Geiger HDP 13.5
# Geiger HDP 13.5

The Geiger HDP 13.5 is a German electric motor for powering electric aircraft, designed and produced by Geiger Engineering of Seigendorf, Hirschaid, Oberfranken.

## Design and development

The HDP 13.5 is a brushless 58 volt design producing 13.5 kW (18 hp), with an outrunner coil. It has a 93% 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.

## Specifications (HDP 13.5)

Data from Tacke

### General characteristics

* Type: Brushless electric aircraft engine
* Length: 181 mm (7.1 in)
* Diameter: 215 mm (8.5 in)
* Dry weight: 4.70 kg (10.4 lb)

### Components

* Coil type: outrunner
* Cooling system: air
* Reduction gear: none

### Performance

* Power output: 13.5 kW (18 hp)
* Voltage: 58V nominal
* Power-to-weight ratio: 2.9 kW/kg
