Carf-Models Ultra Flash Instruction Manual page 11

stab, and sand the edges a little if necessary
for a perfect fit. Glue the milled 1.5mm ply-
wood triangles under each corner of the servo
bay (where the fixing screws will be) to rein-
force the area, using thick CA. Sand and trim
the inside edges of the servo bays to reduce
the width of the lips between each corner to
about 1.5 - 2mm wide. (photo right)
Fit the rubber grommets and brass eyelets
into the servos, and loosely bolt them to the
angles with the M3 x 10 allen bolts and wash-
ers (with the servo output shafts towards the
back). Using the M3 x 6 button-head bolts secure the ali.
brackets to the hatches, with a small drop of Loctite on
each. The milled holes in the hatch are 2.5mm diameter,
and the bolts will cut their own thread in the composite ply-
wood. Check that the upper face of the servos is complete-
ly flush against the inside of the servo hatches, and then
tighten the securing allen bolts.
Centre both servos with your R/C, and fit a heavy-duty
plastic servo arms, using a drop of Loctite on the servo
arm bolts for safety. Drill two 9mm Ø holes for the supplied
plastic grommets, in the position shown in the photo,
thread the servo cables through and fit the grommets in
place. We recommend that you protect the servo cables
with a short length of spiral-wrap, or similar, just in case
you have a turbine 'wet-start', as they are quite close to
the thrust tube. With the servo hatches in place, drill
Ø2mm through the fixing holes in each corner, and secure
the hatches with the Ø 2.9 x 10mm sheetmetal screws.
Make up the linkages from the 45mm long M3 all-threaded
rod provided, with an M3 steel clevise and M3 nut to con-
nect to the outer hole of the HD servo arm and an M3 ball-
link bolted between the dual phenolic elevator horns with
an M3 x 16mm bolt and M3 lock nut.
Check the servo centering again with your R/C system, as
it's more tricky to adjust the linkages after the linkage cov-
ers are glued in place. When satisfied, trim and sand the
painted stab linkage covers, and glue onto the stab hatch
with a couple of drops of thick CA. See photo P1.
Fit the completed stabiliser, making sure that there are M4
washers under the heads of the M4 x 30mm steel bolts.
The stab has a chamfer on the upper back edge, so that
you can fit and remove it easily without having to remove,
or loosen, the exhaust nozzle.
We recommend that you protect the elevator servo exten-
sion leads inside the fuselage with aluminium tape (includ-
(above) Glue 1.5mm ply reinforce-
ments under corners. Trim the lips
around the edge of the servo bays
to 2mm wide. Note position of
grommets for servo cables.
(below) Stabs servos are mounted
to hatches on aluminium angles.
Chamfer corners if needed for fit.
(below) Protect servo cables with
the supplied aluminium tape.
9