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Forum: Tech Log

18th Sep 2004, 08:37

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

Thanks, SR71, that is a very good explanation -...

Thanks, SR71, that is a very good explanation - it must be if I understand it!

And fascinating to look through the flight manual - a great link.:ok:

Forum: Tech Log

17th Sep 2004, 20:51

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

SR71 ...

SR71
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"I guess its the three dimensional equivalent of the area velocity relation in quasi one dimensional flow:...

Forum: Tech Log

14th Sep 2004, 23:09

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

If you go back 20 years or so to the days when...

If you go back 20 years or so to the days when the "Flight" directories were fairly serious works of reference, you'll find exactly what you describe. The mass flow rates at maximum sea level thrust...

Forum: Tech Log

14th Sep 2004, 13:29

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

"...at this speed, the length of the engine had...

"...at this speed, the length of the engine had grown 6 inches and its diameter by 2.5."

Who needs Viagra? Just go hypersonic!

"What I find amazing is that, depending on which source you...

Forum: Tech Log

14th Sep 2004, 08:25

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

Genghis, "Sorry Thunderball, but at 35,000...

Genghis,

"Sorry Thunderball, but at 35,000 ft the air density drops to about 35% of it's sea level value, which would bring my crude back of envelope sum down to about half a tonne per second -...

Forum: Tech Log

13th Sep 2004, 21:54

Replies: 16

Weight of air in?

Views: 1,726

Posted By Thunderball 2

...fascinating stuff, but that's at sea level of...

...fascinating stuff, but that's at sea level of course. Go to 35,000' and the air density drops to less than 1/100th of the sea level value. So even at 600 mph, according to the back of my beer mat,...

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