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Thanks Scott,
You are right about what I said and I will clarify a little. I say if it wont cool on the ground, it wont cool in the air because when I first started flying I had marginal cooling on the ground and marginal cooling in the air. At that time I could idle and taxi indefinitely unless the OAT was above 85 or so, when my taxi times would be limited to about 30 minutes. cooling in the air was similarly limited to shallow climbs and less than full power in all but the coolest of climates.
However, Chris may be talking about high power ground runs which is a different story. A full 5 minutes at full power on the ground is sure to push the limits of most installations, and a temporary spray bar fed from a hose is a reasonable thought if you feel the need to do extended ground runs at or near full power.
BTW Scott,
I just took another look at your website and picture. You sure have done very nice workmanship. I can't wait to see that thing fly! It is guaranteed to be one of the fastest RV's around.
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
On Sat, Apr 17, 2010 at 8:55 PM, <shipchief@aol.com> wrote:
Chris & Terria:
I had ground running temp issues at lower power. Dave Leonard told me that it's important to get it to self cool at low to mid power on the ground. He said that reliance on sufficient cooling when you come up to flying speed most likely won't work if it won't self cool on the ground. I took his advise and redesigned my cooling system, which by the way looks a lot like yours with major differences being cooler ducting and cooler orientation. He's a link to my page @ EAA326 site: http://gallery.eaa326.org/main.php?g2_itemId=1727
Tracy has commented that I should have reduced the cross section of my oil cooler duct more quickly to force the air to uniformly pass thru the oil cooler core. I applied that thinking to my water cooler which I built next, and it worked even better than my cardboard and tape trial duct. What is the engine RPM and % load that you start to have cooling problems?
Scott
-----Original Message-----
From: Chris and Terria < candtmallory@embarqmail.com>
To: Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent: Sat, Apr 17, 2010 10:02 am
Subject: [FlyRotary] cooling for ground runs
Gents,
I am doing the higher power ground runs now, and am only able to run for about 5 minutes before reaching 195* or so. I’m looking for ideas on how to extend the time for each ground run. I was thinking of adding a spray bar like others have discussed. My thought was to drill some holes in some PVC and connect it to the garden hose. Then put it in the intake in front of the radiator. I would have to run the hose out the front and clamp it down so it doesn’t come close to the prop.
I’m open to all ideas though.
I’ve attached a picture that shows my radiator and duct work.
Thanks,
Chris
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