dredmoody(at)cox.net
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 Posted: Tue Sep 11, 2007 12:56 pm Post subject: RE : Cylinder cooling issues - Guidance from Jabiru |
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Someone previously posted what that 6" of water differential pressure would produce as the reading on an ASI. Wasn't it something in the neighborhood of 60 mph?
Ed
---- Andy Silvester <info(at)suncoastjabiru.com> wrote:
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Jerome,
Three things to point out:
1. The latest test has different reference points than before, when the pressure was compared with ambient and at an airspeed of only 1.3 Vs.
2. The higher pressure differential reflects both pressure and suction, i.e. inside the cooling duct is compared to a point adjacent to the cowling outlet.
3. The 6" differential will be obtained at normal cruise speeds, which is easier to monitor in the air rather than (in my view) trying to maintain a speed of 1.3Vs and looking at the manometer.
I hope this clears-up the confusion. My advice is to use the later information rather than that published in existing manuals - they will be updated soon.
Andy Silvester
Suncoast Sportplanes Inc.
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