UMT-80 Specifications

Rotor

Diameter:                                 24.4 m (80 ft)

Blade Length:                           11.4 m (37.4 ft)

Number of Blades:                   2

Pitch:                                       Fixed

Airfoil:                                      NASA LS (1)

Orientation:                              Downwind

Material:                                  Wood/Epoxy Laminate

Constant Speed Operation

RPM:                                       60

Maximum Tip Speed:               76.7 m/s (173 mph)

Variable Speed Operation

RPM:                                       20-70

Maximum Tip Speed:               89.4 m/s (201 mph)

Performance

Cut-In Wind Speed:                 7 m/s (15 mph)

Cut-Out Wind Speed:              20 m/s (45 mph)

Nominal (Rated) Wind Speed:  18 m/s (40 mph)

Gearbox

Type:  Flender Planetary Gearbox

Ratio:  30:1

Generator

Rated power:  250 kW

Marathon Electric Induction Generator

3 Phase

Vectrol Soft Start

Power Electronics

Converter Output:  100kW continuous, 120 kW peak

Manufactured by Soft Switching Technologies

Grid-Side Power Factor:  1

Braking Systems

Industrial Clutch Mechanical Disk Brake

Spring Applied, Pneumatic Released

Electro-Magnetic Tip Flap Fail-Safe System

Yaw System

Free, Damped

Control System

PC-based

Allows for remote operation

Tower

Free Standing, Open Truss, Tilt Down/Tilt Up

Hub

Height:  24.4 m (80 ft)

3 degrees free teeter

Abex gas spring/hydraulic dampers allow an additional 4 degrees of teeter

Adjustable Delta-3 Hinge

Lightning Protection System

Nacelle-mounted lightning rod conducts energy to underground copper grid

Transient Protection in control house protects data acquisition and control systems