Jeep
What a question to ask, as if you didn't know!!
MG has the UK answer sewn up there, you an A2 yet MG or is all that planking getting in the way?
However, in the States as every patriot will tell you, if it doesn't say its a coupling effect in 'their' fundamentals of flight, then it aint true, dont forget me old mate, you need a reference for everything you say!!!
If you look in F of F page 5-26 para 1, the US explanation. Sorry to be so sad!
email on its way.