slow moving under full engine power

[ekkeb]

Catalina 30 1989 Universal 25XP engine.
It was normal moving until in the mid of July start moving slow even at full trotlle (2500RPM).

 

[Stu Jackson]

Help us to help you

You should read this, which explains in great detail and well explained how to ask questions and why information is so important for us to help you: http://forums.catalina.sailboatowners.com/showthread.php?t=101373

Your question was so cryptic that I'm not quite sure what the question is?

After you've read the link, please come back and fill in the blanks for us to help you.

Diesels need two things to run: air and fuel. When was the last time you changed your fuel filters? Note the emphasis on multiple filters.

Is your fuel pump working properly?

 

[foolproof]

Sounds like it's making power, but not moving well. Could the bottom be so covered in algae and such that it would make too much drag? How does it sail, does it still make good hull speed under sail?

 

[Jimm]

Catalina 30 1989 Universal 25XP engine.
It was normal moving until in the mid of July start moving slow even at full trotlle (2500RPM).

Clean your prop......bottom too.

 

[rpell1@msn.com]

I think I know what you are asking about.....

Since my boat is slipped not far from you, I am in Sheepshead Bay Brooklyn, I can offer this as a strong possibility why your BOAT is moving slower.

This year has been an unusually active for the growth of barnacles in our area. The boats in our Club have ALL had their props fouled to the point on non-recognition and had to be scraped. My Cat30 was one of them. Like you, at full throttle, I made about 3.5 knots in relative calm.

Once our resident diver inspected and spent almost 1/2 hour scraping, my speed was back to it's normal 5.5 at 2200.

That was about 2 weeks ago and guess what?.......My speed has started to slow a bit...again! I guess it's time to inspect. Thank God the water temps are dropping. Maybe now the growth will slow down.

Clean the prop and you'll enjoy the speed again.

Happy Sailing,

Catalina 30 1989 Universal 25XP engine.
It was normal moving until in the mid of July start moving slow even at full trotlle (2500RPM).