From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Glasair Testing Continued
Date: Sat, 24 Mar 2018 08:16:01 +0800
References: <list-10869153@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-Id: <9A46CBC6-968F-47D0-9D9F-5C44BAFF6E61@gmail.com>


> On 23 Mar 2018, at 10:24 pm, Tracy Crook rwstracy@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Haven=E2=80=99t had occasion to test the RV-8 this way but on an 85 F =
day my RV-4 will eventually get up to about 224F (oil and gas) while =
taxiing and stabilize there.  This does not harm the engine at all.  But =
if I were to start a takeoff roll at that temp the coolant will boil =
during a normal climb out.  If I nurse it carefully (minimum climb rate =
& best cooling airspeed of 125 mph) it will start cooling down before =
boiling.  Never gotten into a situation where this was an operational =
problem.
> =20
> Tracy
> =20
> =20
> =20
> Sent from Mail for Windows 10
> =20
> From: Stephen Izett stephen.izett@gmail.com
> Sent: Friday, March 23, 2018 10:05 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Glasair Testing Continued
> =20
> 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.
> =20
> 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.
> =20
> Steve
> =20
> > On 23 Mar 2018, at 9:20 pm, Charlie England ceengland7@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >
> >
> >
> > 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 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
> >
> > 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. Have 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
> =20
> =20
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