From: Jim Sower <canarder@frontiernet.net>
Date: 2005/02/25 Fri PM 02:12:46 EST
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: fuel flow
<... introduce a new wrinkle ...>
Not really new. Solve that little issue with what is really the best design. To wit:
Draw from Right wing (via sump if you like)
Return to Right wing (run return pretty far outboard - at least past the first baffle)
Have a Facet transfer from Left wing to Right wing.
Put a one or two minute timer on transfer pump if you like to prevent forgetting it and overflowing right tank (I plan to have 3-pos xfer switch ON - OFF - Momentary ON so that I have a choice of timer controlled or pilot controlled transfer. It has the additional (very important IMO) feature of being able to transfer Left tank bone dry. I am a lot more comfortable late in the flight knowing that every drop of gas on board is in the SELECTED tank.
? Go ahead - ask my why I feel so strongly about that :o) ... Jim S.
Jim I can understand the latter concern. Nevertheless, I have a couple of concerns regarding the facet pump. How does one check it's functionality in pre-flight? Is it noisy enough that turning it on results in instant recognition? It's also a single point of failure that could leave me with a strake full of gas that I can't get at. (I suspect this list has had this part of the discussion before, too. I oughta go search the archives.)
Dale R.
COZY MkIV-R13B #1254
Ch's 4, 5 & 23 in-progress
<... introduce a new wrinkle ...>
Not really new. Solve that little issue with what is really the best
design. To wit:
Draw from Right wing (via sump if you like)
Return to Right wing (run return pretty far outboard - at least past
the first baffle)
Have a Facet transfer from Left wing to Right wing.
Put a one or two minute timer on transfer pump if you like to prevent
forgetting it and overflowing right tank (I plan to have 3-pos xfer
switch ON - OFF - Momentary ON so that I have a choice of timer
controlled or pilot controlled transfer. It has the additional (very
important IMO) feature of being able to transfer Left tank bone
dry. I am a lot more comfortable late in the flight knowing that every
drop of gas on board is in the SELECTED tank.
Go ahead - ask my why I feel so strongly about that :o) ... Jim S.
Dale Rogers wrote:
Jim Sower <canarder@frontiernet.net> wrote:
We've already discussed this too much - it's all been said more
than once ... Jim S.
Jim,
Indeed it has ... but you did introduce a new wrinkle
(for me, anyway - and I've been on the list, what, three
years?): the concern about pumping air from a "dry" tank
into the fuel rail. Since my fuel system, when I get that
far, is pretty much like the Parmalee system,
http://www.marcnadine.com/Menu.html
and I planned to use "both" on takeoff and landing, this
is some concern to me.
It's defininely something I want to experiment with on
my test cell.
Dale R.
COZY MkIV #1254
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