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A comment on Boom (YC W16) – Supersonic Passenger Airplanes. Parent comment

Re:Boom (YC W16) – Supersonic Passenger Airplanes by kuprel on Tuesday March 22, 2016 @12:40AM (#11334454)
Specific energy of hydrogen is 142 MJ/kg. Why not a hydrogen fuel cell powered electric jet?
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Re:Boom (YC W16) – Supersonic Passenger Airplanes by taneq on Tuesday March 22, 2016 @03:23AM (#11334897)
Because hydrogen is very hard to store in any reasonable size or shape, and that's even without focusing on the inefficiency of generating it.
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Re:Boom (YC W16) – Supersonic Passenger Airplanes by jessaustin on Tuesday March 22, 2016 @07:42PM (#11340869)
Ammonia doesn't have this or several of the other drawbacks of hydrogen, but is otherwise equivalent.
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Re:Boom (YC W16) – Supersonic Passenger Airplanes by maaku on Tuesday March 22, 2016 @03:31AM (#11334925)
Drag on a bigger airframe.
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