Cheers,
Lance's message below reminded me that we had discussed cockpit
versus aft fuse pressures before. It has been almost unanimous that it's
higher out back than in front. HOWEVER, have we measured the two pressures
against ambient ouside? maybe cockpit is lower than ambient, perhaps afte is
higher than ambient - perhaps they are either side of ambient- or both over
- or under?
It seems to me that we should establish which is who, and then
decide what to use in the discussion. Open to Flames.......
Ferg C-FFGG
still in the hangar
In OZ, in the strictly controlled era prior to experimental regulations,
(pre 1999). Our Civil aviation released an Airworthiness Directive for
Europa Aircraft stating there should be no airflow between the cockpit and
the rear fuselage. Their concern was, with the pressure rear of the bulkhead
being higher than the cockpit, engine exhaust could be drawn into the rear
fuselage via the flap slots and find its way into the cockpit. This AD was
withdrawn with the advent of experimental aviation with responsibility being
handed to the builder. Sorry I cant find the copy I thought I had.
Regards
Lance Sandford in OZ
On 14/05/14 03:49, Frans Veldman wrote:
>
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> On 05/13/2014 12:07 AM, Tony Renshaw wrote:
>> <tonyrenshaw268@gmail.com>
>>
>> Hi Fran's, I expect the pressure in the aft fuselage might be more
>> representative than cockpit pressure,
> Not in my airplane. In my airplane the aft fuselage seems to be of
> higher pressure than the cockpit. I installed a vent in the D-panel
> with the intention to let the air out, but it is blowing into the
> cockpit instead! I have no idea where the air is leaving again as
> every opening in the cockpit seems to be blowing inward (and yes my
> doors are sealed with a center pin arrangement). Also I don't
> understand why the aft fuselage is pressurised. The main openings in
> the aft fuselage are the tailplane drive slots but it looks to me they
> are in a low pressure area. The slots for the flap drive are covered
> by the wing root fairings so they are normally sealed in flight. The
> only other openings are the small openings for the rudder cable and
> one small opening in the sternpost for the rudder drive rod.
>
>> Believe it or not I have this Nylaflow? Tubing, the hard walled
>> opaque stuff from ACS, and it makes an excellent push to fit. I am
>> tempted to use the 3/8" OD inside a 3/8" ID joiner, and just push
>> them together. Very un-aviation, but if you've ever done it, you'll
>> appreciate how hard they are to pull apart, and no vibration is
>> going to do it.
> I have used this equipment to plumb my entire pitot/static system.
> Only for the wing to fuselage connection I use the "official" quick
> (dis)connect fittings. I agree that it is great stuff.
>
> Frans
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