I would think that the "softness" of an air system would limit its
usefulness. I had heard that there were problems with fluid compressibility
and component expansion on prototype high-pressure hydraulics (over 5000
psi) and air is much worse than that.


"Clark" stillnospam@me wrote in message
...
"The Enlightenment" wrote in news:gF1wb.23785
:

[snip]

I predict incidentally that compressed air servo systems will replace
hydraulics in many aircraft. Safety, economy and ease of service will
promote that.


Ever had one of those air control lines freeze? I have and its not fun...