Seuraa 
Viestejä45973
Liittynyt3.9.2015

Mietin tässä että jos liitän heliumpalloon pienen raketin ja videokameran ja lähetän sen taivaisiin. Kun heliumpallo on niin korkealla kuin se voi päästä laitan raketit käyntiin. Kuinka iso raketin pitäisi olla jotta se pääsisi maanpainovoimalta karkuu ja avaruuteen?

Kommentit (8)

Raketin tarvitsee olla tarpeeksi suuri voittamaan painovoima ja ilmanvastus siinä korkeudessa missä se käynnistetään.

vierailija
Seuraa 
Viestejä214
Liittynyt19.4.2006

Alailmakehää kuvattaessa samalla systeemillä, onnistuisiko jos palloon laittaisi siiman kiinni ja kelaisi pallon alas. Korkealleko pallo siiman varassa voisi nousta?

Major_Breakthrough
Seuraa 
Viestejä12359
Liittynyt13.3.2017

Mikroaalto raketti; https://www.youtube.com/watch?v=q3jAdHBCgiU&t=80s

Externally powered thermal rockets differ from chemical rockets in that they directly heat a low molecular weight propellant such as hydrogen, and are thus limited only by the amount of heat that can be imparted to the working fluid. One way of providing heat to a thermal rocket is by wirelessly beaming it, as microwave energy, from the ground. This type of propulsion will offer a ten-fold improvement in payload fraction over existing chemical propulsion systems, and exciting progress is being made to turn this concept into a reality. In fact, the utility of electromagnetic power beaming isn't limited to space launch rockets. By developing safe, efficient power beaming systems, it is possible to deliver electricity to flying unmanned aircraft systems, enabling a new generation of sustainably powered flight. In an age where wireless communications are ubiquitous, and where electric cars are becoming commonplace on our roadways; it is not difficult to foresee a future in which wireless energy transfer will revolutionize the way we access the skies and beyond. Bio- Michael Kelzenberg is a Lead Research Engineer at Escape Dynamics Inc. He leads the UAV Power Systems group, which is developing novel rectenna technologies and power management systems for efficient, wirelessly powered aircraft. Michael received his Ph.D. in Electrical Engineering from Caltech in 2010, where he worked in the research group of Professor Harry Atwater. His graduate research focused on the development of high-performance silicon microwire photovoltaics, including their growth, fabrication, characteri-zation, and simulation. In 2010, he co-founded Caelux Corp. in Pasadena CA, to continue development of novel photovoltaic technologies. Michael's current research interests include renewable energy, solar cells, rectennas, wireless power beaming, and power management.

Our ignorance is not so vast as our failure to use what we know !
- M. King Hubbert

Tokilogi
Seuraa 
Viestejä670
Liittynyt15.5.2018

Ei busse ole keksiny mitään, on ollut vain toteuttamiskelvoton idea, mikä sekin oli "keksitty" jo 70 luvun alkupuolella.

Keksintö on kyseessä vasta sitten kun voidaan valmistaa toimiva laite, eikä niin että ollaan keksivinään jotakin, mitä on mahdotonta toteuttaa.

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