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unuseable fuel for w&b calculations.

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docyukon(at)ptcnet.net
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Posted: Tue Nov 15, 2011 7:27 am Post subject: unuseable fuel for w&b calculations.

How mutch fuel should be considered unuseable  for  w&b calculations.  Pulsar lll  with only  wing          

          Thanks       Bill S.   

   [quote][b]

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ccoulter(at)wavecable.com
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Posted: Tue Nov 15, 2011 7:51 am Post subject: unuseable fuel for w&b calculations.

On Tue, 15 Nov 2011 09:25:43 -0600

  "Bill S" <docyukon(at)ptcnet.net> wrote:

 	  Quote: 	
		   How mutch fuel should be considered unuseable for  w&b 

calculations.  Pulsar lll  with only wing          

        Thanks       Bill S.  


	


Bill



You have to determine this for your plane, Mine could be 

different than yours.



Clarke

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briana(at)xtra.co.nz
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Posted: Tue Nov 15, 2011 12:17 pm Post subject: unuseable fuel for w&b calculations.

Bill,



For w&b calculations a few litres of unuseable fuel on each side will make little difference. The quantity depends on the position of you pickup tube and the attitude of the plane.

But, it is far better to know what the minimum fuel is likely to be in flight, then err significantly on the conservative side to make sure you don't even get close to that number.

I know that, on the ground, my tanks have less than 2 litres each when the flow stops. It would be madness though to approach that in flight.

Brian



On 16/11/2011, at 4:25 AM, Bill S wrote:

 	  Quote: 	
		  How mutch fuel should be considered unuseable for  w&b calculations.  Pulsar lll  with only wing          

        Thanks       Bill S. 

 	  Quote: 	
		  



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 [quote][b]

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sonja.englert(at)juno.com
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Posted: Wed Nov 16, 2011 7:03 am Post subject: unuseable fuel for w&b calculations.

The unusable fuel in flight depends very much on the flight conditions. I have done those measurements for the Columbia 400 and found it varies greatly from <1.5 gal (smooth air, wings level) to about 4 gal per tank (wing) in turbulent, sideslip, steep climb or descent conditions. For certified airplanes, the worst case (in this case 4 gal) is declared unusable. Total qty per wing was 50 gal. For the Pulsar, I would think 1/2 gal is appropriate if your pickup is low enough and you do not slosh it around.



Sonja



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rwilhelm(at)dc.rr.com
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Posted: Wed Nov 16, 2011 7:15 am Post subject: unuseable fuel for w&b calculations.

Just a word of caution, In a hard long slip the fuel pickup will unport.

Flying into Thermal, I usually come in over the mountains at 7500 ft and

have to drop to -185 to land at Thermal. So, yes, I do a hard slip to drop

altitude at near 1500 ft/min.  If I have the tank selected that is away from

the slip and I have less than 4 gal. the pickup will unport.



Ray   Pulsar III/3300

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