From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.160.48; envelope-from=stephen.izett@gmail.com
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
Subject: Re: [FlyRotary] Re: Glasair Testing Continued
Date: Fri, 23 Mar 2018 22:05:28 +0800
References: <list-10868940@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-10868940@logan.com>
Message-Id: <F04A47F7-5FB8-4889-A8C2-5C138F65421C@gmail.com>

Hi Charlie
I do use Maximite, actually these days Geoff=E2=80=99s lattest =
Micromite, just better in every way.
The data is straight out of the Dynon Skyview log.
I will be using a micromite to display and log pressures around the =
coolers and cowl etc but haven=E2=80=99t finished the hardware or the =
software at this point.

We will tie it to a tree in the next few weeks so I can check to =
mixtures.
I very much doubt it will keep cool at static, she=E2=80=99ll overheat =
within I recon 4 minutes at WOT.
Our prop doesn=E2=80=99t;t have much blade close to the spinner where =
the water inlet is. The oil inlet is lower and does get better air from =
the prop.

Steve

> On 23 Mar 2018, at 9:20 pm, Charlie England ceengland7@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
>=20
>=20
> On Fri, Mar 23, 2018 at 7:35 AM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Hi people
>=20
> 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 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
>=20
> 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.
>=20
> Cheers
>=20
> Steve Izett
>=20
> Hi Steve,
>=20
> 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. Have you measured oil pressures on the inlet and outlet?=20
>=20
> 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.
>=20
> 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. :-)
>=20
> Charlie
>=20
> 	Virus-free. www.avast.com