Beoordeling 6
Foto van een scholier
  • Spreekbeurt door een scholier
  • 4e klas aso | 346 woorden
  • 17 mei 2005
  • 31 keer beoordeeld
  • Cijfer 6
  • 31 keer beoordeeld

De Galaxy Chromebook maakt je (school)leven makkelijker!

Met de Galaxy Chromebook Go kun je de hele dag huiswerk maken, series bingen en online shoppen zonder dat 'ie leeg raakt. Ook kan deze laptop wel tegen een stootje. Dus geen paniek als jij je drinken omstoot, want deze laptop heeft een morsbestendig toetsenbord!

Ontdek de Chromebook!
I’m going to tell you a little bit more about an important invention, the helicopter. In the 16th century, Leonardo da Vinci and other great thinkers made a lot of drawings of a machine that we now know as the helicopter but they were missing two essentials: a true understanding of the nature of lift and a competent engine so they weren’t able to build the first helicopter. Because of new techniques and better understanding of engines, Paul Cornu lifted the first helicopter in the air for a few seconds in 1907. In 1924, Etienne Oehmichen, became the first to fly a helicopter a kilometer in a closed circuit in 1924. It was a historic flight taking 7 minutes and 40 seconds. Then, in 1936, the German helicopter wulf fw 61 became the first practical helicopter and vertical flight was not a dream anymore. Nowadays helicopters have a lot of functions. For example: People use Sea-Kings for rescue operations, policeman use police helicopters and they are also used for transporting wounded people to a hospital. Modern helicopters have a rotor. Because of that rotor, vertical flight is no problem. Nowadays rotors are very strong and the quality of rotors is very good whereas the primitive helicopters had a lot of accidents because rotors weren’t strong enough. A good invention needs a good pilot. After 30 hours of lesson you can handle a helicopter but if you want to be a very good pilot you need 200 hours of lesson. The tail of a helicopter is very necessary because otherwise there is no balance and the helicopter would crash. The capacity of a normal helicopter is 4 till 6 people but there are also bigger helicopters for transporting goods to other countries or when soldiers need to go somewhere, people use a big army-helicopter. Big helicopters have generally 2 rotars because of the weight of the goods or the many people inside the helicopter. The invention of the helicopter was very successful but it’s also a dangerous invention. When you don’t pay enough attention or when there’s a defect, an accident could happen.


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dank je wel

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