On 08-27-97 Alec Cameron wrote to Day Brown... 
 AC>  DB> Could you make a piston big enough cheap enough to do anything  
 AC>  DB> useful with 15 PSI? 
 AC>  
 AC> I have never worked with these [air] engines but I once understood 
 AC> steam engine cycles and practical working examples. 
Thanx for the tips on low pressure steam Alec.  But whether steam 
or air, we still got the problem of making a piston with a big 
enough cross section to do anything useful... 
 
Spoze you could do a leather diaphram a foot across to get the big 
area you'd need? At 15 PSI, that's 1500 lb or so on maybe a short 
two inch stroke, 250 ft/lb per stroke.  howze leather react to steam? 
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