Re: Pitot/static tube fabrication

Ranchaero Wing Shop · Post by **Ranchaero Wing Shop** » Thu Jul 25, 2019 3:53 pm

'My pitot tube was seriously trashed, so after determining that finding a
replacement was futile, I set about to make a new one. Nothing too
challenging here, except...those (damn) 6 tiny little slots (static
openings) in the rear section of the forwardmost 1/2" tube which is the
static section of the tube. I hoped my machinist would have a good
answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
circumference of the tube just aft of halfway back. A hacksaw blade just
won't do a pretty job. I imagine maybe they were originally stamped. My
water jet guy says his water jet is too brutal for such fine work.

I suspect there's nothing magic about them, it's just static port. But
they've gotta be pretty and look like the originals. One could probably
drill a few little holes and achieve the same result, but 1st I need to
exhaust all resources for doing an identical reproduction.

Can anyone offer a creative possible solution?

David'

Stuart Burgess · Post by **Stuart Burgess** » Fri Jul 26, 2019 2:37 am

'Hi David
I had a similar problem so I got new brass tube for the body and new 1/4 inch copper tube for the static and dynamic pipes. I then disassembled my old pitot discarding the pipework and reassembled the hardware like to nose cone and the pitot itself onto the new pipes finally soldering it all back into a new body tube. Worked great.
What is the condition of those bits like the shroud that you are trying to remanufacture.
Cheers
Stuart

On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:

My pitot tube was seriously trashed, so after determining that finding a
replacement was futile, I set about to make a new one. Nothing too
challenging here, except...those (damn) 6 tiny little slots (static
openings) in the rear section of the forwardmost 1/2" tube which is the
static section of the tube. I hoped my machinist would have a good
answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
circumference of the tube just aft of halfway back. A hacksaw blade just
won't do a pretty job. I imagine maybe they were originally stamped. My
water jet guy says his water jet is too brutal for such fine work.

I suspect there's nothing magic about them, it's just static port. But
they've gotta be pretty and look like the originals. One could probably
drill a few little holes and achieve the same result, but 1st I need to
exhaust all resources for doing an identical reproduction.

Can anyone offer a creative possible solution?

David

--
Kind regards
Stuart Burgess
Cell: 0711998012Email: stuart@burgess.org.za '

Ranchaero Wing Shop · Post by **Ranchaero Wing Shop** » Fri Jul 26, 2019 9:55 am

' Thanks for your reply, Stuart. Unfortunately, the 1/2" brass tube shroud was also trashed by the mechanic I took over this project from who did a poor job of separating it from the tubes. But that's ok - I enjoy the experience.

Since I posted my last message, my machinist tells me he can make those slots with a tiny (1/32") end mill, and a little filing to square off the ends of the slots with a jewelers file. So he will be doing that part for me, except the filing.

I believe the entire assembly is finally nickel plated. I am studying this process now at Youtube University. Doesn't look too difficult...

David

On 7/26/19 1:16 AM, Stuart Burgess stuart@burgess.org.za [fairchildclub] wrote:

Hi David
I had a similar problem so I got new brass tube for the body and new 1/4 inch copper tube for the static and dynamic pipes. I then disassembled my old pitot discarding the pipework and reassembled the hardware like to nose cone and the pitot itself onto the new pipes finally soldering it all back into a new body tube. Worked great.
What is the condition of those bits like the shroud that you are trying to remanufacture.
Cheers
Stuart
On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:

My pitot tube was seriously trashed, so after determining that finding a
replacement was futile, I set about to make a new one. Nothing too
challenging here, except...those (damn) 6 tiny little slots (static
openings) in the rear section of the forwardmost 1/2" tube which is the
static section of the tube. I hoped my machinist would have a good
answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
circumference of the tube just aft of halfway back. A hacksaw blade just
won't do a pretty job. I imagine maybe they were originally stamped. My
water jet guy says his water jet is too brutal for such fine work.

I suspect there's nothing magic about them, it's just static port. But
they've gotta be pretty and look like the originals. One could probably
drill a few little holes and achieve the same result, but 1st I need to
exhaust all resources for doing an identical reproduction.

Can anyone offer a creative possible solution?

David

--
Kind regards
Stuart Burgess
Cell: 0711998012 Email: stuart@burgess.org.za

'

Stuart Burgess · Post by **Stuart Burgess** » Mon Jul 29, 2019 12:17 am

'Hi David

Glad you have a plan! I started out with the bits that I salvaged and ended
up with a fully functional pitot. Could not find the thin walled brass tube
for the body but fortunately what I found was the right OD but with a
slightly thicker wall.

All that remains is to have it plated. Apologies for the poor second pic.
Only realised when I downloaded the pic that it had focused on the
background but you get the idea.

Stuart

On Fri, 26 Jul 2019 at 17:58, Ranchaero Wing Shop
david@ranchaerowingshop.com [fairchildclub]
wrote:

>
>
> Thanks for your reply, Stuart. Unfortunately, the 1/2" brass tube shroud
> was also trashed by the mechanic I took over this project from who did a
> poor job of separating it from the tubes. But that's ok - I enjoy the
> experience.
>
> Since I posted my last message, my machinist tells me he can make those
> slots with a tiny (1/32") end mill, and a little filing to square off the
> ends of the slots with a jewelers file. So he will be doing that part for
> me, except the filing.
>
> I believe the entire assembly is finally nickel plated. I am studying this
> process now at Youtube University. Doesn't look too difficult...
>
> David
>
>
> On 7/26/19 1:16 AM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> wrote:
>
>
> Hi David
>
> I had a similar problem so I got new brass tube for the body and new 1/4
> inch copper tube for the static and dynamic pipes. I then disassembled my
> old pitot discarding the pipework and reassembled the hardware like to nose
> cone and the pitot itself onto the new pipes finally soldering it all back
> into a new body tube. Worked great.
>
> What is the condition of those bits like the shroud that you are trying to
> remanufacture.
>
> Cheers
>
> Stuart
>
> On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop
> david@ranchaerowingshop.com [fairchildclub]
> wrote:
>
>>
>>
>> My pitot tube was seriously trashed, so after determining that finding a
>> replacement was futile, I set about to make a new one. Nothing too
>> challenging here, except...those (damn) 6 tiny little slots (static
>> openings) in the rear section of the forwardmost 1/2" tube which is the
>> static section of the tube. I hoped my machinist would have a good
>> answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
>> 1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
>> circumference of the tube just aft of halfway back. A hacksaw blade just
>> won't do a pretty job. I imagine maybe they were originally stamped. My
>> water jet guy says his water jet is too brutal for such fine work.
>>
>> I suspect there's nothing magic about them, it's just static port. But
>> they've gotta be pretty and look like the originals. One could probably
>> drill a few little holes and achieve the same result, but 1st I need to
>> exhaust all resources for doing an identical reproduction.
>>
>> Can anyone offer a creative possible solution?
>>
>> David
>>
>>
>
> --
> Kind regards
>
> *Stuart Burgess*
>
> *Cell: 0711998012*
> *Email: stuart@burgess.org.za *
>
>
>
>

--
Kind regards

*Stuart Burgess*

*Cell: 0711998012*
*Email: stuart@burgess.org.za *

[Non-text portions of this message have been removed]'

Ranchaero Wing Shop · Post by **Ranchaero Wing Shop** » Mon Jul 29, 2019 9:08 am

' Where I live here in California it's hard to find anyone doing plating anymore. Environmental regs I suspect. From watching Youtube videos, it doesn't seem like there's much to nickel plating. Make a non-conductive tank big enough to submerge the pitot tube, some chemical available on Amazon or you can make your own, some nickel electrode material, a small power supply. There's several Youtube videos demonstrating the process. I haven't tried it yet but I'm gathering up the materials.

Stuart, where can I see your pics? I didn't receive any. Did you send them to me or the list? I must've missed them somehow.

David

On 7/28/19 11:16 PM, Stuart Burgess stuart@burgess.org.za [fairchildclub] wrote:

Hi David

Glad you have a plan! I started out with the bits that I salvaged and ended
up with a fully functional pitot. Could not find the thin walled brass tube
for the body but fortunately what I found was the right OD but with a
slightly thicker wall.

All that remains is to have it plated. Apologies for the poor second pic.
Only realised when I downloaded the pic that it had focused on the
background but you get the idea.

Stuart

On Fri, 26 Jul 2019 at 17:58, Ranchaero Wing Shop
david@ranchaerowingshop.com [fairchildclub] fairchildclub@yahoogroups.com
wrote:

>
>
> Thanks for your reply, Stuart. Unfortunately, the 1/2" brass tube shroud
> was also trashed by the mechanic I took over this project from who did a
> poor job of separating it from the tubes. But that's ok - I enjoy the
> experience.
>
> Since I posted my last message, my machinist tells me he can make those
> slots with a tiny (1/32") end mill, and a little filing to square off the
> ends of the slots with a jewelers file. So he will be doing that part for
> me, except the filing.
>
> I believe the entire assembly is finally nickel plated. I am studying this
> process now at Youtube University. Doesn't look too difficult...
>
> David
>
>
> On 7/26/19 1:16 AM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> wrote:
>
>
> Hi David
>
> I had a similar problem so I got new brass tube for the body and new 1/4
> inch copper tube for the static and dynamic pipes. I then disassembled my
> old pitot discarding the pipework and reassembled the hardware like to nose
> cone and the pitot itself onto the new pipes finally soldering it all back
> into a new body tube. Worked great.
>
> What is the condition of those bits like the shroud that you are trying to
> remanufacture.
>
> Cheers
>
> Stuart
>
> On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop
> david@ranchaerowingshop.com [fairchildclub] fairchildclub@yahoogroups.com
> wrote:
>
>>
>>
>> My pitot tube was seriously trashed, so after determining that finding a
>> replacement was futile, I set about to make a new one. Nothing too
>> challenging here, except...those (damn) 6 tiny little slots (static
>> openings) in the rear section of the forwardmost 1/2" tube which is the
>> static section of the tube. I hoped my machinist would have a good
>> answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
>> 1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
>> circumference of the tube just aft of halfway back. A hacksaw blade just
>> won't do a pretty job. I imagine maybe they were originally stamped. My
>> water jet guy says his water jet is too brutal for such fine work.
>>
>> I suspect there's nothing magic about them, it's just static port. But
>> they've gotta be pretty and look like the originals. One could probably
>> drill a few little holes and achieve the same result, but 1st I need to
>> exhaust all resources for doing an identical reproduction.
>>
>> Can anyone offer a creative possible solution?
>>
>> David
>>
>>
>
> --
> Kind regards
>
> *Stuart Burgess*
>
> *Cell: 0711998012*
> *Email: stuart@burgess.org.za stuart@burgess.org.za*
>
>
>
>

--
Kind regards

*Stuart Burgess*

*Cell: 0711998012*
*Email: stuart@burgess.org.za stuart@burgess.org.za*

[Non-text portions of this message have been removed]

'

Stuart Burgess · Post by **Stuart Burgess** » Tue Jul 30, 2019 1:07 am

'Hi David

I dont often log on to the group but follow the emails so I sent by reply
to the email address |I received from. I have included your email address
here so lets see if this works.

Cheers

Stuart

On Mon, 29 Jul 2019 at 17:09, Ranchaero Wing Shop
david@ranchaerowingshop.com [fairchildclub]
wrote:

>
>
> Where I live here in California it's hard to find anyone doing plating
> anymore. Environmental regs I suspect. From watching Youtube videos, it
> doesn't seem like there's much to nickel plating. Make a non-conductive
> tank big enough to submerge the pitot tube, some chemical available on
> Amazon or you can make your own, some nickel electrode material, a small
> power supply. There's several Youtube videos demonstrating the process. I
> haven't tried it yet but I'm gathering up the materials.
>
> Stuart, where can I see your pics? I didn't receive any. Did you send them
> to me or the list? I must've missed them somehow.
>
> David
>
>
> On 7/28/19 11:16 PM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> wrote:
>
>
>
> Hi David
>
> Glad you have a plan! I started out with the bits that I salvaged and ended
> up with a fully functional pitot. Could not find the thin walled brass tube
> for the body but fortunately what I found was the right OD but with a
> slightly thicker wall.
>
> All that remains is to have it plated. Apologies for the poor second pic.
> Only realised when I downloaded the pic that it had focused on the
> background but you get the idea.
>
> Stuart
>
> On Fri, 26 Jul 2019 at 17:58, Ranchaero Wing Shop
> david@ranchaerowingshop.com [fairchildclub]
>
> wrote:
>
> >
> >
> > Thanks for your reply, Stuart. Unfortunately, the 1/2" brass tube shroud
> > was also trashed by the mechanic I took over this project from who did a
> > poor job of separating it from the tubes. But that's ok - I enjoy the
> > experience.
> >
> > Since I posted my last message, my machinist tells me he can make those
> > slots with a tiny (1/32") end mill, and a little filing to square off the
> > ends of the slots with a jewelers file. So he will be doing that part for
> > me, except the filing.
> >
> > I believe the entire assembly is finally nickel plated. I am studying
> this
> > process now at Youtube University. Doesn't look too difficult...
> >
> > David
> >
> >
> > On 7/26/19 1:16 AM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> > wrote:
> >
> >
> > Hi David
> >
> > I had a similar problem so I got new brass tube for the body and new 1/4
> > inch copper tube for the static and dynamic pipes. I then disassembled my
> > old pitot discarding the pipework and reassembled the hardware like to
> nose
> > cone and the pitot itself onto the new pipes finally soldering it all
> back
> > into a new body tube. Worked great.
> >
> > What is the condition of those bits like the shroud that you are trying
> to
> > remanufacture.
> >
> > Cheers
> >
> > Stuart
> >
> > On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop
> > david@ranchaerowingshop.com [fairchildclub]
>
> > wrote:
> >
> >>
> >>
> >> My pitot tube was seriously trashed, so after determining that finding a
> >> replacement was futile, I set about to make a new one. Nothing too
> >> challenging here, except...those (damn) 6 tiny little slots (static
> >> openings) in the rear section of the forwardmost 1/2" tube which is the
> >> static section of the tube. I hoped my machinist would have a good
> >> answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
> >> 1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
> >> circumference of the tube just aft of halfway back. A hacksaw blade just
> >> won't do a pretty job. I imagine maybe they were originally stamped. My
> >> water jet guy says his water jet is too brutal for such fine work.
> >>
> >> I suspect there's nothing magic about them, it's just static port. But
> >> they've gotta be pretty and look like the originals. One could probably
> >> drill a few little holes and achieve the same result, but 1st I need to
> >> exhaust all resources for doing an identical reproduction.
> >>
> >> Can anyone offer a creative possible solution?
> >>
> >> David
> >>
> >>
> >
> > --
> > Kind regards
> >
> > *Stuart Burgess*
> >
> > *Cell: 0711998012*
> > *Email: stuart@burgess.org.za
> *
> >
> >
> >
> >
>
> --
> Kind regards
>
> *Stuart Burgess*
>
> *Cell: 0711998012*
> *Email: stuart@burgess.org.za
> *
>
> [Non-text portions of this message have been removed]
>
>
>
>

--
Kind regards

*Stuart Burgess*

*Cell: 0711998012*
*Email: stuart@burgess.org.za *

[Non-text portions of this message have been removed]'

robert Etter · Post by **robert Etter** » Wed Jul 31, 2019 12:24 am

' I think that I saw someone mentioned drilling tiny holes all the way through the static line. I think that mine had two sets of holes, maybe 1/4" apart, front to back and rotated 90 deg. apart. The end was plugged with a soft rivet turned down to match the tube diameter. I used the smallest drill bit that I could find. I didn't know it at the time, mine was home made.

On ?Tuesday?, ?July? ?30?, ?2019? ?12?:?09?:?55? ?AM? ?PDT, Stuart Burgess stuart@burgess.org.za [fairchildclub] wrote:

Hi David

I dont often log on to the group but follow the emails so I sent by reply
to the email address |I received from. I have included your email address
here so lets see if this works.

Cheers

Stuart

On Mon, 29 Jul 2019 at 17:09, Ranchaero Wing Shop
david@ranchaerowingshop.com [fairchildclub]
wrote:

>
>
> Where I live here in California it's hard to find anyone doing plating
> anymore. Environmental regs I suspect. From watching Youtube videos, it
> doesn't seem like there's much to nickel plating. Make a non-conductive
> tank big enough to submerge the pitot tube, some chemical available on
> Amazon or you can make your own, some nickel electrode material, a small
> power supply. There's several Youtube videos demonstrating the process. I
> haven't tried it yet but I'm gathering up the materials.
>
> Stuart, where can I see your pics? I didn't receive any. Did you send them
> to me or the list? I must've missed them somehow.
>
> David
>
>
> On 7/28/19 11:16 PM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> wrote:
>
>
>
> Hi David
>
> Glad you have a plan! I started out with the bits that I salvaged and ended
> up with a fully functional pitot. Could not find the thin walled brass tube
> for the body but fortunately what I found was the right OD but with a
> slightly thicker wall.
>
> All that remains is to have it plated. Apologies for the poor second pic.
> Only realised when I downloaded the pic that it had focused on the
> background but you get the idea.
>
> Stuart
>
> On Fri, 26 Jul 2019 at 17:58, Ranchaero Wing Shop
> david@ranchaerowingshop.com [fairchildclub]
>
> wrote:
>
> >
> >
> > Thanks for your reply, Stuart. Unfortunately, the 1/2" brass tube shroud
> > was also trashed by the mechanic I took over this project from who did a
> > poor job of separating it from the tubes. But that's ok - I enjoy the
> > experience.
> >
> > Since I posted my last message, my machinist tells me he can make those
> > slots with a tiny (1/32") end mill, and a little filing to square off the
> > ends of the slots with a jewelers file. So he will be doing that part for
> > me, except the filing.
> >
> > I believe the entire assembly is finally nickel plated. I am studying
> this
> > process now at Youtube University. Doesn't look too difficult...
> >
> > David
> >
> >
> > On 7/26/19 1:16 AM, Stuart Burgess stuart@burgess.org.za [fairchildclub]
> > wrote:
> >
> >
> > Hi David
> >
> > I had a similar problem so I got new brass tube for the body and new 1/4
> > inch copper tube for the static and dynamic pipes. I then disassembled my
> > old pitot discarding the pipework and reassembled the hardware like to
> nose
> > cone and the pitot itself onto the new pipes finally soldering it all
> back
> > into a new body tube. Worked great.
> >
> > What is the condition of those bits like the shroud that you are trying
> to
> > remanufacture.
> >
> > Cheers
> >
> > Stuart
> >
> > On Thu, 25 Jul 2019 at 23:58, Ranchaero Wing Shop
> > david@ranchaerowingshop.com [fairchildclub]
>
> > wrote:
> >
> >>
> >>
> >> My pitot tube was seriously trashed, so after determining that finding a
> >> replacement was futile, I set about to make a new one. Nothing too
> >> challenging here, except...those (damn) 6 tiny little slots (static
> >> openings) in the rear section of the forwardmost 1/2" tube which is the
> >> static section of the tube. I hoped my machinist would have a good
> >> answer, but not so, yet. He's stumped too. How to cut those 6 tiny slots
> >> 1/4" long, about .030 wide, 2 rows of 3 slots spaced evenly around the
> >> circumference of the tube just aft of halfway back. A hacksaw blade just
> >> won't do a pretty job. I imagine maybe they were originally stamped. My
> >> water jet guy says his water jet is too brutal for such fine work.
> >>
> >> I suspect there's nothing magic about them, it's just static port. But
> >> they've gotta be pretty and look like the originals. One could probably
> >> drill a few little holes and achieve the same result, but 1st I need to
> >> exhaust all resources for doing an identical reproduction.
> >>
> >> Can anyone offer a creative possible solution?
> >>
> >> David
> >>
> >>
> >
> > --
> > Kind regards
> >
> > *Stuart Burgess*
> >
> > *Cell: 0711998012*
> > *Email: stuart@burgess.org.za
> *
> >
> >
> >
> >
>
> --
> Kind regards
>
> *Stuart Burgess*
>
> *Cell: 0711998012*
> *Email: stuart@burgess.org.za
> *
>
> [Non-text portions of this message have been removed]
>
>
>
>

--
Kind regards

*Stuart Burgess*

*Cell: 0711998012*
*Email: stuart@burgess.org.za *

[Non-text portions of this message have been removed]

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Craig · Post by **Craig** » Sun Aug 04, 2019 4:48 am

'David: If you are still workings on this, might be worth looking at MSC
for a 1" jeweler's saw with the correct blade width. I know that they
come down as thin as .010".

Craig

Fairchild AT-21'

Ranchaero Wing Shop · Sun Aug 04, 2019 10:21 am

' Craig, Thanks for your suggestion. I found those 1" dia. jewelers saw blade at MSC. As you suggest, it could be done with a tiny jewelers saw in a milling machine. Or maybe I could even do it using my drill press. My machinist wants to cut those tiny slots on his CNC milling machine and a .032 end cutter. I think I'll let my machinist do this one just to get it done. Then I'm going to experiment with a 1" saw and my drill press. Good idea! Thanks!

David

On 8/4/19 3:48 AM, Craig cvcantwell@verizon.net [fairchildclub] wrote:

David: If you are still workings on this, might be worth looking at MSC
for a 1" jeweler's saw with the correct blade width. I know that they
come down as thin as .010".

Craig

Fairchild AT-21

'

Craig · Post by **Craig** » Sun Aug 04, 2019 12:04 pm

'
David: Good deal. Make sure you take some photos as things are laid out and going back together. Photos and some descriptions as things progress ( good or bad) are worth a lot to?? helping anyone else that needs to make one.

Craig
Fairchild AT-21
On 8/4/19 10:51 AM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:

??
Craig, Thanks for your suggestion. I found those 1" dia. jewelers saw blade at MSC.?? As you suggest, it could be done with a tiny jewelers saw in a milling machine. Or maybe I could even do it using my drill press. My machinist wants to cut those tiny slots on his CNC milling machine and a .032 end cutter.?? I think I'll let my machinist do this one just to get it done. Then I'm going to experiment with a 1" saw and my drill press. Good idea! Thanks!

David

On 8/4/19 3:48 AM, Craig cvcantwell@verizon.net [fairchildclub] wrote:
??
David: If you are still workings on this, might be worth looking at MSC
for a 1" jeweler's saw with the correct blade width. I know that they
come down as thin as .010".

Craig

Fairchild AT-21

'