O.S. Engines 91SZ-H - Manual (Page 6)

10
Items necessary for starting
Tools, accessories, etc.The following items are
necessary for operating the engine.
BEFORE STARTING
Glow Plug
O.S. No.8 is supplied with the engine.
Battery leads
Glowplug battery
The power source for heating the glowplug may be
either a large heavy-duty 1.5volt dry cell, Ni-cd battery
or glowplug Igniter.
1.5 volt dry cell
These are used to conduct current
from the battery to the glowplug.
Basically, two leads, with clips, are
required, but, for greater conve-
nience, twin leads with special
glowplug connectors, as shown on
the right, are commercially available.
Battery leads
glowplug Igniter
Make sure glowplug element
glows bright red inside room
or shadow.
Battery leads
In case of 1.5volt dry cell
12V Battery
Starter
Electric starter and starter
battery
An electric starter is recom-
mended for starting.
Hexagon starting shaft
This shaft mounted on an
electric starting motor is driven
into the shaft cup to turn the
engine.
11
Select, by practical tests, the most suitable fuel from
among the best quality fuels available in your country
for helicopter use. For the best throttle response, a
fuel containing 10% to 30% nitromethane is
preferable. Lubricants may be either castor-oil or a
suitable synthetic oil (or . a blend of both) provided
that they are always of top quality. For consistent
performance and long engine life, it is essential to use
fuel containing AT LEAST 18%
lubricant by volume. Some fuels
containing coloring additives tend to
deterriorate and may adversely affect
running qualities. If in doubt compare
to a fuel known to be good.
Model engine fuel is poisonous. Do not allow
it to come into contact with the eyes or
mouth. Always store it in a clearly marked
container and out of the reach of children.
Reminder!
Fuel
Model engine fuel is also highly flammable.
Keep it away from open flame, excessive
heat, sources of sparks, or anything else
which might ignite it. Do not smoke, or allow
anyone else to smoke, near to it.
Alternatively, one of the purpose-
made manual or electric fuel pumps
may be used to transfer fuel directly
from your fuel container to the fuel
tank.
Manual
Electric
Install a filter to the outlet tube of your
refueling container to prevent entry of
foreign matter into fuel tank. O.S. ‘Super
Filters’ (large and small) are available as
optional extras.
O.S. Super Filter (Fuel Can Filter)
It is recommended to install a good in-
line filter between the fuel tank and
carburetor to prevent entry of foreign
matter into the carburetor.
Fuel Filter
Heatproof silicone tubing of approx.
5mm o.d. and 2.5mm i.d. is required
for the connection between the fuel
tank and engine.
Fuel Pump
Silicone Fuel Line