Os-engines FT-300 Gemini Manual de usuario descargar pdf (Pagina 13)

RUNNING-IN ("Breaking-in")

For long life and peak performance,

please observe the

following running-in procedure:

Install the engine and fit the propeller that you propose to

use for flying your model. For example, if you use the pro-

peller indicated in the separate instructions sheet, start the

engine and run it for about 10 seconds with the needle-

valve

set

for

6,000/6,500

r.p.m.,

then open the

needle-

valve to reduce speed to approximately 4,000 r.p.m. and

run for 20 seconds at this cooler setting. Keep the throttle

fully open, using only the needle-valve to reduce speed.

Repeat this procedure, alternately running the engine fast

and slow with the needle-valve, but gradually extending the

short period of high

speed

running

until

total

of approxi-

matelylO minutes running time has been accumulated. For

those who do not have a tachometer, the exhaust gas

colour can be a help: i.e., as the needle-valve is screwed in,

the

dense

grey

exhaust smoke

will

become

less

visible.

Following the initial break-in of 10 minutes on the ground,

run-in for a further period in the air. For the first flights,

have the needle-valve set as rich as possible, consistent with

adequate take-off power and, if necessary, readjust the

throttle trim on the transmitter so that the engine does not

stop when the throttle is fully closed.

With

each

successive

flight,

the

needle-valve

slightly,

until,

at the end of 10 flights, the

needle-valve

set

for

maximum power. The carburettor can now be adjusted for

optimum throttle performance following the advice given in

the separate instructions sheet.

VALVE CLEARANCE ADJUSTMENT

Refer to the INSTRUCTIONS FOR USE OF VALVE

ADJUSTING TOOL KIT sheet contained in the Valve

Adjusting Tool Kit supplied with the engine.

EXHAUST PIPE ADJUSTMENT

The direction of the exhaust pipe may be altered in ac-

cordance with individual installation requirements. The

angle is easily adjusted by loosening the nut that secures the

exhaust pipe to the cylinder head. Use the appropriate

spanner supplied. If longer exhaust pipes are required

for the "Super-Gemini" 240/300 models, use the flexible

exhaust pipes of 12 cm, 17 cm, 24 cm or 33 cm length

which are available as optional extra parts.

LUBRICATION

All the parts of your engine are automatically lubricated by

the oil content of the fuel mixture. The crankcase breather

hole

in the

bottom

of the

timing

case

and

fitted

with

brass nipple. Fit a length of silicone tubing of approx.

2.5 — 3 mm I.D. to this nipple to conduct away the small

amount of oil that escapes through the breather, (see photo

2).

CARE OF YOUR "GEMINI SERIES" ENGINE

Your engine should be treated with the utmost care at all

times.

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Os-engines FT-300 Gemini Manual de usuario Pagina 13

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