[simpits-tech] ACES II Replica, G- cueing Seat.

[Craig Rochester]

Hi Chris,

Thank you for you feedback on the G-cueing, it's a real thrill to have a pro
give feedback on this.  Most of the time I feel like I'm working in a
vacuum.

Thanks for the link, I hadn't seen the Cranfield site.  I noticed they
mentioned loading.  Is this the shoulder strap loading, or maybe helmet
loading.  I'm interested in pursuing a 3 DOF(maybe 6) helmet loading system.
I've done a little preliminary experimenting:
http://pages.zdnet.com/johncraigrochester/vrvision/id12.html (photos at
bottom).  I'm already looking to do a HMD with head-tracking using a boom
attachment to my helmet, so adding actuators to the joints is a logical
extension(at least to me :)).  I've had promising results using an
electro-pneumatic regulator(V/P).  I rigged up a crude 6 DOF boom attached
to a helmet and mounted a long stroke pneumatic cylinder vertically to the
rotation gimbal.  I could move my head in all DOFs and still get a very
constant applied force.  I'm hoping the performance will be good enough to
apply simulated inertial and G-forces,  and also minimize the weight and
inertia of the boom.  I'm thinking I can calibrate the thing to "float".

End of rambling,

Thanks again,

Craig R.



-----Original Message-----
From:	simpits-tech-admin@simpits.org [mailto:simpits-tech-admin@simpits.org]
On Behalf Of Chris Woodul
Sent:	Tuesday, October 22, 2002 9:17 PM
To:	simpits-tech@simpits.org
Subject:	Re: [simpits-tech] ACES II Replica, G- cueing Seat.

Hi Craig,

I enjoyed reading the message thread you directed me to.
The Company I work at makes the SIMULATED SEAT it self and CRANFIELD
AEROSPACE in the UK makes the motor units, mechanisms and computers that run
the thing. We dont do the algorythms for them where I work. The Cranfield
seat is purely electric, except for the G-Valve assy for the Pilots G-suit.
I do know that on the older G-cueing seats that used Pneumatics that the
ability to evacuate the air that has been piped into the zone cushions was a
problem. I think you guys are quite smart and are definetly doing some cool
stuff.
I dont have any of the numbers on operations of the unit ( and If I did, I
am bound by a Non Disclosure Agreement with Cranfield Aerospace) If I can
find any thing like what you are looking for in other industry literature I
will most certainly forward it to you.
One neat thing about a G-cueing seat is that there is no need for WASHOUT,
like there is with a 6-DOF Motion Platform. People need to understand that
you cannot Simulate actual "G" with a G-cueing seat. You can however
demonstrate the displacements and pressures on your body that are nice CUEs
to what is happening.
The Cranfield people tell me that people who fly fighters "get it" but
non-pilots dont always understand the cues being imparted on them.
Other neat cues that are in the seat are accelerations, decelerations ( ie
Braking and Afterburner use) also Gunfire High Frequency Vibration, and
other areodynamic cues.
If you havent already been there in your own pursuits of making a G-Cueing
seat, here is the link to Cranfield.
http://www.cranfieldaerospace.com/spg/simulation.htm

Keep up the good work on your system, I am really impressed. As always there
are some really inovative and clever people on this fourm and thats why I
love being a simpits member!

Take care,
Chris Woodul

----- Original Message -----
From: "Craig Rochester" <johncraigroch@msn.com>
To: "Simpits-Tech@Simpits. Org" <simpits-tech@simpits.org>
Sent: Tuesday, October 22, 2002 3:40 PM
Subject: [simpits-tech] ACES II Replica, G- cueing Seat.


> Hi Chris,
>
> I've been reading through the archives and found your posts on the G-
Cueing
> seat.
> I've been working on a G-Suit pneumatic rig with some guys from Norway.
See
> this forum
> thread:http://www.simpits.org/forums/viewtopic.php?topicU&forum=1&start
> <http://www.simpits.org/forums/viewtopic.php?topic=55&forum=1&start=15>
(go
> to bottom).  I worked and worked to get a "regulator" that would exhaust
> quickly.  I finally stumbled on a rig that works well.  I use a "quick
> exhaust valve(QEV)" and a high capacity regulator.  The air exhaust is as
> fast as the supply.  Qualitative guestimates on performance:
> Range of supply pressure = 0-5 psig
> G-Force vs. G-Suit pressure- 1-9 G = 0-5 psig
> 9 G - 8 G(5-4.5 psig) decrease take about 0.1 sec
> 2 G - 1 G(0.5-0.0 psig) decrease take about 0.2 sec
> 9 G - 1 G(5-0.0 psig) decrease take about 0.75 sec
>
> The bottom line for me is the feel of the G-Suit.  I can feel 1/4 psi
> changes, and the changes feel intuitively correct when I fly Falcon4.  But
> I'm not a pilot and have never pulled Gs.;)
> Do you have specs for the G-Seat latency requirements?
> Regards,
>
> Craig
>
>
>
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