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Subject: Re: [FlyRotary] N774CG, RV-10 20B first flight
References: <list-5506173@logan.com>
From: Tracy <rwstracy@gmail.com>
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Message-Id: <DEE4BE6B-C6CF-4E73-9995-D87149FAEEF7@gmail.com>
Date: Wed, 25 Apr 2012 13:40:44 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Tim,
    As you found out, unless you used the draggy barn door approach to engin=
e cooling,  ground cooling means almost nothing as an indicator of how it wi=
ll work in-flight.

I'm using the Sam James (holey) cowl and have the same 20B engine on my RV-8=
.  The stock 4.75" inlets were not adequate for me so probably not for you e=
ither.  I ended up with 5.75" inlet for the water and 5.25" for the oil cool=
er.   I also increased the outlet area but my RV-8 outlet may have been a bi=
t smaller than the RV-10 version.   There are lots of other variables involv=
ed besides the inlet size that have to be right as well (diffuser, inlet sha=
pe, etc.). =20

I doubt you damaged the engine on that short term overtemp.  I once had a ma=
lfunction of a coolant cap and lost a lot of coolant, coolant temp went to 2=
58, oil to 230 and flew 8 miles to closest airport (at minimum power) and en=
gine did not suffer at all. =20

Keep working on it.  First flight is only the beginning : )

Tracy

Sent from my iPad

On Apr 25, 2012, at 11:16 AM, Tiffanie Holt <coastiefamily4@gmail.com> wrote=
:

> Well, got up this morning and did the first flight on the RV-10.  OAT
> 55 Degrees at 7000 ft.  Did the taxi to the runway and the water temp
> was 168 and oil was 150.  Everything looked full power in and off we
> went.  She has plenty of power, RPM was 7000, and here comes the
> temps.  I immediatelly turn to down wind at 80kts and the water temp
> came up to 220 and oil at 200.   Turned base and temps still climbing
> still at 80 kts, turned attention to land vise temps.  I landed
> immediately and taxied back to the hangar and the temps peaked at 245
> water and 240 oil.  She got hot, I got boil over once I shut the
> engine down.  I took all the cowls off to help the cooling of the
> engine.  Check everything over, turned the prop and listened for any
> unusual noise, checked the oil and could smell the 2 stroke oil in it,
> which I understand is normal.
>=20
> She Flew, but not what I expected on temps.  These are the highest
> temps that I have seen so far.  I had 11 hours on ground runs, but I
> did not let water temps get above 205 and oil temp normally stayed at
> 180.
>=20
> At the hangar, I let the temps get to 180 on water and 160 on oil, I
> filled the expansion tank back up and ensure there was coolant and
> started her back up to see if I had normal readings.  Oil pressure was
> on the rise, oil temp was at 175 and water temp stabilized at 190,
> Just wanted to ensure I did not do damage to the engine and that she
> would start. She was a little hard to start, but started purring like
> a kitten again.  Shut her down, and then started her back up and she
> immediately turn over.
>=20
> Did not run her much longer, had to shut her down and get to work.
>=20
> Are there any suggestions or inspections that I will need to do on the
> engine for the high temps?
>=20
> Things I plan to do before next run:
> 1. Oil Change, Filter Clean: It is time for a cleaning and I can
> inspect the oil.
> 2. Flush the radiator: Ensure everything looks normal
> 3. The highest point in my water system is the expansion tank, but the
> water return is at a level slightly below the expansion tank.  I plan
> to install a fill/bleed valve in it to ensure all the air is out of
> the system.
> 4. Move the Water Temp Sensor from the block to the return line to the rad=
iator
> 5. Place the Louvers in the cowling.  I did put the louvers in per
> Van's Plans, but I put then in the cowl to help pull the heat from the
> exhaust system.
> 6. I will also open up the inlet to the Radiator as well.  The
> standard Sam James Cowl has a 4 3/4 inch Diameter opening, I will open
> it up more and give it at try.
>=20
> Any suggestions would be greatly appreciated.
>=20
> Tim
>=20
> --
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