What Others Have Been Saying

This is the “feedback” part of the site, snippets from emails and other forms of communication.


A Few Questions From Antoine

Dear Selwyn

You  made great with 3D  IOM boats !!!!! Its like a revolution… Tx to you!

I’m a French IOM mesurer and  my question is as such :

-Does the material of synthetic 3D printers is specified by the IOM rules ? (D2.1)

– how do you join the hull’s sections ?

-The quality of your hull’s surface does not look so good (asperities and bumps with 3D) how do you justify it’s efficiency?

-what’s the weight of the hull  with all reinforcement before electronics ?

Antoine FRA

Dear Antoine,

Yes, we have been surprised and proud of what has been learnt and how this 3d printing technology can revolutionise our beautiful sport. 
Thanks for your encouragement.
To answer your questions:
1. D2.1 allows thermoplastics for the hull and support structures and that is the basis of the 3d printing. We generally use the most common thermoplastic called PLA.
2. On the site the published articles at the bottom of the home page describes all this and there is more in the next article being published right now with Model Yachting (USA)…. and will appear on the site in due course. In summary, there are many ways to do this from bulkheads to special joiners and short support sleeves. Epoxy and most superglues grip the PLA tightly if sanded first.
3. In the early stages when we were learning the process, the surfaces were a bit rough. We would then sand them and gloss them as part of the process to get a prototype into the water. Then as we tested more and more, the surfaces became very smooth. At one point I decided to sail the prototype with the surface raw and this surprisingly went easily as well as the glossed surface… so we went through more testing with that and decided that the surfaces we produce now are best left alone because they seem to be superior to paint in terms of scuffing, cracking and chipping etc. Also, keeps the weight and preparation time down. Most good quality amateur machines will give an excellent finish also if done properly. Attached is the latest hulls I’ve produced here with silky smooth hulls… a USOM and a Nano (a new 3d printed dedicated class created by the IRSA for those interested in 3d printing)
US One Meter and a Nano
4. The IOM hull when prepared normally with all the racing gear and rigs attached can carry up to 250g of corrector lead in the hull to bring it up to 4000g. This is with a nice and resilient hull being printed. Lighter hulls can require more lead but what is the point, we would rather produce hulls that can survive the rough and tumble of racing… especially B and C rig conditions.
Hope this all helps Antione.
All the best.


The Number of Successes for 3D Printed Yachts is Rising Rapidly

Hello Selwyn,

First of all a huge THANK YOU for the inspiration your site provides. Especially the spiral vase method was the key for me to achieve usable hulls. I printed Andreas Hoffmann’s manta2017 RG65 design and was very surprised to find myself on 3rd place of 15 in the Southern German RG65 ranking event on August 6th.

My findings are the same as yours – the inherent roughness of the hull printed in 0.2 mm layers does not slow the boat down at all. I use the hulls as they come off the printer. Even the designer Andy Hoffmann himself (he came second) was very impressed after sailing my boat for a couple minutes.



The Word Is Getting Around
I scratch built a plywood footy and Bill’s Half Pint II and designed a couple more footys in 3DBoatDesign about six years ago.  But it was so much effort to build round bottom boats that I never built these designs.  I had been looking at 3D printing for several years too. Then I found your site on 3Dprinting boats. This was the incentive I needed to buy a printer.  I got a large volume 300x300x400 mm (Creality CR-10) printer for only $400.  I can hardly believe how accurate and smooth and light the prints are.  Now I can make a boat design in Delftship Free, slice it on end in spiral “vase” mode, and in two hours is printed a perfect full size footy hull.  What fantastic instant gratification.  Now I can hold the full size model hull and decide if a design looks right and if desired change it and print another.  It is hard to imagine building a perfect hull in just two hours. I haven’t figured out the details on keel, bulb, equipment, and mast support and attachments yet and I would appreciate any more details you are willing to provide. Thank you so much for sharing your technology and providing inspiration.  These techniques certainly ought to help popularize RC sailing since building is so much easier.  Now if I could only find other Footys to sail against.


Just Like The Internet

Wow! I’ve seen Selwyn’s  3D boats sailing/racing and I’ve gotta say this is like when the internet first hit 27 years ago:

  1. Initially everyone was sceptical
  2. Everyone “bagged it”
  3. It then proved itself to be a “game changer
  4. Everyone wanted it
  5. It becomes mainstream and everyone accepts it as “the normal” from where the next breakthrough comes from




From the web site: “3D printed boats”

(Snippets from the RCsailing.net forum)

For the past year or so, I’ve been collaborating with my Australian friend, Selwyn Holland, in what we think is a project that represents the future of Open Class development.

That may sound like hyperbole, but we have been able to combine my design work and Selwyn’s engineering to produce 3D-printed boats. I realize that a number of you have printed fittings successfully, and some have experimented with hulls, but Selwyn’s extensive experimentation and testing have made 3D printing a viable alternative to any other construction method…and a better one than most.

Here is a picture of one of our RG65 prototypes on the water:

Click image for larger version Name: IMG_2973.jpg Views: 22 Size: 942.4 KB ID: 16135

If that intrigues you, check out his new website here: https://3dprintedradioyachts.com

Still having fun with toy boats……….Bill

(Bill is a long term designer and advocate of all things RC Yachts from the US)

Hi Bill,
Yes I’m intrigued and skeptic at the same time, but always curious !
Most intriguing me are the weight, strength and costs once applied to a larger boat like a class M.
Ageing effects ?
I shall read the content of the link…


I understand the skepticism…but this really works. The largest boat we have on the water is an IOM…but Selwyn will be doing a 10R when time permits. A couple of test hulls were printed. Eventually, I think we will do all of the International classes.

The weight and strength are no problem…comparable to carbon hulls. We waited to go public with this until we (mostly Selwyn) worked out the kinks and until we had boats that proved they could win races. Once the initial investment is made in the technology, printing a hull is dirt cheap. Of course, this is too new to know about the effects of aging.

Since you already have the CAD skills, you just need to find a friend (like I did) who has a good printer. Even working across the globe, Selwyn can ask me for a change, I can do it and send it via email, and he can have it printing the next day. The slowest part of our turnaround time is when he has to send me stuff through snail mail.
I just Googled about UV resistance…turns out PLA is highly resistant to UV radiation.



Printing my own RG


      This is excellent. I’m in the process of hopefully printing out an RG of my own. Reading through your site, I’ve gained some helpful insights and look further to your further posts. There are a couple things I’d like to talk to you about. I won’t be there on Saturday as I’ll be up at Lake Macquarie for IOM#2. But looking to catch up with you sometime.


(Secretary of the Wollongong Model Yacht Club, Australia)


Nice site

Hi Selwyn,

Nice site & great that you’ve received so many visits.

Lookin’ good there, son. 🙂

Regards, Laurie..

(Long term RC sailor, Australia)


No Strings Attached

Hi Selwyn

Just had a look at the website after your enthusiasm  for the future of 3D printing in RC yachting this afternoon.

You should be proud of your achievements and ground breaking methodology which you are quite happy to share with no strings attached!

I tip my hat to you well done and keep up the great work!


(long term big boat sailor and now RC. 25 years as Club Captain at the Port Kembla Sailing Club, NSW, AUS)


Not A Single Drop Of Water…

Well Selwyn, I have more good news!

 I was admiring one of the hulls yesterday, thinking I actually prefer the finish from the printer, without the epoxy coat.  And with your awesome printing skills, it looked really tight.  So I put a pound of lead in it, taped up the ends, and floated it in the laundry tub…oops, I mean the test tank.  Left it there for 12 hours.  Opened it up this morning and there is not a single drop of water in it…not one drop!

 Awesome job, my friend………..thanks.