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carlossa52(at)gmail.com
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 Posted: Mon Dec 20, 2010 2:31 pm Post subject: Fwd: Hartwell latch |
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Below is a summary of what I learned during the intalation of the Hartwell latches.
It's a note I sent to some builders that were interested in this set up.
Carlos
________________
To operate the latches, you will need to apply a force perpendicular to the skin, so the skin
and the area around it must be able to take the stress. My locker cover is 0.020" - I should have used 0.025", but I think it will survive. If not, it should be a matter of hours to make another one with thicker material.
New latches are a bit stiff, so I operated each one a number of times until they became easier
to work with - before I ever installed them in their "final resting place".
They open with a jolt, so they can damage the skin when they reach fully open position. The
damage is visible on the picture of the hole patters. One of them shows some deformation (3rd from left, on top). So, to fix the problem, I made a "cage", or travel stop, to make sure the latch stops before denting the skin. This is the purpose of those funny "match boxes" you see.
I learned *after* purchasing these latches that there is an model with travel limited to 90 degrees ...
Should you decide to use Hartwell latches, look for this particular model. See page 2 of the AS&S specs at http://www.aircraftspruce.com/catalog/appages/hartwell.pdf
I think this would be an H5000-3.
I used H5000-2-025-051, where 025 is the door thickness, and 051 is door plus frame thickness (the "limited travel" version would be H5000-3-025-051).
In my case they are both 0.020 and it fits well.
I got them from aviation-instrument.com , a gentleman named Chuck Gonzales -
mailto: cgonzalez(at)aviation-instrument.com (cgonzalez(at)aviation-instrument.com)
Great people to work with.
They were "surplus new", $10.00 each - that was a year ago, not sure if they have any left...
Hartwell wanted $100 each - they would manufacture them, as they have none in stock ...!!!
Wicks sells them at $10 each. I asked the complete part number (not shown on-line), and they are for thicker material - you might want to inquire and/or order a sample to see if it fits.
http://www.wicksaircraft.com/catalog/product_detail.php/pid=5075~subid=1456/index.html
There is also the "helicopter" variation, which would have been easier to install (round
holes), but the only source I found wanted $50/each.
http://www.crracing.com/custom_built/hartwell_styles.shtml
I think it deserves a little more searching, as it would save the time and effort of making irregular shaped holes.
If you decide against Hartwell latches, I would suggest camlock fasteners - more expensive than dzus, but, in my opinion, a better engineered solution: http://www.milspecproducts.com/
About the pictures:
I made hole patterns, starting with cardboard and then making them a bit better (on 0.016"),
until I was happy. I used the one to the right to trace the hole shape on the door, then
drilled small holes all around and shaped with a file.
The travel stop / cage was made of thin stock (0.020"?), and then a trapezoidal piece (0.032")
riveted inside (see sample next to the hole templates).
One more consideration (?): a Hartwell latch installation will be more permeable to air and water - there are more ways for the water to pass through, if compared to a dzu or camlock. But, for a "high performance" craft as the Zodie, I think this is no issue...
I posted a video on youtube, and when I went there to see it, I found one more on hartwell latches.
Here are the URLs:
http://www.youtube.com/watch?v=IGtyj-jPIb0
This is my video:
http://www.youtube.com/watch?v=evD30x62UwU
There are several RV builder sites where they show how they used this latch for the oil door.
I remember Don Checkoway is one of them.
Links:
http://www.wicksaircraft.com/catalog/product_search_results.php/search=aGFydHdlbGw=
http://www.milspecproducts.com/
http://www.milspecproducts.com/26002700c-lock.htm
http://www.skybolt.com/
http://www.crracing.com/custom_built/hartwell_styles.shtml
http://www.milspecproducts.com/tool.htm#mst98
http://store.wagaero.com/product_info.php?products_id=2699
http://www.eberhard.com/ProductCateloge.aspx?CategoryID=12
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jeffrey_davidson(at)earth
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| Posted: Mon Dec 20, 2010 6:00 pm Post subject: Fwd: Hartwell latch |
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Thanks for the great information Carlos!
Jeff D
do not archive
From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of Carlos Sa
Sent: Monday, December 20, 2010 5:27 PM
To: zenith601-list(at)matronics.com
Subject: Fwd: Hartwell latch
Below is a summary of what I learned during the intalation of the Hartwell latches.
It's a note I sent to some builders that were interested in this set up.
Carlos
________________
To operate the latches, you will need to apply a force perpendicular to the skin, so the skin
and the area around it must be able to take the stress. My locker cover is 0.020" - I should have used 0.025", but I think it will survive. If not, it should be a matter of hours to make another one with thicker material.
New latches are a bit stiff, so I operated each one a number of times until they became easier
to work with - before I ever installed them in their "final resting place".
They open with a jolt, so they can damage the skin when they reach fully open position. The
damage is visible on the picture of the hole patters. One of them shows some deformation (3rd from left, on top). So, to fix the problem, I made a "cage", or travel stop, to make sure the latch stops before denting the skin. This is the purpose of those funny "match boxes" you see.
I learned *after* purchasing these latches that there is an model with travel limited to 90 degrees ...
Should you decide to use Hartwell latches, look for this particular model. See page 2 of the AS&S specs at http://www.aircraftspruce.com/catalog/appages/hartwell.pdf
I think this would be an H5000-3.
I used H5000-2-025-051, where 025 is the door thickness, and 051 is door plus frame thickness (the "limited travel" version would be H5000-3-025-051).
In my case they are both 0.020 and it fits well.
I got them from aviation-instrument.com , a gentleman named Chuck Gonzales -
mailto: cgonzalez(at)aviation-instrument.com (cgonzalez(at)aviation-instrument.com)
Great people to work with.
They were "surplus new", $10.00 each - that was a year ago, not sure if they have any left...
Hartwell wanted $100 each - they would manufacture them, as they have none in stock ...!!!
Wicks sells them at $10 each. I asked the complete part number (not shown on-line), and they are for thicker material - you might want to inquire and/or order a sample to see if it fits.
http://www.wicksaircraft.com/catalog/product_detail.php/pid=5075~subid=1456/index.html
There is also the "helicopter" variation, which would have been easier to install (round
holes), but the only source I found wanted $50/each.
http://www.crracing.com/custom_built/hartwell_styles.shtml
I think it deserves a little more searching, as it would save the time and effort of making irregular shaped holes.
If you decide against Hartwell latches, I would suggest camlock fasteners - more expensive than dzus, but, in my opinion, a better engineered solution: http://www.milspecproducts.com/
About the pictures:
I made hole patterns, starting with cardboard and then making them a bit better (on 0.016"),
until I was happy. I used the one to the right to trace the hole shape on the door, then
drilled small holes all around and shaped with a file.
The travel stop / cage was made of thin stock (0.020"?), and then a trapezoidal piece (0.032")
riveted inside (see sample next to the hole templates).
One more consideration (?): a Hartwell latch installation will be more permeable to air and water - there are more ways for the water to pass through, if compared to a dzu or camlock. But, for a "high performance" craft as the Zodie, I think this is no issue...
I posted a video on youtube, and when I went there to see it, I found one more on hartwell latches.
Here are the URLs:
http://www.youtube.com/watch?v=IGtyj-jPIb0
This is my video:
http://www.youtube.com/watch?v=evD30x62UwU
There are several RV builder sites where they show how they used this latch for the oil door.
I remember Don Checkoway is one of them.
Links:
http://www.wicksaircraft.com/catalog/product_search_results.php/search=aGFydHdlbGw=
http://www.milspecproducts.com/
http://www.milspecproducts.com/26002700c-lock.htm
http://www.skybolt.com/
http://www.crracing.com/custom_built/hartwell_styles.shtml
http://www.milspecproducts.com/tool.htm#mst98
http://store.wagaero.com/product_info.php?products_id=2699
http://www.eberhard.com/ProductCateloge.aspx?CategoryID=12
[quote][b]
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http://www.matronics.com/Navigator?Zenith601-List |
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