Thanks to all,
Sure enough the outcome of performing an unbalanced cross controlled landing is a high profile drag, and hence its use by barnstormers and as last attempt tricks in 737 sim checks.
Where I'm interested is at the takeoff stage. I can only assume that crossing controls must have a small influence on the aircraft drag polar on take-off as said above.
But where would I find this out for sure? Has anyone read any articles, performed the research, crunched the numbers to find this out?
All the best,
mscar