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Dale,
Dale Rogers wrote:

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?

Yes

<>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.)

That's so, but when you do discover the failure, you'll still have at least 2/3 of the fuel in your delivery tank left. You can get a little more by seriously crabbing the airplane, but shouldn't need to do that. I know Facet pumps fail, but I've never had one and don't recall anyone in my circle of acquaintances complaining of such a failure.

<>
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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