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Re: Heating Helium?
by Andreas Burkart
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The expansion of the gas at a higher altitude does not provide any extra lift.
The higher you fly, the less pressure is around you, so the gas will
expand. But as the gas expands, the outside air expands as well. So
the weight difference between air and helium that provides the lift,
will decrease.
That means, the higher you fly, the less lifting capacity the airship will have.
This is one of the reason why the big airhships used low altitudes
like 300meters.
The Breitling Orbiter was using the heating provided by the sun at
day. And at night, the temperature of the helium was keeped by
burners, to maintain altitude.
http://www.breitling.com/orbiter/breit98/eng/projet/techniq/systemes.html
I´m sorry for the worse english I´ve to use, while I´m not a native
speaker and still training...
This heating of Helium is pretty interesting, I´ll do some
calculations later on.
Greetings,
andreas
2008/3/26, blimpship <duncan.rice@...>:
>
>
> Andreas Burkart wrote:
> >
> > This was used by Picard for the Breitling Orbiter.
> > The principle is called, Rozière balloon, but I never read about
> > airships that used this.
>
>
> It would seem that the Breitling Orbiter used the natural expansion of the
> gas at altitiude to provide the extra lift, the wikipedia article stating
> that the gas bag was filled to only 47% on take off.
>
> I have found
> http://www.stormingmedia.co.uk/68/6873/A687381.html?PHPSESSID=610ea123ae919a27de61b87eb7811970
> this short article relating to some Naval School thesis relating to tests
> on a dual enveloped airship using heating systems inside the internal
> envelope.
>
> "These indicate that the simple use of airship engine exhaust heat will give
> more than a 30% increase in gross airship lift"
>
> I might just have to buy this report and see if we can't get some more info
> on heating helium in airships.
>
>
> -----
> the past, present and future of airships : http://www.blimpship.com
> blimpship.com
> --
>
> View this message in context: http://www.nabble.com/A-Question-of-Temperature-tp16274781p16300790.html
>
> Sent from the The Airshipworld Mailinglist mailing list archive at Nabble.com.
>
>
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The higher you fly, the less pressure is around you, so the gas will
expand. But as the gas expands, the outside air expands as well. So
the weight difference between air and helium that provides the lift,
will decrease.
That means, the higher you fly, the less lifting capacity the airship will have.
This is one of the reason why the big airhships used low altitudes
like 300meters.
The Breitling Orbiter was using the heating provided by the sun at
day. And at night, the temperature of the helium was keeped by
burners, to maintain altitude.
http://www.breitling.com/orbiter/breit98/eng/projet/techniq/systemes.html
I´m sorry for the worse english I´ve to use, while I´m not a native
speaker and still training...
This heating of Helium is pretty interesting, I´ll do some
calculations later on.
Greetings,
andreas
2008/3/26, blimpship <duncan.rice@...>:
>
>
> Andreas Burkart wrote:
> >
> > This was used by Picard for the Breitling Orbiter.
> > The principle is called, Rozière balloon, but I never read about
> > airships that used this.
>
>
> It would seem that the Breitling Orbiter used the natural expansion of the
> gas at altitiude to provide the extra lift, the wikipedia article stating
> that the gas bag was filled to only 47% on take off.
>
> I have found
> http://www.stormingmedia.co.uk/68/6873/A687381.html?PHPSESSID=610ea123ae919a27de61b87eb7811970
> this short article relating to some Naval School thesis relating to tests
> on a dual enveloped airship using heating systems inside the internal
> envelope.
>
> "These indicate that the simple use of airship engine exhaust heat will give
> more than a 30% increase in gross airship lift"
>
> I might just have to buy this report and see if we can't get some more info
> on heating helium in airships.
>
>
> -----
> the past, present and future of airships : http://www.blimpship.com
> blimpship.com
> --
>
> View this message in context: http://www.nabble.com/A-Question-of-Temperature-tp16274781p16300790.html
>
> Sent from the The Airshipworld Mailinglist mailing list archive at Nabble.com.
>
>
> _______________________________________________
> The-List mailing list
> The-List@...
> http://airshipworld.info/mailman/listinfo/the-list_airshipworld.info
>
_______________________________________________
The-List mailing list
The-List@...
http://airshipworld.info/mailman/listinfo/the-list_airshipworld.info
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