Sailors Powerboat

Presuming Ed

Super Anarchist
11,050
219
London, UK
OK, so vapourware at the moment, but still. I like it. 5 hours endurance foiling, electric power. From Spirit Yachts, boatbuilders by appointment to MI6. 

image.png

 

accnick

Super Anarchist
3,527
2,523
Make sure you have your open water certification and a drysuit handy. You'll be busy.

And those Sharrow props, boattest is a well known paid "reviewer". The numbers are completely made up bullshit.
What I have right now makes a lot more sense for where we are in Maine.

prop1.jpg

prop2.jpg

 

maldonmud

New member
45
10
Based on those photos only,  love the prop and the hull lines but why go steampunk at the arse/ass?

 
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maldonmud

New member
45
10
Guess so. Even more off subject, but hey ho!, steampunk plate or faired rudder? Good old Brunel 1845.

Back to the subject and far smaller at 18ft similar length to the dinghy's' and cats I have owned. I like the lines of a good old 1960's US built power cuddy Dorsett Catalina design. Conflict of interest - I have one similar in the UK (not as nice as this though)

1200px-great_britain_propeller_and_rudder_wideshot.jpg

130608-2512DorsettCatalina59Escapade.jpg

1959 catalina.jpg

 
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Zonker

Super Anarchist
10,155
6,349
Canada
I had a big argument discussion with a fast ferry builder in Australia who wanted to build plate rudders like you show. Finally convinced him to cover his plate with foam/glass to make me an airfoil. It was a bit fat but not as draggy as hauling a vertical cylinder through the water.

 

fastyacht

Super Anarchist
12,928
2,600
Guess so. Even more off subject, but hey ho!, steampunk plate or faired rudder? Good old Brunel 1845.

Back to the subject and far smaller at 18ft similar length to the dinghy's' and cats I have owned. I like the lines of a good old 1960's US built power cuddy Dorsett Catalina design. Conflict of interest - I have one similar in the UK (not as nice as this though)

View attachment 483146

View attachment 483150

View attachment 483153
That has 56 Chevrolet Nomad written all over it

 

fastyacht

Super Anarchist
12,928
2,600
I had a big argument discussion with a fast ferry builder in Australia who wanted to build plate rudders like you show. Finally convinced him to cover his plate with foam/glass to make me an airfoil. It was a bit fat but not as draggy as hauling a vertical cylinder through the water.
Damn. I just have to know which one!

 

MFH125

Member
164
166
Finally convinced him to cover his plate with foam/glass to make me an airfoil. It was a bit fat but not as draggy as hauling a vertical cylinder through the water
It's hard to convince people.  Humans have bad intuitions about drag.  No matter how many times I look at this picture, the fact that these two profiles have the same drag feels wrong to me.  Probably the very different volumes tricking my eye.

Screenshot_20220104_081738.png

 

Zonker

Super Anarchist
10,155
6,349
Canada
Damn. I just have to know which one!
Marine Engineering Consultants, Coomera QLD. Otherwise super nice guys and very good build quality.  Just read they went into liquidation late in 2020.

That latter diagram was on a blackboard in an aero course I took and it sure stuck with me. Biplanes with wires = super draggy.

 

patzefran

Member
141
30
France
It's hard to convince people.  Humans have bad intuitions about drag.  No matter how many times I look at this picture, the fact that these two profiles have the same drag feels wrong to me.  Probably the very different volumes tricking my eye.

View attachment 483253
CD is related to a reference area, Drag is proportional to S x CD ! Likely the reference area are not the same

 

Presuming Ed

Super Anarchist
11,050
219
London, UK
The classic British powerboat for sailors who have hung up their oilskins. Dale Nelson. Basically a pilot boat semi-planing hull. Narrow, so limited interior volume. Good seakeeping. 

Nelson-38-265.jpg


39-Victory-Return-from-Jersey-for-Winter-Servicing-1.jpg


 




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