About this Plan
Race-E. Radio control model. Electric park flyer. Wing area 242 sq in.
Quote: "Fly RC Free Pullout Plan. Electric fun scale park flyer for intermediate pilots. Race-E, by Harry Stewart.
Summary: The Race-E is a fun sport electric model with a classic Golden Age outline. Despite its small size, it flies like a much bigger glow model. It is very aerobatic and cuts cleanly through the wind. When it comes time to land, the large wing and its light weight let you fly slowly, and land like a feather.
Race-E is a lightweight, 4-channel park flyer. Its tapered wing and classic tail shapes give it a very attractive 1930's Golden Age look in the air. The prototypes have all weighed less than 10 ounces and have exhibited excellent performance with Model Motors AXI 2200 series outrunners. Race-E is not a 3D airplane; it is a very good sport acrobatic design and its flight performance can be compared to that of a very good .40 fuel-powered model. Its performance brings to mind the Golden Age air racers and especially the Hughes H1 which, if you stand way off and squint, it sort of resembles. Hence the name, Race-E.
On the Bench: Building the Wing: It can be difficult to build a tapered symmetrical or semi-symmetrical wing without a twist because it can't be built flat over the plan. To ensure that the wing is straight, build it upside down, blocked up over the plan so that the leading and trailing edges can be kept parallel and twist free. The lead-ing and trailing edges are oversized, and they are shaped after the wing halves are joined. A Master Airscrew razor plane is invaluable for shaping the spars and the leading and trailing edges.
Mark the location of the ribs on both leading and trailing edge pieces at the same time so that they will be identical. I notch the rib locations with a pair of hacksaw blades taped together. Use pieces of excess 3/8 square as standoff spacers.
Pin the leading edge to the spacers exactly over the leading edge on the plan. Then use the ribs to locate the trailing edge and pin it to the spac-ers. Insert the ribs with the spar cuts up and so that they are flush with the upper edge (actually the bottom edge; remember we are building the wing upside down) of the lead-ing and trailing edges. Insert the spar, mak-ing sure that it is flush with the ribs. Install the wingtips on the centerline of the R-7 ribs, and crack the spar at R-7 and fit it as a brace.
Block up the center of the wing so that the spar is 5/8 higher at the center than it is at R-7. Sand the dihedral angle into the spar and leading and trailing edges of both wings and butt glue them together with CA. Install the spar joiner, leading edge brace and the trailing edge filler. Sheet the center section. Cut the aileron servo hole and glue in the plywood mounts before attaching the bottom sheeting. You may have to cut a clearance hole in the top sheeting. Shape the leading and trailing edges.
The ailerons are built up from 1/16 sheet with 3/16 square leading edges and 1/8 x 3/16 ribs. Glue the lead-ing edges and ribs in place and shape them with the razor plane. Sand smooth. Notice that there is no rib at the R-7 location. Mark your hinge locations and slot the wing trailing edge and the aileron leading edge, then trial-fit the hinges.
Fuselage: Assemble the gear block from two pieces of balsa. Mark the gear leg angles and notch the two blocks. Carefully align and glue the two blocks together. When the glue dries, drill down through the notches with a 3/32 drill. Run it back and forth a few times so that the 2.5mm carbon fiber gear legs are a snug fit. Cut the gear legs to length. Bend axles from .047 music wire and attach them to the gear legs with shrink tube and gap-filling CA or better yet JB Weld.
Begin the fuselage by making two identical 1/16 sheet sides. Glue F-1, the gear block, F-3 and F-4 in place, using a square to make sure that they are perpendicular. Glue the opposite side in place. Pull the fuselage sides together at the rear and tack them together with CA. Install F-5. Install the wing hold down anchor, and sheet the bottom of the fuselage with crossgrain 1/16 from F-5..."
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