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

[Marv De Beque]

             IF YOU REALLY WANT TO DO IT RIGT---

Build a full size aircraft with all the control surfaces and put a giant
speed controlled fan in front of it.  ;-)



On 2/10/03 12:08 AM, "Matt Bailey" <mattb@rtccom.net> wrote:

> 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
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