Posted by: mrmannerz on Mar-23-13 12:53 PM (EST)
for airbags, it just won't matter much. Design-wise, put them somewhere off of the ribs...just so they are more out of the way when the bag is not in use. Position them where they hold the airbag securely. Structurally, the boat is good for sliding over a beaver dam, a round submerged rock, log, etc. Without wasting time doing any math, the load from the airbag attachment will be less than those normal mishaps. My previous comments were more about misleading "engineering" knowledge, so to speak.
If you want extra credit, do the math, figure the airbag volume, figure the weight of the water it displaces (thats the upward load on the hull). Assume each tie down takes a fair share (not correct, but close enough) of that....it's gonna come out less than loaded canoe sliding over an unseen rock.
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