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Footy Class R/C Yacht Green Hornet

by BillHagerup, published

Footy Class R/C Yacht Green Hornet by BillHagerup Oct 31, 2017
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Summary

You can print your own R/C racing yacht and have it on the water in a week.

Green Hornet is a Footy Class sailboat that can be used for fun in your swimming pool or as a highly competitive race boat for international competition. You can find information about the Footy Class at http://footy.rcsailing.net/

Print files are provided for the complete hull, fin, and rudder. You may need to resize the fin and rudder before printing. I recommend that the fin be 45mm wide and 200mm long. The rudder should be 35mm wide and 150mm long.

Complete instructions for assembling your Footy are at https://3dprintedradioyachts.com/ where you will also find much useful information on printing 3D boats from Footy size to IOM.

How I Designed This

I design my boats using FreeShip, an open source CAD program developed specifically for boat design. I export a completed boat to a .igs file that my friend Selwyn Holland prepares for printing using Simplify.

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Hi, im printing the green hornet, and I want to know how do you print the fin and the rudder, Hollow? Thanks

Yes, zotfidjy, they are printed hollow and made stiffer by inserting carbon rods down the hollow centers.

Hi Bill, just to make sure you don't miss it: I updated my make, finally I was able to maiden the boat! Great fun, and very impressive how well the hull and deck design works under pressure downwind! Great design, thank you!

Philipp

Hey Bill: The University of Houston Library, where I work, just purchased two 3D printers and they are working on little projects to demonstrate the capabilities. Makerspace environment being developed. I have thrown my hat into the ring to produce one of these so fingers crossed. This is definitely one of the bigger projects that they have been challenged with. If we are able to do this, I will keep everyone informed on progress and hopefully final build. Thanks so much for having this available to us to utilize.

Wishing everyone a great 2018 and as always......

Good Sailing ~~~~~~~ _/)
Mark Cooper
Houston, TX

Hi Bill, thank you for posting this, the Footy class looks crazy enough to give it a try!
Stupid question, am new to Footys: Your STL comes out at 319 mm length. In the rules, I am reading about max. 305 mm length. Should I scale the hull down to 305 mm? Or is there something off in my software?
Regards from Tokyo, Philipp

Phillip, it’s intended to be 319mm. The Footy rule is a “box rule” which allows the boat to be placed diagonally in the box. If you assemble it according to the instructions, the boat will fit in the box and be legal for competition.

Here we go, it fits!! (Not that I had the slightest doubt, nooo.. ;) ) just had a hard time wrapping my head around this box idea, and how it influences rig movement etc... I was actually considering to print the box with some leftover filament ;) but this experiment in CAD shows that the Green Hornet is a much easier fit than a Pool Shark...
Hull and appendages have printed nicely, so I quickly designed some printed parts for mast and keel box and rudder tube. Let's see if these are any good...

PoolShark is a double-diagonal hull. Chris designed it to maximize waterline length, so it fits diagonally in the box in both horizontal and vertical planes. It's a great boat, but I prefer to work with just the horizontal plane which allows me to use a more efficient rig than Chris was able to design to work with the PoolShark.

ah-HA! Thanks for the instant reply! Need to think inside of the box then... this happens when RG65 guys have a look at the Footy class...
starting the printer now :)
Philipp

nice boat.... i have printed all parts but i can't find the instructions. can u share the instructions plan?

Thanks, LordXIII....sources for sail plans are included in the assembly instructions.

Hello, very beautiful ship, i want to make one, but i don't have no idea of sail boats, were i can find sail plans??
Thanks for all

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