REFLECTOR: Fwd: My Velocity setup
Joe
jewen at comporium.net
Fri Dec 3 16:58:58 CST 2004
Some years ago, Tracey Crook, who uses a rotary had insufficient oil cooling (1/3 of heat rejection is through the oil) he ran a coil inside of his oil pan and circulated a portion of his cooling water though this coil before it went to the radiator. This appears to have been the little extra oil cooling he needed to get the oil temps where he wanted them. The interesting part of his report was he felt this setup improved his overall cooling and attributed it to the higher coolant temp resulting in a higher delta T at the radiator with a resulting higher transfer rate.
This may be enough to avoid an oil cooler in your application.
Joe
----- Original Message -----
From: NMFlyer1 at aol.com
To: reflector at tvbf.org
Sent: Friday, December 03, 2004 3:11 PM
Subject: Re: REFLECTOR: Fwd: My Velocity setup
That's true, but I don't need it at cruise. Im just trying to sneak a little extra flow when Im taxiing or sitting still. After that, my scoop design takes over.
My idea behind this is to scavange some of the flow that comes through the bottom radiator, across the bottom of the pan, and out the "suction slot". at about 18" from the center of prop rotation, it should also add to the suction the prop places on the cowl opennings. Well.. at least that is my idea, we'll see if it works out. I am hoping that I can get away without an oil cooler with that setup. No worries though, I have a backup to put an inline cooler on the #2 NACA scoop if I need it.
Keep in mind that the reduced pressure (“suction”) generated by the prop dissipates rapidly (exponentially) as you move away from the prop, so even a foot is a long way - and at cruise it is almost non-existent; you have to rely on dynamic pressure and whatever gradients are produced by the flow. Remember, the air is standing still, the airplane is moving. Some air is getting pushed/pulled downward by the airfoils, some is being pushed back by the prop, the rest is getting out of the way as best it can.
Al
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