Os-engines FT-300 Gemini Manual de usuario descargar pdf (Pagina 17)

INSTRUCTIONS FOB O.S. FT-160 (GEMINI-160)

TWIN-CYLINDER FOUR STROKE ENGINE

IMPORTANT: Before attempting to operate your engine,

please read through this instruction sheet, as well as the

GEMINI SERIES Owner's Instruction Manual supplied, so

as to familiarize yourself with the controls and other fea-

tures of the engine. Also, pay careful attention to the

recommendations contained in the "Safety Instructions and

Warnings" leaflet also enclosed.

The O.S. FT-160 (Gemini-160) is a horizontally-opposed

twin-cylinder overhead-valve four-stroke-cycle engine of

26.5cc (1.62cu.in) displacement. It has the same external

dimensions and appearance as the FT-120-11 (Gemini-11)

but, whereas the Gemini-11 is restricted to 19.9cc (1.21

cu.in) to bring it within the 20cc displacement limit for

FAI Class F4C R/C Scale events, the Gemini-160 takes

advantage of slightly bigger cylinders, providing more

power for non-restricted events, or for sport flying.

Like the Gemini-ll, the Gemini-160 is a very refined engine.

The horizontally-opposed layout, typical of modern light

aircraft engine design, provides very smooth running

qualities and docile, trouble-free handling characteristics.

Production of the Gemini-160 and the Gemini-ll —as with

their big brothers, the 40cc Super-Gemini and the 49cc

Super-Gemini-300 — was preceded by an exhaustive pro-

gramme of research and prototype testing. These engines

are, needless to say, built to the outstandingly high engi-

neering standards for which O.S. engines are famous word-

wide.

SPECIFICATIONS

Displacement

Bore

Stroke

Practical R.P.M.

Weight

13.26c.c.X2(0.809cu.in.X2)

27.7mm (1.091 in.)

22.0mm (0.866in.)

2.000-10.000

1,100gr. (38.8oz.)

TOOLS AND ACCESSORIES

The following tools and accessories are supplied with your

Gemini 160.

1. Radial Motor Mount Set:

Radial Motor Mount

..................

Mount Fixing

Screws

(M5

25)

............

Lock

Washers

(05)

....................

Blind

Nuts (M5)

......................

Engine

Fixing

Screws (M4

22)

............

2. Set

of leads for wiring glowplugs

Leads

for glowplug with clip

..............

Lead for earth (ground)

.................

3. Valve Adjusting Tool Kit

0.04mm...............................

0.10 mm ......................... . . 1

Hexagonal

(Alien) key

(1.5

mm)

..........

Wrench (5

mm)

..................... . . 1

Needle-valve

extension

cable

............... 1

5. Knob for needle-valve extension (with set-screw) .. 1

Hook for

needle-valve

extension

............. 1

Choke

valve

rod

......................1

Woodruff

key

(spare)

...................1

9. Scale Propeller Washer Set

Propeller

washer

....................

Propeller nut ....................... 1

Screws to prevent propeller slippage (M3 x 32) ... 4

10.

Hexagonal (Alien) key

(2.0

mm)

............

11.

Hexagonal (Alien) key

(2.5mm)

............

12.

Hexagonal

(Allen)

key

(3.0mm)

............

13.

Wrench

(5-6

mm)

.....................

14.

Wrench

(7-8

mm)

.....................

15.

Wrench

(10-12

mm)

....................

16.

Wrench

(14-17

mm)

....................

FUEL TANK

The suggested fuel tank size is 400 cc or 14 oz. This will

give approximately 10 minutes running time at full power,

or about 13-15 minutes when some part-throttle operation

is included. Fuel consumption also depends, of course, on

the size of propeller used.

PROPELLER

The choice of propeller depends on the weight of the model

and on the type of flying envisaged. Determine the best size

and type after practical experiment. As starting points, sug-

gested propel lers are 15 X 8, 16 X 6-8, 18 X 6-8 and 20 X 6.

If the Safety Propeller Locknut Assembly is used, instal-

lation procedure is as follows.

1) Ream the propeller center hole to 12 mm (0.472").

Make sure that the propeller is properly balanced.

2) Fit the propeller sleeve-nut and washer to propeller,

screw onto shaft and tighten firmly with 17 mm wrench

supplied.

Please refer to 'PROPELLER' section of GEMINI

SERIES Owner's Instruction Manual. If the dimension

"T" is between 14.5 mm and 18 mm (or 0.571" and

0.709"), add locknut spacer supplied as shown in Fig. 4.

If the dimension "T" is between 18 mm and 22-5 mm

(or 0.709" and 0.886"), it is not necessary to add the

spacer.

3) Finally, insert the Safety Propeller Locknut. Tighten

Locknut firmly (but not with excessive force) using

14 mm wrench.

CARBURETTOR ADJUSTMENT

The carburettor of your Gemini 160 has been factory set

for the approximate best result, but the setting may. in

some cases, vary slightly in accordance with fuel and cli-

matic conditions.

Remember, also, that, while the engine is being run-in and

the needle-valve is set on the rich side, the carburettor can-

not be expected to show its best response. Therefore, it is

recommended that you first run the engine with the throttle

settings as received. If, however, the desired throttle res-

ponse is not obtained after the completion of the running-

in period, the carburettor should be re-adjusted as follows.

Note:

Idling speed adjustments should be carried out with the fuel

tank not more than half-full and with the battery disconnected

from the glowplugs.

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