After reading and following this forum for a long while (thank you for such a great resource) I became enthralled by progressive powerboat design. The purpose of posting this thread is to post the fuel economy results of the boat I bought and how its design has either advantages or drawbacks.
The things that inspired me were the ability to go long distances in a boat while living simply and being frugal with fuel consumption. (enabling the user to get out on the water more without denting the pocketbook so much)
I had always loved the 'go anywhere design' Tad Roberts' Passagemaker Lite but knew that a 'newly' built one would likely be out of my price range forever. As I scoured the used boat market, I had always looked for single diesel straight shaft boats that could sleep a few people and could be single handed and hopefully trailered to cut down on transport costs. The design I had always linked to extreme fuel efficiency was narrow beam, lengthy LWL, and high ratio of beam to LWL. In this case 7.5'(at its widest) by 42' = 5.6. (with the low wake, as I understand it, being a tell-tale sign of good fuel efficiency)
Here are a few links that I always looked at and saw beautiful design efficiency:
Blue Whale overhead:
Nigel Irens - Molly Ban: https://www.youtube.com/watch?v=EltG5I-xMk4 http://www.nigelirens.com/wp-content...Ban-Ext-01.jpg
Dashew FPB 64: https://www.youtube.com/watch?v=XrYE39_0wRk http://avatarlogs.com/wp-content/upl...ch-day-148.jpg
At nights I had been blissfully perusing boats, all the wile understanding completely that passagemaking under power is often a wealthy persons past-time due to significant costs. Then one boat in particular caught my eye. It was long, light, efficiently powered, and wasn't $1MM. I had watched this boat sit for a while looking for its perfect owner (as custom boats often require) and after a lots of deliberation and the all-critical-approval from the wife, I decided to give the owner a call. I flew out, rode in it, and ended up buying it. (I am well aware it is not
nearly as blue-water capable as the boats it emulates such as Tad's PML and Dashew's FPB.)
The specs of the boat are as follows:
42' Carbon Fiber, fiberglass, and linear foam construction - Total weight ~ 5,000 lbs - Designed by Dick Newick
4 fuel tanks - 50 gal/each (200 total)
Yanmar 4LHA-DTP turbo diesel - 158 continuous rated HP
I have been really happy with the performance of the boat and am continually getting more in-depth understading of the various on-board systems.
I cant wait to push its boundaries farther and farther along the pacific coast and beyond!
Here are some pics and the fuel economies I have been testing against the below performance curves and fuel consumption chart: http://www.yanmarmarine.eu/theme/yan...r-4LHA-DTP.pdf