[simpits-tech] May the Force Feedback be with you...

[Matt Bailey]

Why bother with the extra trim cylinder? Just use one assembly, for force, 
and move it with, say, a rack and pinion. A reeaally neat way to do this 
would be to link a trim wheel to the rack and pinion, and connect a two-way 
motor/servo to the wheel........with the forward/off/aft switch mounted on 
the control stick/yoke. Then you have mechanical and electric trim available, 
bypassing software completely. Sweeet. :)

	-Matt Bailey

On Sunday 09 February 2003 23:44, you wrote:
> ive added labels to my drawing for bigger clarity..
>
> the problem of using one cylinder to handle both trim (center offset)
> and stick pressure is much the same as with a spring...
>
> say total is 20 units (that could be liters, PSI, bar pressure - what
> ever, it doesn't matter in this discustion..
> center is then C1A=10 and C1B=10
>
> if you are out of balance (wrong trim) and C1A=15 and C1B=5 it would be
> much easier to move the pistone 1inch and compress C1A than to compress
> C1B... but if you use Cylinder1 (=3 in my drawing, a little typo) to
> only control the pressure needed to move the stick things will get a lot
> simpler - more pressure in both C1A and C1B the harder it will be to
> move the stick.
>
> the reason for using to valves (V1 and V2) and not just putting C1A and
> C1B on the same hose is; the stick will just move air from one chamber
> to the other.
>
>
>
> with cylinder 2 you can control the center of the stick - hence the trim
> possition. if you put more pressure into C2A the stick will go backward,
> in effect you can contol where the netural stick possition is.....
>
>
> with regard to pressure needed to control the stick...
>
> you could probaly get a sping loaded system to work, but as Craig
> mentioned, there are afew conditions where it will get into trouble...
> namely :
>
> 1) no movement (here you could with my schematics just open V1 and V2
> and you would have no resistance what so ever)
>
> 2) high G turn where the force required to pull stick either backwards
> is greater then moving the stick forward (with my schematics this can be
> done by applying more pressure to C1B (and C2A to keep the netual
> possition)
>
> 3) very low G turn - the oposit of 2