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"TIP OF THE MONTH" Contest "COUGAR" FOLDING-WING DETAILS

By Marvin D. Becker, EAA 3238 11571 Palmwod Dr., Garden Grove, Calif. OLDING-WINGS is not a new idea and there have been F many methods of accomplishing this feature in past designs. The method used on my "Cougar" has worked fine for me, but perhaps you can improve a few features to suit your needs.

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Close-up

COOQKR FOUdua WINOi

view of a universal.

There have been many inquiries about the details on this folding-wing which prompted me to present the material here. Very little extra weight penalty is added with the full universal at the rear spar, the front spar-attach point which is beefed up and extended 2 in., and the nuts welded

to gussets for wing stowage. Setting the ship up for flight takes 20 to 30 minutes depending on how many questions I answer for the group that gathers. The front-spar and lift strut are completely removed for folding. The struts are stowed in the cockpit. A set of tail lights with stop and turn signals is slipped on the prop blades for travel to and from the airport and the "Cougar" is pulled on its gear backwards, by a "bolton fuselage" tow-bar made from large streamline tubing.

I have logged about 1,000 miles of trailer operation since the first flight on September 12, 1961 without any

problems. She fits very well in my garage, the highest point is 6 ft. 6 in. at the aileron with the wings folded. See the May, 1961 issue of SPORT AVIATION for more pictures and construction details on the "Cougar."

CRIMPING TOOL

By Russell W. Riter

EAA 12838

Sky Harbor Airport Northbrook, 111. and cut out between rivet positions, I have formed a lot of ribs and formed while bending the 90 deg. bulkheads over plywood using 2024T3 however, I have made a tool that flange, the main material takes a makes a little crimp between rivet up to .063 but, as anyone who has curve when it usually should be flat positions and straightens the rib. A formed them knows, when a curve is and straight. The flange can be drilled 36 JANUARY 1965

couple of pieces of angle iron were cut and the edges were all rounded and smoothed. They were then brazed to a pair of vise-grip pliers. After forming and trimming the flanges, mark the rivet spacing and

then crimp between the rivet spacing

just enough to straighten the rib. Also shown in the picture is one size of lightening hole flange die. I made a set from 1 in. to 3% in., by V* in. increments. Simply lay out the holes, saw out with a hole saw, smooth the edges and press the flange with a vise or a press. They look as professional as a factory job.

SPORTSMAN'S CRADLE

By Kenneth C. Walton, EAA 12488 1 Stuart Ave., Chateaugay, N. Y.

This simple and inexpensive cradle will greatly simplify the problem of handling and moving the fuselagehull of a Volmer VJ-22 "Sportsman" during its construction. There is no reason why the cradle could not also be adapted to original design amphibian.

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