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 Hi Hugh. The Firgelli's I bought are the "high speed" ones running 1.7 inch 
per second but only a 70 pound push and 6 inch stroke. 
The "slower" model is .4 inch per second at 150 pounds push. 
With a 2-1/2 or 4-1/2 inch stroke on the Lenco's and a 750 pound 
push.....the linkage can be reduced to speed up the rudder/dive plane motion and 
still have plenty of "push" power.  
I will use the Firgelli's inside the sub for seat adjustment and my sliding 
weight sled. Gotta save up and get three of those Lenco's. 
Frank D. 
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