Whaleback, a sharpie/sailing canoe

[skyl4rk]

I am building a self-designed sharpie/sailing canoe which is similar to the Paradox concept. The project is just past the rollover stage.

http://cruisenews.net/whaleback/

[ernie]

Call it my PKB bias but it kind of looks like a skinny micro with bilge keels.

then again I learned about sharpies from a Bolger book, so anything with a flat bottom looks PBish to me.

Being a skinny displacement hull it should handle an electric drive well (if you where so inclined)

What is the bottom paint? Looks like copper cladding from the way old school.

[skyl4rk]

The bottom paint is VC17M, which has copper powder in it.

The hull shape was based on Munroe's Egret, Paradox and a few old sailing canoe hulls. It is pretty much a sharpie with chine runners, much like Paradox.

[troy2000]

Bump....holy thread resurrection, Batman!

Does anyone know whether this project was ever finished?

[hoytedow]

Or why?

[troy2000]

Or why?

I clicked on his link and read his design parameters. Apparently he wanted something small but enclosed for cold weather on the Great Lakes, and was planning a small cabin that would give sitting headroom.

I quote, "The Great Lakes are cold for most of the year. The boat must provide shelter and insulation from the chill of the Lakes. Sitting outside in an open cockpit overnight is risking hypothermia, except for a few weeks of the year. The boat is intended to be a small boat, and the solution for this problem is to design the boat so that all lines, steering and ground tackle can be controlled from inside the boat or within reach when standing in a hatchway. The boat has a low profile to reduce windage and promote good close-hauled performance. There is sitting room only inside the cabin, the berth is too low (about 30 inches) to sit up in. There is no traditional cockpit in this design, the position of the pilot while sailing is sitting in the cabin."

I'm not sure what he had in mind for seeing where he was going....

[PAR]

I'm not sure why anyone would want to employ runners, but the hull needs a great deal of "belly" or depth to work effectively (relatively). This hull doesn't appear to have sufficient belly. You can't possibly expect good closed hauled preformance with runners, regardless of rig type used.

This thread is a long dead, recently revived thing. I wonder how it worked out, though I can guess at her preformance.

[troy2000]

I'm not sure why anyone would want to employ runners, but the hull needs a great deal of "belly" or depth to work effectively (relatively). This hull doesn't appear to have sufficient belly. You can't possibly expect good closed hauled preformance with runners, regardless of rig type used.

This thread is a long dead, recently revived thing. I wonder how it worked out, though I can guess at her preformance.

The whole thing looks top-heavy to me, even without the planned cabin.

I'm the one who resurrected the thread, out of idle curiosity. But the builder's web page hasn't been updated either, so he probably petered out and never finished the build.

[PAR]

I suspect he finished the build, tried it out and realized he wasn't as brilliant as Bolger and the runners didn't do dick for windward ability, let alone leeway. I've played with them a little and those wouldn't hold a craft up into anything. I'm not sure how much displacement he's planning on, but arranging hull volume for optimum result, must have been a class he skipped. With that stern as tall as it is, it should march around an anchor or mooring line in an annoying fashion too. But then again, what do we know.

[ernie]

If PKD sails to Cuba on a boat designed by PKB does he have to believe in reality to find Hemingway?

[PAR]

No, not all all Ernie . . .

[skyl4rk]

http://www.cruisenews.net/forum/viewtopic.php?f=67&t=3498

[troy2000]

In spite of my doubts about the design, I'm genuinely glad to see you haven't given up on your project.

Looks like you're making some headway again. Do you still think you'll be able to get her into the water this spring?

[Wavewacker]

From the depths of the forums: Hmmmmm, did this ever get wet? Hoping the owner is still around, with a report. I have never seen so many pictures of one boat being built. Looks like it could be light on top, didn't see any insulation except on the deck, I thought the Great Lakes were a little chilly.

[PAR]

http://cruisenews.net/whaleback/20110724/10.jpg

I have no word on a splashing or it's abilities underway.

[PAR]

http://cruisenews.net/whaleback/20110724/10.jpg

I have no word on a splashing or it's abilities underway.
Can someone resize this image for me?

[LP]

Ummm. . . . OK, Paul.


Did we loose computer privileges again? :P

[PAR]

Yea, I've been intentionally bad in hopes of a good spanking . . .

I wonder how accurate that waterline is . . .

[Wavewacker]

Yes, it appears a little odd as to the water line, but looks good, industrial, I like the ports. Reading the build, it seems the cabin is not water tight due to hatches, in the great lakes I'd want it tight due to that chilly water, I don't have a dry suit.

But I wonder if it has gotten wet????

[PAR]

His last post on the Cruising forum was back in April, so maybe it's been launched, found to be wanting and is back in the shop for "up grades" .

[LP]

I think that Matt Leyton's theory on the use of lifting bodies in sailing craft is an interesting use of the concept. I would think though, that the chine runners aren't very efficient as they have extremely low A/R. I wonder about local flow allignment, too.

I think that the bottom paint is not representative of the waterline. I believe there is a construction joint at that location for upper and lower side panels. The upper panel being attached inside of the lower panel.

[Wavewacker]

LP, that makes sence as to the paint job, it's a copper mix of some kind....

Matt L. had success with his runners on Paradox and reported that it worked well. It might be difficult to obtain the same results with the width and angle of the runners being duplicated just right. On such a small boat, isn't it harder to measure such results or realize the significance?

[LP]

Wave,

Who's to say, except though advanced hydrodynamics or lots of trial and error.

I am intrigued by the cruising style that is represented in Paradox and Matt's other craft. Here is a link to one of his craft that has seen extensive cruising.

http://www.microcruising.com/lc1.htm

[Wavewacker]

I have been toying with trying to build the Pardox as I have been on Matt's site for a couple years....just haven't been in one place long enough to consider anything. As everyone knows, I'm wanting something much bigger for the loop, but ya know, maybe a little bigger Paradox, longer cabin (more like Matt has) so more fuel could be carried might make a mico-motorsailor.

Actually, at about 18 feet, I think I could make that work for the Loop, after all, if Paradox can make 5 trips along the east coast to the Bahamas, it has been tested, but it's these old bones I'm thinking of....

Ya think it would plane on those runners if they were a couple (+) inches wider? I'd name it "Wavewacker"!