A320 Family Won't Rotate Until 160 knots?

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FL2070
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A320 Family Won't Rotate Until 160 knots?

Postby FL2070 » Thu May 12, 2016 1:14 am

Exactly as I said. I can rotate at a normal speed (120-140kt) but the plane won't leave the ground until 160+ knots. Any idea why?
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LesterBoffo
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Re: A320 Family Won't Rotate Until 160 knots?

Postby LesterBoffo » Thu May 12, 2016 2:55 pm

Borked wing area calculation, or bad main airfoil tables? Needs some flap lift/drag adjustments... :?:

Get out your text editor and tinker. :idea:

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Re: A320 Family Won't Rotate Until 160 knots?

Postby jwocky » Thu May 12, 2016 6:12 pm

Is that a JSB or a Yasim? In JSB, I know, there are planes out that took the lift calculation straight from aeromatic and that is often too little lift. Same with their engine thrust tables on altitude.
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FL2070
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Re: A320 Family Won't Rotate Until 160 knots?

Postby FL2070 » Thu May 12, 2016 6:41 pm

The A320-family is YASIM, I think.
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Re: A320 Family Won't Rotate Until 160 knots?

Postby jwocky » Thu May 12, 2016 6:45 pm

Yasim is not my beer lol. But Lester, Bomber and some others know more about it to run a test with more lift?
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FL2070
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Re: A320 Family Won't Rotate Until 160 knots?

Postby FL2070 » Thu May 12, 2016 9:48 pm

SORRY I'M AN IDIOT

A320 family is JSBSim
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Re: A320 Family Won't Rotate Until 160 knots?

Postby jwocky » Thu May 12, 2016 10:36 pm

Then go in the JSB file and search for "Lift", there is a channel calculating the lift due to alpha and it contains a little table. Just for a test, set the numbers in this table all over the board higher by 0.1, that should already show you if you have actually a mere lift problem there. If she flies normally, just rotates earlier and is still in balance, then it is just a lack of lift. The table contains basically factors used on the wing area.
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