Location: The Netherlands Cheap to run, cheap to build electro plywood cruiser ? I have been a member for a while now on this forum and have read many threads with interest.
Since I am no naval architect at all, could you give me some usefull feadback on the initial sketches and see where I made huge mistakes or if I am on the right track ?
Guest625101138 Previous Member   What do you want to carry - displacement?
Location: Kristiansand, Norway I had an aricle lying around somewhere, believe it was in the Wooden boat magazine, Think it was on the frontpage also. Guest625101138 Previous Member   I did a rendering of the hull based on a somewhat different underbody that I think would give good efficiency at 6kts for the other constraints specified. Using VRLA batteries you will get say 20kWh for 500kg and this is the size you need to get fair battery efficiency at 6kts. An 8m boat of this beam and displacement will start to makes waves above 5kts and that takes energy. If you want to do 6kts efficiently then you need longer hulls - say 10m or go for a catamaran.
With things like this I normally start with the most efficient hull for the speed and displacement without any constraint and then decide what each feature costs in terms of performance. Would it be very bold to send you the hull sections as in the attached JPEG with my thread, or do you consider the minimal differences of minor importance ?
I understand your philosophy, and I already started with a narrower hull, but considered space and ease of building (so relative square flat sections) important to sacrifice in performance. Another thing I do not have the knowledge for is the situation that the 5 kts is a good optiomal cruising speed, but what happens to the power requirement when you run in a very strong countercurrent or wind ? Thanks for the link, I had that one for 2 years now, also one of the inspirations and a proof that it is possible. Guest625101138 Previous Member   I could not resist looking at something more like the optimum hull based on the concept. The difference with this second one to the first one is that it will rely on the outboard hull for stability. I am not certain about the seaworthiness for heavy weather but once you stick 500kg in the bottom of a small boat it really stiffens it up.


As you can see if you go longer you can reduce power required and therefore battery weight.
If you determine what are really hard constraints then it can be pushed and pulled to suit. Thanks for all your input and I also think it has huge potential as this kind of electric vessel is not on the market at the moment and suits a big crowd needs. I will be on a short holiday this weekend and thin kthings over, will come back early next week on this !
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When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Our shipwright Matthew Hobart has been documenting the build of Nat’s Design #86 on Instagram, including great descriptions of the project process. The objective is to restore this lovely, all teak, heavily ballasted, Sparkman and Stephens yawl to prime sailing condition.
We decided on a traditional approach to the restoration; a combination of double sawn full length frames with steam bent frames between. Simultaneously, the deck has been totally reframed using White Oak and Black Locust for the deck beams, and Angelique for the carlins. The crew took down the winter walls on the Beach Rd shop today, which allowed for a nice distance shot of the Design No. As traditional builders of plank on frame wooden boats, it’s always fun to get the steam box fired up to bend some wood. Our Matt Hobart and Lyle Zell are hearty souls as they continue to loft the 19′ Gaff Sloop No. Here is a Flipagram clip of the day she was hauled out of Vineyard Haven Harbor at the Martha’s Vineyard Shipyard and brought over to Mugwump. Above photo taken at the Sail Martha’s Vineyard 2014 Annual Sea Food Buffet Fund Raising Dinner. Ross and Nat were honored as this year’s recipients of the Walter Cronkite Award which was presented to them by Matthew Stackpole, Curator of the Mystic Seaport Museum.
SEPTEMBER 19, 2014 Some photos from the summer events at the boatyard, and the 2014 racing season for you to enjoy.


The salon top can be covered in solar panels, the big side windows aft could be of the opening type like in cars (manually of course ! 6 hours of running at 6 knots or so, solar panels to give a bit of extra range and ppower on board for electrocnics. That is to say that the width of the flat sections are smaller and will require less framing than a wider flat section. The model is about one meter long and was propelled by an electric motor with radio control.
Her original specs called for steambent Ipol frames, copper riveted teak planking, with a Yakal backbone, teak deck and joinery. In addition, all the frames in the hollow will be grown Live Oak or Locust, adding strength where it’s most needed. Before we could begin reframing the forward end, the forekeel needed to be replaced. Fortunately, we had on hand a 10” x 20” x 24’ Angelique timber for this. Photo by our shipwright, Matt Hobart.  Matt has been doing an incredible job actively photo journaling this boat since its lofting and has provided detailed and interesting descriptions of each stage in the process. Here is a link to Nat, Brad, Matt, Lyle, Alex, and our apprentice Ariel bending the batten keel for the Design No. I guess the waterflow towards the prop becomes more efficient then and together with a thrusttube around teh prop it should give some more efficiency, thus pushing the power graph a bit upwards in speed ? I reckon it ought to have some aft rocker to get the transom reasonably clear of the water. On the other hand the larger number of corners (chines) will increase eddymaking and contribute to drag.
They had an article about a electric boat like that, trailerable, beam approx 7-8 feet maybe, long sleek and narrow, ply design(?) epoxy sheated, it was quite ok looking also. With the demolition end of the rebuild complete, we’ll be laying out a new interior, and starting to frame and install new deck beams and carlins for the newly designed house. Pressing the speed much beyond that caused a big wave train, clumsy behavior and rapidly drained batteries.



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