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saolesen(at)sirentel.net
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 Posted: Sat Feb 12, 2011 8:52 am Post subject: Lost doors & door warning-throttle system |
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I've been reading the lost door posts and I am dismayed that there is still no definitive solution. I have Van's door fix and have not installed it. After I read the post from the guy who blew the door open during run up with Vans door catch installed it seemed useless.
The key to safe doors is to be sure the pins are in the door frame holes and long enough. I never liked Vans magnetic switches for sensing where the pins are so I use micro switches. The micro switches are held in place using a bracket attached to the screws above and below the pin hole in the frame. It is designed so that each microswitch has to be touched for the light to turn off-- that is each microswitch is capable of turning the light on by itself. Any door misalignments with one pin in and one pin out will still trigger the lights and horn. I recently added a throttle position switch to turn on a horn if the throttle is wide open and the door pins are not correctly aligned. The throttle bracket is mounted to a bolt on top of the air cleaner box. The horn can be defeated with a switch and the horn resets itself if the throttle is retarded so the system rearms itself. My big problem is that my Bose headsets are very good at canceling the horn noise. If any of you know how to make a device that can make an obnoxious tone and send to it to the audio panel I would like to hear about it. I borrowed heavily from my Long-EZ's canopy-gear-throttle warning system for the design. It uses the relays and lights that came with the kit and about $40 of Radio Shack parts. I feel if the pins are in the correct position and deep enough through the frame the doors are safe and this system tells you if both conditions are met and gives a final warning before takeoff if they are not met.
Sheldon Olesen
N475PV 239 hrs
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Door-Throttle_Warning_System_2.pdf |
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sat Feb 12, 2011 10:15 am Post subject: Lost doors & door warning-throttle system |
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What do you mean no definitive solution? Sean's latch mechanism is basically an ideal fix and is available as a retrofit... You can't do much better than that for those that want a better system.
On Feb 12, 2011, at 10:31 AM, Sheldon Olesen <saolesen(at)sirentel.net> wrote:
| Quote: |
I've been reading the lost door posts and I am dismayed that there is still no definitive solution. I have Van's door fix and have not installed it. After I read the post from the guy who blew the door open during run up with Vans door catch installed it seemed useless.
The key to safe doors is to be sure the pins are in the door frame holes and long enough. I never liked Vans magnetic switches for sensing where the pins are so I use micro switches. The micro switches are held in place using a bracket attached to the screws above and below the pin hole in the frame. It is designed so that each microswitch has to be touched for the light to turn off-- that is each microswitch is capable of turning the light on by itself. Any door misalignments with one pin in and one pin out will still trigger the lights and horn. I recently added a throttle position switch to turn on a horn if the throttle is wide open and the door pins are not correctly aligned. The throttle bracket is mounted to a bolt on top of the air cleaner box. The horn can be defeated with a switch and the horn resets itself if the throttle is retarded so the system rearms itself. My big problem is that my Bose headsets are very good at canceling the horn noise. If any of you know how to make a device that can make an obnoxious tone and send to it to the audio panel I would like to hear about it. I borrowed heavily from my Long-EZ's canopy-gear-throttle warning system for the design. It uses the relays and lights that came with the kit and about $40 of Radio Shack parts. I feel if the pins are in the correct position and deep enough through the frame the doors are safe and this system tells you if both conditions are met and gives a final warning before takeoff if they are not met.
Sheldon Olesen
N475PV 239 hrs
<Door-Throttle Warning System 2.pdf>
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sat Feb 12, 2011 12:20 pm Post subject: Re: Lost doors & door warning-throttle system |
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It seems to me that an important part of Sean's upgrade are the longer racks, which give a greater engagement depth.
This is such a simple mod that I do not understand why Van's hasn't changed the plans to cut the racks longer and get a longer throw.
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_________________
Bob Turner
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Ron B.
Joined: 17 Feb 2009
Posts: 103
Location: Nova Scotia
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| Posted: Sat Feb 12, 2011 3:16 pm Post subject: Re: Lost doors & door warning-throttle system |
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With the retro kit from Sean the racks are not longer. Providing care is taken to optimize the travel, penetration through the metal frame is not a problem. One has to understand the concept and obtain full travel. The center latch in Sean's kit is key to me. If the door is not pulled on properly, the center latch hits the door sill bracket and rotation of the door handle cannot continue. A little tug inward for the center latch to clear the top of the catch bracket. The cam now catches the bracket and then the rotation can continue and the pins will be lined up. So not only does the center cam latch help with pin line up it also is an indicator that the pins are not lined up.
Ron
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