Does size really matter?

[Scott Aldrich]

No this is not SPAM for pitot tube enlargement.

Does the diameter of the pitot and static hook up lines really matter? I
want to use a fairly small diameter to get through a tight spot. It seems
to me that since it is just pressure it really shouldn't matter what size
they are?? Yes, no, thoughts?

Thanks

Scott
Moose 174




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[Bob Patterson]

Hi Scott !

You ARE running the lines down inside the wing strut AREN'T YOU !??
It's MUCH easier to hook up that way ....

I wouldn't want to go any smaller diameter than what's needed to
connect to the instrument (1/4" ??) - probably not good to go small &
then large again. The pressures we're measuring are pretty small,
and I would think wall friction could be a factor in a very small tube.
Technically, you're right - the pressure will equalize - but there could
be an unacceptable delay while this happens. ;-) :-)
Static is particulary sensitive to this effect.

I have had good results going from 5/16" at the pitot, down to 1/4"
inside .... but not smaller, and never up in diameter again.

......bobp

-------------------------------orig.-------------------------
On Wednesday 01 September 2004 11:10 am, Scott Aldrich wrote:

No this is not SPAM for pitot tube enlargement.

Does the diameter of the pitot and static hook up lines really matter? I
want to use a fairly small diameter to get through a tight spot. It seems
to me that since it is just pressure it really shouldn't matter what size
they are?? Yes, no, thoughts?

Thanks

Scott
Moose 174




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[Reed Britt Civ OO-ALC/MAD]

Scott - There was some good discussion about the same thing relative to "ram
air" pressurization of the fuel tank vents - I thing that pressure drop is
not an issue if there is no flow -

Britt SR194

Hi Scott !

You ARE running the lines down inside the wing strut AREN'T YOU !??
It's MUCH easier to hook up that way ....

I wouldn't want to go any smaller diameter than what's needed to
connect to the instrument (1/4" ??) - probably not good to go small &
then large again. The pressures we're measuring are pretty small,
and I would think wall friction could be a factor in a very small tube.
Technically, you're right - the pressure will equalize - but there could
be an unacceptable delay while this happens. ;-) :-)
Static is particulary sensitive to this effect.

I have had good results going from 5/16" at the pitot, down to 1/4"
inside .... but not smaller, and never up in diameter again.

......bobp

-------------------------------orig.-------------------------
On Wednesday 01 September 2004 11:10 am, Scott Aldrich wrote:

No this is not SPAM for pitot tube enlargement.

Does the diameter of the pitot and static hook up lines really matter? I
want to use a fairly small diameter to get through a tight spot. It seems
to me that since it is just pressure it really shouldn't matter what size
they are?? Yes, no, thoughts?

Thanks

Scott
Moose 174

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[Scott Aldrich]

I wasn't planning on the wing strut route but I may have to consider that.
On mine there is a space above the strut attach point that looks like the
hose would fit through.

Scott

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Bob
Patterson
Sent: Wednesday, September 01, 2004 9:31 AM
To: rebel-builders@dcsol.com
Subject: Re: Does size really matter?


Hi Scott !

You ARE running the lines down inside the wing strut AREN'T YOU !??
It's MUCH easier to hook up that way ....

I wouldn't want to go any smaller diameter than what's needed to
connect to the instrument (1/4" ??) - probably not good to go small &
then large again. The pressures we're measuring are pretty small,
and I would think wall friction could be a factor in a very small tube.
Technically, you're right - the pressure will equalize - but there could
be an unacceptable delay while this happens. ;-) :-)
Static is particulary sensitive to this effect.

I have had good results going from 5/16" at the pitot, down to 1/4"
inside .... but not smaller, and never up in diameter again.

......bobp

-------------------------------orig.-------------------------
On Wednesday 01 September 2004 11:10 am, Scott Aldrich wrote:

No this is not SPAM for pitot tube enlargement.

Does the diameter of the pitot and static hook up lines really matter? I
want to use a fairly small diameter to get through a tight spot. It seems
to me that since it is just pressure it really shouldn't matter what size
they are?? Yes, no, thoughts?

Thanks

Scott
Moose 174




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[Bob Patterson]

Hi Scott !

There are several reasons for running wiring & plumbing down
the wing strut - the best is that everything then enters the fuselage at
the bottom side, and is easy to run up behind the panel. There's NO
easy way to get wiring, etc. DOWN from the wing root to behind
the panel .... All you need are quick-connects at both ends of the
strut, for easy de-rigging (these are available for pitot lines from
most glider supply houses, and trailer connectors will do for electric).

Just a suggestion - hope it helps .... :-)

......bobp

-------------------------------orig.-------------------------
On Wednesday 01 September 2004 02:51 pm, Scott Aldrich wrote:

I wasn't planning on the wing strut route but I may have to consider that.
On mine there is a space above the strut attach point that looks like the
hose would fit through.

Scott

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Bob
Patterson
Sent: Wednesday, September 01, 2004 9:31 AM
To: rebel-builders@dcsol.com
Subject: Re: Does size really matter?


Hi Scott !

You ARE running the lines down inside the wing strut AREN'T YOU !??
It's MUCH easier to hook up that way ....

I wouldn't want to go any smaller diameter than what's needed to
connect to the instrument (1/4" ??) - probably not good to go small &
then large again. The pressures we're measuring are pretty small,
and I would think wall friction could be a factor in a very small tube.
Technically, you're right - the pressure will equalize - but there could
be an unacceptable delay while this happens. ;-) :-)
Static is particulary sensitive to this effect.

I have had good results going from 5/16" at the pitot, down to 1/4"
inside .... but not smaller, and never up in diameter again.

......bobp

-------------------------------orig.-------------------------
On Wednesday 01 September 2004 11:10 am, Scott Aldrich wrote:

No this is not SPAM for pitot tube enlargement.

Does the diameter of the pitot and static hook up lines really matter? I
want to use a fairly small diameter to get through a tight spot. It seems
to me that since it is just pressure it really shouldn't matter what size
they are?? Yes, no, thoughts?

Thanks

Scott
Moose 174




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List administrator: mike.davis@dcsol.com
-----------------------------------------------------

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