IN FRIBOURG IN SWITZERLAND FROM 7 TO 16 SEPTEMBER 2017
The 61st Gordon Bennett Cup will take place in Fribourg in Switzerland right in the centre of the European continent.
The 61st Gordon Bennett Cup will take place in Epagny, at the foot of the Château de Gruyères, right in the picture postcard setting of the foothills of the Alps.
This is an ideal launching site and just perfect for an event of this size during which the public can enjoy air sports and follow the world cup.
A gas balloon is an air balloon which ascends supported by the pressure of the air surrounding it.
To keep the balloon in place, Archimedes forces and the weight of the balloon must be balanced.
To get a gas balloon to ascend, ballast needs to be thrown overboard, either sacks of sand or water.
The balloon goes up if the hydrogen which it contains weighs less than the volume of air it displaces.
To come down some of the hydrogen must be allowed to escape using a valve situated at the top of the balloon. The volume of the balloon reduces, as a consequence the support from Archimedes forces falls and that causes the balloon to come down.
The pilot must be sufficiently skilled to anticipate the variations in the atmosphere which influence the performance of the balloon in good time (heating up, cooling down, humidity and thermal columns). The objective is to keep a constant height using as little ballast as possible.