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tonyrenshaw268(at)gmail.c
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 Posted: Mon May 12, 2014 11:51 am Post subject: Airspeed static ports. |
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Gidday,
I am considering how I will quick connect my pitot dynamic and static tubes from my wing root to the fuselage and am considering quick connects/disconnects. In the process of this investigation, I have wondered whether I could take a rear fuselage "internal" static pressure as well as the pitot, in case hypothetically it ever got blocked, but without any switching, just melding the two. I would think the worst case would be where cabin static could create a false reading on a rapid climb out, where the static could lag due to a greater pressure from an internal contribution, which would indicate you are flying slower than you actually are, which is safe. Seems to me since most light a/c leak like sieves, and our rear fuselage more so because of flap drive slots into wing root close out voids, that I could use this to my advantage.
Comments??
Regards
Tony Renshaw
P.S. I was inspired by these fittings:
Sent from my iPad
<pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">
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frans(at)privatepilots.nl
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| Posted: Mon May 12, 2014 12:35 pm Post subject: Airspeed static ports. |
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 05/12/2014 09:46 PM, Tony Renshaw wrote:
| Quote: | Gidday, I am considering how I will quick connect my pitot dynamic
and static tubes from my wing root to the fuselage and am
considering quick connects/disconnects.
|
I use the ones in your picture, but not for quick disconnects. I think
they are not really suitable for repeatable connections and they are
sometimes difficult to let go.
| Quote: | In the process of this investigation, I have wondered whether I
could take a rear fuselage "internal" static pressure as well as
the pitot,
|
I have a static tube connector in the instrument panel with a blocked
piece of tubing in it. If I pull it out, I have static pressure from
the cockpit (in parallel to the static port in the wing). This works
very well. In fact, it works so well that I hardly see any difference
if I take the blockage out. (And yes, my static port system is leak
free). Unless I open one of the big vents in the door windows, then
the static pressure goes way off. But of course cockpit pressure is
very dependant on how tight your doors are, how much air leaks around
the throttle, etc. In my case it just happens that the cockpit
pressure is very neutral.
Frans
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tonyrenshaw268(at)gmail.c
Guest
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| Posted: Mon May 12, 2014 2:10 pm Post subject: Airspeed static ports. |
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Hi Fran's,
I expect the pressure in the aft fuselage might be more representative than cockpit pressure, which is why my plan was to pick it up back behind the baggage bay, near the flap cross tube. I have wondered about plumbing a standby pitot static to the cockpit, but have wondered if I can make it a split system static. We have a similar system with multiple statics for the one system on bigger aircraft, albeit they measure ambient, for obvious reasons.
These fittings do work well though in my superficial testing, and leak of static from the fitting is a bit of an irrelevance, since we are talking about more a static equalization pressure tube more than anything. 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.
Regards
Tony Renshaw
Sent from my iPad
| Quote: | On 12 May 2014, at 1:22 pm, Frans Veldman <frans(at)privatepilots.nl> wrote:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
> On 05/12/2014 09:46 PM, Tony Renshaw wrote:
> Gidday, I am considering how I will quick connect my pitot dynamic
> and static tubes from my wing root to the fuselage and am
> considering quick connects/disconnects.
I use the ones in your picture, but not for quick disconnects. I think
they are not really suitable for repeatable connections and they are
sometimes difficult to let go.
> In the process of this investigation, I have wondered whether I
> could take a rear fuselage "internal" static pressure as well as
> the pitot,
I have a static tube connector in the instrument panel with a blocked
piece of tubing in it. If I pull it out, I have static pressure from
the cockpit (in parallel to the static port in the wing). This works
very well. In fact, it works so well that I hardly see any difference
if I take the blockage out. (And yes, my static port system is leak
free). Unless I open one of the big vents in the door windows, then
the static pressure goes way off. But of course cockpit pressure is
very dependant on how tight your doors are, how much air leaks around
the throttle, etc. In my case it just happens that the cockpit
pressure is very neutral.
Frans
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|
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rparigoris
Joined: 24 Nov 2009
Posts: 791
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| Posted: Mon May 12, 2014 2:36 pm Post subject: Airspeed static ports. |
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Hi Tony
Have a look at Winter connectors that I am using at instrument module, also see the pneumatic switches I am using for switch between static and cockpit and switch between static and TE for variometer:
http://www.europaowners.org/main.php?g2_itemId=27305&g2_page=2
Also have a look at my mutilated Winter connector, Sermos (very close to Anderson power pole modular connectors) connector and plastic buckle that melded into a one connector solution for wing to fuse:
http://www.europaowners.org/main.php?g2_itemId=86942
Ron Parigoris
[quote][b]
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frans(at)privatepilots.nl
Guest
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| Posted: Tue May 13, 2014 9:57 am Post subject: Airspeed static ports. |
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 05/13/2014 12:07 AM, Tony Renshaw wrote:
| Quote: |
<tonyrenshaw268(at)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.
| Quote: | 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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europa471
Joined: 08 Apr 2009
Posts: 35
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| Posted: Fri May 16, 2014 10:02 pm Post subject: Airspeed static ports. |
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Tony, Frans and All
Sorry to be late getting to this, I have been out of commission for a while.
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 itīs way into the
cockpit. This AD was withdrawn with the advent of experimental aviation
with responsibility being handed to the builder. Sorry I canīt find the
copy I thought I had.
Regards
Lance Sandford in OZ
On 14/05/14 03:49, Frans Veldman wrote:
| Quote: |
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 05/13/2014 12:07 AM, Tony Renshaw wrote:
>
> <tonyrenshaw268(at)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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