Electrical Power0W
Rotor Speed0rpm
Tip-Speed Ratio0λ
Shaft Torque0Nm
Below cut-in
4.57 m tall × 3.88 m dia
GDR-1200 · EcoVoltz
11.84 m² swept · 1.30 kW rated · Homestead / single-household off-grid
11.84 m² swept · 1.30 kW rated · Homestead / single-household off-grid
Swarm
1
modular units
Open farmland, steady prevailing wind. The baseline deployment.
Wind speed · drag to drive the rotor
4.5m/s
GDR-WE v1.0Live wind engine · computed, not recorded
CSIR-grade, live
THE MATHEMATICSEvery figure below is computed live from the wind speed set on the Live Rotor stage. No decoration, all traceable to the design register.
Betz-family power law
P=
½
ρ
A
Cp
v³
→
0 W
ρ1.225 kg/m³air density (sea level)
A11.84 m²rotor swept area
Cp0.35power coefficient (calibrated)
v4.5 m/swind speed (live)
k2.54 = 0.4408·L²family coefficient, P = k v³
Power-law family curve · cut-in, rated and furl gates
Zero net lateral force · ten panel-thrust vectors cancelling
The golden-gnomon sail · 36-36-108 triangle
Balance decagon of nodes · R = (φ/2) L
Icosahedral topology
COUNT THEMTap a group to isolate it on the live rotor. The whole machine is 30 struts, 12 hubs and 10 sails, each at its exact mathematical position.
All curves and vectors are evaluated in the browser from the locked design parameters. The decagonal geometry gives a numerically verified residual lateral force of 1.1 × 10⁻¹⁶, which is why the GDR-1200 can stand on a cheap guyed mast where conventional turbines need a stiff tower.
The game · beat the diesel kWh
SITE CHALLENGEPick a real South African deployment scenario. Each carries a mean wind resource. Place the GDR-1200 and score it against diesel. Target: payback under three years.
South Africa wind zones · indicative planning bands
Tap a region to load its mean-wind band into the live engine. These are planning-grade regional indications, not site measurements, a real site needs a met mast. Best to worst for the GDR: coast and escarpment, then the open interior plateau, then sheltered valleys.
Or pick a deployment scenario
Result · Limpopo farm · 4.5 m/s mean
0kWh / yr
Annual energy
0R / kWh
Cost of energy
0years
Payback vs diesel
0t / yr
CO₂ displaced
Beats diesel
Payback under three years.
Best payback across sites is ranked below (saved on this device).
Leaderboard · lowest payback wins
Annual energy uses the published Rayleigh-distribution model at 85% availability; the three site anchors (4.0, 5.0 and 6.0 m/s) match the funding proposal exactly. Payback is measured against a diesel genset at R9.00 per delivered kWh.
The honest positioning
ECONOMICS LABCost per delivered kilowatt-hour. Midday solar wins the day. The GDR-1200 is engineered to win the night-time and diesel kWh, and says so.
Cost per delivered kWh (Rand)
Adjust the assumptions
Honest framing. The GDR-1200 bar tracks the site wind speed (R2.35/kWh at 5 m/s). The diesel bar tracks the diesel price. Solar PV daytime at R1.15 is deliberately left cheapest, because credibility beats an inflated comparison, the GDR competes with the diesel and battery-stored night kWh, not midday solar. Target unit cost at batch is about R37 000 ex-works against an imported-competitor price of R60 000 to R65 000 installed.
Firm-power hybrid system · the flagship offering
FIRM-POWER HYBRID24/7 farm power: the GDR turbine + storage + solar, sold as round-the-clock firm power, not a bare turbine. Solar owns the day, the GDR wins the night and winter, together they need a smaller battery and beat stored solar (R3.00-3.60) and diesel (about R9) on night kWh.
24-hour generation vs load
Solar (day dome)
GDR wind (around the clock)
Load
Battery bank needed
18.6kWhwith GDR
vs 24.0 kWh solar-only. Wind at night shrinks the store you must buy.
Saves R32,421 capex
Night / diesel kWh displaced
5.4kWh / day
Around-the-clock wind carries load when solar is asleep, straight off the diesel and battery-stored night kWh.
Blended cost of energy
R2.12/kWh
Hybrid vs R2.22/kWh solar-plus-battery alone. The GDR night kWh (R2.35) beats stored solar (R3.00-3.60).
Design the hybrid
Honest framing. This is complement, not competition: solar owns the day, the GDR wins the night and winter (escarpment winter wind matches cold-chain demand). Cost anchors: solar day R1.15, stored-solar night R3.00-3.60, GDR at 5 m/s R2.35, diesel about R9.00; battery capex about R6,000/kWh installed. All arithmetic is transparent and derived from the verified reference geometry.
Platform, not product
THE PROGRAMMEThe GDR-1200 (EcoVoltz) is the fully drawn TRL 3-4 reference we simulate with: design and IP complete, patent filed, no prototype built yet. The mission is a scalable wind-technology family and the programme that prototypes, validates and industrialises it.
Development pipeline
Done
01 Design & IP
Complete controlled drawing set and corrected mathematics; patent filed 9 May 2026 with Zenodo defensive publication. Top-10 selection Jan 2026.
Next
02 Prototype
Build and demonstrate the first physical GDR-1200 units on the fabrication cell, instrumented for logged performance and durability data.
Goal
03 CSIR Validate
Independent structural, fatigue and performance validation by the CSIR against the model, under MoU. The credibility spine.
Goal
04 Certify
Phased IEC 61400-2 small-wind certification path with professional-engineer review.
Goal
05 Fabricate
Local manufacture at over 85% local content via the AI laser-and-CNC cell. A rural workshop builds and repairs the machine.
The fabrication cell
The moat is not the drawing, it is the capability. An integrated laser-and-CNC cell (fiber laser cutter, fiber laser welder, CNC press brake with angle correction, CNC lathe and a 4-axis machining centre) holds the geometry, not a scarce master machinist.
A trained-but-not-expert rural operator produces repeatable, certification-grade, interchangeable parts. That is the difference between a clever prototype and a manufacturable rural product, and it is the core of the local-content and jobs story.
Why a platform, not a unit
One geometry scales by a single parameter, the strut length L. Rotor diameter is φ × L, swept area grows with the square of L and power follows P = k v³ with k = 0.4408 L², so the whole family, GDR-1200 through GDR-20000, derives from the same mathematics.
The GDR-1200 is the fully drawn reference. The larger four models are geometrically defined and scale exactly from the mathematics, clearly labelled as programme-roadmap, no invented test data.
Partnership and funding
Validate it with us
South Africa rarely funds a renewable-energy technology whose mathematics, controlled drawings and IP are already complete. The programme builds the first physical prototypes and takes them to independent CSIR validation and local industrialisation.
Programme grounding: canonical models record and KH-GDR-TIA-001. TRL 3-4 today (design and IP complete, patent filed 9 May 2026, no physical prototype yet); TRL 7 at exit (field-validated, certification path, manufacturing-ready). The GDR-1200 is fully drawn; the larger models are geometrically defined projections from the mathematics. The ten-panel geodesic concept originates with Young June Jeon (GeoWind, PCT/KR2023/019844); the corrected mathematics, drawing set and GDR designation are Kutlwano Holdings' independent contribution.
Assembly
BUILD MODEThe bare icosahedral frame is standing. Fit all ten golden-gnomon sails, five teal from the bottom node, five gold from the top, to complete the rotor and earn the spec sheet.
Sail bin
Tap a sail to fit it to the frame. Teal sails fan from the bottom node, gold sails from the top, alternating like a pinwheel.
0 / 10 sails fitted
Spec sheet earned
- Height 4.565 m
- Diameter 3.883 m (φ × L)
- Swept area 11.84 m²
- Struts / hubs / sails 30 / 12 / 10
- Total sail area 27.4 m²
- Generator 1 kW PM, 150 rpm
- Rated output 1.30 kW @ 8 m/s
- Cut-in / furl 2.5 / 15 m/s
Assembling deployment…
Deployment clusters
Cluster size
6
Sandton city
6.5 m/s · indicative rooftop wind
6
Units
1.30 kW
Per unit
7.80 kW
Combined
Modular by design. One unit down does not down the system; grow the array as demand grows. City rooftop wind is indicative (venturi acceleration between towers); the machine's omnidirectional, zero-lateral-force, no-yaw traits are the grounded advantage in turbulent city flow, and its low structural loading suits building mounting.
Guided tour
Let Lerato walk you through the platform, and choose where to go next at each step.