Has anybody heard of a unit called snail?
Sorry Ninjatron, but Ogata was correct. Here is the flaw in your math.
[lb-sec^2/ft][ft/(12*in)] = lb-sec^2/in (NO!)
This should read
[lb-sec^2/ft][ft/(12*in)] = (1/12) (lb-sec^2/ft) (ft/in) = (1/12) [lb-sec^2/in]
Thus, 1 slug = 1/12 snail, or 1 snail = 12 slugs as Ogata said.
1 lbf accelerates 1 snail at 1 in/s^2
1 lbf = (1 snail) (1 in/s^2) => snail has units lbf s^2/in
1 lbf accelerates 1 sliug at 1 ft/s^2
1 lbf = (1 slug) (1 ft/s^2) => slug has units lbf s^2/ft
So 1 lbf imparts a larger acceleration on 1 slug than on 1 snail. Thus, slugs are smaller than snails, NOIT the other way around.
Hope this helps. EMA