REFLECTOR: Oil Temps - Ground Ops

[Craig and/or Denise Woolston]

Yes, it's factory-reman so that might explain some of it.  I had heard this,
so we have tried to minimize our playing around on the ground.  I'm
satisfied that the airplane is ready to fly.  It's the argument between
making sure the engine's okay and not doing what you said below.  Hopefully
we haven't "crossed the line" yet.  The engine has approx. 0.5 hours at this
point and I know it's not my butt on the line but I think I have a enough
interest that I believe the plane and test pilot will be okay on first
flight.  I certainly don't think we need to do anymore ground tests.  The
test pilot wants to do a low speed run, nose wheel lift off and then the
next day, a high speed crow's hop, then taxi back and fly.

 

Craig

 

 

 

 

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Baker
Sent: Tuesday, August 22, 2006 2:01 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Oil Temps - Ground Ops

 

Craig,

If you have a new engine, or a newly overhauled engine with new rings -
higher oil temps are to be expected.

If you have a new engine, or a newly overhauled engine with new rings, one
sure way to glaze the cylinders is to spend time on the ground at low power
settings - 

Engine manufacturers and mechanics recommend the aircraft be run a very high
power settings as soon as possible in order to promote the best "breaking
in" of the engine.

SB

 

----- Original Message ----- 

From: Craig <mailto:cdwoolston at verizon.net>  and/or Denise Woolston 

To: 'Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders
list' 

Sent: Monday, August 21, 2006 11:55 PM

Subject: REFLECTOR: Oil Temps - Ground Ops

 

John and I are starting to get real data from taxing around.  Wanted to
bounce some numbers off the "collectively wisdom".

 

With an OAT of 103 deg F we got oil temps to around 230 after, 10 minutes of
taxing, one long runup and 40 knot taxi test down the runway.  We then went
to the compass rose and sat for about 1-2 minutes before we shutdown.

 

We then swung the compass for about 30 minutes, restarted, taxi back down,
another long runup, 40 knot taxi test on the runway, taxied back to the
hanger and we were at 220 deg F.

 

CHTs never went above 350 deg F, most were in the high 200s for the idling
parts.

 

We have an IO-550 with the stock cooler on the engine (no ducting) and the
standard nose cooler.

 

Comments?

 

Craig

XL-5FG, Palmdale, CA

 


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