Fixed Pitch Propellers

In designing propeller, operating conditions of ship hull, engine, shafting etc. are to be considered carefully. MHl undertakes the design of the propeller, based on customer's specification, using accumulated technical knowhow and experience in shipbuilding.
Two methods of designing propellers are well known, i.e. propeller design based on

(1) Propeller chart, and
(2) Propeller lifting line and surface theory.

This propeller chart is used for initial design of a propeller and also detailed design of the conventional propeller. The wake-adapted type propellers and also highly skewed propellers are designed by using propeller lifting line and surface theory.

Layout of propeller manufacturing shop

MHI owns low-frequency electric induction furnaces, numerical-controlled milling machine, specially designed boring machine for boss parts, and vacuum quantorecorder for metal quality test.
MHI also developed Hot-Top system which is an arc heating method equipped with carbon electrodes, to control solidifying rate of molten metal and to improve the quality of the material. The largest propeller which MHI is able to manufacture, is 12.0 m in dia. and 100 tons in weight.