Rotary Wing - Week 1

what is a powertrain

grouping of components in a vehicle that generate power and transfer it

what are helicopter powertrain components

engine, freewheeling device, clutch, driveshaft, gearboxes, rotor assembly

what can drive a helicopter powertrain

piston and turbine engines

what determines helicopter engine location

space and weight and balance

bell 47 & hiller 12e engine

6 cylinder vertically installed opposed engine with transmission mounted directly to the output at the top

robinson, schweizer & enstrom

4 or 6 cylinder engines horizontally mounted below the transmissions and driven by v belt assemblies

sikorsky s-55 & s-58

9 cylinder radial engine in the nose of helicopter with the driveshaft extending upwards between the pilot seats on an angle

aerospatiale alouette, lama & gazelle

fixed or single shaft turboshaft engine

most modern helicopters use this kind of engine

free powered turbine turboshaft engine

benefits of a free powered turbine turboshaft engine

high HP & altitude performance

gas producer turbine is also called

N1

power turbine is also called

N2

what joins a pair of turbine wheels together

curvic coupling

the teeth of a helical gear are

slanted which can transmit a large force

this type of gear is used in the power turbine

helical gear

this type of gear has a disk of straight cut teeth around the perimeter

spur gear

this type of of gear drives the gas producer turbine

spur gear

this letter represents rpm

N

how is the speed of the turbine wheels measured on the instrument

in percentage of maximum speed

what devices are driven by the power turbine system

freewheeling unit, N2 tach generator, power turbine speed governor

what devices are driven by the gas producer turbine system

starter generator, N1 tach generator, oil pump, fuel control, fuel pump

what type of engine is the allison 250-c20

a free power turbine turboshaft

what drives the output shaft

the power turbine