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Forum: Tech Log

16th Apr 2014, 10:10

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

Numbers Jock. For B744ER with GE CF6-80C2B1F...

Numbers Jock.

For B744ER with GE CF6-80C2B1F engines close to standard conditions close to sea level.

Using Full rating thrust, Vs1g @ F20 varies from 160kt @ 412T to 120kt @ 230T whilst Vmca...

Forum: Tech Log

15th Apr 2014, 10:30

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

vilas, Were your attachment to become...

vilas,

Were your attachment to become visible to me, I would not be too interested in what it shows. I have been on about BOEINGs, in particular B744. I have quoted from their certified...

Forum: Tech Log

12th Apr 2014, 10:11

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

Jock, of course we configure as per the Boeing...

Jock, of course we configure as per the Boeing performance figures, F20 always. I used the clean case to avoid bogging down in what is a huge number of combinations when you start considering FR,...

Forum: Tech Log

11th Apr 2014, 11:52

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

vilas, Boeing says no such thing. All that...

vilas,

Boeing says no such thing. All that their graphs prove is that you will never have a Vmca problem, you'll stall first. The graphs say that you'll stall around 205Kt. So, one less thing to...

Forum: Tech Log

11th Apr 2014, 10:09

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

OK guys, Now I'm back on the ground, further...

OK guys,

Now I'm back on the ground, further info to my apparently shocking statement that Vmca can be and in fact is below Vs1g on big Boeings by a good margin.

Assuming 380T and close to sea...

Forum: Tech Log

9th Apr 2014, 04:50

Replies: 99

DO winglets have effect on Vref when landing?

Views: 17,746

Posted By mustafagander

Vilas, Vmca has absolutely nothing to do...

Vilas,

Vmca has absolutely nothing to do with any brand of Vs. Nothing at all. Vmca is about control surface power and thrust lever arms, meaning how much force the deflected controls, mainly...

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