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Date: Thu, 17 Feb 2005 00:01:01 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Vapor Lock
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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:
>
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>>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
>>    
>>
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>>> Homepage:  http://www.flyrotary.com/
>>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
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