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Anonymous File :-(, x)
I'd guess that the exhaust doesn't so much damage the wings so much as it just deposits tons of crap on the top surface, which would be ugly, for starters.
Also, I feel like it must have a tendency to nose forward with the engines mounted so far off axis. Probably just requires an extra touch of trim, if it exists, but I'd guess its there.
And, my little tidbit that uses the word "technique" a bit broadly: I know that the extra lift really only comes into play during low-speed maneuvers, such as take-off and landing, and actually the principle that makes this work, the Coanda effect, is the same principle behind flaps on other aircraft.
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