You're wrong for the right reasons. This would only be a counter-example to the Coanada effect if the xkcd diagram was a correct example of lift. The diagram

You're wrong for the right reasons. This would only be a counter-example to the Coanada effect if the xkcd diagram was a correct example of lift. The diagram in this comic would actually produce zero lift, see: http://www.amasci.com/miscon/miscon4.html#wing http://www.amasci.com/miscon/miscon4.html#wing