Gerhard Fiedler wrote: > I agree that it is very > likely that there is a downdraft in the air to provide the upward > force on the wing ... What, so the remaining unlikely part is magic? > And Olin, however hard he tried, wasn't able to stay within > one single reference system and do a momentum balance that would > result in a downdraft, parting from still air and a wing in horizontal > movement. Actually I mentioned it several times. The earth goes towards the plane a little bit to ballance the momentum of the air going down. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .