am looking at a picture of Hanno PRETTNER and his Pattern plane of 1975 in the most recent MODEL AIRPLANE NEWS (March 2003) on page 34 (nice looking hat... )

QUESTIONS:

are those yellow protruding rectangles on the wings FLAPS?

why are they wider than the wing root chord?

IF they are FLAPS, would it be a good idea to install some on my 80s style .90 pattern ship? (well Hanno DID win in 1975 with those things right?)

if you have any info, let me know
OR if you know Mr. Prettner will you ask him for me? (don't say anything about the HAT thing... THNX)