Siguy and Taiki,
Quote:a thought just came to my head about why the spear gun can shoot farther under water than it can on land:
under water, the effects of gravity are dramatically reduced, and that is why it is able to travel so far under water and not out of water. also, the reason that underwater darts don't need fletching to keep them going straight is because of the dramatically increased drag that water has on things, which forces the dart to go point first, or sink immeiatly.
I can promise that all of gravity is still there. A spear will most definitely fly further if shot from land. Fletching isn't needed mostly because of the drag imparted by water, but also by the short ranges being used. I may make one of these at some point.
A spear with a head that detaches and runs on a spool of line makes the most sense to me, but I suppose it depends on what/where your spearing.