[simpits-tech] Yoke/pedal force

[Craig Rochester]

Hi Steve,

I've worked with interfacing pneumatics to Falcon4.  A servo controlled needle valve works, but uses
a lot of compressed air and is noisy.

Another approach is to drive the diaphragm of a standard pressure regulator with a servo.  That is:
replace the threaded turning rod with a servo actuated rod.  It fairly easy and uses a fraction of
the air of a needle valve design.  Another advantage is that a regulator responds much faster to
changes.  When you move the cylinder and the volume changes, there's a "droop" in the pressure as
the pressure builds back up.  A regulator maintains a constant pressure much more accurately.

Here's the rig I made to pressurize a G-suit:
http://pages.zdnet.com/johncraigrochester/sitebuildercontent/sitebuilderpictures/new_gsuit_regulator
.jpg

Links:
http://forums.frugalsworld.com/vbb/showthread.php?s=&threadid=20800
http://www.simpits.org/forums/viewtopic.php?topic=55&forum=1&start=15

The white thing wouldn't be required to drive a cylinder.

I'm scheming on a way to use large motors as servos, driving against a spring.  I'd like to get away
from pneumatics.  Something like the actuators here:
http://www.inmotionsimulation.com/3DOF-videos.html

Dave and I want to build FF stick and rudder for a Spitfire.  The forces are in the 100's of pounds
ballpark.

Have fun,

Craig R.


-----Original Message-----
From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org]On Behalf Of Bubba
Sent: Tuesday, January 06, 2004 6:04 AM
To: Simpits
Subject: [simpits-tech] Yoke/pedal force


I just had another of my ideas. I'm planning on putting pneumatic cylinders
on the yoke and pedals to give more resistance, then using a needle valve
between the cylinders to adjust the resistance. How about controlling that
valve with a servo that's controlled by airspeed so the resistance increases
with speed?
--
Steve
mysticz28 at swbell.net
He who seeks will find, and he who knocks will be let in.


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