Os-engines 61RX-H WC Manuel d'utilisateur télécharger pdf (Page 14)

The Medium Speed Needle Valve

This is an extra control that can be brought into

play, if necessary, after adjusting A and B above. It

provides the means of fine-tuning mixture strength

over that all-important part of a helicopter's throttle

range where the model is flying in, or near, the

hovering mode.

STARTING

Open

Be sure to use a muffler pressurized fuel feed. Use

the same fuel as you intend to employ for actual

operation of your model.

Opening and closing of the Needle-Valve

Turn the needle clockwise to

close the needle-valve, and turn

the needle counter-clockwise to

open the needle-valve as shown

in the sketch.

High Speed needle-valve:

exactly two turns open from the fully closed

position.(Note: If a different muffler is used, this

setting may require readjustment)

Idle Mixture Control Screw:

exactly two turns open from the fully closed

position.

exactly one turns open from the fully closed

position.

Medium Speed needle-valve:

Idle MIxture Control Screw

High Speed Needle Valve

(Main Needle)

Medium Speed Needle Valve

HEX KEY NEEDLE ADJUSTMENT

The knurled heads of the two needle valves (High-Speed

and Medium Speed) are provided with diagonal slots for

use with a screwdriver. Alternatively, formore positive

location via an Allen hexagonal key, these heads also

have M2.6 internal threads, into which M2.6x5mm Allen

cap-head screw may be fitted. To avoid risk of damage

to the fuel passages when tightening these screws,

remove the needle valves from the carburetor and use

'Loctite' thread-lock compound to secure the screw.

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Os-engines 61RX-H WC Manuel d'utilisateur Page 14