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

[Rob Hommel]

Ian

It is great to see someone interested in building telescopes, I thought
perhaps I was one of the few nut cases in the world that would still do
something like that. While I dislike the Dobsonian method The practical
world information one can learn from building a telescope is incredible.

As you have already learned this is an engineering problem not to be taken
lightly.

Best of luck to you in building a telescope, things are looking up.<snicker>

Keep 'em Flying
Rob Hommel
----- Original Message -----
From: "Ian Grant" <grant_ian@yahoo.com>
To: <simpits-tech@simpits.org>
Sent: Wednesday, December 04, 2002 8:22 PM
Subject: RE: [simpits-tech] Re: motion platform, and outside view.


> 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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