Hamel Monohull Paddle Boat

by swtchrwr, published

Hamel Monohull Paddle Boat by swtchrwr May 23, 2015

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107954Views 14054Downloads Found in Mechanical Toys


This is the 'Hamel Monohull', one of the example boats at this year's 'Moat Boat Paddle Battle' at Maker Fair Bay Area 2015.

Find out more at:


To keep the boat light, this boat was printed with infill at 5%.
I used PLA for this prototype and have note tried ABS.

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The file downloads do not match the pictured boat. The pins don't fit and the paddle is different. Is there some kind of mistake?

The hull floats, at least, but I'm really disappointed overall. I have to think that there has been some kind of mistake, because this was featured on the front page...

Really good design. Is this printed in multiple parts

Ogzgoiniquity Pollock oiiio

Comments deleted.

Featured design? Are you serious? Lol

Pegs are WAY to big.

Jun 6, 2017 - Modified Jun 6, 2017

About the paddle, one corner where two paddles meet at the hub are not filleted like the rest of the others around the hub.

made it, looks great! wish there was a peg that ran from the pins through the paddle to keep it positioned better

Thanks to "swtchrwr"
Made some of these boats to my Grandchildren. Will make great fun - For sure.
Reduced the size by 50%.
Good idea this one.

May 27, 2017 - Modified May 27, 2017

I printed the 3 pieces you put online, they do not get together, the boat propeller do not pass in the boat.
Are there any changes to be made?
Thank you

did you try scaling it down

I brought mine to a little stream with my kids for fun and experimentation. Going downstream it seemed to perform fine, we got better results when the rubber band was higher on the posts than lower. Going upstream, was interesting, even though it was a fairly swift current, this thing could actually beat the current, but it seems like it is front heavy, because it would take a nosedive.

This should be easy to extend to one of these toy boats that pull themselves along a string against the water current.
I always wanted one of these but the simple geometry and (necessary) big size for me made it feel a bit improper for 3D-printing.
So I didn't go beyond some rudimentary designs. So rudimentary that I haven't published them yet.

May 26, 2017 - Modified May 26, 2017

Suggestion: Can we make the peg and hole to be have a little taper say 2 to 3 deg? That will compensate for small size variation between the hole and the peg due to printing, and grantee a solid contact for the joint.

est ce qu'il est possible d'avoir les autres models que vous faites voir sur la photo?

peut-être, mais les autres bateaux sont probablement quelqu'un models a une course. c'est possible les modèles sont sur thingiverse.

Hy, can you upload the Katamaran?

"automatic translation"
Great, and remember, it's fun, I made small wooden boats on this principle when I was a kid.
Thank you for this nice realization

Excellent boat. Great project.

this is awsome<>amazing good job

What app did u use to design this?

Alibre Design 2012, now branded Geo Magic

Hello, the video is finished and we have put a link to your design! Thank you for your permission.


The pictures don't look like the model - the model doesn't have the holes for the pins. You said it was an "example boat", does that mean it is just the concept? This looks like a great bath toy! Would you be willing to upload a working model? Thanks!

The pictures do show a model that is slightly different than what was posted
The many holes in the hull of the pictured boat were an experiment to see what paddle size worked.
The final model removed all but 2 holes you need to 'fit' the included paddle. This model should work.

Ok, look at Cura documention, I will try to print it on raft for better initial adherence.

I can't print the paddle wheel with my Printrbot Plat. I scaled the project so it fits the printing area. It always starts the paddle wheel in the middle super fast and filament won't stick andwrap around the print head. Is there a way to tell the printer to start around the paddle wheel for stating its extruder initial pouring/clearing?

Add a brim?