Presentation on theme: "9.01 Four Stroke Cycle and Engine Types References: FTGU pages 51-53"— Presentation transcript:
1 9.01 Four Stroke Cycle and Engine Types References: FTGU pages 51-53 Aero Engines9.01 Four Stroke Cycle and Engine TypesReferences:FTGU pages 51-53
2 9.01 Four Stroke Cycle and Engine Types MTPs:Parts of the Cylinder4 Stroke CycleTypes of Combustion Engines
3 Parts of the Cylinder Piston: moves up and down Bore: hole for piston Spark Plug(s): ignites fuelValves: intake and exhaustPiston Rod: moves crankshaftCrank Shaft: rotates propSump: contains oil at bottomCam: opens / closes valves
5 Induction (Suck) Cam pushes down Intake Valve Piston forced down by moving CrankshaftDown-moving piston sucks air/fuel mixture through intake valveCamCam
6 Compression (Squeeze) Both valves closedPiston forced upwards by moving crankshaftUp-moving piston compresses air/fuel mixture
7 Power (Bang) Both valves closed Spark plug ignites fuel air mixture Piston forced down by expanding gassesDown-moving piston pushes connecting rod which rotates crankshaft
8 Exhaust (Blow) Cam pushes exhaust valve open Piston forced upwards by moving crankshaftUp-moving piston pushes exhaust gasses out
9 ConfirmationMatch the parts of a reciprocating engine by matching their names with the letter.Cylinder ____Crankshaft ____Intake valve ____Piston ____Sparkplug ____Connecting rod ____Exhaust valve ____
10 ConfirmationMatch the actions of a four-stroke cycle by matching the action with the engine diagram.Compression ____Exhaust ____Intake ____Power ____
12 Horizontally OpposedTwo banks of cylinders on opposite sides of a centrally located crankcase.Flat design fits inside aircraft nose well.Common in Cessna aircraft
13 RadialOdd number of cylinders (5, 7, 9…) surrounding a centrally located crankshaft.Single or multiple banks of engines may be used (stacked behind one another).Cylinders fire opposite each other to reduce vibrations.Poor shape increases parasite drag and reduces forward visibility.
14 InlineCylinders lined up behind each other, typically underneath crankshaft (aka inverted inline).Advantage: small frontal cross section (streamlined aircraft nose)Disadvantage: poor air cooling and long, heavy crankshaft.
15 Confirmation Match the engines with the correct engine type: A – Horizontally opposed engineB – Radial engineC – In line engine