How does carb heat work
When you turn carb heat on, air is routed around exhaust pipe causing temp of fuel/ air mixture to warm up and not have carb ice. The trade off is drop in RPM because warm air is less dense which means decreased engine performance
What temperature is most common for carb ice
20 to 70 degrees F and high humidity. High humidity means more water vapor available to freeze and cause carb ice
Why does carb ice happen
The temperature of air/ fuel mixture decreases significantly when pressure is low and it’s sucked through narrow passage way called a Venturi
Explain how a battery and alternator work
The alternator is engine driven, and gives the battery continuous power. Without the alternator battery would die. Battery powers the electrical system in which powers things like lights, flaps, radios
What is the 4 stroke cycle of and engine
Suck, squeeze, bang, blow
Intake, compression, power and exhaust
Explain the 4 cycles
Suck is when the fuel / air mixture is pulled into cylinder. Squeeze is pushing everything together into small area. Bang is when spark plug engines mixture. Blow is exhaust
How does the propeller turn
All 4 cylinders are in different cycle moving the crank shaft which moves propeller
What is a cam shaft
Above crank shaft, opens and closes the spring valves to allow air
What does throttle control
Amount of fuel/air mixture that goes into the cylinder
What is mixture
How much fuel is mixed with air. So the fuel to air ratio
How does air get into the engine
Air intake usually on front of aircraft then sent to cylinders
How does fuel get into engine
Fuel is typically gravity fed form into cylinder
How does fuel injection engines work
Fuel pump sends fuel from tank to unit, unit regulates fuel needed for throttle setting, then sent to cylinders
How does a carburetor work
Fuel sits in tank, air is sent through Venturi pulling fuel from the tank from pressure differential. Throttle valve at top controls how much of that mixture is let out
Explain a magneto
A rotating magnet that creates sparks of electricity
Are the magnetos on aircraft’s electrical system
No, independent.
When magneto creates electricity where does it go
Sent to the spark plug ok the cylinder
How many magnetos are there
Two
How many spark plugs per cylinder
2 per cylinder
What does the ignition switch do
Power the magnetos
How do we cool engines
Oil and air
How does oil help the engine
Lubricates and cools. Oil passes through oil cooler which gets sent to engine, cools it off and warm oil returns to oil filter and cooler to restart process
How does the exhaust system work
Allows unwanted exhaust gases to leave engine and also provides cabin heat
What fuel do aircraft’s typically take
100 low led (blue)
