Thaka.AiReviewed 16 October 2026 · schematic not to scale
Covers the orange drum, chain-drive, PVC-paddle bicycle wheel and scoop-wheel references. Visible rotation is evidence of motion; the photographs do not supply validated dimensions, loads or electrical output.
- 1Measured natural head / flow
- 2Wheel / runner and supported shaft
- 3Guarded transmission and matched generator
- 4Rated load and simultaneous V/A measurement
Site and operating requirements
- Survey net head, usable seasonal flow, flood level, debris and legal access. Select a design for that measured resource.
- Obtain complete shaft, bearing, mounting, guard and electrical drawings. A photograph is not a tolerance or load specification.
Tools and measuring equipment
- Tape/level and safe survey tools, timer and measured collection vessel for suitable small flows, tachometer and rated load/meter set; workshop tools follow the full drawings.
Output and operating conditions
For a head-driven design use P = ρgQHη with measured net head and flow. For a free-current wheel use the separate river-current calculator; do not count head and current twice.
Workshop planning route, not a cut list copied from a video. The TUM modular overshot-wheel paper provides a documented alternative; it is not the pictured bicycle design.Parts, quantities and dimensions
| Part | Quantity | Specification / dimensions |
|---|---|---|
| Survey kit and documented drawings | 1 set | Head/flow measurements, seasonal records, access survey, environmental permissions and full selected design drawings. |
| Engineered wheel and frame | site specific | Document wheel diameter/width, bucket count/shape, shaft material, bearing loads, anchoring and flood/debris load. |
| Guarded transmission and generator | matched set | Speed ratio = driving sprocket teeth / driven teeth. Obtain generator loaded voltage-current curve and maximum permitted rpm. |
| Protection and measurement | engineered set | Chain guard, accessible stop, rated enclosure, controller, dump load where required, load bank and meters. |
Preparation and component checks
- Read the complete linked method, mark its edition, and create a measured component list and a labelled sketch before starting. Keep experimental changes separate from the published procedure.
- Prepare the work area and inspect every component. Run the lowest-risk dry or unpowered check before water, heat, moving parts or crop material are introduced.
Procedure
- 1
Survey from safe banks. Record usable head, flow, low-season availability and flood limits before choosing a wheel family.
- 2
Choose a complete documented design with the workshop. Size the wheel, bearings, shaft, frame and anchoring from measured loads.
- 3
Match operating wheel speed to the generator curve. Calculate the sprocket ratio; verify shaft torque, chain rating and overspeed protection.
- 4
Fabricate and inspect in a dry workshop. Fit full chain and pinch-point guards; check alignment, fasteners, balance and free movement.
- 5
Have the specialist install from a safe work platform with the water isolated where possible. Keep electrical equipment above expected splash/flood levels.
- 6
Commission behind guards using the designer’s test loads and shutdown procedure. Log rpm, loaded V/A, flow and vibration at each test point.
- 7
Stop for debris, vibration, bearing heat or loose anchors. Plan inspection after every flood and a safe retrieval procedure.
Safety and inspection
Streams, chains and unsupported frames create drowning and entanglement hazards. Do not reproduce the exposed-chain or in-water hand adjustments shown in the references. Use professional access, isolation and guarding.
Verify the result
Electrical power = simultaneous loaded V × I for DC; log energy over time. A spinning unloaded motor or bright LED does not establish continuous household supply.
Measurement log
- Drawing revision, measured dimensions, resource inputs, speed/flow, loaded output, trial duration and every observed fault. Mark unknown values as unmeasured.
Maintenance and repeat checks
- Inspect and clean after each trial following the source method. Record wear, contamination, leaks or loose components; do not restart until the cause is corrected.
- Use the source’s service intervals and replacement limits. Recheck the result whenever a component, material, input condition or method changes.
Troubleshooting
- No output, abnormal heat, noise, vibration or leaks
- Stop and isolate first. Check the documented input, load compatibility, alignment and connections; keep guards fitted and refer specialist systems to their installer.