Hi everybody, this is my first one all made from scrutch using GRP for the hull and polyurethane epoxy for the vanes, periscopes, etc. She is 1.33m in length and 0.12m beam. For ballast I use a flexible tank with a water pump and a Mabuchi 550 with 2.3:1 gearbox for propulsion. All up weight is 4.5kg( 5kg submerged).









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