This instructable covers how to construct the two different Killer Owl airframe types.
TAA USAF Designation: A73-2 (with winglets);
A73-2A (without winglets)
Step 1: Materials
1 Piece of 8.5 by 11 inch Paper
Step 2: Length and Corner Folding
Step 3: Nose Folding
Step 4: Tucking the Nose
Step 5: Wing Folding
Step 6: Make the Ventral Fins
First, measure 1 inch in from the wingtip along the trailing edge. Then measure 1.25 into the wing from the trailing edge, and make a line to that point from the trailing edge as shown. Use your ruler to then measure along the wingtip, one inch from the trailing edge. Then cut in between the point on the wingtip and the point 1.25 inches into the wing.
Step 7: Fold the Ventral Fins; Make the Winglets
Optional (For the "-2A" version):
Fold the ventral fins up to the bottoms of the wing and then fold the wings down. Then fold the wingtips up so that their edges meet the ends of the ventral fin cuts.
Step 8: Taping
The Killer Owl is indiscriminate when requiring tape. Both airplanes have common taping points. Tape the plane at its front and back, and then across the wing root at the rear.
Step 9: Flight
For the Killer Owl with winglets, a swift throw is necessary for long range, high speed flights. It can also be made to do stunts, such as loops, low-level flight and vertical climbs and recovery.
"A73-2A (No Winglets):
For this version, a moderately fast throw is necessary. This plane will fly a long range at a steady, moderate pace. This version can fly very slowly, and almost hover.