Originally Posted by Greggegner
You may never have any issue but some of the statements are not correct. The force on the boom is the same no matter where the mainsheet is. Deciding how to distribute the load and how the point load (like during an accidental jibe) is your problem. Momentum counts, when the boom comes over fast and the main sheet at the end on the boom come up tight the middle of the boom wants to continue moving. This put a tremendous stress of the boom. The amount of stress is proportional to the distance from the center of the boom to the closest attachment point. I would suggest adding a permanent preventer (the friction type) and call it a day.
Yes the mass of the boom itself wants to keep going, but this is minor compared to the sail pulling on the boom. Most of the sail's load is at the end of the boom, with loose footed it's all at the end. Where's the best place to put a preventer, at the end of the boom.
Get a metal pipe, put a weight on the end. Swing it like a bat and hit something at the end of the pipe. Now do it again hitting something somewhere in the middle of the pipe. Which time did the pipe fold up?