[simpits-tech] Simulating g

[Chris Woodul]

For the record, in the real world of Military Simulation, Pnuematics are
passe'.....but in a homebuilt setting, that might be a safe and easy route
to go. The old sim you are refering to is just that "old".

Chris

----- Original Message -----
From: "Marv De Beque" <mdebeque@woh.rr.com>
To: <simpits-tech@simpits.org>
Sent: Tuesday, October 08, 2002 4:45 PM
Subject: Re: [simpits-tech] Simulating g


> The g seat for the simulator at Dayton uses pneumatics to inflate the back
> seat cushion.
>
> Why not keep the straps static (that is, do not tighten or loosen them)
and
> inflate and deflate the seat cushion to provide a squeezing effect.  This
> way you can set the straps before flight to a desired tension.
>
> This would be much safer for the pilot and easier to control electrically
> and electronically.
>
> I would be worried of the possibility of strangulation if you attach
straps
> to a motor.
>
> You can regulate the maximum air pressure with a regulator and a pop-off
> valve.  10 to 15 psi max would be all you need.  You might be able to make
a
> bellows that could be mechanically operated by a motor or hunt around for
a
> electrically operated air pressure regulator (best choice) that you can
> control by voltage.
>
> If you have an eject handle I would strongly urge you to rig it so it
> overrides the air pressure (a manual safety valve).
>
> Instruct the student that if he is uncomfortable with the seat or anything
> in the sim, yank the handle and it will stop the simulation.
>
> That would be a good safety mechanism for your liability.
>
> Any failure in the system would worst case cause a loud hissing (probably
> muted by the cushion) and the seat back would deflate.
>
> You can make a seat cushion from a toy raft used for pools.  You can
resize
> it by heat sealing it and cutting excess off.  You can make your own hot
> wire heat sealer with some scrap parts and some wire hooked to a 12 volt
> battery.  You just need to size the wire and control the current through
it
> to get the right temperature.
>
> Marv
> --
>
>
> > From: Justin Messenger <jjmessenger@yahoo.com>
> > Reply-To: simpits-tech@simpits.org
> > Date: Tue, 8 Oct 2002 11:51:38 -0700 (PDT)
> > To: Simpits-tech@simpits.org
> > Subject: [simpits-tech] Simulating g
> >
> > Here's the deal, I am going to have cadets use my sim
> > and know using a g suit is not practical so I want to
> > simply cause the shoulder harness to tighten when the
> > stick is pulled aft. I need tips to use a motor to
> > gradually increase the pull as the stick is pulled
> > back past the center position, How do I get a 12V DC
> > motor to slowly increase tension? For now it will
> > simply be a mechanical interface from the stick to the
> > motor. I have a rod running from my stick under the
> > seat to the rear of the pit, so I can hook the motor
> > to the rod for joystick input, Is there some kind of
> > pot I can use to control the motor? What should it be
> > rated?  Also, where would be a good motor for this
> > use?
> >
> > Justin
> >
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