The Murphy Builders Site

Now realizing that MAM standard pitot is straight it, and others have made
their own straight in pitots, I'm feeling more inclined to do this -- it is
simpler. Doing the bottom skin L shaped pitot would mean (for me) adding the
W-601 doubler and inspection ports (at strut attach bottom of wing), which
I'm sort of wanting to avoid. However, maybe it's worth it -- I think I
recall someone here saying that annual strut bolt inspection was required
either by Canada or FAA. Correct? or my imagination? I personally feel
comfortable those painted bolts/nylocks are never going to budge.

Also, on the W601 doubler why does MAM call out 4 3/4" hole in the doubler
and 3 1/2" hole in the skin? I'm assuming the doubler is on the outside of
the skin. Is this so that the hole cover is to be a 4 3/4" cap that fits just
inside the doubler hole on top of the rim of the underlying main skin hole?
-Ben




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Hi Ben !

Maybe the old file wasn't descriptive enough .... my pitot tube
was NOT "L" shaped ! It was a straight 5/16" ID pipe that was
fastened to the bottom of the wing by 2 alum. 'straps' - about
1/2" wide strips of .020 or .025 that rivetted to the bottom skin,
came down, wrapped around the tube, and went back up and
fastened to the skin on the opposite side.

Front view........

--|--|--- --|---|---
| |
| |
| |
( O )
---
Side view........
___ ___
| | | |
| | | |
| | | |
_____|__|____________|__|__________________________
|_____|__|____________|__|__________________________|
^
|
|--- The plastic line was just slipped over the back end of the pipe.

Static was just cabin pressure - tried external static ports,
but none worked properly, so just cut the static line inside the
cockpit. I think Wayne did the same ....

This tube could also be fastened to the strut fairing, if you
use the metal fairings - makes it easy to bring the plastic line
up through the strut & fairing & connect to the end of the tube.
Never had a problem with water, even in heavy rain - there's
negligible FLOW through the tube - it just measures pressure.
The larger diameter worked MUCH better for the Rebel's
large range of angles of attack ! :-)

.....bobp

-------------------------------orig.-------------------------
On Thursday 28 July 2005 04:07 pm, bransom@dcsol.com wrote:

Now realizing that MAM standard pitot is straight it, and others have made
their own straight in pitots, I'm feeling more inclined to do this -- it is
simpler. Doing the bottom skin L shaped pitot would mean (for me) adding

the

W-601 doubler and inspection ports (at strut attach bottom of wing), which
I'm sort of wanting to avoid. However, maybe it's worth it -- I think I
recall someone here saying that annual strut bolt inspection was required
either by Canada or FAA. Correct? or my imagination? I personally feel
comfortable those painted bolts/nylocks are never going to budge.

Also, on the W601 doubler why does MAM call out 4 3/4" hole in the doubler
and 3 1/2" hole in the skin? I'm assuming the doubler is on the outside of
the skin. Is this so that the hole cover is to be a 4 3/4" cap that fits

just

inside the doubler hole on top of the rim of the underlying main skin hole?
-Ben




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Just re-sent ---- trying to fix the spacing below.
It's hard to draw in ASCII !! ;-)

-------------------------------orig.-------------------------
On Tuesday 02 August 2005 06:42 pm, Bob Patterson wrote:

Hi Ben !

Maybe the old file wasn't descriptive enough .... my pitot tube
was NOT "L" shaped ! It was a straight 5/16" ID pipe that was
fastened to the bottom of the wing by 2 alum. 'straps' - about
1/2" wide strips of .020 or .025 that rivetted to the bottom skin,
came down, wrapped around the tube, and went back up and
fastened to the skin on the opposite side.

Front view........

--|--|--- --|---|---
| |
| |
| |
( O )
---
Side view........
____ ____
| | | |
| | | |
| | | |
_____|__|____________|__|__________________________
|_____|__|____________|__|__________________________|
^
|
|--- The plastic line was just slipped over the back end of the pipe.

Static was just cabin pressure - tried external static ports,
but none worked properly, so just cut the static line inside the
cockpit. I think Wayne did the same ....

This tube could also be fastened to the strut fairing, if you
use the metal fairings - makes it easy to bring the plastic line
up through the strut & fairing & connect to the end of the tube.
Never had a problem with water, even in heavy rain - there's
negligible FLOW through the tube - it just measures pressure.
The larger diameter worked MUCH better for the Rebel's
large range of angles of attack ! :-)

.....bobp

-------------------------------orig.-------------------------
On Thursday 28 July 2005 04:07 pm, bransom@dcsol.com wrote:

Now realizing that MAM standard pitot is straight it, and others have made
their own straight in pitots, I'm feeling more inclined to do this -- it

is

simpler. Doing the bottom skin L shaped pitot would mean (for me) adding

the

W-601 doubler and inspection ports (at strut attach bottom of wing), which
I'm sort of wanting to avoid. However, maybe it's worth it -- I think I
recall someone here saying that annual strut bolt inspection was required
either by Canada or FAA. Correct? or my imagination? I personally feel
comfortable those painted bolts/nylocks are never going to budge.

Also, on the W601 doubler why does MAM call out 4 3/4" hole in the doubler
and 3 1/2" hole in the skin? I'm assuming the doubler is on the outside of
the skin. Is this so that the hole cover is to be a 4 3/4" cap that fits

just

inside the doubler hole on top of the rim of the underlying main skin

hole?

-Ben




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Bob, thanks for the help -- drawing in ASCII is above and beyond the call! :)
Although I decided on the simple approach of just using a straight tube
(5/16), I also decided to go ahead and put in the inspection ports (and W601)
at the lift struts a la current MAM.

BTW, I do not see what you mention as "the old file". Not sure what that
was. There are several references in the archives to pictures in the Files
Section of this list, but those pics unfortunately gone.

In any case, this issue is resolved for me. Thanks a lot,
-Ben

Just re-sent ---- trying to fix the spacing below.
It's hard to draw in ASCII !! ;-)

-------------------------------orig.-------------------------
On Tuesday 02 August 2005 06:42 pm, Bob Patterson wrote:

Hi Ben !

Maybe the old file wasn't descriptive enough .... my pitot tube
was NOT "L" shaped ! It was a straight 5/16" ID pipe that was
fastened to the bottom of the wing by 2 alum. 'straps' - about
1/2" wide strips of .020 or .025 that rivetted to the bottom skin,
came down, wrapped around the tube, and went back up and
fastened to the skin on the opposite side.

Front view........

--|--|--- --|---|---
| |
| |
| |
( O )
---
Side view........
____ ____
| | | |
| | | |
| | | |
_____|__|____________|__|__________________________
|_____|__|____________|__|__________________________|
^
|
|--- The plastic line was just slipped over the back end of the pipe.

Static was just cabin pressure - tried external static ports,
but none worked properly, so just cut the static line inside the
cockpit. I think Wayne did the same ....

This tube could also be fastened to the strut fairing, if you
use the metal fairings - makes it easy to bring the plastic line
up through the strut & fairing & connect to the end of the tube.
Never had a problem with water, even in heavy rain - there's
negligible FLOW through the tube - it just measures pressure.
The larger diameter worked MUCH better for the Rebel's
large range of angles of attack ! :-)

.....bobp

-------------------------------orig.-------------------------
On Thursday 28 July 2005 04:07 pm, bransom@dcsol.com wrote:

Now realizing that MAM standard pitot is straight it, and others have

made

their own straight in pitots, I'm feeling more inclined to do this --

it

is

simpler. Doing the bottom skin L shaped pitot would mean (for me)

adding

the

W-601 doubler and inspection ports (at strut attach bottom of wing),

which

I'm sort of wanting to avoid. However, maybe it's worth it -- I think

I

recall someone here saying that annual strut bolt inspection was

required

either by Canada or FAA. Correct? or my imagination? I personally

feel

comfortable those painted bolts/nylocks are never going to budge.

Also, on the W601 doubler why does MAM call out 4 3/4" hole in the

doubler

and 3 1/2" hole in the skin? I'm assuming the doubler is on the outside

of

the skin. Is this so that the hole cover is to be a 4 3/4" cap that

fits

just

inside the doubler hole on top of the rim of the underlying main skin

hole?

-Ben




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