Ftime-slips-dyno-128%2F346326d1243952257-anyon= e-have-stock-turbo-ii-dyno-graph-stock-s4-t2.jpg#id=3D19&iurl=3Dhttp%3A%2F%= 2Fwww.rx7club.com%2Fattachments%2Ftime-slips-dyno-128%2F346326d1243952257-a= nyone-have-stock-turbo-ii-dyno-graph-stock-s4-t2.jpg&action=3Dclick > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --00000000000061665e05ac43ad42 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Stephen,=C2=A0
The answer to = one of your questions is easy. A fast cruise RPM should be 6000. Mazda did = many instrumented runs and found that 6000 rpm was a sweet spot where the d= ynamics balanced perfectly. At 6000 there is almost no load on the bearings= . The rotary would run at that RPM indefinitely. If you have more power at = higher=C2=A0speeds you can use that for maximum speed. Those RPMs are eshaf= t RPMs not propeller.
Bill

On Thu, Aug 6, = 2020 at 4:15 PM Stephen Izett st= ephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
Hi G= uys

Thanks for all the feedback.
I think I didn=E2=80=99t explain my objective clearly enough.

Some questions:
1. Given I have variable pitch, what combination of MAP and RPM should I cl= imb or cruise at? With fixed pitch I dont suppose you think in these terms.=
So should I be Climbings at WOT & 7000rpm OR WOT & 6300rpm Best Pow= er Mixture.

I think Lynn best understood my intention of trying to use the flight as a = dyne - I didn=E2=80=99t realise the complexity of the relationship of mixtu= re and timing at various settings, thanks Lynn.
I thought by keeping WOT and mixture constant I might ascertain a maximum e= fficiency combination for MAP/RPM.

I=E2=80=99d like a combination for max power. I=E2=80=99m thinking identifi= ed by higher fuel burn and IAS for the climb, and
a max efficiency/ecconomy combination for cruise identified by best miles p= er gallon.

I thought our Renesis with our modified OEM (shortened) manifold but no var= iable intake valves etc. would have a distinctive peak at ~6400-6600rpm.
2. I=E2=80=99m finding tuning the EC2 (objective being EC provides constant= mixture across the flight envelope) is dependant on the combination I choo= se to tune it at.
Eg. Tune EC2 MCT for one MAP/RPM combination, say a cruise of 18=E2=80=9D A= ND 5000 rpm, then the EC will not be able to provide a constant mixture if = I then choose 18=E2=80=9D at 6000rpm.
My EC2 has Tracy=E2=80=99s 8 table setup but fueling requirements given the= extra permutations provided by the variable pitch prop (climbing that hill= - which gear should I use - 3rd 4th or 5th??)
appears to stretch its inherent capabilities. So I want a plan for what MAP= /RPM I will use and then adjust/tune the EC MCT for that combination.

Thanks again guys.

Steve Izett


=C2=A0all is nice if you fly that combination. If I then choose ab

> On 7 Aug 2020, at 6:16 am, lehanover lehanover@aol.com <flyrotary@lancaironline.net> w= rote:
>
> Your thinking is correct. Control full throttle RPM with load. Then ex= periment always at that particular RPM until you have whatever data point y= ou were after. Everything affects everything so it may be that (for example= ) advancing ignition timing at one RPM adds power but at another RPM reduce= s power. A rich mixture at one RPM may increase power but reduce power at a= nother RPM. To recover even similar data on consecutive days is difficult. = The SAE has some charts that produce a multiplier to account for density te= mperature and so on. Required to compare results day to day. It takes a lon= g time to collect good data..........
>
> Lynn E. Hanover=C2=A0
>
>
>
> https:= //search.aol.com/aol/image?p=3Ddyno+sheets+for+stock+rx-7+engines&s_it= =3Dimg-ans&v_t=3Dloki-keyword&fr=3Dloki-keyword&imgurl=3Dhttp%3= A%2F%2Fwww.rx7club.com%2Fattachments%2Ftime-slips-dyno-128%2F346326d1243952= 257-anyone-have-stock-turbo-ii-dyno-graph-stock-s4-t2.jpg#id=3D19&iurl= =3Dhttp%3A%2F%2Fwww.rx7club.com%2Fattachments%2Ftime-slips-dyno-128%2F34632= 6d1243952257-anyone-have-stock-turbo-ii-dyno-graph-stock-s4-t2.jpg&acti= on=3Dclick


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