I have a picture of the bottom of the plane Hanno flew at the 1977 pattern world championships in Springfield Ohio, but unfortunately my home pc is down right now and I can't scan it to show you. The first picture that John Mee has in his posting (I'm attaching it here as well) is the same color scheme Hanno had in 1977 when I saw him except the black on the top of the wing was a sort of lime green color. The entire bottom was painted this green color except for 3 stripes about 1 1/2" wide each going from the wheel well out close to the tip. The stripes were yellow, red, and white, in that order, from front to back. Same for the horizontal stab.
Besides having the honor of watching him fly, which he did extremely well, I also got to meet Hanno that weekend at the Museum at Wright-Patterson Airforce base. My friends and I walked in and directly in front of us were Hanno and I believe his dad. Dave Brown was there as well. They were all very cordial and signed autographs for us, and I got to shake Hanno's hand. I was hoping some of his skill would rub off, but alas it didn't!!!