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Forum: Tech Log

22nd Mar 2007, 17:11

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

Precisely. They take the swirl downstream of...

Precisely.

They take the swirl downstream of a (shrouded) fan, and convert it into (nonswirling, more direct) jet blast. They spend some of the energy for drag, but they still gain more energy by...

Forum: Tech Log

21st Mar 2007, 16:18

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

Turboprops are also driven with gas turbines. ...

Turboprops are also driven with gas turbines.

Why do turbofans find the swirl-compensating stators to be efficient, rather than a source of extra drag?

Forum: Tech Log

20th Mar 2007, 17:46

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

And why don´t shrouded stators cause drag?

And why don´t shrouded stators cause drag?

Forum: Tech Log

20th Mar 2007, 15:39

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

Indeed. Is there any reason a propeller...

Indeed.

Is there any reason a propeller aircraft cannot use stators?

Forum: Tech Log

16th Mar 2007, 15:59

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

Ground clearance is obvious. But what does tip...

Ground clearance is obvious. But what does tip speed have to do with limiting propeller diameter? Obviously, a propeller of whatever diameter suits ground clearance should be rotating at whatever rpm...

Forum: Tech Log

15th Mar 2007, 17:15

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By chornedsnorkack

Yes, they would. But twin does not need critical...

Yes, they would. But twin does not need critical engine anyway - you can have two conventional contrarotating props, and no critical engine.

But if you have two contrarotating props which are not...

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