An amphibious motorcycle with a hull that provides desirable buoyancy for the vehicle to float while in the water and yet allows the vehicle to lean/turn during use on land is provided. The amphibious motorcycle has a front wheel with a front suspension system and a rear wheel with a rear suspension system. Also included can be at least one wheel retraction system that is operable to move the front wheel and/or the rear wheel between a deployed position for use of the amphibious motorcycle on land and a retracted position for use of the amphibious motorcycle on or in the water. The amphibious motorcycle also has a hull that can have a center portion with a center bow and two oppositely disposed and spaced apart side portions each with a side bow.

A modular bicycle and board apparatus having a buoyant board, a front wheel, a rear wheel and handlebars mountable and usable in a first configuration as a bicycle in which the buoyant board is the bicycle's frame and in a second configuration as a surfboard by changing the orientation of the front wheel and handlebars with 90 degrees with respect to the buoyant board, the surfboard being steerable from the handlebars.

A human powered aerodynamic amphibious recumbent vehicle having an outer shell that operates as the cycle exoskeleton, aerodynamic fairing, and boat hull. The vehicle includes a propulsion design adding paddles to the front drive wheels or pairing traditional pedaling to a propeller mounted on a kayak rudder via a flexible axle. Composite materials are used to form the vehicle and allow it to remain lightweight, abrasion tolerant, structurally rigid under rigorous operating conditions, and waterproof. The vehicle can enter and exit the water by riding directly in and out, or can be lifted by one person safely.

A power train for an amphibian operable in land and marine modes includes a prime mover having an integral speed change transmission, at least a first land propulsion unit, at least a first marine propulsion unit, and a power transmission unit including a drive member configured to couple the prime mover to the at least first marine propulsion unit, wherein the prime mover is arranged to drive the at least first land propulsion unit through/via the integral speed change transmission in the land mode, and the prime mover is arranged to drive the at least first marine propulsion unit through/via the power transmission unit in both the marine mode and the land mode.

A wheel (10a, 10b) for amphibious vehicles (1) has a rim (100) and a tire contact surface (102) for driving over a solid surface. At least one float (101) designed to hold air and/or gas is provided on the wheel (10a, 10b) and, when required, able to be brought from a neutral position to a floating position. The float (101) is formed from numerous profiles (1010) pivotable at a defined angle (W) to the wheel plane (E) on the circumference of the rim (100) and/or on the circumference of a receiving means (1000) extending inside the inner circumference of the rim (100). At least one water-tight and flexible and/or elastic material (1012) is arranged on the profiles (1010) and/or connected to the profiles (1010) to form a floating cavity (1011).

Provided is an amphibious bicycle and, more specifically, to an amphibious bicycle characterized by including: a first floating means that is mounted to a front wheel frame rotating along with a handle and unfolds due to buoyancy upon entering water, thereby keeping the front wheel frame afloat; a second floating means that is mounted to a rear wheel frame and unfolds due to buoyancy upon entering water, thereby keeping the rear wheel frame afloat; a propulsion means that propels the amphibious bicycle forward when the amphibious bicycle enters water, and a steering means by which the amphibious bicycle can change direction while moving forward in water, wherein the amphibious bicycle can transition directly from traveling on land to entering and moving across water without any additional work or replacement or addition of components.

The present invention provides a novel multiple-seat wagon propelled by simultaneously rowing and pedaling for use in water or land. The present invention provides a unique and versatile multiple-seat wagon that can be converted into a sea vessel. It allows the vehicle to float on water and serves as the lower part of the vessel. The water propulsion assembly includes two water wheels that are responsible for generating forward and backward motion when the vehicle is in water. It also has a water shaft that holds the water wheels. The pinion gear increases the rotational speed of the water wheels, enhancing the efficiency of propulsion from a pedaling motion and a rowing motion. The invention features a demountable coupling system that allows for disassembly and reassembly while maintaining the interconnection of its components.