Building a realistic Harrier RC VTOL-aircraft

A dream come true by the brothers Andreas and Hans Siek

“Since more than 30 years our family is fascinated by airplanes as radio controlled models with realistic functions and scale like designs.
The first attempt of building a vertical take off and landing plane started at that time when pretty powerful gasoline driven Impeller-Fans were developed for Jet-Airplanes. It was soon clear for us that we wanted to build a scale like RC Harrier model using this new technology.
A complete fuselage, wings and a new ducting were developed to fulfill this problem. We had a 4.5 year trial and error phase because there simply was not enough power to weight ratio which is the most critical aspect to be solved.
Another critical aspect is the control of automatic leveling during hovering mode of such airplanes. The time went on and also the development of electrical powered motors and light weight batteries started. Today the development is on that stage that electrical powered units are far more efficient and powerful than gasoline driven motors.”

Andreas Siek

This is when we decided to give our dream a next try. Having sold unfortunately the old fuselage and parts we needed to start from the very beginning. We knew which motor and powering unit in terms of weight, size and thrust to be used for this project. An electrical powered Schübeler 130mm impeller fan (special order) would give us about 10-12 Kilos of thrust.
We then needed a scaled fuselage to fit perfect that power unit to make the plane as small as possible to save weight. Such a model cannot be bought in any shop around the world right now and is therefore a complete prototyping project.”

Andreas Siek