Jupp Wimmer, an enthusiastic adherent of experimental model aircraft building, originated the idea of Inter-Ex. His intention was to force modellers to research more deeply into aerodynamics and he was successful in this aim. Today he is called the "Father of Inter-Ex".

In order to fulfil his wishes, he founded an experimental contest where like minded people could meet and compete amongst themselves. The jury should be the participants; rating their curious models by standard of construction, flight quality and originality, or degree of lateral thinking. Jupp provided the "Querdenkerpokal", a challenge cup for the pilot/designer who applied most lateral thought. This trophy is returned each year to be awarded to a new winner.

Probably Jupp's most important reason for such an event, was to enable the exchange of information between pilots/designers. Because new ideas and information are presented and discussed at Inter-Ex, inspiration can be gained to really make these ideas fly.

The real aim of Inter-Ex is to promote experimentation in model flying and the development of unusual flying objects by swapping experiences, ideas, suggestions and details of construction methods. Competition judging criteria of Inter-Ex are good aerodynamic qualities and mechanical construction, technical realisation and smooth, harmonious flight. Model flying weight should not exceed 20 kg.

Even if a modeller has no real interest in experimental model flying, a visit to an Inter-Ex event will almost certainly prove inspirational, as the range if ideas and innovations increases year on year. Even "conventional" models seem to fly faster, higher or longer! Whilst there is a serious side to the event, the atmosphere is light hearted, convivial and, with a collection of like minded people, there is a lot of fun to be had.

Modellers who are not interested in competition should still consider attending. The atmosphere is very relaxing as no points are awarded and no one comes in last place! Fun flying is allowed (indeed even de rigeur) outside the main event times - often during hours of darkness.