dan can we get?

Mellowman

I was reading in the tech topics and was wondering what is Gil's system syzer? Is it a tool and can you provide us with one? I would like to have more info on sizeing circulators closer to the right size and I think something like that chart might help.....I have read your newsletter on sizeing circs and I understand the rule 4 feet per 100 plus 50%. Can you explan how 4 feet was determined to be correct so I could understand how other restrictions might cause more head.... thanks for any help;)