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Date: Wed, 02 Jan 2008 16:55:19 -0500
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From: randy snarr <randylsnarr@yahoo.com>
Subject: Re: [LML] Re: fuel question 235/320/360
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Scott,
Thank for the very thoughful response. 
I have a 235 with a 320 engine and constant speed
propeller and big battery in the tail. The fuel
reconfig is for CG purposes. I am in pretty good shape
but I often fly alone with 15 or so gallons. In that
config I am on the front edge of the envelope. I would
rather have a near empty header and pull from the
wings  which would put me in middle of the envelope. 

Thanks again...
Randy.

--- Sky2high@aol.com wrote:

>  
> In a message dated 12/31/2007 1:39:57 P.M. Central
> Standard Time,  
> randylsnarr@yahoo.com writes:
> 
> I am  looking for feedback from those who pull fuel
> directly from their wings 
> that  do not have slosh boxes installed. My fuel
> pickups are in the typical 
> place  (BL 50 about 2/3 of the way back between the
> front and rear spar).
> I am  contemplating changing the fuel system with a
> 3 way valve to pull from 
> Left  Main and Right tanks.
> I would be very interested to know if you ever
> unport  the fuel and under 
> which conditions it happens if  ever.
> 
> 
> 
> Randy,
>  
> I can only answer your question theoretically.  I
> believe in the  simple 
> system pretty much as designed for the wee Lancairs.
>  As such, the  wings can be 
> completely emptied into the header tank while in
> level flight  (down to the 
> last cupful), thus maximizing the available fuel 
> onboard.  
>  
> Drawing directly from a wing without a slosh chamber
> means that at some  
> lesser fuel level, the wing feeding the engine can
> unport via a slip, skid,  
> uncoordinated flight, high pitch angle (extended
> climb or descent) or a  spin.  The 
> fuel level may be different for each of the
> conditions listed  and it is 
> doubtful if any were tested whilst the wings were
> off the airplane  when it is 
> easy to check at certain pitch angles.  Let's see,
> how about a  Vx, Vy or missed 
> approach climb out with a standard rate  turn
> (albeit slightly uncoordinated) 
> away from the 1/4 filled  wing?  Does this mean the
> checklists for takeoffs, 
> landings and  approaches contains a check off  to
> switch to the wing with a 1/2 
>  or better fuel quantity?  So many bad possibilities
> are extant.
>  
> Some planes that have 3-way selectors and pumps that
> are  utilized to keep 
> the header full, where the header is used for
> takeoff and  landing or reserve 
> only.  The selector valve is considered a backup in
> case  a pump (or the 
> complete electrical system) should fail.
>  
> Of course, others (like myself) keep the header tank
> full (>8 gal) at  all 
> times (engine sole fuel source) and have pre-made
> the decision that  should they 
> note a pump failure, the "nearest airport" GPS
> function is  activated.  The 
> safest way to reach your destination is with 
> everything working - even if it 
> takes a day or two longer.  We look at the  header
> as the main fuel tank and 
> the wings merely as aux tanks.
>  
> Scott Krueger  AKA Grayhawk
> Lancair N92EX IO320 SB 89/96
> Aurora, IL  (KARR)
> 
> Darwinian culling phrase: Watch  This!
> 
> 
> 
> **************************************See AOL's top
> rated recipes 
>
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)
> 


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