The control lines attach directly to the bellcrank, eliminating leadouts and line clips. The screw-on
buttons are made from blind nuts.
Fuel shutoffs don’t need to be mysterious or complicated.
Down-elevator trips the shutoff, pinching the fuel line against
the fuselage. Notice the tidy bellcrank installation.
create a blind nut with a hex flange
that can be tightened with a 1/4-inch
nut driver. Repeat three more times.
You never know when you might
lose one and need a spare.
The lines should swivel freely
when the blind nuts are tightened
down over them. If necessary, lightly
compress the thickness of the
eyelets by tightening them between
two nuts on a 6-32 bolt.
The pushrod is made from a piece
of 1/16-inch music wire with a Z-bend
at each end. If you are uncomfortable
with your ability to accurately bend
the pushrod, you can use a 2-56
threaded pushrod with an adjustable
clevis on the elevator.
Before installing the pushrod, attach
the unfinished shutoff cable with a fine wire wrap and solder.
The pushrod is installed in the inner hole in the bellcrank, and
the topmost hole on the control horn. Install the bellcrank with
a washer or two between it and the wing to allow clearance
for the pushrod. Make sure there is adequate clearance for the
bellcrank buttons so they don’t bind on the fuselage.
Install the elevator control horn and attach the pushrod. Test
the controls for smooth operation and approximately equal
amounts of up and down. When satisfied, install the cotter pin
Solder the two small washers onto the shutoff trigger wire
(if not already done). Slide a leadout crimp sleeve and a 1/2-
MJ 5 Model Aviation JUNE 2015 www.ModelAviation.com