Dimension A . 12mm.
Dimension B 2 to 3mm (offset to the right)
General Layout. Fuel tank could also
be fitted in front of the engine
.
.
click the pic for a closeup
Sparkplug to transom
with Zenoah 430mm to 460mm ( transom is the vertical part of the
back of the boat.). The front part of the deck opening should be
cut away to give good access to the pull start handle.Remove the
pullstart from the motor and remove the 3 countersunk screws which
fix the big aluminium plate to the motor. The screws may be
tough to remove. Take out both screws from the red coil and
loosely fit the coil relocator using the same screws. Turn the
flywheel until the magnets are on the opposite side to the coil (
magnets are the shiny metal parts on the outside of the flywheel).
Push the coil away from the flywheel and put a piece of thin card
between the coil and flwheel. Press down on the red coil and
tighten the 2 screws and then remove the cardboard. This will set
the correct airgap between the coil and flywheel. Fix the motor
mount brackets to the engine and fit the throttle bellcrank and/or
bracket to the front of the motor as shown in the pictures.
Fit the pullstart using the M4 screws in the motor mount kit.
Before fitting the pullstart make sure the screws do not bottom
out. If they do then use some shorter screws or washers under the
heads of the bolts. Bolt the rubbers to the brackets using the
nuts and washers provided. The motor mount and rubbers will then
fit between the wooden rails. Fit the coupling to the motor.
The strut and rudder should now be mounted on
the transom of the boat in the position shown in the drawing and
picture.
Drill a hole for the proptube in the ‘V’ of the transom and
elongate it upwards with a file so that the strut height can be
varied. After first tests to find the best strut height/propeller
the tube exit through the transom can be with silicone
sealer although many people leave this hole open. Fit the
tube is the next job . The tube should run along inside the bottom
of the boat and it should make a gentle curve up to the
motor. The tube will bend without kinking if bent carefully.
Cut the prop tube to length so that it is about 10 to 15mm from
the coupling but pushed into the strut as far as possible. Fit the coupling to the motor and then bolt the engine mount to
the wooden rails. The Strut MUST be fitted at the
position shown in the pics above.. Check the drawing above for the
position of the tube through the transom. Fit the strut assembly to the transom using the four M4 screws
provided and then temporarily remove it. Reinforce the
inside of transom if required with
a plywood plate or fibreglass mat and resin. Put a shallow bend in
the stuffing tube ( brass tube) near the engine so that the tube
lines up with the coupling and then lies in the bottom of the boat
all the way to the transom and through the hole in the transom.. The flexi shaft can be passed up through the tube so
as to slide smoothly into the coupling to check alignment. The
short piece of tube in with the T bar can be slipped over the end
of the tube nearest the engine leaving about 10mm of the inner
brass tube showing through. The T bar should be fixed onto this
tube and then the whole tube assembly with T bar positioned
between the rails with the correct gap between coupling and end of
tube. Mark the rails at each side of the T bar and drill
through for the T bar mounting screws.
Cut the prop tube to length so that it slides into the back of the
strut. At this point the strut and T bar can be bolted in
Position. The rudder can be fixed to the transom with the
bracket as close as possible to the strut bracket. Cut the flexi to length, remembering to leave a gap
of 5 to 6mm (not less than 5mm) between thrust washer and the
strut. Do not cut the flexi too short, because it has to go inside
the coupling. The fuel tank can be fitted in front of or behind
and to the right side the engine. Hold the tank in place with
rubber bands through hooks fitted to 2 strips of 3/8" wood
glued to the hull. The inside of the deck hatch opening in the
deck should be cut back until the hatch fits into it. Fix the
hatch down using GA8 hatch fasteners or similar at the rear. At
the front, glue to rods or a plate onto the underside of the hatch
to locate under the front edge of the hatch opening. . The radio box can be
fibreglassed in place. Only use balanced / sharpened propellers.
We recommend Octura props. The lower fuel nipple on the carb
is connected using the tygon (yellow) tubing to the fuel tank feed
pipe. The nipple on top of the carb is an overflow pipe for
excess fuel from the primer bulb.
For Zenoahs and other petrol
engines use 1/4" flexi with 1/4" stubshaft.
There are many pictures of a boat
build on the Sigma instructions in the technical section of this
website. They will help with other aspects of building the Miami.
WE SHIP WORLDWIDE
email here Phone. UK
07842 634090 international 00447842 634090.
PMB, 4, Harvey Court,
Harvey Lane, Golborne, Cheshire, WA33RX England.
Model boats of all types including FSRV, FSRH, FSRO Offshore,
Deepvee,
fast electric, cats, zenoah gas boats.
Copyright Dave Marles
Copyright Dave Marles