Sailors Powerboat

Boathavn

Hof & Gammel Dansk - Skål !
That is us.  Paul and Eric's genius created a great boat
Hey, do you think you could build one of these?

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nige

Super Anarchist
As a lifelong sailor on the quest for the "perfect" day boat we developed and built our Momentary lapse of Reason:  A 30 ft powercat for Florida waters.  She easily cruises in the ocean at 22-24 kn and 5nm/gal.

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What RPM’s are you cruising at with those 90’s and those numbers?

if you’d share it would be great to hear how that changes through the range (speed, rpm, nm/g) (I know you said it’s designed for that cruising speed, just curious)

there aren’t too many similar boats to get comps with and as I think about another build I’d love any other anecdotal data!

thx

 

fastyacht

Super Anarchist
12,928
2,596
3200 rpm nice--definitely down around 50 hp total. Props is nicely oversquare but not overloaded and should be in the 70% efficiency range too.

 
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[email protected]

Super Anarchist
1,150
523
43 south
I know Irens designs have been mentioned here, but I can't remember if "Wilhelmina" has featured. Irens sums up the point of this thread: 

“I’m on a personal crusade to help people understand that there doesn’t need to be this huge cultural divide between a sailing boat and a well-designed motorboat,” he says. “I believe a motorboat can give you a real sense of well being in the same way a good sailing boat does.”

Wilhelmina-sailors-motor-launch-nigel-irens-design-side-view.jpg


To my eye the windscreen aesthetics could be tweaked a little. 

https://www.yachtingworld.com/boat-test/wilhelmina-nigel-irens-motor-launch-120503

https://www.seahorsemagazine.com/raceboats-search/ad/31-to-55,19/wilhelmina-nigel-irens-31ft-ldl-motor-launch-2017,1373

 

ProaSailor

dreaming my life away...
6,106
793
Oregon
I know Irens designs have been mentioned here, but I can't remember if "Wilhelmina" has featured. Irens sums up the point of this thread: 

“I’m on a personal crusade to help people understand that there doesn’t need to be this huge cultural divide between a sailing boat and a well-designed motorboat,” he says. “I believe a motorboat can give you a real sense of well being in the same way a good sailing boat does.”



To my eye the windscreen aesthetics could be tweaked a little. 

https://www.yachtingworld.com/boat-test/wilhelmina-nigel-irens-motor-launch-120503

https://www.seahorsemagazine.com/raceboats-search/ad/31-to-55,19/wilhelmina-nigel-irens-31ft-ldl-motor-launch-2017,1373
It isn't easy to arrange flat glass panels to match a curved profile.

https://www.sandemanyachtcompany.co.uk/yacht/615/WILHELMINA

Length waterline    30 ft 9 in / 9.38 m
Beam    8 ft 4 in / 2.55 m
Draft    1 ft 8 in / 0.5 m
Displacement    1.8 Tonnes
Construction    Yellow cedar epoxy strip-plank
Engine    25 hp 3 Cyl 25 hp Beta (2017)

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Wilhelmina-sailors-motor-launch-nigel-irens-design-aft-view.jpg





 
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Sail4beer

Usual suspect
10,030
3,417
Toms River,NJ


“To my eye the windscreen aesthetics couldbe tweaked a little.”

Hmmm, they spent a lot of time on that deck to windshield design. I personally think it might look better with a 3 piece curved glass arrangement. It

It’s cool to see an old school transom hung rudder and stepped deck sheer though!

 

socalrider

Super Anarchist
1,390
749
San Diego CA


“To my eye the windscreen aesthetics couldbe tweaked a little.”

Hmmm, they spent a lot of time on that deck to windshield design. I personally think it might look better with a 3 piece curved glass arrangement. It

It’s cool to see an old school transom hung rudder and stepped deck sheer though!
The transom hung rudder is surprising.  0.4lph at 11kts is impressive.  25hp Beta on a 31' powerboat!  Very cool.  

 

ProaSailor

dreaming my life away...
6,106
793
Oregon
 0.4lph at 11kts is impressive.
The figure I quoted is 0.4 Litres per mile, not per hour.  A "94 nautical mile passage [...] at an average speed of 11 knots" is 94 / 11 = 8.54 hours; 37 Litres / 8.54 hours = 4.33 liters per hour.

That's 1.14 gallons (US) per hour or 9.6 NM per gallon.

 
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kimbottles

Super Anarchist
8,055
783
PNW
Rumor has it that the original “sailor’s motorboat” is for sale.

George Griffith’s SARRISA the ULDB designed by Michael Peters.

I will try to get more details.

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socalrider

Super Anarchist
1,390
749
San Diego CA




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