|WikiProject Technology||(Rated Start-class)|
I merged this article with Lighter than air and redirected the page. Almost all of the information in this article was taken from that one; the few new additions have been copied to Lighter than air. Stebbins (talk) 05:50, 14 January 2009 (UTC)
- The article should not be merged (see Talk:Lighter than air#Merge tag). Inwind (talk) 10:09, 21 January 2009 (UTC)
--Navigaiter2 (talk) 22:47, 17 January 2010 (UTC) I softened the misleading statement that "most countries have banned hydrogen for lifting gas in manned vehicles" because it made no distinction in types of manned vehicles. After reading FAR Part 21, I found that they ban H2 only for purposes of granting what they call a "Type Certification." It is the set of ultimate government safety hoops which apply to commercially manufactured vessels destined to be used for human passengers and air freight for money. Ultralights and Experimental class airships are usually made at home and do not require a type certificate. See our airship design workshp at smallblimps.lefora.com Allen Meece, the Navigaiter ;-]
I have added a lot of text and I did many modifications:
I had originally translated this English article into Dutch (my native language), then I added a lot of interesting stuff to that Dutch text, and now I added the same things to the original english text. But, because I'm not a native english speaker, there may be language errors or strange word choices in my text. Please feel free to correct them and make fluent english text out of my words. --Erik Wannee (talk) 13:53, 17 April 2011 (UTC)
Question about lifting gas in Vega mission balloons
I have a question: The balloons in the Vega mission on Venus used helium as lifting gas. As explained in this article, this is not necessary in this quite dense atmosphere. Helium has the disadvantages of diffusing easily through a balloon's wall, the need to be transported in a compressed cilinder, and having to be inflated into the balloon at the right moment.
That raises the question why they didn't simply bring some water in this balloon? During the journey in interplanetary space it would stay compactly frozen; as soon at it will enter the hot venus atmosphere (during a parachute descent) it will be heated to steam, automatically inflating the balloon. No pressure vessel needed, no special valves to let the gas into the balloon: fewer things that can fail. The lifting power of steam on Venus will certainly be sufficient to float a balloon in Venus' atmosphere and it will not easy diffuse through the balloon wall.
Who can explain why they have chosen for helium? If you have a good explanation, please add it to the text of this article. Erik Wannee (talk) 19:59, 1 June 2011 (UTC)