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I am convinced (but have not done a comparative analysis) that this arrangement does produce less outward force on the top of the door frame/hanger than a bi-fold. The hydraulic ram ends up at a 47 deg angle to the ground and so supports approx 70.7 % of the door weight. If the door weighed 600 lbs finished then I estimate the door frame would support approx 200 lbs and the ram 400 lbs. Since the "balance" point of the door is along the axis of the beam this should mean very small outward forces once the beam is raised.
I preferred hydraulics and this single solid structure door as I've seen folks encounter problems with bi-fold - particularly with the cables. Also this is the only design that would permit me to follow the contour of the Q hut and gain the entire width of the building for an opening.
Here is the view of the open door frame front on.
Ed
----- Original Message ----- From: "Bob White" <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, August 13, 2006 4:03 PM
Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg
Thanks Ed,
I had the same impression that Bob P. had that you were building a
bi-fold door. I was really looking hard for the cylinder on the near
side, and couldn't see it. After seeing the second photo and staring
at the first one a while, I think there is just a small section of it
showing and not quite where I expected it. It seems like the ram is
helping to support the door in a way that reduces the outward pull on
the top of the hanger.
I'm renting space in a homebuilt hanger. The homebuilt doors are
folding doors that don't quite open as easily as one would like. I may
see if I can talk him into building a new door similar to yours.
Bob W.
On Sun, 13 Aug 2006 14:13:11 -0400
"Ed Anderson" <eanderson@carolina.rr.com> wrote:
Hi Bob,
Thanks. No, the bar is actually the 12 foot long hydraulic ram extended to
its full open position (6 feet retracted). I have a 3x2 metal tube acting
as the frame tied into the front sheet metal. The front sheet metal acts as
the web of a large "I" beam making it very stiff. To counter the tendency
of the door to pull the top away from the hangar, I have 3 lengths of angle
iron tied to the metal beam and then back 4 rows into the arch structure.
However, I found that the very ends of the metal beam (where it attaches to
the supporting posts) tends to torque a small amount when the door is fully
open. So I will need to stiffen that area on each end of the beam - but, no
major work required.
The hydraulic pressure measures 450 psi when the door is fully extended.
The system can put out 2500 psi and the rams (one on each end of the door)
are capable of pushing with a combined force of 8,800 lbs with that
pressure - so I do have a bit of margin {:>)
Here is a photo from the other side where you can see the other cylinder as
well as the hydraulic power pack on the floor under it.
Ed
----- Original Message ----- From: "Bob White" <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, August 13, 2006 1:46 PM
Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg
> Hi Ed,
>
> Looks great.
>
> Is the bar on the far side a permanent part of the support? Did you
> have to put any bracing behind the top front of the hanger to handle
> the weight hanging out when the door is open?
>
> Bob W.
>
>
>
> On Sun, 13 Aug 2006 13:03:10 -0400
> "Ed Anderson" <eanderson@carolina.rr.com> wrote:
>
>> Ok, folks.
>>
>> Here it is, the hangar door completely open. Minor sag at the >> junction
>> of 2x4 on front-most edge and some torquing of metal beam at the ends
>> where it meets the supporting post. Will stiffen with some plate and
>> angle iron.
>> Given no sheathing (yet) to stiffen the structure, I am very pleased >> with
>> the results.
>>
>> If anyone wants more photos, send me an e mail
>>
>> Ed
>>
>>
>> The message is ready to be sent with the following file or link
>> attachments:
>> DoorOpenLside.jpg
>>
>> Note: To protect against computer viruses, e-mail programs may prevent
>> sending or receiving certain types of file attachments. Check your
>> e-mail security settings to determine how attachments are handled.
>
--------------------------------------------------------------------------------
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