X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=L5hfeKb8 c=1 sm=1 tr=0 a=dIavB+HnD6SO0Y3oYPq1Pg==:117 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=v2DPQv5-lfwA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=_6GpL_ENAAAA:8 a=9vpSDwlpKSXU1O3jl-QA:9 a=QEXdDO2ut3YA:10 a=K-_dry_312jvMR_HzdsA:9 a=XOkrY1pt33pK2X1h:21 a=Urk15JJjZg1Xo0ryW_k8:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-pf0-f180.google.com ([209.85.192.180] verified) by logan.com (CommuniGate Pro SMTP 6.2.2) with ESMTPS id 10868944 for flyrotary@lancaironline.net; Fri, 23 Mar 2018 09:20:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.180; envelope-from=ceengland7@gmail.com Received: by mail-pf0-f180.google.com with SMTP id v66so2226859pfv.7 for ; Fri, 23 Mar 2018 06:20:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=RnZ6ndWvACFcHGofsoD5/41tD/VSZuug74fRHfCkovU=; b=ilZXQS5LfY/dvOYo0LTjEw9C43zns3+Hk+8WyFJX1+RdvYuIInKNX460WHWJ91GLo/ tRpDmSRYADHYx1wCvqLgwBFdhD94Nv5OHZEOCmyp1xQJ56/Zt0hiCUJgzX6/Y8nPlx4I GwYtuISWTfTz5FF8Tr3o8X1TjUs/kosPVxn/DWM+XHNgOCHab6A1kbQLTfcZ/AuH5KZR GdzaonVgBQ5oPS6zJ9Q0gXosKHi6I1KJjuQXtLaZoHHmt+3lZEFQN5EkJU30hknBHYMH cTNovCuiqgRsc3rw4JN5nAqbL+lrnBKxE80BBHSBfzuLdiRe7OGPXL/E+HRrVoxC6Zm9 a9gA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=RnZ6ndWvACFcHGofsoD5/41tD/VSZuug74fRHfCkovU=; b=NQB5CqZg3iTisrvUee86NTP2LRfklMQ1VvjB6zjiCXAFJinACrl3vgCKzPa2qZG5SG 3ULTf/RIqHI3UTTI/y0RVwyPuDyEU59Ysp4rUwjNJylGXVzLZ61W7gzFmPA5kjS7l/eb h11cVx6tC5DiwhgS8hPUu21UcdWPmzHijRuv+tcVJO9HVA/Em3P4ow0h2373MyQsOMYs gmzodeahJCDFfwosueTtkDvC/JPenVQG0JM9PgbRxaPCPxSj+INAmzg/OYJt7rsT62YJ rGAxUPJXy0Z37PGj9w+emBE7lZItyPlb7QNdt3+nBVOeEpEX6Tasj8+ZU+mFiSkzQbzr /uOA== X-Gm-Message-State: AElRT7Em8QA87Jk2EFI8Nlv6wtKQFSAEq/lRBvvouQ+GsXWigNCKR7DV FDu8PYBta9TvlrINTHfODDU4SZaOofo7hhvJt8E= X-Google-Smtp-Source: AG47ELso1E14rdKxss6nS9qDRxoTdhYrqL/VZvWIgz5YQjHhZSLgmJxkEnDOe0YEZheAkrYGwDsV6G9tQiwo3e0EFTM= X-Received: by 10.99.94.197 with SMTP id s188mr20699408pgb.363.1521811204453; Fri, 23 Mar 2018 06:20:04 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.162.39 with HTTP; Fri, 23 Mar 2018 06:20:03 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Mar 2018 08:20:03 -0500 Message-ID: Subject: Re: [FlyRotary] Glasair Testing Continued To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="94eb2c0c65f441b9280568144863" --94eb2c0c65f441b9280568144863 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 23, 2018 at 7:35 AM, Stephen Izett stephen.izett@gmail.com < flyrotary@lancaironline.net> wrote: > Hi people > > I know how much I have appreciated data over the years so for those > interested here is some more. > Having looked at last weeks test data and the temps looking like they wer= e > close to stabilised after reaching around 212F I thought I would risk it > and see what the temps did get to. > The temp senders are calibrated accurately up to boiling point (within <1= F > at 212F) but I=E2=80=99m not sure how accurate they are up at 225F. > The graph below is 43minutes of repeatedly (12 times) taxing and then > running down our ~1000yard strip at between ~20-37knots > The OAT was 74-77F during this test. > Renesis 4 port RD1C EC3 EM3 Elect Adj Prop > Water cooler is 540in3 (custom dual pass) with inlet of 20in2 > Oil Cooler is 193in3 (mazda rx7 turbo) with inlet of 7.5in2 > > I=E2=80=99m wondering what a 30row oil cooler like Tracy uses might do to= both the > oil and water temps. > We will press on and hopefully flight test it as soon as we have it > licensed. > > Cheers > > Steve Izett > > Hi Steve, Steve Boese has posted some of his pressure differential data on a Mazda cooler. He was seeing a really large oil pressure drop across the cooler, indicating highly restricted flow through it. Less flow=3Dless cooling. Hav= e you measured oil pressures on the inlet and outlet? As Tracy has mentioned in the past, short bursts of power won't really tell you much relative to sustained high power. Too many variables: inconsistent heat input, and inconsistent air flow for cooling (varying speeds). Since you have a controllable prop, have you tried tying the plane down & doing a sustained run at, say, 75% power? Surely the plane would get off the ground using 75% power, so if you can cool with static (only the prop) airflow into your heat exchangers, flying speeds will only help with cooling mass flow through the coolers. Are you the one using a Maximite to gather your data? If so, would you be willing to share your code? I can handle most things electronic, but I'm not any kind of coder at all. :-) Charlie Virus-free. www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --94eb2c0c65f441b9280568144863 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Fri, Mar 23, 2018 at 7:35 AM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancai= ronline.net> wrote:
Hi people

I know how much I= have appreciated data over the years so for those interested here is some = more.
Having looked at last weeks test data and the temps looking= like they were close to stabilised after reaching around 212F I thought I = would risk it and see what the temps did get to.
The temp senders= are calibrated accurately up to boiling point (within <1F at 212F) but = I=E2=80=99m not sure how accurate they are up at 225F.
The graph = below is 43minutes of repeatedly (12 times) taxing and then running down ou= r ~1000yard strip at between ~20-37knots
The OAT was 74-77F durin= g this test.
Renesis 4 port RD1C EC3 EM3 Elect Adj Prop
Water cooler is 540in3 (custom dual pass) with inlet of 20in2
Oi= l Cooler is 193in3 (mazda rx7 turbo) with inlet of 7.5in2

I=E2=80=99m wondering what a 30row oil cooler like Tracy uses might= do to both the oil and water temps.
We will press on and hopeful= ly flight test it as soon as we have it licensed.

= Cheers

Steve Izett

Hi Steve,

Steve Boese has posted some= of his pressure differential data on a Mazda cooler. He was seeing a reall= y large oil pressure drop across the cooler, indicating highly restricted f= low through it. Less flow=3Dless cooling. Have you measured oil pressures o= n the inlet and outlet?=C2=A0

As Tracy has mention= ed in the past, short bursts of power won't really tell you much relati= ve to sustained high power. Too many variables: inconsistent heat input, an= d inconsistent air flow for cooling (varying speeds). Since you have a cont= rollable prop, have you tried tying the plane down & doing a sustained = run at, say, 75% power? Surely the plane would get off the ground using 75%= power, so if you can cool with static (only the prop) airflow into=C2=A0 y= our heat exchangers, flying speeds will only help with cooling mass flow th= rough the coolers.

Are you the one using a Maximit= e to gather your data? If so, would you be willing to share your code? I ca= n handle most things electronic, but I'm not any kind of coder at all. = :-)

Charlie

3D"" Virus-free. www.avast.com
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