VT80BL Instruction Manual
Page 6
JETS MUNT S.L
Engine Description
The engine is a turbojet of a single shaft design specifically designed to power RC aircraft.
The engine starts automatically thanks to an installed electric starter situated in the front.
The starting sequence is controlled by an electronic unit that initiates the starting
sequence and controls the parameters of the engine within the design limits.
The engine uses a system of direct liquid preheating, ignited by a long life ceramic glow
plug
situated inside the engine. After the initial preheat the liquid fuel is gradually introduced.
The fuel should contain a small percentage of oil and uses part of this fuel to lubricate its
two ceramic high speed bearings.
The fuel for the engine is provided from a fuel tank through a small electrical pump. The
engine speed between idle and maximum is controlled by varying the speed of the fuel pump
through an electronic controller called an ECU (electronic control unit), that is contained
inside the engine.
Installation Notes
1. The engine should be mounted using the strap mount supplied or an approved equivalent.
2. The signal cables from the engine must be carefully routed away from the engine intake
so there is no possibility of accidental ingestion of the wire.
3. Fuel pipe should be routed similarly clear of the intake.
4. The fuel pump should be preferably mounted with the spindle in the vertical position with
the motor uppermost. In the event of any fuel seeping from the pump this will not pass
through the electric motor. Note the pump is supplied fitted with built in suppression filter
to reduce radio frequency noise.
5. The centre of the fuel tank should be mounted laterally, as near to the centre of gravity
(CofG) of the model as possible. This will minimize the CofG shift as the fuel is used during
flight.
6. Any air ducting to the inlet of the engine must have sufficient diameter of at least twice
of the engine intake diameter.
7. If an extended exhaust duct is required, it should be of sufficient diameter and strength
for optimum engine performance.
8. Extreme care should be exercised to ensure that no foreign object, loose parts of the
model or debris are allowed to enter the compartment where the engine is installed.
We recommend testing the engine on a test stand prior airframe installation.
You should have a clear idea of how to arrange the components needed to run the engine
inside the model. The main issue is the fuel tank, you will need to arrange the CofG in the
centre of the tank and adjust the receiver and ECU batteries to achieve the correct
location.
