Ah, Tom Cooper, wotta fellow, I met him in Diamondhead once, he was 
on crutches, had a terrible trip and was in an awful mood.

However, he did a lot for our hobby years ago. The Merlin Hunslet I 
purchased in 1985 overall  was a strong, long  running loco with 
wonderful gas and regulator control.   The cupped "teflon" pistons 
lasted and lasted, the Merlin  Matterhorn lasted me well too. I sold 
both engines  a couple of years ago to  put a few dollars in my 
wallet towards the Duchess.  I suspect a book could be written about 
Tom!  "The Good,  The Bad and The Ugly!!" I remember the "Good" 
mostly!

Geoff

>So, Peter.....you're not a big fan of the Osmotor?.........8-)
>
>I remember Tom Cooper coming to a steamup in PA
>with his "Smokey Shay", and ticking off the host as
>he sprayed diesel fuel all over everything within 3
>feet in every direction. It ran out of steam every 10 feet
>and had to sit there while it built up pressure again.
>Not a very impressive demonstration.
>
>Ron
>
>
>
>
>On Jan 24, 2006, at 9:10 PM, Peter Foley wrote:
>
>>  Try another design.......Start out from scratch.......Anything but an
>>  Osmotor!  As produced by Tom Cooper they were a total pig's ear, 
>>  requiring
>>  upward of 100 hours of running to bed properly.  My buddy Bill 
>>  Shipp has a
>>  Steamlines shay that is powered by an Osmotor, and after 100+ hours 
>>  it is
>>  only now approaching a condition that could be described as 
>>  'controllable'.
>>
>>  The problems are inherent in the design - the spring pressure to 
>>  hold the
>>  cylinder against the port comes from the outside edges of the 
>>  cylinder, not
>>  at the centre of rotation.  This compounds friction forces 
>>  tremendously -
>>  not only the cylinder/port face friction found on every oscillator, 
>>  but two
>>  additional moving points of friction on each cylinder as the spring 
>>  holders
>>  move back and forth in an arc as the cylinder goes through a cycle.
>>
>>  All in all, a design best lost.
>>
>>  regards,
>>
>>  pf
>>
>>
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