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Electroflight Team Aims To Fly 300 MPH On Batteries
Skywise wrote:
Larry Dighera wrote in : She also said the hydrogen would be compressed to ten bar, which would raise its energy density comparable to that of gasoline. I'm not so sure about that. An article I found many many years ago, published in 2002, discusses such things. If the information in the article is correct, it is extremely difficult to beat gasoline for energy density. It lists gasoline as having an energy density of 9000Wh/l (watt-hours per liter). 150 bar H2 is only 405 Wh/l. Liquid H2 is 2600 Wh/l. Lithium batteries are listed as 250 Wh/l, but mind you this was published 12 years ago. Battery technology has made large leaps since then. Even if they've only doubled in energy density since then, that would still beat 150 bar H2. http://www.tinaja.com/glib/energfun.pdf Brian For aviation use, the energy density by weight and volume are both important. Try he http://en.wikipedia.org/wiki/Energy_density Note none of these account for any required container, which in some cases can be very significant. -- Jim Pennino |
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