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Forum: Tech Log

14th Sep 2004, 06:32

Replies: 16

Weight of air in?

Views: 1,725

Posted By Genghis the Engineer

TAS factors inversely with the square root of...

TAS factors inversely with the square root of relative air density. So, if we're at the altitude giving 35% (or 0.35) the inverse square root of that is about 1.7.

So, back to my quesstimate of...

Forum: Tech Log

13th Sep 2004, 23:01

Replies: 16

Weight of air in?

Views: 1,725

Posted By Genghis the Engineer

Sorry Thunderball, but at 35,000 ft the air...

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 - still in the...

Forum: Tech Log

13th Sep 2004, 10:05

Replies: 16

Weight of air in?

Views: 1,725

Posted By Genghis the Engineer

Just a quick back-of-envelope sum. Let's say we...

Just a quick back-of-envelope sum. Let's say we are doing 350 mph as you say, and has an intake diameter of 3 metres.

A 3 metre diameter implies a cross-section of about 7m². 350 mph equates to...

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