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Pneumatic actuators for 2DOF and more

rigs with pneumatic actuators:

by @hugso

https://www.xsimulator.net/community/threads/5-dof-flight-sim.10016/

by @Sijmen

a nice one!

https://www.instructables.com/Arduino-Pneumatic-Flight-Simulator/

Downsides:
not really suitable for home use: is noisy (air exhaust, compressor), air exhausted is oily
require maintenance
difficult to control as affordable valves are on/off only

you can use linear position sensor and proportional servo valve then it's possible to set position and vary speed. But it's costly.

interrupted project by @berty
https://www.xsimulator.net/community/threads/2dof-pneumatic-simlator.6170/

PS : many gSeat have been designed with bladder compression. It's a kind of "soft" pneumatic actuator.
Circuit is closed so no exhaust noise, no compressor.

https://www.xsimulator.net/community/faq/gseat.20/category