X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PbaBeRpd c=1 sm=1 tr=0 a=4Z7bLzRdO3NTdMHb7ZukIA==:117 a=x7bEGLp0ZPQA:10 a=ad1WmcueCrwA:10 a=y4yBn9ojGxQA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=MGNBsn_HPIUaIJwvP4sA:9 a=khcPRlDrSqMBszMX:21 a=-EE_sLHWtSbJGAbQ:21 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=-WRATXKxbqRw938MadcA:9 a=uMjfemXLIlDkhIHE:21 a=4kwLh7SuRKvnet4T:21 a=AEdNQ2P8xhKBWIZC:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "William Jepson wrjjrs@gmail.com" Received: from mail-lj1-f178.google.com ([209.85.208.178] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 611644 for flyrotary@lancaironline.net; Thu, 06 Aug 2020 13:57:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.208.178; envelope-from=wrjjrs@gmail.com Received: by mail-lj1-f178.google.com with SMTP id w14so22942684ljj.4 for ; Thu, 06 Aug 2020 10:57:32 -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=J7/Jl+0LaMDS39EpN/P0DTXvBLm7H2uvi4HyUl/BMgI=; b=nO0f+mM6JZ2nWNiQId5KRYNiKMOIKMCYhNAPfnSrsAaG2IF56ThfI5FDE8/UXNIQeQ 18Fa8Xmi8VappoD6AvUGkl0bebrQzORzbbHd2AqVkvr+XdkGGD2OORUYpoYwaFWPaCWS oFYjxNRBo+tP6F/IPME9gFO2AG2YdCVA6ag5KtFw8P9veBe3CPYmf8D4YUCiiNW5ANs8 AGG8A3M+MW8krtVtGLH/XKoi1ISXP6jwxqb++g3PqzxtxGdgJyfFRP+LuKCL2qatkHHo D2/sTrsevEGZDJ7TE796yOYNx7Ic2REdfU9SclQhrQYJqPlYZR3PKVbOkRWuwWpwoyKQ ndAg== 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=J7/Jl+0LaMDS39EpN/P0DTXvBLm7H2uvi4HyUl/BMgI=; b=UW5c00t26B7DMa6ZWmYR/ZrgEnAfV0Fln/Dd0r+/7x+yklKLAbZG0MT6r1rE+gTWfE UueymX6qJptYvtNYn7o9TABTN8XA0uv7R+u0FWvf53KD5IuAERZzvEOVR/2XI6P+npwN Zr7RZoJ169YrvkGXhJTWu7jPrBfdQIQs5Rf/chQc1bqoGOmKnbjuxbiSdDfk7+VxsN8s VSlGHCU06+XlnyYLul5ugsbeOg2AZCHybonXfkxbxq/+bCLYG2/uCooME60fkz2xIgkM 0hZrl9B37lc1y32AtDWrvo2aV0Cdla4AdlX4s+9XgaPoS7OZjwEBY9isnk3ujrH7mqNx wSaA== X-Gm-Message-State: AOAM533dONtl+IMzgp2dME9HG/tB+41q0qyZZmXBOZR3gnrUj55rx+8Q 7PdqvmzwqDLYrHTXRKDn1U5NQy2/u8Wyq9hWrrlH5w== X-Google-Smtp-Source: ABdhPJyWuefT6IhAH0z5246QHl2mBMgEqg2jm+Ewpbc3bs7FHubs1lPmXbfYLHqW1CJy63G1o27BtS8mjOuL5YzMwdQ= X-Received: by 2002:a2e:874c:: with SMTP id q12mr1041869ljj.380.1596736634848; Thu, 06 Aug 2020 10:57:14 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Thu, 6 Aug 2020 10:57:03 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Testing best rpm power setting To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000eb8a6205ac39374b" --000000000000eb8a6205ac39374b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dave, Yes that=E2=80=99s true of most of the standard port engines, except the Re= nesis. The Renesis has bigger side ports without overlap. It was designed to peak at higher rpm. Bill On Thu, Aug 6, 2020 at 10:47 AM David Leonard wdleonard@gmail.com < flyrotary@lancaironline.net> wrote: > Bill, > I guess you are right about peak power RPM. I have been thinking about > turbo, p-port, and highly tuned applications where the torque curve does > not drop off as fast. Looks like typical n.a. does indeed peek around > 6000-6500RPM. > > I still maintain that Max RPM should be determined by prop tip speed. Of > course, one could always adjust prop length so that redline lands at a > desired RPM. > > Dave Leonard > > Dave Leonard > > On Thu, Aug 6, 2020 at 9:17 AM William Jepson wrjjrs@gmail.com < > flyrotary@lancaironline.net> wrote: > >> Steve, >> On the dyno you will know better, but on the 4 port (stock) you should >> see peak power at less than 7k. On the small port version of Powersport= =E2=80=99s >> p-port with a similar intake length they were seeing best power at about >> 6,500. They may have been slightly over-proped. I would expect a similar >> max power with standard side ports. Or possibly even lower rpm. >> Bill >> >> On Thu, Aug 6, 2020 at 7:59 AM Stephen Izett stephen.izett@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >>> Hi guys >>> >>> I=E2=80=99m wanting to inflight test for the best RPM for peak power of= our 4 >>> port Renesis with variable pitch prop (No constant speed control at >>> present). >>> On Takeoff at Full Fine we hit 6900 after a few seconds and then rpm >>> builds to 7400 by 500 feet and 110 KIAS >>> I=E2=80=99m wondering if we are well past the peak torque and would be = better >>> off at a lower rpm. >>> >>> Am I right in thinking the following would use the aircraft as a Dyno t= o >>> establish rpm for best power? >>> >>> 1. Set up level flight (auto pilot) >>> 2. Maintain WOT and constant mixture (best power - say 0.9 Lambda - 13.= 2 >>> AFR) via Wideband O2 >>> 3. Vary RPM in 200rpm increments for 2 minutes each setting between 560= 0 >>> and 7200 by adjusting prop pitch >>> 4. Note Fuel Flow and IAS (Logged on Dynon Skyview) >>> >>> I=E2=80=99m thinking this would give me an indication of best RPM for h= ighest >>> power. >>> Our Inlet is just under 19=E2=80=9D long, measured from the side face o= f the >>> engine. >>> So I=E2=80=99m thinking peak torque may be around 6400 rpm. >>> >>> Your insight would be appreciated. >>> Thanks >>> >>> Steve Izett >>> Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop >>> >>> >>> >>> >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >> --000000000000eb8a6205ac39374b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dave,
Yes that=E2=80=99= s true of most of the standard port engines, except the Renesis. The Renesi= s has bigger side ports without overlap. It was designed to peak at higher = rpm.
Bill

<= div dir=3D"ltr" class=3D"gmail_attr">On Thu, Aug 6, 2020 at 10:47 AM David = Leonard wdleonard@gmail.com <= flyrotary@lancaironline.net<= /a>> wrote:


On Thu, Aug 6, 2020 at 9:17 AM William Jepson wrjjrs@gmail.com <flyrotary@lancaironline.net> wrote:

On Thu, Aug 6, 2020 at 7:= 59 AM Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
<= /div>
Hi guys

I=E2=80=99m wanting to inflight test for the best RPM for peak power of our= 4 port Renesis with variable pitch prop (No constant speed control at pres= ent).
On Takeoff at Full Fine we hit 6900 after a few seconds and then rpm builds= to 7400 by 500 feet and 110 KIAS
I=E2=80=99m wondering if we are well past the peak torque and would be bett= er off at a lower rpm.

Am I right in thinking the following would use the aircraft as a Dyno to es= tablish rpm for best power?

1. Set up level flight (auto pilot)
2. Maintain WOT and constant mixture (best power - say 0.9 Lambda - 13.2 AF= R) via Wideband O2
3. Vary RPM in 200rpm increments for 2 minutes each setting between 5600 an= d 7200 by adjusting prop pitch
4. Note Fuel Flow and IAS (Logged on Dynon Skyview)

I=E2=80=99m thinking this would give me an indication of best RPM for highe= st power.
Our Inlet is just under 19=E2=80=9D long, measured from the side face of th= e engine.
So I=E2=80=99m thinking peak torque may be around=C2=A0 6400 rpm.

Your insight would be appreciated.
Thanks

Steve Izett
Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop






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