Most people (when fishing from the front of the boat) wrap the rope around the motor and tie it off up closer to you in the front of the boat. If you start going too fast, just let out a little bit more line. The chain will not spook fish, but this technique is usually used for spider riggin, so the baits have already come thru the column of water a while before the chain makes it (because it is draggin a pretty good distance behind the boat). The chain usually will not hang-up. This technique is used on a lot of southern oxbows simply because of all of the stumps and brush piles. It may break a few twigs off, but it wont do any major harm to the brushpile. If the boat is fiberglass, it probably sits low enough in the water that the 10' of chain will work. Be sure to bring a 5-gallon bucket along because the chain can get fairly muddy.