Cooling Flashcards
Excessive heat is undesirable for what 3 reasons?
- Affects the behavior of combustion of air/fuel charge
2.Weakens and shortens the life of engine parts
3.Impairs lubrication
What can happen with preheated fuel/air mixture? (Engine temp too high)
It will cause pre-ignition and detonation
What can you do to allow cooling of cylinders if the engine becomes too hot during taxiing or improper run up?
Idle the engine
Typically about half of the heat goes out the exhaust. The rest is absorbed by what?
The engine i.e. oil and cooling fins
What are the two types of temperature indicating probes?
Bayonet
Gasket
Piston cooling is done by either ______ or ______
Oil spray or splash
Greatest cooling fin area is on the _____ side of the cylinder
Exhaust
What are baffles used for?
To direct air close around the cylinder to aid in cooling and prevent hot spots
What are blast tubes?
Direct air to other components
Some aircraft will control cooling by the use of ______ flaps.
Cowl
Cowl flaps are controlled by one of three ways:
Electric
Hydraulic
Manual
How do helicopters facilitate cooling?
An engine-driven fan
What are augmentors (when not talking about boobs)?
Use exhaust gas velocity to ensure airflow over the engine for cooling
Liquid cooling uses a mixture of _____ and _____.
Ethylene glycol and water
What cooling system do Rotax engines use?
Hybrid (liquid and air)
