Hi Matt,
You posted in the C30 forum. Seems like the right place to me.
This is my first season with my 1993 C30 with the M25XP Universal. This is my first boat with an inboard motor. Previous boat was a tiller steered, outboard powered O'day 25. So, the previous posters have loads more experience than I do but I do have a C30.
On the sea trial last November the surveyor noted WOT was 3500 rpm 6.8 knots and a cruising speed of 2300 rpm 6 knots. The speed came from the boats knot meter and this was on flat water.
I changed the alternator over the winter so I believe the tach is off a little and the knot meter stopped working after the first week so my speed is now coming from the GPS.
What I see now is: WOT is 3200 RPM for 6 knots and I run between 2500 - 2800 rpm for 5.5 knots.
Over the winter I read every thread on this Catalina 30 forum. While there has been discussion on different props, pitch and size most were related to reducing prop walk in reverse and balancing forward speed under power and under sail. I don't recall anyone noting a change in a prop causing problems holding a course in forward.
You posted in the C30 forum. Seems like the right place to me.
This is my first season with my 1993 C30 with the M25XP Universal. This is my first boat with an inboard motor. Previous boat was a tiller steered, outboard powered O'day 25. So, the previous posters have loads more experience than I do but I do have a C30.
My prop is a 3 blade marked MI/FED Sailer, 13RH10. Pretty sure I read where this was the standard 3 blade.This is good because even turning 3000, I can’t get more then 4.5 knots out of it. Is this normal?
On the sea trial last November the surveyor noted WOT was 3500 rpm 6.8 knots and a cruising speed of 2300 rpm 6 knots. The speed came from the boats knot meter and this was on flat water.
I changed the alternator over the winter so I believe the tach is off a little and the knot meter stopped working after the first week so my speed is now coming from the GPS.
What I see now is: WOT is 3200 RPM for 6 knots and I run between 2500 - 2800 rpm for 5.5 knots.
I keep a straight course under power with one lazy hand on the wheel.There is so much prop wash when motoring it takes 2 hands and a tiring amount of work to keep the boat from turning to port.
Over the winter I read every thread on this Catalina 30 forum. While there has been discussion on different props, pitch and size most were related to reducing prop walk in reverse and balancing forward speed under power and under sail. I don't recall anyone noting a change in a prop causing problems holding a course in forward.