A Note on Glider Electric Propulsion

Abstract

This work presents the aerodynamic effects of installing a non-retractable electric regenerative propulsion system in a typical Standard Class glider. The propulsion system, including the weight for batteries and power available are estimated using a comparison with existing electric propelled gliders. The thrust available, the additional drag during free-wind milling, and the possible power extraction are estimated. This data is used to determine the performance of a glider during gliding flight, powered flight, and while regenerating electrical power. The conclusion is that a Standard Class glider with a 1.9 meter diameter two-bladed variable pitch propeller that is driven by an electrical 25 kW motor mounted in a fixed pylon, leads to a quite interesting, safe and reliable electric motor glider that is suitable for club and cross country flight training.