Zryw 1 : an hydrofoil RC boat

prusaprinters

<p>The Zryw 1 was built in the Gdansk shipyards in 1965.</p><p>It is a passenger hydrofoil boat and to my knowledge only one prototype was built.</p><p>Max speed was 30 knots and she carried ca 70 passengers and had a crew of 4.</p><p>I liked the look (it looks very much like a plane !) and the hydrofoil was adding a few challenges of its own.</p><p>The scale is 1:50 so that the real life boat of 27.4 meters scales to 55 cm.</p><p>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 !</p><p>The hydrofoil part means that this time we need this thing too literally take off…</p><p>This means a faster motor and a much lighter boat.</p><p>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).</p><p>The prop needs to be a “speeder” not so much a “pusher” like for the tugboat.</p><p>So here is the RC/model shop list:</p><ul><li>a 2216 motor</li><li>a 30 A ESC&nbsp;</li><li>a MG90S servo</li><li>a propeller shaft from Raboesch (model 300-00 180mm/140 mm long 2mm shaft 6mm external tube diameter</li><li>a 20mm propeller from Raboesch 170-41</li><li>a spring coupler ca 25 mm long: I needed a 4mm (motor shaft) &nbsp;to 2mm (propeller shaft) adapter</li><li>a 750mAh 4S battery 60x31x21 mm and ca 65g</li><li>a XT30 to Tplug adapter (or a new ESC !)</li></ul><p>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 preferably at 0.2 or less (the curves will look nicer). The foils print mostly without support but should be printed at 0.1. &nbsp;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.</p><p>Please note that I have not yet printed the model (I need to order some white PLA…) If you try it and encounter some issues, let me know and I'll try to fix it. &nbsp;Enjoy !</p>