Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Future Of Hydrogen Hyper-jet Airliners  
User currently offline747400sp From United States of America, joined Aug 2003, 3677 posts, RR: 2
Posted (6 years 8 months 4 weeks 1 day 13 hours ago) and read 6831 times:

On the cover of Feb. 2008 Popular Science, shows a new jetliner call the A2, the A2 is Hydrogen Hyper-jet airliner design to carry 300 passengers at the speed of Mach 5. The A2 do not have any windows due to it speed, also due to it's four Scimitar engines it is a clean burning jet. As written in Popular Science, For takeoff, landing and subsonic flight, the A2's Scimitar engines sends intake air through a bypass duct and into a turbine, like a standard jet engine. After reaching supersonic speed, though, the engine redirects air from the bypass duct through the engine core for flight up to Mach 5. Like a ram jet, the Scimitar works by taking in air from the atmosphere at high speeds and funneling (or " ramming") it until it's intensely compressed. At this point, the extremely hot air mixes with fuel and causes ignition. But the Scimitar one-up traditional ramjet design by adding a turbine that compresses the incoming air even further. Ramjets usually can't use turbines because the incoming air is so hot that it will melt the turbine blades. The Scimitar solves that problem by first cooling the air in a heat exchanger using gaseous helium.


So, could the A2 work, and if yes , do you think passengers would want to trade in windows to make a 22 hour flight only 4 hours?

2 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17068 posts, RR: 66
Reply 1, posted (6 years 8 months 4 weeks 1 day 12 hours ago) and read 6813 times:

I would note that Popular Science and so forth need interesting covers in order to sell magazines. This kind of project has been "front page news" since at least the late 50s.

I'm all for really fast, really cool airliners, but I don't see this thing happening anytime soon.

Quoting 747400sp (Thread starter):

So, could the A2 work, and if yes , do you think passengers would want to trade in windows to make a 22 hour flight only 4 hours?

Depends on the price, but yes, some of us would.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (6 years 8 months 4 weeks 1 day 10 hours ago) and read 6793 times:



Quoting 747400sp (Thread starter):
But the Scimitar one-up traditional ramjet design by adding a turbine that compresses the incoming air even further.

Strictly speaking, that would be a compressor, not a turbine.

Quoting 747400sp (Thread starter):
Ramjets usually can't use turbines because the incoming air is so hot that it will melt the turbine blades.

This doesn't sound right to me...the highest temperature in any engine is downstream of the combustor. If the engine can tolerate that temperature there's no reason that the incoming air temperature should be a problem (it just requires that you use turbine materials for the compressor...pricey but possible).

Quoting 747400sp (Thread starter):
So, could the A2 work, and if yes , do you think passengers would want to trade in windows to make a 22 hour flight only 4 hours?

In principal, yes, but you're talking about an *enormous* fuel burn, which implies a hydrogen and helium infrastructure that just doesn't exist today as well as significant energy cost. If I had that kind of money I think I'd rather spend 22 hours on my comfy private jet rather than 4 hours on a windowless commercial jet.

Tom.


Top Of Page
Forum Index

Reply To This Topic Future Of Hydrogen Hyper-jet Airliners
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Source Of Noise From A Jet Engine? posted Fri Nov 18 2005 20:58:50 by Lehpron
The Future Of GPS. Will It Replace The Nav Radio? posted Tue Jan 11 2005 04:22:44 by Hmmmm...
What Is The Power Of VHF Radios On Airliners? posted Sun Oct 10 2004 23:25:31 by KDTWFlyer
The Future Of Diesel Engines...looks Bright posted Mon Aug 23 2004 12:51:28 by TripleDelta
What's The Future Of Aerospace Engineering? posted Thu Jul 26 2001 04:21:32 by Lehpron
Future Of The TWA 717? posted Fri Jan 12 2001 06:28:21 by Wyorca
Single Engine Airliners Of The Future? posted Wed Nov 29 2006 15:59:29 by DHHornet
Types Of Jet Engines posted Wed Nov 7 2007 12:32:25 by AlexEU
Effect Of Air Pollution On Jet Engines posted Sun Sep 23 2007 07:52:40 by Thai744
A Tri Jet The Size Of The A380? posted Sun Aug 26 2007 08:22:29 by NEMA

Sponsor Message:
Printer friendly format