In the book I referred to, they do call the outboard portion a 'flap'. I'm never sure just exactly how accurate these drawings are. There may also have been different configs. As far as dual slotted flaps-wouldn't even attempt it! And,yes, Mike I have been following Harold's SU for some time. Good idea though, I'll email him, with all the drawings,etc. he may have the answer. As agile as that plane is supposed to be, it seems odd-no ailerons. The MIG29 apparently has them. Wish I knew where there was a full size sitting around here in the CONUS.