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- Adjust the position of the motor so that the distance from
the motor mount to the front face of the glow motor's
propeller driver is dimension "M" + 5 mm - Fig. 55.
- Mark the position of the screw holes on the motor mounts,
working through the motor mounting lugs, and drill them
2.5 mm Ø - Fig. 56.
- Attach the motor to the mounts using 2.9 Ø x 15 mm self-
tapping screws. Fit two 3 / 6 mm Ø washers on the front
screws between motor mount and flange in order to obtain
the correct sidethrust - Figs. 57 and 58.
- Drill a 3.5 mm Ø hole for the throttle pushrod in line with the
carburettor throttle arm - Fig. 59.
- Fit the throttle pushrod guide sleeve in the hole and epoxy
it in place - Fig. 60.
- Screw a clevis on one end of the throttle pushrod (1.8 Ø x
approx. 360 mm) and slip it in the pushrod sleeve from the
front. Connect the clevis to the carburettor throttle arm;
depending on the type of motor you are fitting, you may
need to open up the hole in the throttle arm to 1.8 mm Ø
- Fig. 61.
Stage 6, the fueltank
- Fig. 62 shows the fueltank components.
- Place the cover plates on either side of the fueltank
stopper and fit the screw, but do not tighten it at this stage.
Fit the vent tubes as shown; the rear end of two tubes
should be bent upward so that they are located at the top
of the tank.
- Fit the fuel feed tube through the tank stopper.
- Push the silicone fuel feed line on the feed tube, cut it to a
length of about 85 mm and fit the clunk pick-up on the end
- Fig. 63.
- Push the tank stopper into the fueltank. Swivel the tank in
your hand to ensure that the clunk weight does not bind or
get stuck in the tank at any attitude. Shorten the fuel tube
if necessary, then tighten the stopper screw to seal the
neck.
- Cut three overlength pieces of silicone fuel tubing (about
200 mm long) and push them onto the tubes in the fueltank
stopper. Mark the feed line (clunk pick-up) with a piece of
coloured insulating tape - Fig. 64. Place the tank under
pressure to check that there are no leaks.
- Fit the fuel tubes through the large hole in the motor
bulkhead from the inside, and install the tank in the fueltank
compartment.
- Secure the fueltank by wedging pieces of foam round it
- Fig. 65 to 67.
- Screw the silencer to the motor. Connect the pressure line
to the silencer, and the marked fuel feed line to the carbu-
rettor feed nipple.
- Allow the third fuel line (filler) to hang down out of the
model. This tube must be sealed with an M3 screw before
each flight.
- Trim the two fueltank compartment cover plates to fit and
glue them in place - Figs. 68 and 69.
- Cut the openings in the cowl required to clear the silencer,
carburettor, needle valve and cylinder head. Cut the cooling
air openings - Figs. 70 and 71.
- Place the cowl on the model, and ensure that it does not
make contact with the motor or silencer at any point.
Enlarge the holes if required.
- Attach the cowl to the fuselage using five 2.2 Ø x 5.5 mm
self-tapping screws - Fig. 72.
All manuals and user guides at all-guides.com
Assembly and operating instructions
Pitts S 1 ARF
10
Stage 7, installing the electric motor
- Mark the position of the large slot in the nose bulkhead and
cut it out as shown in Fig. E 1.
- Cut the parts for the motor mount ring from 3 mm plywood
and glue them together. These parts are shown full-size in
the drawings "S1" and "S2" - Figs. E 2 and E 3.
- Sand the outer ring at an angle as shown, in order to obtain
the correct sidethrust - Fig. 4: a > b. The starting point for
dimension "b" should be about 6 mm.
- Drill eight 2.2 mm Ø holes round the periphery of the cowl,
as shown in the sketch "S3". Carefully countersink the holes
from the front by hand. Cut the holes required in the cowl
- Figs. E 5 and E 6.
- Place the ring in the cowl and position it carefully:
the bevelled side (b) must be on the left, as seen from the
tail. Mark the position of two opposed holes on the ring, drill
1.5 mm Ø pilot-holes at the marked points and temporarily
attach the ring to the cowl using two 2.2 Ø x 10 mm screws.
- Mark and drill the remaining holes and attach the ring to the
cowl - Fig. E 7.
- Connect the motor and controller as described in the
instructions supplied with both units (matching connector
system), and program the speed controller ready to use.
- Screw the electric motor to the motor mount ring - Fig. E 8.
- Place the cowl on the model, at the same time feeding the
speed controller and cables back through the large slot in
the motor bulkhead - Fig. E 9.
- Mark the position of the cowl mounting blocks on the
fuselage - see Fig. E 10.
- Position the cowl on the fuselage and tape it in place.
- Drill holes at the marked points. Open up the holes in the
cowl to 2.5 mm Ø, and fix the cowl to the fuselage using five
2.2 Ø x 5.5 mm self-tapping screws.
- Fit the propeller driver on the motor output shaft - Fig. E 11.
The flight battery
- The battery arrangement described here has been tested in
conjunction with the recommended electric motor and
found to work well: the cells are wired in parallel in sets of
three, then three of these "three-packs" are wired in series:
see wiring diagram E 12 and Figs. E 13 and E 14. Attach the
appropriate connectors to the battery pack.
- Conductor cross-section: min. 2 mm
- The speed controller and the prepared flight pack are
secured in the fuselage using Velcro (hook-and-loop) tape:
apply strips of tape to the battery and controller, and apply
the mating strips in the appropriate positions in the
fuselage - Fig. E 15.
- Attach the speed controller and flight pack to the fuselage
- Figs. E 16 and E 17.
Notes on the battery cells:
Before you wire the cells in series and parallel as described, it
is essential to read the battery manufacturer's instructions and
safety notes, as supplied with the cells. This also applies to
charging and using the cells.
Motor downthrust and sidethrust
- If flight-testing shows the need for an alteration to the
motor's downthrust or sidethrust, follow this procedure:
remove the motor. You can now increase or reduce the
downthrust and / or sidethrust by adjusting the taper of the
motor mount ring - Fig. E 18.
No.
3049
2
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