answersLogoWhite

0

For a 1978 70hp Mercury motor with a blue band, a common propeller size is a 10.5 x 13 or 10.5 x 15, depending on your specific performance needs and boat type. It's essential to match the propeller pitch to optimize RPM and speed for your setup. Consider aluminum props for durability and cost-effectiveness or stainless steel for better performance and efficiency. Always consult your motor's manual or a marine specialist for the best recommendations based on your boating conditions.

User Avatar

AnswerBot

4d ago

What else can I help you with?