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That it would Dean. I'm not experienced with
hydraulics so I have no idea if its better to keep the pressure in the cylinder
and hose or support the door and release the pressure. Any hydraulic
experts know the effects? Its almost certain that if I
release the hydraulic pressure and let the doors rest on post/poles, then to
lower the door, I will have to bring the pressure back up. I would think
that this cycling of the pump might cause more wear than just leaving the
pressure up.
Anyone have any experience/knowledge in this
regard?
Ed
----- Original Message -----
Sent: Sunday, August 13, 2006 9:49
PM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Ed
You are probably way ahead of me on this, but if
your 9-10 foot pipes are strong enough to support the door well, it would
allow you to relieve the hydraulic pressure as long as the door is
up.
Dean Van Winkle
----- Original Message -----
Sent: Sunday, August 13, 2006 7:25
PM
Subject: [FlyRotary] Re: Emailing:
DoorOpenLside.jpg
Ed,
A question out of curiosity, Do you
have the hydraulics set up so that the door is power up, and power down, or
is it just gravity down? Reason I ask is in the event of a hose or pipe
break, that the door does not come crashing down. That it would stay in
place, or at least a restrictor so as to let the door down very
gently. Because, if your luck is anything like mine, the airplane
would likely be passing under it at the time. Not to mention the safety
issue. Just curious. Personally, I think the hydraulic single panel
door is the only way to go, provided it is done safely. Just my
opinion.
Ed Anderson <eanderson@carolina.rr.com>
wrote:
Hi
David,
You are right on all counts, fortunately- it is not a timber
beam. Its
actually a engineered box beam very similar to wooden spars
built for
aircraft. But, without quite as much attention to weight
savings {:>). I
used Liquid Nails Subfloor adhesive after
discussing my project/needs with
their technical staff (learned a bit
about wood glues/adhesives) and deck
screws to build the beam. It
weighs around 180 lbs.
Its basically a warren truss enclosed in
plywood. It just took less work
(more lumber, but less work), to have
the building material store cut me 16"
wide strips of plywood (4 to a
sheet) and then use those as the webs rather
than cutting out the
gussets necessary for each brace/flange interface to
build an wooden
open warren or Pratt truss. It would be interesting to see
how light
the beam could be made, but I've been working on building hangars
and
doors since around March and wanted to see the light at the end of the
tunnel {:>). Besides, I can't fly until the door is finished as my
aircraft
is trapped inside!!!
Appreciate your
comments
Ed
----- Original Message -----
From: "david
mccandless"
To: "Rotary motors in aircraft"
Sent: Sunday, August 13, 2006 6:23
PM
Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg
>
Hi Ed,
> I do not need a door nor a hangar, but as the discussion
progresses I am
> becoming more interested.
> I would have
thought that a Warren type truss, fabricated from, say, 3
> inch
channel for chords and 2 inch angle for webs, would have been a
>
better and lighter solution than a timber beam.
> Is that big center
beam a laminated truss or a plywood fabricated beam?
> I am an old
structural engineer from 40 years ago, I have a lifelong love
> of
bridges, and have never loss my interest in beams etc, so this is not
> meant to be criticism but rather to satisfy my own
curiosity.
> BR, Dave McC
>
> On 14, Aug , at 5:51 AM,
Ed Anderson wrote:
>
>> 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.
>
>
> --
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http://www.flyrotary.com/
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