[ John Tuttle wrote in 120113 MMDigest:

> Simple question: How much weight (in grams) should it take
> to collapse a striker pneumatic at least 90% of its travel?

John Tuttle asks a simple question; the answer is not so simple
because it depends on where the weight is placed.  Art Reblitz'
book says the pneumatic should collapse under its own weight,
but much comment I have heard is "they never do that."

I have a paper in the MMD Archives which analyses this problem.
Additionally, I have analysed the construction of many original
cloth samples and have developed a manufacturing specification
for a suitable cloth material.  All this information is intended
for publication and it will be done in the fullness of time.

Paul Rumpf
Melbourne , Australia

 [ Paul's technical paper, "Mechanical Forces Developed
 [ in Pianola Pneumatic Motors", can be downloaded at
 [ http://www.mmdigest.com/Gallery/Tech/rumpf_1.pdf 
 [ -- Robbie