Abstract: A boat having bottom and side panels. A yieldable diaphragm has a seal between the diaphragm and the panels. A motor mount on a rear seat board projects rearwardly and beyond the diaphragm to present a support for a motor. A sailboat has a rudder controlled by a tiller. Another motor mount is rotatably mounted on the sides of the boat so that it serves as a seat or a mounting panel for a boat. A diaphragm can be placed on the bottom of the boat and then shifted rearwardly so that tongues or projections of rubber on the bottom and sides of the diaphragm can be moved rearwardly and received in sealing relationship with forwardly facing, open end slots on the bottom and side panels of the boat.

Abstract: A tubular vent device extends through a hole in the hull of a boat, well above the water line. The outer portion of the vent device has a circular ridge or shoulder larger than the hole through the hull to hold the outer portion outside of the hull. The inner portion is threaded to accomodate an inner nut with a collar or washer larger than the hole to let the nut draw the inner collar and outer shoulder tight against their opposing sides of the hull. The inner portion terminates in a coupling for a hose to connect to a tank to be vented. The outer portion of the vent, beyond the shoulder, is also threaded to receive a cap that has a series of fine, axial slots through its outer surface for ventilation. The end of the outer portion of the vent also has a tapered conical portion within the cap, with a pair of axial ridges on the outside just above a pair of axial ventilating slots that open the tubular vent to the fine slots in the cap.

Abstract: A tight insulator (10) is equipped with a ventilation circuit having an intake pipe (14) and an exhaust pipe (16), in such a way that the internal insulator volume (12 ) is under an overpressure with respect to the outside. In order to rapidly discharge objects from volume (12), a discharge tube (28) is provided, which is closed by a door (34) and to which is connected the exhaust pipe (16).

Abstract: A device for hydraulic conveyance of loose materials comprises a vertical chamber having a cylindrical side surface and hemispherical a bottom and a cover and is provided with four respective pipes for liquid discharge, loose material charging, feeding the pressure liquid flow and slurry discharge in an upward flow. The pipes are held to the hemispherical cover and are arranged coaxially in such a manner that the loose material charging pipe is accommodated inside the liquid discharge pipe, the pressure liquid flow feeding pipe is accommodated inside the loose material charging pipe, and the slurry upward flow discharging pipe is accommodated inside the pressure liquid flow feeding pipe, all of the pipes being arranged coaxially with the longitudinal axis of the chamber and having some of their portions located inside the chamber. The length of the portions mentioned above increases consecutively from the liquid discharge pipe towards the slurry upward flow discharging pipe.