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BalloonWiki is a project of Ballaeron e.V.

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Blog

Sunny Swift

Sunny Swift Sunny Swift

Sunny Swift is a 32-year-old flight instructor and she is the hero of a flight safety comic strip from the EASA. There is a new story every month.

introducing poster of Sunny Swift

2018/02/14 15:50 · Volker Löschhorn

Wind Force to the balloon

Windkräfte am Ballon - Les forces du vent sur l'enveloppe

The amount of the wind force to the balloon depends on the wind speed, and the air drag of the balloon. And the air drag depends on the drag coefficient Cd and the cross-section area. The cross-section area of a balloon is nearly constant, but the drag coefficient changes due of the form of the balloon.

Credits: Pavel Hora

Calculated for a balloon with a volume of 3000m³

Windspeed (m/s) round balloon cw=0.4 Force (kg) dented balloon cw=1.6 Force (kg)
1 7
2 28
3 63
4 112
5 175
6 252 1008
7 343 1372
8 1782
9 2268
10 2800
15 6300
20 11200
25 17500

If the windspeed doubled from 5 to 10 m/s, the force to the balloon raised 16x.

Flight Practice

The conclusion for the filling of the balloon is, that to raise the balloon, a very temperature difference between the air in the envelope and the ambient temperature is needed. Dependend on the weight and the volume of the envelope, about 10°C to 20°C. At this low temperature there is nearly no pressure in the envelope. So the wind can easily dent the balloon. To avoid this, the air in the envelope should be heated up fast. But to do so, you need weight in the basket. For this the passengers should be ready to enter quickly the basket after the get the order for it.

2018/02/01 17:36 · Volker Löschhorn

International Cloud Atlas

The International Cloud Atlas from the WMO (World Meteorological Organization) - Manual on Observation of Clouds and Other Meteors: International Cloud Atlas

Internationaler Wolkenatlas

2017/04/10 07:12 · Volker Löschhorn

IATE InterActive Terminology for Europe

IATE stands for InterActive Terminology for Europe. It’s the shared terminology database of the institutions of the European Union. Its main aim is to facilitate the task of the translators working for the EU, but will hopefully also be useful for other EU staff and for the public in general.

http://iate.europa.eu

IATE IATE

2017/04/02 02:04 · Volker Löschhorn

Safety

Wake vortex

Wirbelschleppen

A safety video of the german Bundesstelle für Flugunfalluntersuchung about an accident caused by wake vortex: Video of an investigation into an accident caused by wake vortex

2016/11/24 14:14 · Volker Löschhorn
start.txt · Last modified: 2019/05/25 08:14 by Volker Löschhorn