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Okay Bill sounds like you're on the right track ... btw, my manometer is no longer open to cabin static pressure either. Other suggestion is to keep your inlets as low as possible on the cowling to stay in the high pressure area ... see attached pressure distribution picture.
If the big fan out front (or behind) stops turning, your ear pressure will definitely build up.
Jeff
Jeff,
That is my plan when I get everything back together. I bought a Dwyer Magnehelic guage on Ebay. It is 0-30 inches of water. Will read positive or negative depending on where you attach your tubes. Will withstand a max of 15 psi. I bought it because it will be easier to take readings when in flight (assuming I ever fly the thing) and will prevent the dreaded colored water spill. I am going to use it to get readings from various places inside the cowl and air inlets and outlets. I have a couple of air temp sensors that are long enough to reach most places in the cowl to check temps and if needed there are more places to put thermocouples on the EM-2 that I am not now using.
I would think zero differential would mean that there is no air flow coming to the oil cooler, or if the cooler dumps into the cowl, the pressure inside the cowl is the same as the pressure coming to the cooler.
Instead of having the manometer open in the cockpit, I plan to have the two tubes on both sides of the exchanger to see the drop thru the exchanger.
And also a check with one tube in the inlet and one in a static area to find the inlet pressure, and again with one tube in the outlet area and one in static to find the pressure behind the exchanger.
Maybe one in my ear to check my pressure when it doesn't cool! :>) Bill -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Wednesday, August 12, 2009 10:24 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Manometer was : [FlyRotary] Re: T-shirt design
Jeff, I went back and check my emails and apparently the latest photo I have
is the 15 July photo you used. I don't think I ever got any photos of you
manometer readings after you moved the position of the probes - if I did, I
can not find them.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
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