Slide choke

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Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

A while ago I successfully built a slide choke using a 500 Ft spool 
of #10 thhn house wire, and coated mild steel tig rods, cut to 12". I 
have aquired some "I" laminations that are 1 3/4 inches wide, and 18" 
long. I have enough to make 2 , 1 3/4 square cores. I have about 750 
ft. of #8 PVC wire. Is the length/width ratio of the coil a major 
factor? In other words, can I wind an 18" long coil with the wire I 
have, and just use the laminations as is? I'll be using this with 
240v, up to 50 A Initially, and maybe 90A later.