KIT 903
DeHavilland DHC-1 Chipmunk
17" Wing Span - 13" Overall Length - Approx Scale: ½"=1'-0"
COPYRIGHT 1967 BY PAUL K. GUILLOW, INC.
Set fuselage formers over the notching patterns shown below and mark stringer notches with pencil (FIG. 1). Next cut out the notches with point of a razor blade or knife, (FIG. 2). Cement 1/16" sq. cross braces to formers B, C, D, E and F. Mark notch ribs in same manner as formers.
FORMER
ASSEMBLING THE MODEL

When assembling model, check with three view plan to see that parts are in correct alignment. Do this before cement holding parts together hardens. Assemble the model as follows: Cement the stabilizer to the top of fuselage tail. Cement the rudder to top of stabilizer and  fuselage (score tissue where parts are joined

for good cement bond) and then add piece R-4. Cement wing panels to sides of fuselage - be sure to check the wing for proper dihedral before cement hardens - see front view.

Add wing fillets W-9. Spray model lightly with water to shrink tissue - use insect sprayer or

similar devise. Bend landing gear wires to shape with needle nose pliers. Cut a slit in tissue between bottom of wing ribs W-2 and W-2A. Cement landing gear solidly between ribs. Add 1/16" sq. strut brace and stiff paper oleo strut. Attach wheels. Bend tail wheel wire to shape and cement to "H" and "I". Add tail wheel.

WING RIB
FIG. 1
FIG. 2
Press all die-cut parts from balsa sheets, work carefully to avoid splitting. Use point of single edge razor blade to free any piece that fails to punch out easily. If you split one of the die-cut pieces, cement together and let dry. Arrange the parts on a board or table with the printed side up for quick identification.
Set former "C" in position between side frames but DO NOT cement at this time. Next cement former "A" between the nose ends of frames - hold with fingers or rubber band until dry. Do not squeeze too hard or you will be apt to crush the frame and consequently have to repair it.
Clear the former notches in fuselage side frames with point of blade. Pin the two side frames together on a work board (FIG.3). Apply a generous coat of cement to the tail end of frames (ARROW). After cement dries hard, remove pins and open nose end of frames (FIG. 4). The cement will act as a hinge while holding tail end together.
FUSELAGE SIDE FRAMES
COMMON PIN
FIG. 3
FIG. 4
FIG. 6
Build the right and left wing panels over layout on other side of plan. Lay plan on work board and pin sheet of wax paper over layouts. Start by pinning the bottom spar in place and then cementing W-7 to spar. Cement ribs to bottom spar and then add the leading and trailing edges. Finally, cement the DIE-CUT wing tip W-8 and top spar in place. Be sure that all the cement joints are thoroughly dry before moving frames.
Line up side frames carefully (FIG. 5) and then set formers B, D, E, and F into place. After checking the alignment, cement all corners where formers and frames join (FIG. 6). When dry cut frames apart where cemented together at tail and add formers G, H, and I. Cement tail pieces "J" together, Carve to shape and cement to tail fuselage. Cut and cement 1/16" sq. stringers in place as shown in large perspective.
FIG. 5
RIGHT
WRONG
COMMON PINS
WAX PAPER
Sandpaper fuselage frame lightly to remove all balsa fuzz. Cut out and cement the stiff paper cockpit patterns in place. Cover fuselage with sections of tissue - the side frames first and then the top and bottom areas. Apply the tissue dope only to the edge of balsa frame members that come in contact with the edges of tissue on the outside of the frames.
The rudder and stabilizer frames are built over the layouts on opposite side of plan. Pin wax paper over layouts and then pin the die-cut balsa pieces in position. Cut and fit the balsa spars and then cut and add rib members (all 1/16" sq. strip stock). When dry, remove from wax paper and trim ends of spars as required.
THIS BOTTOM SECTION IS LEFT OPEN
2 PIECES OF TISSUE
INSTRUMENT PANELS - CEMENT TO FORMERS C & D
COVER BOTTOM SECTION BETWEEN ARROWS WITH SINGLE SECTION OF TISSUE
WING TIP SECTION COVERED SEPARATELY
Cut the plastic nose cowl free from formed sheet (FIG. 7). Then cut hole for the thrust bearing (FIG. 8). Carefully cut the transparent canopy free from formed sheet (FIG. 9). Scissors may be used if desired. Cement the cowl to nose of fuselage. Cement canopy to fuselage.
Lightly sandpaper the wing, stabilizer and rudder frames to remove excess balsa fuzz. Cover both sides of stabilizer and rudder with single pieces of tissue - also bottom of wing frames with single sections of tissue. Cover the top of wing frame is covered in two sections as shown above.
FIG. 7
FIG. 8
FIG. 9
EXPLODED VIEW OF FRAMES
Note: frames should be tissue covered before assembly.
Common Aircraft Terms
Building the DeHavilland Chipmunk
THUMB TACK