[simpits-tech] Re: motion platform, and outside view.

[Ian Grant]

I just read a book about material strength - "Building Large Dobsonian
Telescopes" (I think...). Unfortunately I took it back to the library!
I'll see if it's there, and copy the formula. The author provided a very
straightforward way of figuring it all out. It went something like this:

Double the size, cube the weight, but the stiffness depended upon the
wall of the tube. Double the wall (e.g. 2mm instead of 1mm), and you
quadruple (I think) the stiffness. They also said aluminium/aluminum was
as good as steel in most applications. (If memory serves, I saw the same
thing in a book on chassis design). It was also considerably lighter. I
understand that it is difficult to weld, however (I don't know how to
weld). 

The triangulation is similar to building trusses and some skyscraper
beams. I was once involved in a project that dealt with the construction
of a (very) large skyscraper, and one of the engineers told me that you
need less material than you would think, but it has to be laid out
properly. McGraw-Hill probably publishes something on this. 

Good luck!
/Ian

PS From experience of perching monitors in precarious positions, I can
tell you that the point of balance shifts the moment you look away from
that particular monitor... (I can still see the monitor pitching slowly
forward!)

-----Original Message-----
From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org] On Behalf Of Rod Dale
Sent: Thursday, November 28, 2002 12:16 PM
To: simpits-tech@simpits.org
Subject: Re: [simpits-tech] Re: motion platform, and outside view.

I'd use 50mm (2 inch) myself but depends on the overall dimensions and
estimated weight of the simulator.
Yes the triangular sections in each corner would help greatly with
strengthening.
Use Wideview - it's made for many monitor outside views - found at
http://www.wideview.it/
Rod
----- Original Message -----
From: Jonas Frazier <spitpilot40@hotmail.com>
To: <simpits-tech@simpits.org>
Sent: Wednesday, November 27, 2002 12:09 PM
Subject: [simpits-tech] Re: motion platform, and outside view.


> HI all:
> What size of square steel tubing,  some 1"x1". I know that in bridge
> building they build the sections in triangles. Should I put a triangle
in
> the corners? Also,  what's a good way to rig 6 moniters for the out
side
> views? Thanks.
>
> Jonas
>
>
>
>
>
>
> >From: "Rod Dale" <rodd@castle.net.au>
> >Reply-To: simpits-tech@simpits.org
> >To: <simpits-tech@simpits.org>
> >Subject: Re: [simpits-tech] (no subject)
> >Date: Wed, 27 Nov 2002 09:34:18 -0800
> >
> >Jonas,
> >Don't even think of using anything ROUND as in piping - it bends far
too
> >easy. Forget timber too. For a motion platform I'd use nothing less
than
> >heavy square steel tubing or similar welded together - with
crossbracing.
> >The motion platform will have to move in at least two or three planes
so
it
> >HAS to be extremely strong and rigid. Also your simulator is going to
end
> >up
> >being very heavy esp. when you have two or three people sitting in
it. My
> >F-111 sim is very heavy by itself - I need a hydraulic car jack and
stands
> >to raise it enough to work underneath.
> >If you intend to use motion, you must also ensure that your simulator
> >frame\structure is sound. Again I wouldn't use timber. My F-111 has
timber
> >framing\ribs etc that are glued, bolted and screwed together firmly
but
it
> >can still go out of shape even when I just wheel it around to
reposition
it
> >! I found this out when I went to refit my canopies. The alignment
was
out
> >on each by a good inch !!!
> >Rod
> >
> >----- Original Message -----
> >From: Jonas Frazier <spitpilot40@hotmail.com>
> >To: <simpits-tech@simpits.org>
> >Sent: Tuesday, November 26, 2002 11:47 AM
> >Subject: [simpits-tech] (no subject)
> >
> >
> > >
> > > Hi:
> > > I had to ask a question. I'm in the planning stages for the motion
> >platform.
> > > I was wondering if any body has any suggestions for what size and
type
> >of
> > > meterial should be used. Example: 1 inch piping. I need all the
> >suggestions.
> > > Also,  could the A/C panel for an airliner sim be connected to
small
> >space
> > > heaters,  and an airconditioner (the ones with the fan) both have
> >variable
> > > heat,  and cold tempratures. Thanks
> > > SEB
> > > PLease check my web site for my blue prints with dimentions for
the
> > > bulkheads on the 747-400 so far. Thanks
> > > www.geocities.com/dc10747/
> > >
> > >
> > > _________________________________________________________________
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