[simpits-tech] motion systems for sims

[Ben Jones]

Sorry guys for not replying earlier  i have been travelling around for work , at home at last !

I have not even looked at high compressed air and pnumatic rams to controll a pit , i know they have  down falls , that can only be overcome buy the use of lots of time , money and sweat  the three things i have none of at the moment.

The other thing that turned me off pnumatics , is that i work on some of these systems for work when a part in the process breaks it usally is verry expensive to fix ..

Link trainers are a wooden simulator built in war time to teach nav training  to british and australian pilots , the use 4 accordian type of baffells to controll pitch and roll  , the greatness of this system is that you only need a constant supply of air about 15 CFM out of a compressor( really just a big blower )  , pipe  this air through a couple of regulators out to the baffels and violla the sim moves , 

the greatness of this system is that there is no hammering when the valves or cylinder are actuated , because as the baffell inflates it expands at a smooth rate .

the controll stick in the cockpit have to slide regulators attached to it one for pitch and one for roll  as you push the stick left to roll left the right hand baffel is expanded and the left habd baffel is exhaused at a slightly lesser rate of inflation to provide some resistance to the inflating baffell vice - versa if stick is moved forward back or right .

in the links yaw is controlled by a motor and pulleys to spin the cockpit around  

my next question does any one out there know if  any sort  of manuals or books are avaliable on the link trainers , i have two trainers to look  at but ....getting the time and getting access to the room where they are stored on the base is a nother  thing 

i might bee able to gather some pics and sketches of the link if any one is interested , but that is a lonk term project.


regards 

BEN  JONES




-----Original Message-----
From: Andreas Fransson [mailto:andreas.fransson@post.utfors.se]
Sent: Saturday, 6 April 2002 12:20 AM
To: simpits-tech@simpits.org
Subject: Re: [simpits-tech] motion systems for sims


Stig,

If you need large but short bursts of air, the way to do it is by mounting
an accumulator next to the cylinder. Put the valve between the acc and the
cylinder, and connect the acc to the compressor. Better make that a
large-bore valve too.

/Andreas

From: "Stig Joergensen" <stig.joergensen@clearsky.dk>
> Well you can get rid of the "bounce" feeling, by makeing a locking
> mechanism on the actuator piston, the big problem as i see it, the air
> preasure need for speed is going to be huge, i doubt that a normal 2hk
> 300liters/min (8 bar) will do the job, even if you have one of these per
> actuator. Well maybe in a standard turn it will be enough, but to get
> the "bumpy" and the "sink" feeling on takeoff will require a lot more of
> "air speed"
>
> /Stig