Retractable wheel assembly for an amphibian

A retractable wheel or track drive assembly for an amphibian, comprising:

• an actuator;
• a retraction linkage assembly movable between a protracted position and a retracted position;
• a suspension assembly at least partially connected to the retraction linkage assembly and movable between a protracted position and a retracted position;
• and
• at least one wheel or track drive, wherein:
• when the retraction linkage assembly and the suspension assembly are protracted then the retraction linkage or suspension assembly or both supports or holds the at least one wheel or track drive in a ground engaging position for use on land;
• at least one component of the retraction linkage assembly is arranged so as to be spaced from the suspension assembly;
• the actuator comprises a non-actuating end and an actuating end;
• the suspension assembly comprises at least one of an upper control arm, a lower control arm and a suspension upright;
• the non-actuating end of the actuator remains above at least a portion of any one of the upper control arm or the suspension upright in the protracted position and the retracted position of the retraction linkage assembly;
• and
• at least one component or part or portion thereof that passes through a centre position to an overcentre position on protraction to prevent forces received in use via the at least one wheel or track drive from acting to retract the retractable wheel or track drive assembly.