(Very) original hot air balloon photos

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Capt_Maloche
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by Capt_Maloche » 13/09/07, 14:21

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by Christophe » 13/09/07, 14:34

Ah well here it is now clear:

At an altitude of 10000 m, if the temperature differential remains constant, a volume 3 times greater is required to maintain the same lifting capacity!
But the measurements carried out by R.Rochte in the United States in June 2003 show that the temperature differential between the interior and the exterior increases with altitude. This still results in a decrease in thrust: it went from 85 gr / m3 on the ground to around 50-55gr / m3 at 15000m altitude.
Due to the scarcity of air, the lifting capacity decreases with altitude.


The search for high altitude is therefore linked in the records, as you said, to strong winds ...

So to summarize: the thrust is stronger at low altitude but the displacement less important due to the winds of altitude. So the average consumption compared to the km traveled is lower at high than at low altitude despite a higher volume and losses ... above.

I good? : Mrgreen:
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by Capt_Maloche » 13/09/07, 15:20

That's it !

well, now you make us a solar for example 8)
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bolton069
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Re: Photos of (very) original hot air balloons




by bolton069 » 13/09/07, 17:10

Flytox wrote:Bonjour à tous

Question energy "disaster", do not forget the rockets in their acceleration phase .... tens of tons of kerosene + oxygen burned in 2 or 3 minutes for barely a few hundred km traveled and a final useful weight of a few% of the original mass ..... A beautiful orgy of wasted energy. : Mrgreen:

Fortunately, the astronomical price limits drifts (except military satellites and paid space tourism projects)

A+


In addition for a rocket, the energy cost of the design, studies, ... is equivalent to more than 8000 x : Shock: the energy cost of the trip. (heard at a Friends of the Earth conference.) : Evil:
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by Christophe » 13/09/07, 17:44

The info is interesting (it is valid for all air transport in particular: taking into account the 75000 employees of Roissy in the share of air transport pollution the figures would be very different) but I find a little limit on the part of an ecological association to attack rockets ... not only is it negligible for humanity but especially when we see the services that satellites provide to humanity ...

I bet that by taking the mileage gains made possible by GPS satellites, putting them into orbit, ecologically speaking, is already profitable ... for military applications it is obviously something else ...
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by Flytox » 13/09/07, 18:30

Bonjour à tous

No problem with most of the satellites which are completely irreplaceable weather, GPS, telecom etc ...

But what can become "toxic" is space tourism. : Evil:

http://www.linternaute.com/actualite/vo ... pace.shtml

Or how to carry your meat well above planes for a few minutes for a fortune spent on fuel. : Mrgreen: The principle that as long as you are rich enough to pay for any "bullshit" you can do it certainly has a limit.

There have been excellent articles in Sciences et Vie on these projects of gear intended for tourism.

A+
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by Flytox » 13/09/07, 19:26

Bonjour à tous

The storm in the hot air balloon with steam .... : Shock:

http://perso.orange.fr/ballonsolaire/historique5.htm

Can we make a comparison with the Pantome when we restore the energy of the vapor in the engine? : Mrgreen:

A+
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by Christophe » 13/09/07, 19:38

For space tourism it is obviously obvious ... the question does not even deserve debate given the prices ... for the moment hoping that they will never be (well until we have solved the problem of the greenhouse effect and fossil fuels) accessible to the general public ...

Quite a blow from the storm bubble, I never thought that this subject was going to be so economically interesting !! 8)

Another advantage of Bulle d'Orage is that we can imagine a balloon of a very large volume (100m in diameter) without major technological constraint: no need to find astronomical quantities of helium or hydrogen; the envelope which is very little constrained is achievable, while no material could withstand the pressure of a closed balloon. We can thus consider lifting several tens of tonnes at a very low cost, at altitudes where only rockets can go. One could for example hope to do without the first stage of Ariadne which weighs 350 tonnes out of 400, and which only serves to reach the upper atmosphere.


http://perso.orange.fr/ballonsolaire/historique51.htm
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Re: Photos of (very) original hot air balloons




by kira » 10/03/08, 20:35

Christophe wrote:A little bcp off topic but here are some beautiful hot air balloons:

https://www.econologie.info/share/partag ... fieres.pdf

ps: the energy balance of a hot air balloon must make it the most catastrophic transport in the world in CO2 / km. Passenger does anyone have figures in mind?


a word!
wouawww !!!!! : Shock:
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