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pbuttles(at)charter.net
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 Posted: Sat Sep 26, 2009 5:45 pm Post subject: opening door in flight |
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has anyone moded the new style buble doors to open in flight?
i need to do that for a guy and thinking of strenghting the hinge area and installing 2 gas struts to do it
any other thoughts?
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john.marzulli(at)gmail.co
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| Posted: Sat Sep 26, 2009 6:40 pm Post subject: opening door in flight |
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It seems like opening the bubble doors in flight would be a terrible idea. They have a large surface area combined with a cup shape.
This would in the least create a large pitch variation and adverse yaw if not opened on both sides.
The forces exerted against the frame and hinge would be large given the long length. If the hinge did not give out, then at least a large stress will be placed on the subframe there.
If the door did come off then the risk to catastrophic damage to the tail seems great.
Wasn't there an indicdent mentioned on the list where the door popped open in flight causing it to tear off and hit the tail?
John Marzulli
http://www.GenevieveMarzulli.org/
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Sat, Sep 26, 2009 at 6:42 PM, Tracy <pbuttles(at)charter.net (pbuttles(at)charter.net)> wrote:
[quote]--> Zenith701801-List message posted by: Tracy <pbuttles(at)charter.net (pbuttles(at)charter.net)>
has anyone moded the new style buble doors to open in flight?
i need to do that for a guy and thinking of strenghting the hinge area and ins======
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vgstol(at)bigpond.net.au
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| Posted: Sat Sep 26, 2009 7:43 pm Post subject: opening door in flight |
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Have a look at http://www.stolspeed.com/701-door-warning
A second incident has since happened with a Savannah. This time the door didn't rip off, but got badly mangled. An open door like that can ride nice and stable until the 80kt airflow catches it wrong, and then all hell breaks loose! Take care.....
JG
On Sun, Sep 27, 2009 at 12:36 PM, John Marzulli <john.marzulli(at)gmail.com (john.marzulli(at)gmail.com)> wrote:
[quote] It seems like opening the bubble doors in flight would be a terrible idea. They have a large surface area combined with a cup shape.
This would in the least create a large pitch variation and adverse yaw if not opened on both sides.
The forces exerted against the frame and hinge would be large given the long length. If the hinge did not give out, then at least a large stress will be placed on the subframe there.
If the door did come off then the risk to catastrophic damage to the tail seems great.
Wasn't there an indicdent mentioned on the list where the door popped open in flight causing it to tear off and hit the tail?
John Marzulli
http://www.GenevieveMarzulli.org/
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Sat, Sep 26, 2009 at 6:42 PM, Tracy <pbuttles(at)charter.net (pbuttles(at)charter.net)> wrote:
[b]
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Mike Hoffman
Joined: 11 Mar 2006
Posts: 54
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| Posted: Sun Sep 27, 2009 4:23 am Post subject: Re: opening door in flight |
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It would be nice if someone could figure and share how to put a wind up type spring on the inside if the door handle. One that would require a firm twist to open the handle.
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Geoff Heap
Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey
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| Posted: Sun Jul 12, 2020 5:16 am Post subject: Re: opening door in flight |
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My door opened on my first flight. It was impossible to pull it back and close
it. You would need superhuman strength. You can' overpower the wind. Unlike the the pilot that John mentioned my door did not slam into the bottom of the wing with the door handle piercing the bottom wing skin before ripping off and hitting the horizontal tail, never to be found, my door went up high, did not damage the wing, could not be reached so I slowed airspeed and it lowered to about 45Degrees. It flew stable, like a third wing. I considered my options and decided to ignore it which I am sure was correct.I landed safely and changed the angle of the bracket that holds the door handle latch. It has not happened again. The bracket was in a neutral position and the latch vibrated loose on downwind. I changed the angle slightly to cause the latch to want to stay closed. This is not the "Bubble" door.
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Dual controls. Dynon 180. Icom 210 Garmin 296. Becker transponder. Sigtronics intercom. Electric flaperons. |
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stephencliverichards(at)g
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| Posted: Sun Jul 12, 2020 7:48 am Post subject: opening door in flight |
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With the bubble door we added 2 additional latches driven by rods from the original latch simular to the 801. After door is latched we have added a simple latch at the front of the door to pull door in out of air flow.
The door can still be opened from the outside in an emergency by the original handle as the door will flex enough to release the new front latch.
We also used bolts not rivets in hinge on door.
On Sun, 12 Jul 2020, 14:18 Geoff Heap, <stol10(at)comcast.net (stol10(at)comcast.net)> wrote:
| Quote: | --> Zenith701801-List message posted by: "Geoff Heap" <stol10(at)comcast.net (stol10(at)comcast.net)>
My door opened on my first flight. It was impossible to pull it back and close
it. You would need superhuman strength. You can' overpower the wind. Unlike the the pilot that John mentioned my door did not slam into the bottom of the wing with the door handle piercing the bottom wing skin before ripping off and hitting the horizontal tail, never to be found, my door went up high, did not damage the wing, could not be reached so I slowed airspeed and it lowered to about 45Degrees. It flew stable, like a third wing. I considered my options and decided to ignore it which I am sure was correct.I landed safely and changed the angle of the bracket that holds the door handle latch. It has not happened again. The bracket was in a neutral position and the latch vibrated loose on downwind. I changed the angle slightly to cause the latch to want to stay closed. This is not the "Bubble" door.
--------
Dual controls. Dynon 180. Icom 210 Garmin 296. Becker transponder. Sigtronics intercom. Electric flaperons.
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DamienGH
Joined: 11 Jun 2020
Posts: 2
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| Posted: Wed Aug 12, 2020 7:32 am Post subject: Re: opening door in flight |
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| stephencliverichards(at)g wrote: | With the bubble door we added 2 additional latches driven by rods from the original latch simular to the 801. After door is latched we have added a simple latch at the front of the door to pull door in out of air flow.
The door can still be opened from the outside in an emergency by the original handle as the door will flex enough to release the new front latch.
We also used bolts not rivets in hinge on door.
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Thanks for the clarifications. I will try to take this as a basis for the review. My son is in a technical class and they often use real situations for general discussion. I usually send working material here - http://www.writemyessayquick.net/ Professional writers complement the technical data with a beautiful design and the school project is ready))
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