Interesting ballastless sailboat "Shearwater Yawl" design by Phil Bolger and Peter Duff

This is a "ballastless" (no permanent ballast, it uses water ballast and cruising cargo and gear as ballast) sailboat.

As mentioned bellow in the comments it seems a bigger version of Dovekie which is an amazing rowing-sailing boat with large following, and also probably is a homage design of tilikum, which was also a LDL low heel multimast sailboat, one of the first small cruising boats to sail around the world (causing controversy by the close minded and self interested sailors)

This type of Sailboat should be the norm for cruising instead today heavy sloop fin keelers as it has a stable hull and low heel due to short mast span and it's a 8.6m light sailboat (500kg), safe, beachable, and doesn't have helm deviation as current sloop sailboats by including bow pivot board besides sail area around all the length, and goes upwind like an arrow (probably the low freeboard and windage helps).




The hull of this boat is a hybrid with two transitions from stern to midship and midship to bow. it took me a lot to design it before i found the real hull lines plan and did a more realistic version, its even more challenging than clubswan36. It's also related to sharpies both first flat sharpies and late round sharpies

The Pivoting bow board, rudder and leeboards are a very good choice of appendages




SketchUpwarehouse link to watch or download 3d model

3D Warehouse https://3dwarehouse.sketchup.com/model/386c6164-254d-4fa3-bdcf-18ef1e621ef1/Interesting-ballastless-sailboat-Shearwater-Yawl-design-by-Phil-Bolger-and-Peter-Duff

Specs

https://sailboatdata.com/sailboat/shearwater-28-edey-duff/

 

Nice work on the model (just seeing the image, I do not have Sketchup) It is an interesting boat for sure.

Some would say the design is a scaling of Dovekie, by the same designer same builder.

Magic of Maine 1 https://www.shallowwatersailor.us/04-06/index.html

The line drawing that you enclosed shows a water ballast tank (bottom center).

There is also a comment in the same article above that no 2 Shearwaters are alike. The mast seems to be moved quite a bit aft on the one with the tanbark sails.

If you added the bowsprit to your model, would you keep it fractional or take the forestay to the masthead?

 

Yes, I just realised it has water ballast after checking the drawing now so I corrected the post and yes the mast in the picture is placed more close to midship while in the drawing is placed forward.

The design is just fine and it's one of the few boats I wouldn't change anything and it makes me healthy envy watching the pictures of Dovekie and your link, it seems is a rowing-sailing boat hybrid and had plenty of followings.

Maybe i would bow to the drawing near-cat mast however the good thing of having the jib on the bow is opening the hatch and having direct access i suppose

Sketchup can be downloaded for free in some pages and it's easy to learn in an afternoon with tutorials

 

It turns out I have a login for Sketchup so I was able to see the file in the Warehouse link.
A local boat broker had a Dovekie a few years ago so I got to see one up close.
A foresail and forward hatch would be nice.

 

Reminds me of Bolger's Black Skimmer. The attached drawings show a bottom profile with no aft rocker. Not what I would expect for a sailing boat.

 

The problem is that Google sold SketchUp to Trimble and from there went downhill.

Before that all plugins were created by sketchup users and free to download and there was a free version to download with almost the same features. So Trimble tried to monetise the software to sell to architecture studios and stopped developing and helping to standardise the software files while SketchUp warehouse is the major amateur design base and uploader of cad files along Grabcad

Now it seems that Trimble only allows a limited free web version and now it forces people to create an account to download and even view the file in 3D...so i think i will upload everything i have to grabcad with standard cad files

However in most of platforms the feedback is pretty poor and the distance between uploaders and downloaders, so it ends like a going shopping in front of a cashier and nobody contributes to the design or whatever. One of the places where there's some positive feedback is Thingiverse

 

What boat are you referring Shearwater Yawl or Black Skimmer?? Yes it seems aft rocker is meant to avoid broaching or improve the hull righting moment or stability curve, thats why centreboards have plenty of aft rocker i suppose and IOR 80s sailboats can sail with plenty of sail when wide aft beam and little aft rocker current sailboats need to reef

 

@messabout Is this the one?
Black Skimmer - Small Boats Magazine https://smallboatsmonthly.com/article/black-skimmer/


@Herreshock Yeah, the monetization thing is not fun when they start out promising the software for free. GrabCAD will require a login to download. The 3D viewer seems to work when not logged in.

Added a masthead foresail, hatch, waterline @ 150mm/6". The jib might be too much...

 

I believe Google originally bought Sketchup from Trimble when it was a new and relatively simple means of 3D creation. Google then threw it to the gutter when it no longer suited them (not that I'm bitter or anything but do kinda miss the good old days ;-)).

 

Wow the render looks good and makes the boat tease even more, the foresail gives more appeal too


The black skimmer looks like a flat sharpie and the bottom curve looks good, i have thought about making curved-flat sharpies just by bending or cutting wood with the same curve, so a plywood can be cut without any leftover and these curves can be used for the bottom and sides and even deck

That way the fast construction is the same and without mold and reducing wave slamming with the curves

I still have sketchup fredo free plugins by installing 2016-17 fredo library and plugins. I don't understand how nobody in github has created a similar open source software

 

Apparently in wiki says @Last Software was the company that created sketchup on 2000 and Google sold it to Trimble in 2012 and since 2017 went monetisation downhill

 

Sharpies, by definition, are flat bottom boats. Look at Bolger designs for maximum use of plywood. For example, his Glaucester Light Dory.

 

Most centreboarders have much less aft rocker than yachts, not "plenty of aft rocker".

No, aft rocker does NOT increase the hull righting moment.

 

Yes that is the Black Skimmer that I was referring to. Years ago I chartered one of those dandy little boats in the Bay of Florida. Some of the odd features that would put some of to wonder, were some of Bolger's down home wizardry. He drilled hundreds of holes in the fore and aft bottom. Brilliant idea as it turned out. I loved the boat. It was simple, easy to sail, and behaved perfectly in all sorts of weather. It was also quite capable of sailing in surprisingly skinny water like 12 inches of skinny water. One more thing.....In very heavy weather it was astoudingly fast. As an inshore camp cruiser it has much to recommend it.

Here's a salute to Old Phil.