Duncan,
This shoulnd't be an issue. The fuel system design, and any subsequent
modifications to it, must have been demonstrated to comply with the
requirements of JAR-VLA which demand, (in 955) that:
Under worst case conditions of minimum fuel and worst attitude the pumps
must deliver 125% of the max demanded by the engine.
Has someone been fiddling or not doing the test corrrectly?
Dave Simpson
-----Original Message-----
From: ami mcfadyean <ami@mcfadyean.freeserve.co.uk>
<europa@avnet.co.uk>
Date: 25 August 2000 22:21
Subject: Re: Flying: Engine reliability
>
> Message is from
>Klaus Dietrich <Klaus.Dietrich@oracle.com
>
>***********************************************
>
>>>Alan,
>
>I experienced very similar engine cough/stutter
>
> the
>fuel pressure as generated by the mechanical pump is on the low side
>
>All the best
>Klaus<<
>
>Not forgetting that the pump has to suck fuel in before it is able to blow
>it out.
>Gravity fuel flow measured from the floor mounted fuel valve is down to
>about 3gph with 1/4 gallon left in the tank; the point being that with the
>further head losses between the valve and the (mechanical) pump, the pump
is
>having to suck quite hard. The return line just adds to the overall head
>losses.
>
>
>Duncan McFadyean
>
>
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