There is a guy with a Mini KEPs racing at my club, and built light it is competitive in the Mini Hydro class, especially so in the rough. He scaled it down from the T2 plans before the mini plan was released, so there may be some small differences to the plan, but the size and shape are very similar. It looks like the materials were different though as he used carved balsa for the sponsons and laminated balsa-1/64 ply for the tub to keep the weight down. I think he got his in at 480g, surprisingly close to the 465g of my molded kevlar boat. <500g RTR is a good weight for a Mini Hydro, the minimum is 450g but I don't think that is achievable while using the full 450mm allowed hull length. My old Zippkits JAE mini was an overbuilt pig that came in at 620g, and while I have had some success with it, it isn't competitive with good modern hulls built with the supplied materials, though the plan can still be if built light.
Paul Upton-Taylor, Greased Weasel Racing.
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