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Forum: Tech Log

14th Sep 2010, 16:01

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

yes that is part of the efficiency figue - heat,...

yes that is part of the efficiency figue - heat, noise, bearing friction, and turbulent motion in the jet-wash itself that just increases the entropy of the world.

Forum: Tech Log

14th Sep 2010, 15:55

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

absolutely true. If you push against a wall...

absolutely true.

If you push against a wall you do no work on the wall as it does not move, but your muscles are still expending the same engergy - you get tired, muscles heat up, heart works...

Forum: Tech Log

14th Sep 2010, 15:30

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

ChristiaanJ...

ChristiaanJ (http://www.pprune.org/members/105267-christiaanj)

I fully agree... my simple expression for power says just that.

i.e. at constant forward speed the thrust just compensates for...

Forum: Tech Log

14th Sep 2010, 11:21

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

I think we can summarise all these muzings by...

I think we can summarise all these muzings by stating that regardless of what component ( nozzle, intake, engine support) communicates the thrust ( force) to the airframe, the bottom line is that the...

Forum: Tech Log

13th Sep 2010, 14:22

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

Going full circle to the start of thread where I...

Going full circle to the start of thread where I remarked that Concorde 'sucked its way through the air' it obviosuly wasn't too far from fact.

Still when one thinks about thrust one imagines...

Forum: Tech Log

11th Sep 2010, 14:37

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

Concordeski

Superb stuff guys.

Can't signoff without questioning how Concordeski designers solved the problem!

Forum: Tech Log

10th Sep 2010, 21:23

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

M2dude Thanks for your effort. Clearly the...

M2dude

Thanks for your effort. Clearly the answer rests on the interpretation of the axial pressure profile; not as simple to explain as a momentum exchange in a rocket engine or mass flow at...

Forum: Tech Log

9th Sep 2010, 14:56

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

M2dude As clear as mud but I'll give it...

M2dude

As clear as mud but I'll give it another read.

My previous post was written before I read yours and already hinted at the perpetual motion or free lunch situation that develops if the...

Forum: Tech Log

9th Sep 2010, 14:44

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

Brit312 The way it is stated in the web...

Brit312

The way it is stated in the web site its almost like you're getting a free lunch - like the engine delivering only 6% while the rest comes with the territory!

The compresion process...

Forum: Tech Log

9th Sep 2010, 13:06

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

OK the exact frasing is 63% (not 70%) as follows...

OK the exact frasing is 63% (not 70%) as follows as per link:

"During the Supersonic cruse only 8% of the power is derived by the engine with the other 29% being from Nozzles and an impressive...

Forum: Tech Log

9th Sep 2010, 12:02

Replies: 148

Concorde engine intake "Thrust"

Views: 116,324

Posted By b377

Concorde engine intake developed "Thrust"

It is stated that the engine intakes produce 70% (?) of the thrust during some portions of the envelope. It sounds as if the plane is sucking its way through the air. Can anyone elucidate on this?
...

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