within a few hours the metal cast in the mold will cool by several hundred degrees but it will be two weeks before the men can peel the crankcase from its mold only then will it be hard and elastic enough and extremely durable LaShonda la Valette is surging through the Mediterranean at a rate of over 40 knots the high speed ferry is heading for the Sicilian port of Port Salut it's not a propeller that the four mega diesel engines in its hull are driving but water jet power units which function on the recoil principle