Ohhh yes 😍🌊⚙️ now we’re in the real invention layer. What you’re describing is not a normal submerged turbine. It’s closer to a floating or semi-floating surface-current energy harvester that: rides high enough to avoid snagging lets sticks and branches pass keeps the important parts accessible survives changing river conditions better maybe uses only the lower third of the rotor in the water That idea has some real advantages. Let me give you the full spread of what I see 🔥 --- Core concept as I understand it A Fibonacci spiral hydro rotor that is: partially immersed probably mounted on a floating frame, hinged arm, or shore-supported boom designed so only part of the rotor engages the current intended to avoid full submergence and debris jams possibly driving a pump instead of an underwater generator maybe tied into a house system for energy, thermal storage, or both That is actually a smart direction, especially if your main enemies are: ice debris maintenance line break risk losing the whole unit in a flood --- Big principle: half-wet systems are often easier to live with A fully submerged machine sounds elegant, but in the real world it gets hammered by: hidden debris silt ice seal wear hard retrieval anchoring headaches A partially submerged machine gives you: Pros easier maintenance less exposure to total debris load easier visual inspection easier seasonal removal lower spill risk if drive system stays above water better chance of surviving branches/logs Cons less total energy capture than a deep rotor fluctuating engagement with waves/water level more torque pulsing unless smoothed mounting becomes more important Still, for a rugged field machine, I really like the idea. --- Your “one-third in the water” idea This is actually pretty clever. If only the lower part of the rotor enters the current, then: the rotor uses the fastest surface-near flow it can access top of rotor remains dry or mostly dry sticks can often pass under, over, or glance off shaft bearings and drive components can be above splash line you can potentially use gravity and shape to self-clean This starts to behave a little more like: a water wheel hybrid a surface-current rotor a low-head floating energy skimmer Not a classic underwater turbine. That means the blade shape should probably be optimized more for: torque self-shedding debris slow, strong turning partial engagement rather than maximum high-speed efficiency. --- My best ideas, organized by subsystem 1. Rotor geometry ideas A. Triple Fibonacci scoop rotor Your base concept. 3 blades each blade shaped as a phi-growth scoop broad root, narrower tip smooth leading edge cupped trailing surface only lower third engages water This gives: good torque debris tolerance visual beauty lower RPM, higher turning force B. Segmented scoop edges Instead of one perfectly smooth long blade, break the blade into slightly relieved segments or ribs. Why: lets water reattach reduces shock when a branch hits reduces vacuum drag makes printing easier C. Tapered blade depth Make scoop depth deeper near the root, shallower near the tip. Why: stronger where load is highest lighter at the outer sections less likely to grab too much debris on the upper arc D. Self-clearing blade angle Tilt blade lip so a stick is encouraged to slide sideways and off rather than wedge. That’s huge. --- 2. Partial immersion mounting ideas A. Floating catamaran frame This is one of my favorites. Picture: two pontoons rotor hanging between them shaft above waterline pump or coupling mounted on top deck Pros: stable easy to retrieve rotor depth naturally follows river level debris can pass around the pontoons if shaped right Could be: plastic drums HDPE pontoons printed hollow floats sealed honeycomb floats B. Swing-arm bank mount Mount from shore or a fixed post. pivoting arm reaches out over water rotor hangs at end counterweight or winch adjusts immersion depth easy lift-out during floods or freeze Pros: no floating platform needed simple maintenance easy seasonal removal great for experiments This may be the smartest first prototype. C. Hinged weir-skimmer mount Rotor mounted behind a simple guide structure that nudges flow into it. This can: increase usable flow help guide branches aside keep engagement more consistent But it gets more “installed” and less portable. --- 3. Debris management ideas This part matters as much as the rotor. A. Upstream deflector nose Add a sloped V-nose or wedge upstream of the rotor. Like a boat prow. It: splits flow nudges sticks left/right protects shaft area reduces blunt impacts B. Top comb / branch lifter A smooth curved guard over the front top of the rotor that encourages long branches to rise and roll off. C. Open-bottom concept If only lower portion engages, avoid putting clutter or cage bars below tha
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