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Aerobatics is kind of in the eye of the beholder. I've seen all those guys doing unnatural acts with a small biplane at OSH, but when I was in the business, tactical jets had about 5-10 sec inverted fuel and NO oil. That's A4, F8, F4, F9, etc. They've always fought the wars with positive G, and I don't think that's changed (Blues and Thunderbirds notwithstanding :-). Anyone with F16 or FA18 time let us know if that's changed.
You can do lots of interesting and fun stuff without negative G ... Jim S.
Bulent Aliev wrote:
Paul, my vote is against that Facet pump. If you are so stuck up on
aerobatics (with an airplane not designed for it), the sump tank will be
able to supply you with fuel for the brief negative G moments. Is your
lubrication system aerobatics compliant too? I don't think so. Upside down
time your engine will be running with no oil. Just my opinion?
Buly
On 2/16/05 8:25 PM, "Paul" <sqpilot@bellsouth.net> wrote:
I ran my engine today with all the firesleeve installed and the new sump
tank vent. After 3 engine runs at WOT, the water temp hit 230 (and
climbing), and the engine started acting just like it did the day of my
forced landing. Sputtering, erratic and finally just it quit, and would not
restart. I turned on my inline Facet fuel pump. It took 3 or 4 seconds,
then the engine came back to life. I was able to taxi back to the hangar (I
used about 1/2 throttle to get the aircraft rolling, then throttled back a
bit to taxi). My Facet pump is between the main tanks and the sump
tank.(after the fuel selector valve). The EFI pumps are after the sump tank
and before the fuel rail/regulator. The unused fuel from the regulator
returns to the sump tank. There is no way the engine would run without the
Facet pump to push fresh gasoline into the sump tank, which was obviously
filled with gas and bubbles after the thorough heat soaking it received.
With the Facet pump still on, and taxiing under reduced power, the temps
came down from 240 to 210 by the time I reached the hangar, and shut it
down. My sump tank is vented with a 3/16" OD line on the top, which goes
into the top of my left fuel tank. The line is opaque, and I can see fuel
movement going through the new vent line when the Facet pump is turned on.
Unfortunately, I can't tell if it is clear fuel or bubbles, or a mixture, as
the line is opaque rather than clear, but I can definately see motion and
tell it's direction of flow. Hope this more helpful than confusing. Paul
Conner
----- Original Message -----
From: "Jim Sower" <canarder@frontiernet.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, February 16, 2005 10:41 AM
Subject: [FlyRotary] Re: Vapor Lock
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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