Abstract: A watercraft includes: a watercraft body; a pontoon frame system coupled with the watercraft body, the pontoon frame system including: a plurality of pontoons spaced apart from one another; and a chassis coupled with and at least partially supporting the watercraft body, the chassis supported by and coupling together the plurality of pontoons, the chassis including a cross-hatched assembly.

Abstract: A watercraft includes: a watercraft body; and a pontoon frame system coupled with the watercraft body, the pontoon frame system including: a plurality of pontoons spaced apart from one another and including a forward end, a rearward end, a first outboard pontoon, and a second outboard pontoon; and a chassis coupled with and at least partially supporting the watercraft body, the chassis supported by and coupling together the plurality of pontoons, the chassis including a composite body coupled with the first outboard pontoon and the second outboard pontoon at the forward end and the rearward end.

Abstract: In a preferred embodiment, a slapper detonator, including: an inverted, vertical, open cup filled with an explosive, the mouth of the cup being adjacent the upper surface of a horizontally disposed explosive foil initiator (EFI); an integral flange extending circumferentially horizontally outwardly around the mouth of the cup; a cover plate having an opening defined therethrough and attached to the upper surface of the EFI, through which opening the cup extends vertically; and a counterbore defined around the perimeter of the opening to engage the flange and hold the mouth against the upper surface, such that lateral forces applied to the cup will be transferred to the cover plate. In another aspect of the invention, there is provided an EFI for a slapper detonator which has solderable electrical terminals. The EFI may be of laminated structure with the terminals laminated to the structure. In a further aspect of the invention, there is provided an improved barrel structure for an EFI.