Boeing 787-8 Trent 1000 Engine Start

Rolls Royce Trent 1000
Type: Three-shaft high bypass ratio (11-10.8:1) turbofan engine
Length: 4.738 m (186.5 in)
Diameter: 2.85 m (112 in) (Fan)
Dry weight: 5,765 kg (12,710 lbs)
Compressor:
Single stage LP, the Fan (N1),
Eight-stage IP (N2),
Six-stage HP (N3)
Combustors: Tiled Annular combustor
Turbine:
Single-stage HP (N3),
Single-stage IP (N2),
Six-stage LP (N1)
Maximum thrust: 72066lbs (This Trent 1000-G)
Overall pressure ratio: 52:1 (Top-of-Climb)
Thrust-to-weight ratio: 6.189:1
Cost: Approx $16.25m per Engine
Each Trent 1000 engine is started using two electric starter/generators. You will notice that the initial noise is different to that heard in my previous videos, a characteristic whine of an electric motor!
It can't be heard for long however as the whine is quickly drowned out by the noise of rushing air. Once the engine has started, the motors switch their function to generators to provide electrical power to the aircraft, about 800 kilowatts in total, four times that of a 777. They provide 235v at 250KVA each and are frequency wild instead of the usual 115v at 400hz.
There are several reasons for this increase in electrical power, one of which is the way air is supplied to the passenger cabin. Instead of bleed air (tapping off air from an engine compressor) the 787 uses electric motor driven compressors to provide air to the cabin.
Two differences from other Rolls Royce 3 shaft engines worth mentioning are:
1. A contra-rotating HP shaft
2. The Accessory gearbox is driven from the IP shaft, whereas it would normally driven by the HP on most engines
Random Facts:
• Each of the 66 HP turbine blades makes 800horsepower at take-off, that's 52,800hp just to drive the HP compressor.
• Fan tips reach 900mph, HP turbine blade tips can reach 1200mph
• At take-off the Fan munches through 1.25tons of air per second
• Combustion temperature is 2000c, the combustion chamber material melts at 1300c (it doesn't due to cooling)
• Although heavier, a 787 is half as loud as a 767
• The Trent 1000 engine has around 18,000 individual components and 35,000 parts.