SIG Curtiss Jenny User Manual

THE PIPER J-3 CUB STORY The yellow Piper J-3 Cub is one of aviation's genuine classics. In the decades right before and after World War II, th

. 5.Completing The FuselageSteerable Tailwheel Unit Assembly 1. Temporarily bolt the two formed metal Leaf Springs together using the 6-32x1/2" M

. i. Next you must prepare the die-cut plywood Tailwheel Mount (TWM) for installationon the bottom of the fuselage. Refer to the instructions on assem

. i. Scrape the seam on the outside of the cowl to take out any rough spots or flaws. Low spots in the seam can be filled with Sig Epoxolite putty. Do

. Engine Cooling NotesThe most important factor in cooling a fully cowled model engine is to keep a constant stream of fresh, cool air moving through

. f. Cut a 1" long piece of wire, about 1/16" dia. or so, from left-over scrap pieces you undoubtedly have in your workshop. Form it into a

. g.Cut to length and glue in all 1/4" x 3/8" balsa ribs. h. Add 1/8" x 1/4" balsa braces where called for on the plan. i. When dr

. WING CONSTRUCTION NOTE: The basic structure of the Cub wing consists of three separately built components - a flat Center-Section, a Right Wing Pan

. l. When dry, unpin the center-section assembly from the plan so that you can see the locations for the ply P3 and the balsa WS-2 pieces. Glue these

. d. Cut two 1/4" Spruce Bottom Spars to length and set in place on the plan. e. Cut the 1/4" square Balsa Bottom Spar and Spar Doubler to

. o. Take apart and then reassemble the wing panel and center-section a few times to check the fit. A tight, but not binding fit is needed. If it seem

. The basic Cub design emerged in 1930 as the open cockpit Taylor E-2 Cub. It was the product of a fledging company in Pennsylvania headed by designer

. z. Install the Rear Strut Mount pieces in the same fashion as you just did the FSM pieces - only this time they got between the bottom rear Spruce S

. 13.Wing Tips a. Glue die-cut balsa parts T-4, T-5, T-6 and W6 in place on the die-cut ply wingtip plate WTP. b. Study the Wingtip Alignment Drawing

. 15.Cutting Out The Ailerons a. Locate the 1/4" sq. balsa Bottom Spar under the Top and Bottom Aileron Sheeting. Draw guidelines on both sheets

. b. Set the wing on the fuselage, sliding it forward as far as possible. Mark and drill a 5/32"x5/16" hole in the wing's Front Dihedra

. d. Taper the fuselage end of each 1/4"x5/8" Spruce Front Strut so it will fit onto the aluminum Lower Fitting along with the 1/4"x1/2

. m. Use the 4-40 hex nuts provided to fasten the bottom ends of the finished Front and Rear Jury Struts to the bolts in the spruce struts. Swing the

. FINISHING 19. Radio Installation It's best to mount all your radio equipment and pushrods before covering and painting, while you still have ea

. Your elevator and rudder pushrods should now be complete and operating freely. Fill in around the 4-40 pushrod wires where they exit the fuselage wi

. : If you elect to try this method in your Cub write to Sig for more detailed instructions on making the installation. Method 1- 2 ServosThe full-siz

. 20.Tips On Tanks A 16 oz. rectangular plastic clunk tank is recommended for use with most all .60 to .90 cu. in. glow engines. Refer to the engine m

. Hardwoods1 3/8"x1-1/2"x5-3/8" Basswood Wing Bolt Block2 1/2"x1"x6" Basswood L.G. BlocksWing Bolt Blocks1 1/2"x1/2

. Next give the entire model a coat of Lite-Coat clear dope. Thin the dope until it brushes on easily and flows out smoothly. Brush the dope on sparin

. 22.Sanding And Painting The Plastic Parts CAUTION: Do not try to cover any of the plastic parts with Monokote, Coverite, or other iron-on types of c

. Instructions for Dry Application Peel the paper backing sheet completely off the decal, being careful not to let the sticky side double over and adh

. 26.Installing The Windshield And Side Windows Cut the windshield from the 1-1/12"x17" clear plastic sheet, using the pattern on the plan.

. Under windy conditions, also hold up elevator when taxiing either upwind or crosswind. When going downwind, put the elevators in neutral or partly d

. Page 35 of 37Sig J-3 Cub SIGRC48 Build Manual

. Page 36 of 37Sig J-3 Cub SIGRC48 Build Manual

. If you have any technical questions or comments about this kit, or any other SIG product, please call us.SIG MODELER'S HOTLINE 1-800-524-7

. Engines The 1/4 scale Piper J-3 Cub can be flown with a wide variey of engines. In fact, there is such a vast number of good quality motors availabl

. Mufflers There is no one type of muffler that is best suited for the Cub. It all depends on the particular engine that you've elected to use. Y

. FUSELAGE CONSTRUCTION 1. Building The Fuselage Formers Due to their large size, some of the fuselage formers could not be furnished in one-piece, b

. f. Epoxy formers F5, F6 and F7 to the Right Fuselage Side and Cabin Top piece. Glue them on one at a time with 5-minute epoxy. Use a triangle to ge

. 3. Nose Assembly a. Epoxy the die-cut plywood firewall parts F1A, F1B and F1C together. Make certain that F1C is centered on the back. Carefully ma

. i. Glue in place balsa formers F2, F3 and F4, and the 1/4" square balsa stringer that goes between them. Check the exact locations of the form