Thrush Commander. Radio control stand-off scale crop duster model. Scale is 1/10.
Quote: "Get low and slow with this 56in sport scale crop sprayer for .40 four-strokes. Thriush Comander, by Ray Polidano.
EVER since I was a boy I had a picture of a rugged and chunky agricultural aircraft with an exposed Pratt & Whitney nine cylinder radial engine up front. When I found a three view of this plane in The Illustrated International Aircraft Guide on General Aviation I felt it was time to build. The model that can be built from this plan is a 1/10 stand-off scale aircraft intended for everyday flying and suited for 4-stroke engines. I had only a four channel radio available at the time of building but I am sure other builders can incorporate flaps and powder release systems to further increase the enjoyment of this model.
Tail first. I started construction by cutting out the tail plane and fin from medium grade 3/16 in balsa. Sand to airfoil section and cover with the covering of your choice. Hinge elevators permanently and fit the elevator horns. Epoxy the fin to the tail plane. Epoxy the assembly in place only after covering the fuselage.
Construct the fuselage. Start by cutting out the 1/bin balsa sides and 1/32in ply doublers. Glue the doublers to the fuselage sides making sure that you make a left and right hand side. Cut out all formers and drill Fl to take the engine mount. Drill F2 for the wing dowels and cut out to suit the fuel tank of your choice. Align the sides over the plan and join with F1, F2 and F3 ensuring the assembly is square. When dry pull in the rear, inserting F4 and checking again for squareness. Add F5, F6, F7 and F8 as per plan. Make sure that the fuel tanks fits and glue on the 7/16 in front balsa block.
The top fuselage can now be sheeted with 1mm soft balsa, sheeting from F1 up to F3 and from F3A up to F8, When dry, glue on the cockpit sides and top, cut 3 strips of 1/8 in hardwood to size, chamfer the bottom end of the two side strips and cut slots in the top of the cockpit roof. Glue strips to the cockpit roof and sides and when dry cut out the cockpit opening. Since a Y pushrod is to be used for the split elevators it is best to insert it at this stage, before sheeting the fuselage bottom. The tail wheel assembly must now be made out of 12 swg wire and brass tube as per the photo. When the assembly is complete epoxy it to the fuselage bottom and sheet with 3/32 in soft balsa. When dry, sand the completed fuselage.
Lift Here. For the wing, make a rib template from ply and cut out a set of ribs. Make 14 ribs from 1/16 in balsa and 4 from 1/8 in balsa. Cut out two wing tip ribs from 1/8 in balsa and four centre section ribs from 3/32 balsa. Begin construction with the starboard panel. Pin the lower spruce spar over the plan and glue on all ribs, the leading edge and trailing edge, after slotting for the ribs. Glue the upper spruce spar in place..."
Thrush Commander, RCM&E, April 1991.
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Article pages, thanks to RFJ.
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This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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