Boatbuilding Tips and Tricks Blog

Here are the latest few blog posts. The balance of this years, appear below the list of posts and the column on the right, the index, lists all posts since 2008 when I started this blog, over 400 posts and 9 years.

Sunday, August 20, 2017

What does your "Calc Max Power" note mean?

I got this email yesterday, and thought it would be of interest to others:

Hi Jeff,
Just wanted to ask what is exactly the "Calc. Max. Horsepower" you have on all your Study Plans?
And what is the maximum engine I can put on the Ixtapa Super Panga?
Thanks in advance and Best Regards.

Here is my response:

Hi K____,
Thank you for your interest. I calculate the maximum horsepower that the hull can use based on the Coast Guard maximum horsepower calculation method described in their Homebuilt Boat Safety publication. I have not tested this horsepower, nor am I sure that this much horsepower will be safe in the boat that you construct. It is my estimate only. I also recommend some horsepower to use in the design. I would use the recommended horsepower, but you may increase it up to the maximum horsepower as recommended by the calculation. It is up to YOU to be sure that you build the boat properly in accordance with the plans, that you select the appropriate lumber, cut the elements to shape appropriately, glue and screw the hull in accordance with the methods and materials selected, and test the use of any more power than I recommend. Please ensure the boat is in appropriate trim, and appropriate water conditions to see if a higher than recommended horsepower works.
Best of luck with your build.

Hatteras v-bottom Dory Wooden Boat Plans

You can obtain the Coast Guard publication in my insider section, here: Homebuilt Boat Insider Page.

Jeff Spira, Naval Architect, marine engineer and boat designer

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