Engines Part II: The Need For Speed?

Briefly, in the last post we discussed the basic concept of efficiency, particularly that efficiency in trawlers is measured in Gal/Hour.  When it comes to boating in general the efficiency of a vessel is measured in Gal/hour, or as stated Gallons per hour.  The reason for this is that distance and speed is not an effective measure of engine performance.  The pros over at boatingmag.com have this to say:

"You measure fuel efficiency in pounds of fuel used per horsepower developed per hour. The pros call it 'brake-specific fuel consumption.' This makes it important to know that gasoline weighs about 6.1 pounds per gallon and diesel fuel 7.2 pounds per gallon."

As indicated by the equation for gal/per hour this calculation allows you to determine fuel burn for both stopping and while in idol.  This model also allows you to measure your efficiency at different speeds/rpm.  We are very happy with our diesel Cummins engines.

The Grampstr's Pride operates at  5.9 Gal/Hour at 8 Knots/Hour (approx. 10 MPH), which is our recommended cruising speed. While at full speed of 19 Knots/Hour (22 MPH) the vessel operates at 38 Gal/Hour.

However, we should mention that there are two cruise "sweet spots." The first at 1350 RPM 8Knots (10 MPH), which expends as described above 5.9 Gal/Hr. The second at 2200 RPM when the vessel will travel 15 Knots  (17MPH) for 19 Gal/Hour.

Based on this information it is easily determined that although it is fun to go fast the cost of fuel may outweigh the need for speed! But the moral of the story is also to FIND THE SWEET SPOT!

We hope you will contact us soon and consider chartering.

Engines Part I: What does every boat need? More Power...well maybe

So let's start this blog with one of the most important items on a boat: the engine. When discussing trawler engines, just like with car engines,  the most important factors are type of fuel, efficiency, gallons per hour, and horsepower. In the next several posts we will discuss all of these items and their importance in choosing the best product for your vessel.

The Grampstr's Pride has two Tier 3 Cummins QSB 6.7ltr Turbo marine Diesel engines. In future posts we will discuss the reasons for the Cummins engines, but for today we will focus purely on power.

The Diesel Cummings engines we selected have that original 380 HP and can be boosted to 425HP.

So while on trial with some Cummins Experts on the boat they recommended that we increase from the original factory settings to 380HP which allowed a max output of 1335 LBS of Torque at 2000 RPM.  At this horsepower the props would spin at approximately 2890RPM.  According to the boat experts this was not enough and it should have ran 3000 RPM.  So at the 380HP the boat would not perform to the level of its highest efficiency.  

By raising the horse power to 425HP we were able to get our torque to 1424lbs at 2000 RPM.  This amount of horse power allowed the propeller to spin at the perfect RPM of 3000 RPM at max speed the engine to perform at an optimal performance.

So once we raised to 425 HP we asked the obvious question:

"Should we give it more power?'

The answer was simple: No! The reason being is that it will not at all help with engine performance. In fact, we were told it would actually make the vessel less efficient.  According to the experts, any more horsepower would not result in any more RPM output for the props, which means any extra HP at that point is just overkill and a true waste of fuel.  So we just needed a little more power!

If you would like to learn more or have questions please post your questions or comments in the section below.  We would also love for you to contact us about Chartering the Grampstr's Pride.

The Captain's Blog

As we said on our about page we have two types of blogs. The first:  Adventures. This is all about our travels around Florida.  It encapsulates our favorite part about yachting and the fun parts associated with boating and chartering a beautiful trawler.  The second: The Captain's blog. This will be all about the options available for purchasing a charter, particularly our journey from Grampstr's Endeavour to the Grampstr's Pride.

We will also be discussing the equipment choices associated with the building of Grampstr's pride and all of the fun we had during the process.

Finally, we will also post blogs about different issues that arise with boat ownership.  As we said we want to make this blog a great place for prospective buyers of trawlers.  

We also hope you will take an opportunity to charter with us and learn about the great opportunities and lifestyle yachting has to offer.