Witzend
Good point to keep in mind.....my only worry would be hitting the resonant frequency and that means a real in the water test.
The reason I would like a prop change is .....what am I looking for in making the change?
This guy raises some good design thoughts.....
http://l-36.com/rebuild_joe.php
"Let's discuss the Catalina 30, an extremely successful design of 6000+ hulls built. Hull speed of this boat, with her 25-foot waterline, is a theoretical 6.5 knots. The boat needs only 12 horsepower to reach hull speed, under ideal conditions [clean bottom, flat water, no wind, correct transmission reduction ratio, and correct prop]. Now, let's add a bit more horsepower to ensure the boat can reach hull speed under less than ideal weather conditions. Sixteen horsepower is adequate. Twenty horsepower is ideal for this boat, as boat speed is maintained under most conditions, while also charging batteries. Remember, the boat is still an auxiliary powered sailboat, not a powerboat. If you must make headway under power into 25+ knots of wind, and the resulting waves, you need a powerboat...and a seatbelt!"
paulj :troll:
Good point to keep in mind.....my only worry would be hitting the resonant frequency and that means a real in the water test.
The reason I would like a prop change is .....what am I looking for in making the change?
This guy raises some good design thoughts.....
http://l-36.com/rebuild_joe.php
"Let's discuss the Catalina 30, an extremely successful design of 6000+ hulls built. Hull speed of this boat, with her 25-foot waterline, is a theoretical 6.5 knots. The boat needs only 12 horsepower to reach hull speed, under ideal conditions [clean bottom, flat water, no wind, correct transmission reduction ratio, and correct prop]. Now, let's add a bit more horsepower to ensure the boat can reach hull speed under less than ideal weather conditions. Sixteen horsepower is adequate. Twenty horsepower is ideal for this boat, as boat speed is maintained under most conditions, while also charging batteries. Remember, the boat is still an auxiliary powered sailboat, not a powerboat. If you must make headway under power into 25+ knots of wind, and the resulting waves, you need a powerboat...and a seatbelt!"
paulj :troll: