A steering system for amphibious vehicle includes a control connected to
road steering means. Ram is conventionally used to assist road steering,
but by disconnecting command valves, it becomes a hydraulic master
cylinder, driving slave cylinder; and thus marine steering means. Valves
and hydraulic reservoir enable the marine steering to be disconnected from
road steering. The marine steering means may be center biased by springs.
A sensor and control means may synchronize center positions of road and
marine steering. The valve and port layout may also achieve this goal.
Alternatively, power steering in road mode may be maintained by fitting a
master cylinder in parallel or in series with steering means; and may have
hydraulic, electro-hydraulic, electric, or magnetic assistance.
