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Date: Sun, 13 Aug 2006 14:03:09 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Emailing: DoorOpenLside.jpg
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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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> > 
>