Hmmm, depends on the type
 

Yes, indeed so.

In the good 'ole B707, you needed quite a fistful of aileron/spoilers into the wind, just as the rotation was commenced.
Not much before.

Likewise with the Lockheed TriStar.

Those who rapidly charge down the runway from a standing start with full aileron from the get go are seemingly applying DC-3 procedures in a jet.

Incorrectly..........accept at rotation, as needed.

411A

Sorry but you are wrong, at least on Boeings. The modern wing "flies" from about 90 kts these days and you need to apply aileron at this point at the latest. I show guys in the sim what happens around the longtiudinal axis if you apply full aileron left and right as you barrel down the runway. Watch the sky pointer and you will see a few degrees of roll occur as the plane flies around the oleos.

Well JB, I did mention...it depends on the type.

Newer designs may well require slightly different techniques, but in older designs (especially the long body 707) the spoilers came up rather soon and far with small inputs, which degraded performance quite a bit.
Combine this with heavy weights and limiting runways, and you could well become up close and personal with the far end of the runway...;)

Thanks
 

Thanks to everyone for the advice and snippets of info that kinda show me what the general opinion of c/w effect is.
I'm going to go ahead and research this for a final project in college so if I find any interesting results ( which I hope to god I do!) then I'll keep you posted.

If anyone has any ideas or comments, please post them, no matter how outrageous or irrelevant you deem them ( with in reaso:)) as they might poimnt out things I might have missed.


thanks,

mscar