Control Liner F4F-3 Grumman Wildcat Article & Plans
May/June 1963 American Modeler

May/June 1963 American Modeler Table of Contents These pages from vintage modeling magazines like Flying Aces, Air Trails, American Modeler, American Aircraft Modeler, Young Men, Flying Models, Model Airplane News, R/C Modeler, captured the era. All copyrights acknowledged.

Control Liner Grumman Wildcat

Flying scale fans are certain to hail these detailed plans for one of the Navy's best known fighters, the F4F-3 Grumman. Scaled one inch to the foot Walt's model has a wingspan of thirty-eight inches, takes a glow plug engine from .29 (in very good health!) to .60. Hobby Helpers has full size drawings on Plan #663 for

Control Liner Grumman Wildcat

When the Japanese task force struck at Pearl Harbor December 7, 1941, the United States was woefully unprepared to battle the vaunted Mitsubishi Zero fighter. Only one airplane in Uncle Sam's arsenal proved itself against the Japanese Naval menace and this was the Wildcat, Grumman's first venture with monoplane all metal fighters. The most used version of this distinctive mid-wing design, the F4F-3, was the U.S. Navy's first line standard fighter and bore the brunt of the fighting in the South Pacific throughout 1942-1943 until it was replaced by the newer Hellcat and Corsair.

One of the most famous "Wildcat" pilots was Joe Foss whose exploits have been detailed in the recent April/May 1963 issue of "Air Progress" magazine. Plans show markings taken from Foss' Grumman. The ace is seen checking ammunition containers.

Joe Foss with members of his flight.

Fuselage construction detail.

Its relatively light weight and large wing area made the Wildcat extremely maneuverable and, therefore, more of a match for the Zero than the P-39 or P-40. In addition, the F4F was able to withstand considerable punishment from the enemy guns. Very few Wildcats went down in flames. It was with planes such as these that men like O'Hare, Hansen, and Foss were able to exact a terrific toll of Japanese aircraft over the Solomon Islands in the South Pacific as well as Wake Island in the north during our follow-up rounds in the Pacific.

Presented here is a control line model patterned after one of the Grumman fighters flown by Ace Joe Foss over Guadalcanal. It is scaled one inch to the foot which provides a general 38" wing span. Most any engine from a healthy .29 to a quiet .60 cubic inch displacement can be installed in the roomy nose. We recommend a .35 or .40 as ideal for all-round sport flying.

Construction begins with the wing. Cut spars and joiners, assemble these with proper dihedral. Cut ribs while assembly is drying. Cement ribs to spar fitting notches together, then cement bellcrank mount in place. Attach lead-out lines to bellcrank, slip these through rib holes. Bend wire control rod end, slip it into bellcrank. Bolt bell crank to mount. Cut leading edge and cement to ribs.

Butt join 1/8" balsa sheet covering to equal chord width of wing, then cut to wing outline. Cement lower covering to spar, ribs and leading edge. Hold with pins until dry. Bevel trailing edge of lower covering to follow upper camber contour, then cement upper covering in place, using plenty of cement especially along beveled lower covering. Rough-cut wing tips, drill for lead-out lines, cement to tip ribs. Set wing aside to dry.

Cut fuselage keel, formers, and engine mounts. Cut the elevator and stabilizer, sand to streamline section. Cement elevator halves to hardwood joiner, install control horn. Hinge stab to elevator, cement stab to keel top which also forms lower portion of fin.

Sandpaper wing structure thoroughly, then slip it through fuselage keel opening. Apply lots of cement when wing is aligned with keel and stabilizer. For a "commercial" fuel tank it will be necessary to cut away a bit of the wing as shown. (This does not affect overall strength because the spar is the main supporting member.) Fit tank in snugly by cutting through keel. Add plastic tube filling, vent, and feed lines; tape their ends to keep out dirt. Slip hardwood engine mounts through bulkhead holes and cement well. Add mount locks with lots of cement. Drill 1/8" hole through hardwood, then cement dowel into hole. Re-cement engine mount joints. Support tank with straps and/or with balsa wedges.

Cement fuselage formers in their proper locations - first slip control rod through former holes. Connect control rod to elevator horn, then check out control system.

Bend landing gear struts. Note only three attach to plywood foundations; remainder are fitted just for the scale effect. Install three main struts and hold with "J" bolts. Bind struts together with soft fine wire ... not aluminum wire. When struts are in position, solder joint. Secondary struts covered with thin plastic fuel line for scale appearance are now added.

Plank entire fuselage with balsa strips ... cement thoroughly to each other and to formers. Upon completion force Plastic Balsa into any small spaces left between planking. When thoroughly dry, sand fuselage with fine, then very fine, sandpaper.

Note fuselage fin fairs into turtledeck by a large fillet. Cut this from sheet balsa and cement it on each side of fin between fuselage and stabilizer. Add upper portion of fin atop stabilizer. Sand this installation then continue the fillet with Plastic Balsa. Cut, carve and sand rudder, cement to fin offset as shown. Apply several coats of cement along wing and tail joints to form a small fillet and strengthen the joint. Large fillets here are not required.

Cowl is four balsa blocks assembled along vertical and horizontal center lines. This facilitates separation later and keeps cost low. When cement is dry, carve cowl to its external shape and sand smooth. Then carve the interior with an X-Acto gouge. You can separate the cowl along one of the centerlines or work on it in one piece. Cut cylinder opening to fit motor.

Apply three heavy coats of Balsa Filler Coat to entire model, sand thoroughly when dry. Continue applying Balsa Filler Coat, with a light sanding after each, until finish is glass smooth. Thin final coats with ten percent thinner. We do final sandings with Flex-I-Grit abrasive-coated Mylar. We are now ready to paint.

Entire underside of model gets very light-blue dope, slightly tinted with green as per mixing instructions. Upper surfaces then are painted medium greenish-blue ... the color separating line must be wavy and hazy. A fine spray gun or artist's air brush is ideal for achieving this effect. If these are not available, light sanding with Flex-I-Grit and rubbing compound creates a hazy separation line.

Add cockpit canopy, interior, antenna mast, Wondur-Cals, wheel covers, wheels, and other details. Install engine, attach cowl. Use three-bladed propeller for optimum realism.

Balance completed craft as per plans via lead weight firmly fastened in extreme nose or tail. Use flight lines not less than .012" diameter. Their length depends upon your flying experience; we prefer to test fly on relatively short 40' lines, then gradually increase to 70'. A paved take-off and landing area is mandatory. An American Junior U-Reely control handle lets you take off from a restricted paved area on short lines, then unreel for some long line flying. Craft is reeled in for landing.

ACKNOWLEDGEMENT. The cooperation of A.E. Ferko and N.H. Hauprich, and their extensive knowledge of military aviation history, was indispensible to this article and is sincerely appreciated by the author.

Airframe construction drawing

(missing area in center due to magazine printing omission)

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Grumman Wildcat Plans

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Posted October 6, 2012