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Forum: Tech Log

28th Mar 2007, 23:14

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By barit1

Excellently put question, Dick. The extra thrust...

Excellently put question, Dick. The extra thrust comes from a two-step process:

1) Capture the vortex energy by turning the air back parallel to the direction of flight. In the process of doing...

Forum: Tech Log

22nd Mar 2007, 20:40

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By barit1

http://www.airwar.ru/image/i/attack/fantr-i.jpg ...

http://www.airwar.ru/image/i/attack/fantr-i.jpg
Theoretically possible, and occasionally implemented.

Forum: Tech Log

22nd Mar 2007, 12:05

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By barit1

It's a matter of semantics. Different donkmakers...

It's a matter of semantics. Different donkmakers have different terminology; Pratt's tower shaft is GE's radial drive shaft.

But vains, veins, and vanes all have distinct and separate meanings. :}

Forum: Tech Log

22nd Mar 2007, 00:05

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By barit1

Like everthing else, there's a bit of tradeoff...

Like everthing else, there's a bit of tradeoff (airfoils have lift AND drag, don't you know).

But to merely call the stators "swirl-compensating" misses the point. They convert the swirl or vortex...

Forum: Tech Log

20th Mar 2007, 21:03

Replies: 36

Contra-rotating props and Bernoulli etc

Views: 7,026

Posted By barit1

The "shrouded stator" bit works best when it's a...

The "shrouded stator" bit works best when it's a convergent duct, yielding a higher exit velocity for greater cruise efficiency. This can be done with a smaller rotor diameter, bringing the drag...

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