Lesson 14: Engine Instruments Flashcards
Power created by a reciprocating engine is a product of what?
Manifold Absolute Pressure
RPM
How could power output be increased?
RPM constant
MP increase
A constant MP and increased RMP will result in what?
Increase power
In a PISTON engine, what type of power instrument do we use?
MAP in “Hg
An important indicator of the engine power is?
Induction Manifold’s absolute pressure
What is the maximum difference between manifold pressure and atmospheric pressure?
Is at IDLE
What type of instrument do we use for our TURBINE engine?
EPR (Engine Pressure Ratio)
not direct measurement
Pt7 to inlet Pt2
EPR
What are the factors affecting EPR?
Pressure
Altitude
Speed
Temperature
Torque Indicator is used for what?
Turprop
Turboshaft
What is max power limited by in a torque indicator?
GEARBOX strength LOW altitudes
GAS temperature at HIGH altitudes
Sun crankshaft converted into?
Torque Reading
PISTON tachometer is what type of RPM?
DIRECT rpm
TURBINE tachometer is what type of RPM?
% RPM
What does the red line between the 2 parts of a green gauge mean?
PROHIBITED do not leave it there
4 types of Tachometers?
Mechanical
Magnetic
Electrical
Electronic
This type of tachometer is used on early aircraft, has a set of flyweights driven by flexible drive shafts from the engine
Mechanical Tachometer
This type of tachometer has a flexible driveshaft connected to a permanent magnet
Magnetic Tachometer
What is in a Electrical Tachometer?
Synchronous Motors
Drag Cup
In a 3 phase tachometer generator, what is important?
Frequency
How does an Electronic Tachometer work?
Measures PULSES by magnetic induction
Which instrument indicates the relative speed of the slave engine to the master?
SYNCHROSCOPE
Which controls the direction?
Current from the faster engine
