Sailors Powerboat

[Hitchhiker]

I do wonder how those IPS drives would fare in my home cruising grounds in Maine. They look like pot warp magnets to me.

Yeah, I don't think these are the drives you're looking for. 

 

[TPG]

I do wonder how those IPS drives would fare in my home cruising grounds in Maine. They look like pot warp magnets to me.

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.

 

[Presuming Ed]

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. 

 

[accnick]

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.

 

[maldonmud]

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

 

[fastyacht]

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

You mean tje plate rudder?

 

[maldonmud]

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)

 

[Zonker]

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.

 

[Cwinsor]

 

[Cwinsor]

^^^^ Abominations like this is why there can be no such thing as a sailor's powerboat

 

[socalrider]

 

[fastyacht]

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]

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]

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.

 

[Zonker]

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.

 

[MFH125]

But they don't.

They do.

The drag coefficients are different, but the total drag force is the same.

 

[LeCanard]

I quite like the Bertram Moppie 28. 

 

[patzefran]

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]

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. 

 

[slug zitski]

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. 

Nice boats, built like ships  

mega horsepower wave smashing machines  

https://www.safehavenmarine.com/home