Skip to main content

The Corbie 5 IOM laser cut building forms!

According to many, the Corbie 5 IOM of Mirage Radio Yachts in Tasmania is currently one of the most competitive boat designs available to the home builder who wishes to build a wooden IOM. The other wood IOM design is the "Alternative" IOM from Brad Gibson Sails and Design in the UK. I've purchased the plans for the Alternative but haven't received them yet.

Since drawing up laser cut frames for the Laerke IOM, I've started looking toward building an IOM that might actually be competitive with a more modern design. It was suggested to me by Bob Wells, a Seattle IOM guy with loads of knowledge about IOM's, that I contact Jeff Byerley in Tasmania and Ian Dundas in Scotland about getting the plans for the Corbie 5 IOM. Those two have worked together to create the Corbie 5 and to make it available to home builders.

I contacted them, bought the plans, and got the plans and a well-written construction manual. They also agreed to send me the DXF file of the stations so that I could make laser cut forms and a building jig. Thanks Jeff and Ian!

Below are pictures of what I've come up with so far for the Corbie 5 forms and alignment jig:

Corbie 5 IOM laser cut forms and alignment jig

Corbie 5 IOM laser cut forms and alignment jig
Each station was brought in 1.8mm from the outer edge to allow for planking. Each station has a step on which to perfectly align the first sheer rail. There are openings with small rectangles over which you can run rubber bands (elastics) to hold planks in place.

The stations even have a small 2mm diameter hole to shoot a laser through for those who have access to a laser pointer to double-check alignment.

The jig perfectly places each station, and each station can only fit a very specific slot. There are two braces that help support both the stem and stern forms as they are quite fragile.

I'm not sure if I'll ever make a Corbie 5, but if I do I now have the plans and laser cut forms to do so!


I have made an agreement with Jeff and Ian that I will never share this laser cutting file for the Corbie 5 IOM. If interested in making a Corbie 5 IOM, please contact Jeff or Ian and ask about building one.

They are currently charging $115 AUD (approx. $87 USD as of Nov. 2018) for the plans and manual. The plans come with station forms that you can copy and glue to wood to make yourself. For an additional charge they also have a company in the UK that will laser cut just the outlines of the forms for you, but they don't include the step for the sheer plank or the building jig. You'll have to carefully align all 21 forms on a board yourself.

From the Mirage Radio Yachts website:

  • Plans are now available for the Corbie 5.
    • A "woodie" IOM for those who like to do their own thing.
    • A set of full size stations printed on two sheets of A4 paper are included in the kit along with a very extensive manual which includes building instructions and tips, a tuning section, and maintenance hints.
    • Also includes a list of suppliers.
    • This manual was as a result of the work of Ian Dundas in the UK who has been a great help in this project.
    • The cost of the kit is $115.00AUD.
    • Laser cut stations can be purchased from a company called SLEC in the UKat an additional cost. This does save a lot of work and is more precise when setting up the building platform.
    • Please contact Mirage Radio Yachts at or ph 61362655432 or 61401026216

The "laser cut stations" referenced above only cuts a basic station shape that you then have to carefully align on a board after making detailed lines. My version perfectly aligns the forms for you, and the step on the forms eliminates the need for extremely careful marking and aligning of the sheer rail.

If interested in getting the laser cut forms that I've made using Jeff's exact station outlines, then also contact Jeff or Ian and ask for the laser cut forms and building jig that I've made. They can decide what to do for you. As of Nov. 2018 they haven't decided what to do with my file. Perhaps at some point they might make it available through their selected laser cutting company in the UK, or perhaps they may make it available through National Balsa in the US, or maybe they'll just send you the file and let you cut your own or find your own laser cutting company?

My only request if you end up using my file is that you send pictures of your build that I can post here on my blog! Thanks! 

Good luck on your build!



Popular posts from this blog

IOM Sailboat Stand

I made an IOM boat stand! The plans are from David Jensen in Bellevue, WA, USA. I found the plans through someone else's blog here , and a model sailboat club from Australia here . It was pretty straightforward to build. My only contribution to the design is that I laser cut the cradle out of 1/8" Lite Ply. I made eight copies, and then epoxy laminated two sets of four each. Turned out really well. If you wish to laser cut your own set, here is my DWG file . You'll have to have your own laser cutter, or send the job to a laser cutting company like National Balsa . Here are the original plans , and here are the original plans for just the cradle . Thanks to David Jensen!! Note that in the picture below, my boat is not finished! Yikes. You can't see it in this image, but there's a small chuck of self-stick foam behind the bulb to protect the bulb. I'll eventually incorporate some Velcro or a strap of some sort to hold the bulb in place so

IOM Rig Box (IOM Sail Box) plans

So all the cool IOM kids seem to have nice wooden boxes to store their rigs in. This might be my next quick project then, so that I can pretend to be cool too. :-P The rig box images that I've seen online are mostly similar, and would work well, but David Jensen from Bellevue, WA, USA (The same guy who designed a fantastic IOM boat stand I posted about earlier) has a really nice design that he shared on RC Groups . Or if that link doesn't work, the go here and search for " IOM sail box " or " IOM rig box ". It holds three sets of rigs for the A, B, and C rigs. He also has a nifty way to attach his IOM boat stand, with a boat on it, to the rig box. His rig box has wheels attached, so once everything is loaded up he just wheels it to the launch spot. Very nice! There are other sources online. They show different variations of the same type of sail box. Here's a nice looking one . Here's a YouTube video of a really nice one . Wil

A Wooden "Alternative" IOM RC Sailboat

Being forced to stay home due to the Coronavirus quarantine has had a positive impact on my boat building. I still haven't been able to sail my newly completed Vickers V8 IOM, yet have just planked and glassed a wooden Alternative IOM . It only took me eight days. It usually takes a couple weeks. I haven't been motivated to blog about it, but I started planking on 5 April and finished planking last night. Today I sanded and have fiberglassed the outside. The Alternative by Brad Gibson was a challenge to plank due to its up-swept bow and flared sheer near the bow. It turned out okay, but as any builder will tell you, there are goofs all over. One that I only discovered after sanding is a lighter colored plank on the starboard side. It really showed up after fiberglassing as the epoxy brought it out... GAAAAH! How did that get there? The other goofs I'll let you find, but that one is pretty obvious. Here's how it looks so far: Here you can see that mu

IOM Alignment and Measuring Jig (UPDATED)

I need to start to consider how I'll mount the fin and bulb, and get it all straight, so I made a 3D modeled alignment jig: Ian Dundas in Scottland sent me pictures of his setup. I just bought a laser level too! He does amazing work and has been a great help in this project so far. There is also another jig featured on page 14 of the winter 2008 Canadian Radio Yacht Association (CRYA) newsletter that features one. It's by Lawire Neish. Read it here . I took both those designs and made my own version that features sliding cradles for the hull, a fixed waterline sight, proper depth to cradles for the bulb, etc... Most of the parts can be laser cut, and the two end pieces and the base can easily be cut on a tablesaw. It has fixed waterline sights that are 420mm above the top edges of the bulb sliders in the base. The fore and aft cradles can be slid up and down to adjust the waterline of the hull. You'll see that the overall interior length is 1003mm t