Capt. Rodbone
Senior Member
- Joined
- Sep 6, 2020
- Messages
- 172
- Location
- U.S.
- Vessel Name
- SV Stella Polaris MV Sea Turtle
- Vessel Make
- 1978 VanDine Gaff rigged schooner, 1978 Grand Banks Classic Trawler
My wife and I are on our first official road trip to look at a trawler. I’ve been a registered user here for a few years in anticipation. We have been sailers for over 40 years, And I’ll keep our coastal and easily singlehanded sailboat for the foreseeable future. Here’s my questions, which illustrate my sailing background.
Do power vessels have a “ hull speed” and is it the same formula as with a sailboat? My brain doesn’t function well in this arena.
I’m mostly just curious about the above, but here is my main question.
The Grand Banks 42 we will see today has twin Ford Lehman’s each of 120HP. They list a cruising speed of nine knots. In my very limited knowledge that sounds about right.
The other Grand Banks 42 has twin CAT 3208’s stating 375 HP. It says a cruising speed of 18 knots? That sounds quite fast for a trawler regardless of all the additional horsepower. I also know they all have optimum RPM’s, giving the balance between speed and fuel consumption, but sure that will differ between the two as well. Any follow up will be helpful, including thoughts on what optimum cruising speed and fuel burn would be.
Do power vessels have a “ hull speed” and is it the same formula as with a sailboat? My brain doesn’t function well in this arena.
I’m mostly just curious about the above, but here is my main question.
The Grand Banks 42 we will see today has twin Ford Lehman’s each of 120HP. They list a cruising speed of nine knots. In my very limited knowledge that sounds about right.
The other Grand Banks 42 has twin CAT 3208’s stating 375 HP. It says a cruising speed of 18 knots? That sounds quite fast for a trawler regardless of all the additional horsepower. I also know they all have optimum RPM’s, giving the balance between speed and fuel consumption, but sure that will differ between the two as well. Any follow up will be helpful, including thoughts on what optimum cruising speed and fuel burn would be.