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Forum: Tech Log

12th Feb 2008, 19:56

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

Thanks for all the interest in this folks. ...

Thanks for all the interest in this folks.

Quote : Amber 1 "If you did it properly and at the right speed, the props would spool all the way up with no "dip". Most people got the hang of it but...

Forum: Tech Log

9th Feb 2008, 09:14

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

Basil : quote : 'some misguided souls considered...

Basil : quote : 'some misguided souls considered placing them to FF an amusing way to commence taxi. RPM would drop and TGT rise. Not a great idea.'

Is this the answer to my original question...

Forum: Tech Log

8th Feb 2008, 15:36

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

Chris - Thanks - you just got in before me: ...

Chris - Thanks - you just got in before me:

Just to note the Dart is a single spool animal - prop is connected to the one (and only) shaft. 2 stage of compressor (centrifugal) and 2 turbine...

Forum: Tech Log

8th Feb 2008, 15:21

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

Paradism - I assure you that this is not about...

Paradism - I assure you that this is not about the Doppler effect. What I (i.e. the lad at perimeter fence all those years ago) am talking about is the spool-up behaviour at the end of the runway...

Forum: Tech Log

6th Feb 2008, 20:07

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

Javelin - I think you're right - and what's more...

Javelin - I think you're right - and what's more I reckon it's doing a little dip too !

Forum: Tech Log

6th Feb 2008, 16:28

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

ABUKABOY - Thanks, I wondered whether rate of...

ABUKABOY - Thanks, I wondered whether rate of change of power demand had anything to do with it, though I would have expected it to be the other way around: i.e. if throttles were slammed forward,...

Forum: Tech Log

5th Feb 2008, 19:29

Replies: 54

BMA Viscount Spool-up Behaviour

Views: 7,876

Posted By jh5speed

BMA Viscount Spool-up Behaviour

As a lad standing at East Midlands perimeter in the 70’s, I used to be fascinated at how the engine note of a Viscount (813/4/5) on the takeoff roll would rise and then fall slightly before rising...

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