Michael thanks for answering on my post.
The all red wing tip #3 is the one that I designed using Hoerner and adding concave curve to the tip. Saw a picture of a Reno Mustang # 69 using this method.
The though behind this shape is, air flow is diverted for less educed drag in high speed turns, helps hold a knife edge from pylon one to two and from pylon three back to one, also acts as wash out to help in slow speed landings.
Also thanks for listing my R140 Quickee 500 airfoil on UIUC airfoil data site. I try to read every thing you publish.
Pictures are top front bottom and back of wing tip.