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Old Aug 28, 2015, 11:30 AM
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Skydive door for hangar 9 DHC-6 Twin Otter

The Hangar 9 model of the USAF Academy's Twin Otter has the normal Otter door instead of the roll-up lexan door that is used on this particular aircraft.

http://img1.jetphotos.net:8080/img/4...1338423270.jpg

Here is a good picture of such a door: http://2.bp.blogspot.com/-yHUcit_VLD...2014_1024A.jpg

Has anyone put a roll-up door on their Twin Otter? If so, can you give details?
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Last edited by kallend; Aug 28, 2015 at 11:36 AM.
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Old Aug 31, 2015, 11:57 AM
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Are you plan on sending divers out the door? You can't really put anything behind the CG, the main gear is too far forward to have anything behind it. Actually I have problem with the nose wheel not staying on the ground when I tried to push the CG back to make it flies better!

Brian, an EAJ
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Old Sep 01, 2015, 04:35 PM
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Seems like you could easily replicate that door with strips of plastic taped together with silver mylar tape.

http://www.uline.com/BL_6448/Metalized-Mylar-Tape

To open/close the door you can probably modify one of those mini screwdrivers... runs on 5-6Vdc, same as a servo:

http://www.homedepot.com/p/General-T...-500/202025658

So you build a track to run the doors in and a spindle to wind the door on... some kind of up/down/off switch for the screwdriver.

As Brian says you gotta worry about the CG, but you can pack your parachutists over the CG then feed them out one at a time progressively so as not to affect the balance too much, or dump them all out at once so quickly that the imbalance recovers before the tail gets heavy.

For a progressive feed you could make some sort of screw feed with a clock spring attached to vending-machine style helical coil.
http://www.wired.com/images_blogs/ga...05/MG_5621.jpg

Or you could shoot them out using a multi-shot rubberband-gun trigger:
http://www.instructables.com/id/Rubb...un-Multi-Shot/

Or simply have a sloped floor than dumps towards the door so they are gravity fed... and hope they don't get jammed. Careful packing and a smooth chute would probably prevent any problems.

However you do it, I look forward to seeing your solution.
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Old Sep 03, 2015, 02:45 AM
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Quote:
Originally Posted by bhchan View Post
Are you plan on sending divers out the door? You can't really put anything behind the CG, the main gear is too far forward to have anything behind it. Actually I have problem with the nose wheel not staying on the ground when I tried to push the CG back to make it flies better!

Brian, an EAJ
No, just wanted to make it look like the full-sized plane it's modeled after.
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Old Sep 03, 2015, 09:04 PM
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I wonder if one of the transparent roll-top type covers off of a pencil box would be big enough. But if you dont need it to open, clear plastic and alum or chrome striping tape would do it

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Old Sep 12, 2015, 06:47 PM
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I helped replace one on our DZ's Otter after it got sucked off in-flight.
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Old Sep 14, 2015, 02:53 PM
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I helped replace one on our DZ's Otter after it got sucked off in-flight.
Eloy?
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Old Sep 14, 2015, 04:24 PM
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Eloy is between Tucson and Phoenix AZ. I bet it was at Skydive Dallas.
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Old Sep 20, 2015, 12:59 PM
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Eloy?
Goldcoast, when it was still in Moss Point, was my home DZ
Only been in Texas 4 yrs, Mobile, AL and Lafayette LA before that.
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Old Sep 20, 2015, 09:59 PM
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Goldcoast, when it was still in Moss Point, was my home DZ
Only been in Texas 4 yrs, Mobile, AL and Lafayette LA before that.
Ha!

I was at Z-Hills when a Skyvan door came off in flight. Landed in the swamp.
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Old Sep 21, 2015, 11:38 AM
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Ahhh... I can't believe I didn't think of this before: LEGOs!

How To Make Lego Automatic Garage Shutter Doors With Electric Power Functions (1 min 29 sec)
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Old Sep 21, 2015, 02:03 PM
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Originally Posted by warhead_71 View Post
Ahhh... I can't believe I didn't think of this before: LEGOs!

https://www.youtube.com/watch?v=ayIW1jTvazk
I think you have a winner right there!
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