Section 9: Control Surface Hinging - Model Tech Magic Formula 3D ARF Manual

IMPORTANT Before the epoxy sets up, use a builder's triangle to make sure that the vertical stabilizer is perpendicular to the
horizontal stabilizer.

SECTION 9: CONTROL SURFACE HINGING

(17) C/A-Style Hinges
Kwik Bond Thin C/A
Kwik Bond C/A Debonder
Excel Modeling Knife
Ernst Airplane Stand
STEP 1: HINGING THE AILERONS
Important Information About the C/A-Style Hinges Included with Your Magic Formula 3D ARF
The hinges are NOT glued into place at the factory, they are simply slid into place dry for shipping purposes. You must glue them
into place.
The Magic Formula 3D ARF uses C/A-style hinges to hinge the control surfaces. These hinges are designed to be glued into
place using thin C/A. Do not glue these hinges into place using any other type of glue, such as thick C/A or epoxy. Use of any
adhesive other than thin C/A could result in failure of the hinges during flight.
For flutter-free control surfaces and crisp control response, it is imperative that the hinges be glued in properly. This is achieved
by having a tight hinge gap (no more than 1/32" wide) and using plenty of thin C/A glue. Poor hinge installation can lead to control
surface flutter which can result in a catastrophic failure of the airframe.
If the hinge(s) can't be pushed in far enough to achieve the proper hinge gap, you'll need to use a modeling knife with a # 11 blade
to cut the hinge slot(s) deeper.
checking all of your measurements once more before the epoxy sets
up. Quickly remove the excess epoxy, and use pieces of masking tape
to hold the vertical stabilizer in place, until the epoxy has fully cured.
YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT:
YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES:
as shown.
hinge line while you are hinging the aileron.
Push the vertical stabilizer down into place and realign it, double-
Dubro T-Pins
Masking Tape
Paper Towels
Push two T-Pins through the center of four C/A-style aileron hinges,
The T-Pins will keep the hinges centered and square to the
17 Continued On Next Page