O.S. Engines 70SZ-H - Manual (Page 6)

10
BEFORE STARTING
Tools, accessories, etc.
The following items are necessary for operating the
engine.
1 Fuel
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!
4 Glowplug battery
The power source for heating the glowplug may be
either a large heavy-duty 1.5volt dry cell, Ni-cd battery
or battery integrated booster.
1.5 volt dry cell
2 Glowplug
O.S. No.8 glowplug is installed in the engine.
3 Battery leads
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.
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.
Battery Integrated booster
Battery leads
11
Make sure glowplug element
glows bright red inside room
or shadow.
Battery leads
10 Plug wrench
Used for tightening glowplug. The
O.S. long plug wrench is available
as an optional accessory.
7 Fuel pump
For filling the fuel tank 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.
For tightening
glowplug
Manual
Electric
Fuel pumps
Fuel Can Filter
12V Battery
Starter
8 Fuel container filter
Install a filter on the outlet tube of your
refuelling container to prevent entry of
foreign matter into the fuel tank
9 Silicone tubing
This is required for the connection
between the fuel tank and engine.
Silicone tubing
6 Electric starter and starter
battery
An electric starter is recom-
mended for starting.
5 Hexagon starting shaft
This shaft mounted on an
electric starting motor is driven
into the shaft cup to turn the
engine.
In case of 1.5volt dry cell