Woody's Wagon. Free flight model from Model Airplane News, Jan 1950. FF plan for K&B Torpedo .035 Jr. Wingspan 32 in, wing area 150 sq in.
Quote: "Woody's Wagon, by WS Blanchard Jr.
THIS little ship has been designed for top contest performance using the new K & B Torp-Jr .035 power plant. This engine in outward appearance is a scaled-up K & B Infant. However, due partly to a change in port design, the power has been increased tremendously. The Torp-Jr. will swing a 6 in Spitfire prop close to 10,000 rpm using Racing 25 or Ohlsson AA fuel. So, with a minimum required contest flying weight of only 3-1/2 oz, under present AMA rules, climb is terrific. And with 150 square inches of wing area, the wing loading is less than 2-1/2 oz per hundred square inches, which makes for a real thermal-hunting glide.
Woody's Wagon is a redesigned version of an OK Cub powered ship with which the author won first place in the 1949 Middle Atlantic States Championships. Hence, by ballasting the ship up to 4.9 oz, an OK Cub may be used in this airplane for contest work. Or, at 4.5 oz, the Anderson Baby Spitfire may be used.
If you want a fine little contest ship, or a long-lasting sport model to fly on that under-sized baseball diamond, let's get to work. You'll find that this ship goes together in a hurry.
For the fuselage, select a medium-hard, straight-grained strip of 3/8 x 1/2 balsa for the tail boom. Note that the boom ends at the rear face of the firewall. Cement strips of 3/8 x 1/2 balsa to the sides of the boom to form the top of the fuselage pod. Then cement the medium hard 1/8 sheet balsa keel in place. Next, cement the 1/16 plywood firewall in place. Bend the landing gear as shown in the drawings, and attach to the rear face of the firewall, using two short lengths of 3/16 square hard balsa grooved to receive the landing gear as shown. Use plenty of cement. Next, cut the pylon from medium hard 1/8 sheet balsa, and cement in place. Cut the two halves of the wing-mount platform from 1/8 sheet balsa, and cement in place. Go over all these joints several times with cement, forming fillets around the platform and the base of the pylon, and around the rear of the firewall.
Now, lightly cement soft balsa blocks alongside the keel and carve to shape. Then cut them loose and hollow to about 1/8 wall thick-ness. After cementing the engine mounting nuts to the rear of the firewall with the bolts in place, cement the fairing blocks in place. Cement the tail mount platform and the sub-rudder in place, and sand the entire fuselage carefully.
Wing construction is very simple. First, make a rib template from hard balsa or any other available material. Cut out 26 ribs from medium 3/32 sheet balsa, using the template directly as a guide for your blade. The ribs should have a cross section 3/32 square at all stations.
Cut out the wing tips. Now pin down the leading edge, trailing edge and tips, directly on the plan. Cement 3/32 square strips in place at each rib station. Then cement the two wing spars in place, followed by the upper ribs. The upper ribs should touch both spars, and should be cemented well at all joints. When the wing is dry, remove from the drawing, and build the other side directly on it (bottom to bottom). When dry, cut both sides at the outboard dihedral break, and install the dihedral butt-plates. Assemble the wing with 11/4 dihedral at the first break, and 31/4 at the tips. Sand thoroughly.
The tail is built in a manner similar to the wing. Cut 12 ribs using the tail rib template. Trim the shorter ribs from both the leading and trailing edges..."
Update 09/01/2019: Added article, thanks to RFJ.
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