Abstract: A retractable hydrofoil for marine vessels asymmetrically mounted for-aft on opposing sides of the hull of the marine vessel and a control unit for retracting the hydrofoil from a deployed position to a retracted position.

Abstract: The device for electronically simulating a component position includes a first counter (40,42) which counts counter pulses (Zt) determined by respective occurrences of a periodic event marking respective component positions; a second counter (30) which, in response to occurrence of a first event (e2), starts a third counter (34) which counts at a counting rate faster than that of the second counter (30) so as to repeatedly run through a predetermined value range (Z') until occurrence of a subsequent event (e3) and which produces a basic clock pulse (Co) each time a final value (y) of the predetermined value range (Z') is reached; and a readjustment circuit (38) which produces the counter pulses (Zt) from the basic clock pulses (Co).