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Forum: Tech Log

31st Aug 2014, 01:35

Replies: 40

What determines spool up time?

Views: 13,573

Posted By barit1

Looks have (almost) nothing to do with it. ...

Looks have (almost) nothing to do with it.

The Turboprop moves a large mass of air at relatively exit pressure, low velocity. Great low-speed (takeoff) performance, and efficient cruise at...

Forum: Tech Log

27th Aug 2014, 13:21

Replies: 40

What determines spool up time?

Views: 13,573

Posted By barit1

Yet another factor: The core engine may be...

Yet another factor:

The core engine may be capable of relatively fast acceleration, but if the acceleration is controlled in the traditional way - via a 3-D cam - one engine may wind up faster...

Forum: Tech Log

15th Aug 2014, 12:36

Replies: 40

What determines spool up time?

Views: 13,573

Posted By barit1

dixi188 To quote an old book title on my...

dixi188

To quote an old book title on my shelf, "It all depends".

A modern high-efficiency compressor might be quite happy at steady state conditions (TO, cruise etc) but have little tolerance...

Forum: Tech Log

14th Aug 2014, 16:07

Replies: 40

What determines spool up time?

Views: 13,573

Posted By barit1

The short answer: At a given speed, the...

The short answer:

At a given speed, the compressor can only pump a certain exit pressure. More precisely a certain pressure ratio Pout/Pin.

And since the turbine nozzle is a choke point,...

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