This is a continuation of the presentation material from Bob Hoey's September 21, 2002 talk at the TWITT meeting.  This page covers the Seagull model.

Bob Hoey showing the group his Seagull model.  This gives a good perspective of the complexity of the wing in terms of the crank and sweep as seen from the in-flight shot provided by Bob.  This is different than the others in that seagulls don't have the individual tip feathers like the raven and turkey vultures.  In the left picture you can also see that the tips are in line with the leading edge, however, Bob says that the model flies best with them at -10 degrees.

More shots of Bob explaining what it took to get the Seagull to fly well.  He noted it was very tricky building the wings with the complex curves, angles, dihedral and, anhedral.  Right, Bob is demonstrating that the tips can be moved together in incidence using the radio's electronic mixer function and, then like ailerons once the desired incidence angle is reached.  The small rectangle in the center of the body is the tab used to hold it under the launching mother ship, which folds flush after release.

Here are a series of shots showing the Seagull from different angles.  The first version had a flat horizontal stabilizer, but Bob says the angled modification hasn't seemed to made any difference in performance or controllability.
This view shows the parachute cloth being used between the main wing section and the moveable tip.  Bob thought that this might smooth out the flow over the wing while the tip was moving instead of there being a butt joint that might be causing interference.  Flight tests have shown little, if any, improvement in control response.  It was one of those experiments that didn't result in a better performing model.

Part 1, Turkey Vulture....
Part 3, Pelican...
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