Engines V: Lessons Learned - The Trial

This will be the last blog on engines for a while.  We know that we have inundated you with engine informatio, but hope the information is helpful to you.  If you have any questions please feel free to contact us or write questions in the comments.  We will either answer your question in a separate blog or right on the thread.

As a recap, we have discussed several aspects of engines:  fuel efficiency, fuel type, engine type, and calculations.  But one thing we discovered during engine trials are the lessons that we learned.

One of the most fun and truly challenging parts of building the Grampstr's Pride was the Trial phase.  What made this fun was that we had some really cool experts on our boat to show us how to run the equipment and do some fine tuning.  During this process we had the opportunity to watch the experts at Endeavour, Cummins, and Twin Disk make the Grampstr's Pride ready and sea-worthy.  While working on the vessel we learned a few things that affect the engine - what, you ask? Efficiency!

This is where we learned about the sweet spots for running the motor, prop size and pitch, and most importantly how much horse power was too much.  This is what made these trials so fascinating to us as owners and captains. The experts worked out kinks: such as propeller pitch, transmission controls, and jet thruster conversions.  In the end the issues were totally worth it and we are so excited to have had everyone on the Trawler at once. 

Although this is the last blog on the engine series, you can look forward to future blog posts when we will talk about all of the great technology on the Trawler.

 

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.

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.