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Model guide

Turbine Models

Turbines that do the same job behave very differently. A geared Vestas and a gearless Enercon do not share a maintenance calendar, a fault list, or an assembly timeline. These pages compare the models I have worked on by their specifications and by how they actually behave on site.

Each model page carries a comparison table against its sibling model, full specifications, model-specific systems, assembly stages, a maintenance schedule, and the faults I see most on that machine. For how the systems work in general, see turbine systems.

By manufacturer

VestasVestas SeriesV110, V126 and V136. Geared, DFIG generators, advanced pitch control. The parallel-axis versus planetary gearbox difference. EnerconEnercon SeriesE70, E82 and E92. Gearless direct-drive, annular generator, storm control. No gearbox failures by design. NordexNordex N117 DeltaA 15-stop tour of a 3 MW turbine from the tower door to the blade tip. What you see and what goes wrong at each stop. NordexNordex N902.5 MW class, common across Türkiye. Interactive 3D model of the seven assembly stages.

Frequently asked

Is a gearless (direct-drive) turbine better?

For maintenance, yes: with no gearbox there is no gear wear, no oil change and no reduction-stage failure. In exchange the annular generator is very heavy, which makes transport and erection harder and raises the initial cost, and generator thermal management becomes the main thing you watch.

How long does it take to erect a wind turbine?

It depends heavily on site conditions and the crane plan. The taller the tower and the longer the blade, the longer it takes: roughly 12–14 days for a lighter gearless machine, 16–18 days for a 3 MW geared model, and above 20 days for large-rotor 4 MW machines. Days lost waiting out the wind limit are on top of that.