The Siemens SP260D is a German electric motor for powering electric aircraft, designed and produced by Siemens of Erlangen.^[1]

Design and development

The SP260D is a brushless design producing 261 kW (350 hp), with an inrunner coil. It has a 95% efficiency. The low working rpm of the engine means that it can turn a propeller at efficient speeds without the need for a reduction drive.^[1]

Specifications (SP260D)

Data from Tacke^[1]

General characteristics

• Type: Brushless electric aircraft engine
• Length: 300 mm (11.8 in)
• Diameter: 418 mm (16.5 in)
• Dry weight: 50 kg (110.2 lb)

Components

• Coil type: inrunner
• Cooling system: air
• Reduction gear: none

Performance

• Power output: 261 kW (350 hp)
• Voltage: V nominal
• Best efficiency: 95
• Power-to-weight ratio: 5.22 kW/kg