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"The Soviet Union successfully tested a Tu-154 plane flying on liquid hydrogen in April 1988." - really? No citation, is this just made up? —Preceding unsigned comment added by 79.70.36.42 (talk) 23:19, 23 April 2009 (UTC)[reply]

I'd like to see a citation for the manned Boeing plane in 2007.--Eljamoquio 21:40, 26 November 2006 (UTC

"hydrogen is the most energy-dense combustible fuel known": Can someone confirm this statement? It appears to me as being in contradiction with statement "the energy density of both liquid hydrogen and hydrogen gas at any practicable pressure is significantly less than that of traditional fuel sources." on Hydrogen#Energy_carrier 212.112.209.29 (talk) 17:46, 19 December 2007 (UTC) Dalexis[reply]

Energy density per unit mass is high compared with jet fuel, but per unit volume is lower. Mike Young (talk) 16:02, 7 January 2008 (UTC)[reply]

Energy density per unit mass or unit volume

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Volume is not a meaningful parameter for a gas without considering the pressure. In general, volumetric energy density of a gas increases as the pressure. Mathematically determining how it does so depends on the equation of state chosen. If we are going to make statements about the volumetric energy density, they should be backed up by pressures or pressure ranges, and we should always make it clear if and when we are talking about liquids. --Rhombus (talk) 08:28, 7 November 2016 (UTC)[reply]

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Nothing stands still ....

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Taken today from the Chinadaily site:

"An unmanned aircraft powered by hydrogen fuel finished 10 test flights recently, a concrete step by its developer the Commercial Aircraft Corporation of China in exploring new energy aircraft.

The technical verification aircraft, LQ-H, has a 6-meter wingspan and adopts the hydrogen fuel cell as its main power system, with a supplementary lithium battery system according to the company, also the developer of the C919 aircraft.

The latest test flights started earlier this year, and as of March 10 it finished 10 test flights with different tails and types of landing gear. Thus far, the aircraft has flown over 24 hours." 2001:8003:AC60:1400:4D59:67C7:ED1D:73AA (talk) 06:21, 30 March 2019 (UTC)[reply]

"Proposed hydrogen aircraft" section

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The idea of this section seems somewhat confusing to me. Some of the aircraft listed were actually made and flown, while others are just concepts, and the distinction between "current" and "historical" seems unclear. Any thoughts for cleaning this up? EPadgett (talk) 21:43, 16 December 2019 (UTC)[reply]

Agree. The section is confusing. --Ita140188 (talk) 01:02, 17 December 2019 (UTC)[reply]
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