AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials - Tangerang Selatan, Indonesia (23–24 October 2019)] PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials - Energy consumption comparison of static pitch propeller and variable pitch propeller using maximum thrust equation approach in small scale electric unmanned aerial vehicle