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Full motion home flight simulator.
While I was researching pneumatic positioning systems I came across
this web site which may be of interest to rec.aviation.military. It looks like a German Kid who's putting together a full motion flight simulator as a cooperative 'open source project' that is affordable for a home user. http://www.cadsoft.de/people/kls/fltsim/index.htm This is some background on the technology : 6.5 bar (100psi) air has a great tradition for use in Industry because of its cheapness, clean nature and power. Several years ago the FESTO company brought out pneumatic positioning systems using a 5/3 way analog servo valve. With modern control electronics pneumatic servo systems can now position with full force against a disturbance to within an amazing 0.02mm. The analog servo valves cost about US$500 however by using normal 5/3 way solenoid valves and pulsing them (PWM pulse width modulation) almost the same accuracy (0.2mm) can be achieved for US$50.00 I predict incidentally that compressed air servo systems will replace hydraulics in many aircraft. Safety, economy and ease of service will promote that. |
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The Enlightenment wrote: While I was researching pneumatic positioning systems I came across this web site which may be of interest to rec.aviation.military. It looks like a German Kid who's putting together a full motion flight simulator as a cooperative 'open source project' that is affordable for a home user. http://www.cadsoft.de/people/kls/fltsim/index.htm This is some background on the technology : 6.5 bar (100psi) air has a great tradition for use in Industry because of its cheapness, clean nature and power. Several years ago the FESTO company brought out pneumatic positioning systems using a 5/3 way analog servo valve. With modern control electronics pneumatic servo systems can now position with full force against a disturbance to within an amazing 0.02mm. The analog servo valves cost about US$500 however by using normal 5/3 way solenoid valves and pulsing them (PWM pulse width modulation) almost the same accuracy (0.2mm) can be achieved for US$50.00 I predict incidentally that compressed air servo systems will replace hydraulics in many aircraft. Safety, economy and ease of service will promote that. 100psi pneumatics do not compare favourably with 1500psi (some sims I've dealt with) or 3000psi (aircraft) hydraulics in performance terms. He's just not going to get the dynamics he needs because of the low supply pressure and the compressibility of his chosen working fluid. However he's still got to invest in pumps, precision-valves and plumbing and the maintenance thereof. He'd be better off looking at electric drives, of the kind that are already busy replacing hydraulics in affordable sims. Oh and he's going to have "hours of fun" trying to integrate a cheap head-tracked display system also. Top marks for enthusiasm and effort though. |
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"NoHoverStop" wrote in message ... The Enlightenment wrote: While I was researching pneumatic positioning systems I came across this web site which may be of interest to rec.aviation.military. It looks like a German Kid who's putting together a full motion flight simulator as a cooperative 'open source project' that is affordable for a home user. http://www.cadsoft.de/people/kls/fltsim/index.htm This is some background on the technology : 6.5 bar (100psi) air has a great tradition for use in Industry because of its cheapness, clean nature and power. Several years ago the FESTO company brought out pneumatic positioning systems using a 5/3 way analog servo valve. With modern control electronics pneumatic servo systems can now position with full force against a disturbance to within an amazing 0.02mm. The analog servo valves cost about US$500 however by using normal 5/3 way solenoid valves and pulsing them (PWM pulse width modulation) almost the same accuracy (0.2mm) can be achieved for US$50.00 I predict incidentally that compressed air servo systems will replace hydraulics in many aircraft. Safety, economy and ease of service will promote that. 100psi pneumatics do not compare favourably with 1500psi (some sims I've dealt with) or 3000psi (aircraft) hydraulics in performance terms. He's just not going to get the dynamics he needs because of the low supply pressure and the compressibility of his chosen working fluid. Modern control theory and digital contollers mean that pneumatics can position accuately to within 0.02mm. Compressibility and cylinder stiction is not longer an problem: the control system compensates. These things are quite uncanny to experience. You can bash them with your thumb or even a hammer and they do not budge even for small cylinders. However he's still got to invest in pumps, precision-valves and plumbing and the maintenance thereof. Analog 5/3 servo valves are about US500 (though I've seen an Italian brand for about $300) as I pointed out however a solenoid coil on/off valve can do almost as good job by pulse modulating on and off and can be brough for $30.00/pair. (You would need 6) As far as the compressor goes; they can be brought for $100 at a local hardware (made in china). The nylon tiubing is negligable in price. He'd be better off looking at electric drives, of the kind that are already busy replacing hydraulics in affordable sims. I immagine 'affordable' refers to those texan oil millionaiers in that case. Electric positioning systems are not cheap either from my experience. Oh and he's going to have "hours of fun" trying to integrate a cheap head-tracked display system also. Top marks for enthusiasm and effort though. |
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