In many areas of the world, boats with twin main engines are seen to have advantages over single-engined boats. For the pair trawlers of Hong Kong it is not a question of one or two engines - for many years the fleet has used three engines per boat. Shun Fung Engineering Ltd., Cummins' major Hong Kong marine dealer, has been the pioneer in the Hong Kong fishboat marine engine market. Otto C.Y. To, Deputy General Manager of Shun Fung Engineering, explains that the three engine configuration evolved when captains of the early powered fishing junks found that the large single net tended to pull the boats toward each other requiring constant rudder angle and thus reducing towing efficiency. To correct this, each boat added a second smaller engine on the side from which the net was towed.