ALATUS-M – Owner’s Manual
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4. SUMMARY DESCRIPTION OF DESIGN AND SYSTEMS
4.1. CONTROL SYSTEMS
The control system of powered sailplane consists of the joy stick, adjustable pedals according to pilot's
height, combined push-pull/cable control systems (links, cables etc.), rudder, elevator and ailerons. The
control of the adjustable pedal (blue) is on the central panel more to the right. Near the control stick (at left
below) a trimmer spring is located. Moving it forward increases a balancing speed, backwards reduces.
The flap lever is located on the cabin wall to the left it has two fixed positions:
#1 removed flaps (flap angle - 00). The flap lever is in fixed position PUSH TO STOP;
#2 extended flaps (flap angle - 200). A flap lever is in fixed take-off position. The further flaps
extending (PULL TO STOP up to 700) needs for growing a gliding angle at level landing.
4.2. POWER-PLANT
The retractable power-plant into the rear fuselage cover (engine bay) includes each component that the
engine with ribbed belt reducer, pulling propeller and exhaust system which installed on the carbon
column.
The engine carbon column are fastened by means of the rubber shock absorbers to the lower carbon
engine mount which activated by a linear actuator. In whole with the fuel tank and engine controls are
assembled on a welded frame.
An engine ignition system, fuil system, decomressor and the prop locking device are related to a power-
plant functionally which allow to fix the propeller in vertical position during retracting.
4.2.1. CORS-AIR M25Y (BLAK DEVIL) is petrolic, two-strokes, one-cylinder and air cooling
engine with the petal-type inlet valve, carburetor mixture formation, with the unduplicated electronic
ignition system which is equipped by resonance exhaust system.
An engine control is occurred by
1) the throttle lever with pilot's left hand it position PULL TO STOP is idle and it position PUSH TO
STOP is take-off. Moving the throttle lever changes of a butterfly position by means of the cable;
2) the switches on the control panel. The engine control panel is located on the left wall of the cockpit.
There is Master Switch, Ignition Switch, button of START, Retraction/Extension 3-position Switch and
Position Indicators (green and red) on the control panel.
Engine is started by means of the Ignition Switch and button of START.
Engine is stopped by means of Ignition Switch ONLY.
The linear actuator is driven by Retraction/Extension 3-position marked Switch. Green Position
Indicator lights in extension position; red indicator does in retraction position or in-between position.
The engine starting has been blocked when the engine does not retract out of the engine bay fully or
propeller is locked.
Before retracting the engine into the engine bay the propeller should be fixed exactly in vertical position
provided by the prop stop locking device. The propeller is turned over by hand on the ground and by
airflow in the flight until stopped. There is a decompressor for the propeller autorotation.
Locking of the prop locking device and opening of the decompressor valve are carried out by the
control levers located on the cockpit wall to the right. Both of the control levers are united while the
propeller locking the decompressor valve opens automatically.
4.2.2. The fuel system consists of a fuel tank, a filter, lines and fittings. There is a fuel nipple, fuil
quantity indicator and tank filler on the fuil tank.
Unusable fuel is 0,1 liter.
