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Forum: Tech Log

9th Dec 2008, 16:29

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

Good job you were not involved in autoland...

Good job you were not involved in autoland certification for the 737, JT :) - it often (naturally) touches down at speeds a fair bit below 'Vref'.

Forum: Tech Log

20th Nov 2008, 07:58

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

Although I generally have my eyes closed and...

Although I generally have my eyes closed and hands clasped in front of me in a prayer-like manner, I would say the 737 can land you as low as Vref-10 depending on what happens during the 'flare'. If...

Forum: Tech Log

17th Nov 2008, 08:07

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

- and that, in my book, is correct. If the...

- and that, in my book, is correct. If the approach is correctly flown, it matters not too much what speed the a/c is flying BEFORE touchdown as it is only the energy AT touchdown that affects...

Forum: Tech Log

16th Nov 2008, 07:36

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

- I know nothing of the way your a/c landing...

- I know nothing of the way your a/c landing performance is calculated, but NORMALLY limiting landing weights are predicated on a given touchdown speed. This should be determined in the...

Forum: Tech Log

15th Nov 2008, 08:27

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

framer - my understandng of 'threshold' is start...

framer - my understandng of 'threshold' is start of runway, which should be crossed at around 50', so in my book, Vref+5 at 50' is the target, as you are doing.

Forum: Tech Log

12th Nov 2008, 11:45

Replies: 76

Vref & landing

Views: 62,821

Posted By BOAC

Vref is supposed to be the min speed at ?50ft' on...

Vref is supposed to be the min speed at ?50ft' on finals, and I have always been taught that this SHOULD be bled off towards touchdown, and touchdown SHOULD occur at a minimum of Vref-5 - although...

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