FB Jets Dolphin S Manual - page 27
FB Jets Dolphin
27
Step 10: Horizontal Stabilizer and Elevator servo installation
The horizontal stabilizers are supplied in two halves; they do not have the servo arm slots
precut from the factory.
The servo is installed in the horizontal stab with the spline of the elevator servo facing
towards the fuselage and closest to the trailing edge, see figure 5.
Cut the slot in the stabilizer as shown in the photo, if using Hi-Tec servos you can utilize the
slot cut out Template from Annex A of this manual, if using other servo brands you might
have to shift the template slightly based on the height of the servo arm from the mounting
tabs.
Note: the template was developed based on not using the rubber grommets supplied with
the servo. It is not recommended to use grommets for servo mounting into jet airframes as
vibrations typically associated with reciprocating power plants are not an issue.
Slot cut out template
Cut the control horn slot in the elevator using the same slot cut out Template from the
above step.
After slotting the elevator to accept the fiberglass control horn, the horn should be glued in
with Hysol, before doing so make sure to use medium grit sand paper or a Dremel tool to
roughen up the area on the horn where the adhesive will make contact.
A uniform adhesive fillet should be created around the control horn and the control surface.
It is helpful to use masking tape around the periphery of the control horn slot. Any extra
adhesive should be removed. Let the control horn adhesive setup undisturbed before
proceeding.
Using a receiver or servo driver, find servo neutral and attach a suitable single sided servo
arm perpendicular to the servo making sure to tighten the servo arm screw.
Use sheet metal type servo screws to mount the servo, after installing the screws, remove
them and apply a drop of thin CA to each of the holes to reinforce them, reinstall screws
after the CA sets up.
Assemble the elevator linkage; the linkage should measure 3.2
” (81 mm) in length from
center to center of the ball link and clevis.
The clevis should be connected to the hole in the horn that is ¾” (19 mm) from center of the
spline. Make sure to use keepers on the clevis. If using the ball link on the control horn
end, make sure to use the ny-lok type nut on the bolt.
Note: you may need to enlarge the hole in the control horn with a
.118” (3 mm) drill for the
connecting bolt, do not oversize the hole as this will lead to linkage slop. Do not over
tighten this bolt as it could cause linkage binding.
Trial fit the horizontal stabilizers to the fuselage; see photo xx, checking the fit of the
securement bolt.
Check operation of the elevators to make sure that there is no binding.