Zryw 1 : an hydrofoil RC boat

12/16/22 update: I finished printing using vanilla white PLA from Prusa. I’m updating some files as I encountered some issues. 

I also refined the mooring parts by making cleats so that’s also in the update. 

I split hull3 into 2 parts to ease printing (hull 3a and hull 3b). In case you managed to print hull3 in one go, you need to use the original servo bracket. Now with hull 3ab you need servo bracket a ! I also made a stand so that you can display the ship or keep it horizontal while you are working on it.  I improved the motor bracket but the old version is comptatible and you do not need to reprint. I made the rear masts thicker so that they dont break too easily. I added 2 posts on the rail guard (stern side) to ease bridging. I also added a support on the cabin mast so that the V part was easier to position. I case you find the assembly pins too tight a fit I suggest you scale them down to 2.8mm in diameter in the slicer, the length does not really matter.

I've finish assembly of all printed parts except the propeller shaft support tube that is normally part of the rear foil.  I prefer to wait until I'm able to mount the propeller shaft.

Well, the rear foil assembly was rather easy once you put the parts in the right orientation.

To help the assembly of the 2 wings and the propeller support you can use some masking tape and position the parts on the edge of your desk so that part of the propeller support can descend below your desktop (see picture).

The assembly of the front foil was okeyish; in fact, I had to do some post processing as the parts were printed with supports but at the end, I did manage to glue everything together.

I may come back to improve the front foil but this was a 3D sketch brain teaser so it will not be easy.

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The Zryw 1 was built in the Gdansk shipyards in 1965.

It is a passenger hydrofoil boat and to my knowledge only one prototype was built.

Max speed was 30 knots and she carried ca 70 passengers and had a crew of 4.

I liked the look (it looks very much like a plane !) and the hydrofoil was adding a few challenges of its own.

The scale is 1:50 so that the real life boat of 27.4 meters scales to 55 cm.

If you compare it with my tugboat, the main difference is that the Zryw is much thinner so there is a lot less real estate for the RC stuff. On the plus side it's a one prop / one rudder design so there is less components to house !

The hydrofoil part means that this time we need this thing to literally take off…

This means a faster motor and a much lighter boat.

Now I tried to reuse most of my RC components but my 2S batteries at 250 g each were an overkill. Anyways if I wanted the speed to increase I needed to ramp up the voltage. My 2216 accepts up to a 4S battery which is 14.8 V as it is a 880 V it will max at 13000 rmp (no load).

The prop needs to be a “speeder” not so much a “pusher” like for the tugboat.

So here is the RC/model shop list:

• a 2216 motor
• a 30 A ESC 
• a MG90S servo
• a propeller shaft from Raboesch (model 300-00 180mm/140 mm long 2mm shaft 6mm external tube diameter
• a 20mm propeller from Raboesch 170-41
• a spring coupler ca 25 mm long: I needed a 4mm (motor shaft)  to 2mm (propeller shaft) adapter
• a 750mAh 4S battery 60x31x21 mm and ca 65g
• a XT30 to Tplug adapter (or a new ESC !)

As for the model itself, as weight should be reduced as much as possible the hull and the cabin are quite thin but they print without support. The foils print mostly without support but should be printed at 0.1.  The hull and the cabin assembly is eased by the pins that help position the parts. The 4th part of the cabin is simply glued. Foils assembly is pretty much straightforward and they glue in the little holes in the hull.

If you try the design and encounter some issues, let me know and I'll try to fix it.  Enjoy !