Date: Sun, 04 Jul 2004 08:53:48 -0400
From: Steve Brooks <steve@tsisp.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Reality Check
Message-ID: <cfc59572e897213f8a49ac84de15c02c@tsisp.com>
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Dave,
If there was one thing that I learned from doing taxi tests, it is that they will definitely not be the same in the air.  On the ground, I can taxi all over and the temps are fine.  You are right about high power, the temperature climbs pretty quick.

On the ground, my oil temperture is lower than the coolant.  Flying is just the opposite.

I agree with John Slades advice.  Try to take off on a cool morning and keep the taxi/runup to a minimum to keep temps down before take off.  

I would add to that to keep your airspeed up on the climb.  I do mine climb at 110-120 knots.  The temperature stays much cooler than a 90-100 kt. climb.  I gain altitude slower, but still getting over 1000 FPM, so not a problem.  I also keep my boost down to 5 lbs.  At 7-8 lbs the temperature really rockets up.  Of course, so does the plane.

My wife and I are visiting our daughters up in Raleigh, NC this weekend, so no flying.  I see that the weather at home is Sunny, both today, and tomorrow.....figures.  


Steve Brooks


-----Original message-----
From: daveleonard@cox.net
Date: Sat,  3 Jul 2004 11:19:01 -0400
To: "Rotary motors in aircraft" flyrotary@lancaironline.net
Subject: [FlyRotary] Reality Check

>  Congrats, Todd, That must be a great feeling.  I like running behind the engine I rebuilt myself instead of the "new" engine I used to have.
>  
>  As I approach my first flight I need a reality check.  Like Steve, I am starting to worry about cooling.  I did some high speed taxi testing yesterday.  Everything went very well but I am very impressed with how quickly using high power will make the coolant temps go up.
>  
>  After 2 high speed runs down the 5000' runway everything seemed to be heat soaked and up to steady state - oil 180, coolant 160.  With only a few seconds of high power needed to get me up to stall speed on my third run, the coolant had heated up to 220 by the end of the runway, but cooled back down to 180 on the taxi back.
>  
>  This seems somewhat in line with what others have reported as successful, but I am afraid of what high power on climb-out is going to do.
>  
>  Is there anyone who feels that this is probably not going to be good enough?
>  
>  Thanks,
>  Dave Leonard
>  
>  > 
>  >     Well after a little time out for an engine rebuild I finally got back
>  > into the air again. Tonight's flight was 1 hour and absolutely no problems
>  > at all. I wasn't planning on flying again until I installed my transponder
>  > due to an incredible amount of water bomber traffic at our strip, but the
>  > damned thing is still somewhere between Australia and here. They were
>  > extremely aggressive at attacking the fires so that when we had some
>  > moderately heavy rain these last 2 days they gained complete control and
>  > this morning declared them 100% contained. So this evening was eerily quite
>  > up at the airport, just begging for me to go flying... so we did.
>  >     It sure was good to get back up there again. Tomorrow should be more of
>  > the same so I hope to get some good tests done and have more to report.
>  > S. Todd Bartrim
>  > Turbo 13B RV-9Endurance
>  > C-FSTB
>  > http://www3.telus.net/haywire/RV-9/C-FSTB.htm
>  > 
>  >    "Whatever you vividly imagine, Ardently desire, Sincerely believe in,
>  > Enthusiastically act upon, Must inevitably come to pass".
>  > 
>  > 
>  > 
>