45
Step 35.
Once you are satisfied with the approximate position,
mark the servo location with a pencil. We made a template of the
servo to help establish the position where we would drill the holes
for the 1/4" wood dowels (provided) used to mount the servo.
Step 36.
Mark the location of the wood dowels using the tem-
plate (or servo) as a guide. For the JR 507 servo, the distance
between the dowel centers is 1
7
/
8
". We mounted the 1
1
/
2
" long
1/4" dowels to the servo before drilling the holes to mount the
servo. We also made an opening for the servo lead to pass into
the interior of the fuselage
Step 37.
Drill out the two holes for the dowels using a 1/4" drill
bit. Be sure to make a final check of the alignment of the servo
linkage to the carburetor before drilling. Use care not to drill too
far and into the fuel tank.
Step 38.
Make a small cardboard spacer for the servo from a
portion of the kit box. This spacer will be used to hold the servo
up about 1/16" from the plywood firewall while the epoxy cures.
Wrap a piece of wax paper around the spacer so it can be
removed once the epoxy cures. When these preparations are fin-
ished, mix up a small amount of 6-minute epoxy (approximately
1/4 ounce). Apply to the dowels and insert into the firewall,
making sure the spacer is in place so the servo is held approxi-
mately 1/16" off the surface. This is done to reduce any vibration
to the servo.
Step 39.
Allow the epoxy to cure completely before attempting
to connect the servo linkage to the carburetor throttle link
assembly. The linkages are set up so that when the servo is at
neutral (with carburetor at 1/2 open) both servo arms are
straight down forming the same angle. Refer to the photo below.
You will need to make mechanical adjustments to fine tune the
throw of the linkages. Each installation is unique to some extent,
however it is important to check for clearances, and that each
arm moves the same amount so that differential is not a concern.
template
Section 15: Installing the Control Linkages
CONTINUED