New Shore Defense against boats

[Pete F.]

Something similar to the sabots used for shotguns and muzzleloaders might work. Just a little bigger, you could probably use a leash on the sabot so it was reusable. And charge the cannon with nitrogen rather than dealing with a pump and batteries.

[ReelinRod]

It's easy to impressively dump a short-spooled reel loaded with 80+lb braid. The distance claims for these things are greatly exaggerated.

The only application this contraption would be good for is shark fishing with large frozen/fragile baits like a whole herring or 1/2 a mackerel or bunker. The need to keep the pre-rigged bait and sinker frozen necessitates a powered freezer or dry-ice.

Really, for this thing's price tag, just get a decent distance set-up and learn to use it.