The next plane is not scratch built but close to it. The wally wing (ww) is based on a foam glider sold at Wal Mart and other department stores called the Sky raider.
First you need to cut down the wing halves to the desired size. I have built both 24" and 28" wingspans and both work well. use the photos I've attached to select your angle on the leading edge. The shorter one has more angle (sweep) and flies more stable. The longer one has less sweep and is more manuverable. Once you have cut the wing halves to the desired size, the next step is to cut out a wooden piece to the contour of the wing. Now you have a choice to make. You can carve out a runner on the bottom of the wing and an elevated area on the top (to mount the motor). I tried one with both a runner on the bottom and top and another with only a runner on the bottom. Again, your choice as either will work. The wood I used it 1/8" balsa but you can also use basswood or light ply which are stronger but heavier.
The wood is cut to the desired shape and sandwiched between the wing halves ( <|> ). Then the other wing half is attached making the familar v shape we have all grown to love. Glue together with either 5 min. epoxy or probond. The glider wings are not cleanly molded so you will need to do some sanding to get a nice clean shape. Be sure to check wing thickness as every wing I checked was thicker on one side than the other. I used 320 grit sandpaper and it went pretty fast. After you are happy with the shape, you make some winglets and either glue or tape to the sides. A good starting size for winglets is 5" long and 4" high. For quicker rolls, I used 3 1/4"h on ww#2.
Now you simply add electonics and tape to finish out the plane. I used the following gear in mine:
ww#1 - gws 4 channel receiver, gws 5amp esc, 2 gws naro servos, a gws motor from a dx-a geared unit, gws 3x2 prop. Weight w/ 6-cell 700mah pack is 6.9oz.
ww#2 - gws 4-channel receiver, gws 5amp esc, 2 hitec hs-55 servos, a johnsone 250 motor ($1.00 surplus), gws 4x2.5 prop w/ rubber adapter. Weight was 7.3oz with 6-cell 700mah pack. The result was a very inexpensive airplane that was a ball to fly. Try it you will like it!
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