All the little ships

I try to gain superiority in fleet size ASAP; thus I discovered that if ,on starting a new game, you purchase a Small ship ( don't forget to gain cash by selling off Penteconters/Unireme you may start with )and then Save and go to Main Menu ( do not hit the Resume button ) and then return to the same game you will be able to purchase another Small ship. Repeat this process until you have 4/5 in your fleet.You can do something similar on later turns but you will get the ship type rotation.