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Re: [FlyRotary] Re: Vapor Lock
Paul,
STANDARD PLUMBERS TEST
Ques – What makes liquid run
downhill? Ans – Gravity
MASTER PLUMBERS TEST
Ques – What makes liquid run
uphill? Ans – A pump
Herb J
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Paul
Sent: Wednesday, February 23, 2005
5:16 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Vapor
Lock
Thanks for the info, Tracy. My only
concern is this....if the Facet pump was not involved, might it be better to
have it back in the system so that if I have a future problem, I
could turn the Facet pump on to pressurize the sump tank with fresh fuel?
Ed seems to be comfortable with this, and has had to use it.
Of
course, on the other hand, if the Facet even partially contributed to
the vapor lock issue, I don't want it in my system. I need to talk
to Herb Sanders one more time, as he was concerned that because the Facet will
not allow back flow, it might be a major contributor to the vapor lock issue.
I'm feeling like my system is fairly simple as it now stands. Gravity feed,
only the two required EFI pumps, a vented sump tank, and a simple Andair fuel
selector valve. I do not need to transfer fuel from one tank to another, or anything like that. I can also select
"both" on the fuel selector, and balance fuel consumption
automatically, or just switch to left or right tank if needed. Paul Conner
----- Original Message
-----
Sent: Wednesday, February 23, 2005 1:12 PM
Subject: [FlyRotary] Re: Vapor Lock
Paul, one
last thought on the vapor lock thing. Very glad you have found that
it was the problem. There is nothing worse than not knowing.
It is quite possible
that changing EITHER of the two variables (in-line Facet or vent on the
header/sump tank) will make the system work. Just because you remove
one and it works does not mean you have found the root cause.
Earlier I used the "strikes" analogy, and we don't know how
many of these it takes to make an "out".
From your
background I'm sure you know that it is frequently a combination of things that
can cause a failure. Removing one of them may 'fix' the problem now but
add in other variables like fuel vapor pressure, altitude, etc, and the
problem could come back. The goal is to make the system as
tolerant of all factors as possible. Happily, this frequently means
making it simple too!
One other thought on
simplicity. I have never landed without power (in my rotary powered
plane) but I have come close several times in the early days. The only
thing that prevented it was having a fairly simple system and knowing it very
well. This helped diagnose the problem and fix or compensate for it
before running out of altitude and ideas.
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