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)

Single stage LP, the Fan (N1),
Eight-stage IP (N2),
Six-stage HP (N3)

Combustors: Tiled Annular combustor

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.


  1. This engine has been a victim of its complexity. It is probably the most complex engine ever produced for a production aircraft. The GE90 and GEnx are both much simpler engines which have fewer individual components and only two spools rather than three.

  2. On a Two-spool engine, the starter is always connected to the high pressure system, or N2. On a three spool system such as this, which spool or spools is the starter hooked up to? In the description, you say it has two starter/generators. That makes me believe that both the high pressure and intermediate pressure spools are turned. Seems like just turning the high pressure compressor wouldn't generate enough air for the combustion chamber. Can you please clarify?

  3. Can someone explain what is making the fan turn counter-clockwise right at the start? Is it air coming from the rear turbine or is it something else?

  4. Mrt fixplanes – is there ever anything worth seeing [like engine tests] from Eastchurch Road?  Whenever I have walked along it there has always been a BA 747 parked up but no obvious activity.  Thanks.

  5. That is cool video. Can you write something about this electric starter? When majority of turbofans uses air turbine starter instead of electric one, what is the reason? I suppose that electric starters would have to be too heavy and complex but now with current technology this was now possible? Thanks.

  6. They may not "sound" quite as amazing as say an older RB211 model (and, I know that's a purely subjective observation), but these newer engines are still plenty awesome.  That core looks tiny compared to that fan………amazing stuff.  Just a great vid!

  7. Thanks for the informative descriptions. It is amazing that they can start a big engine like this electrically. Also is the output converted into a constant frequency on buses where more sensitive electrical components are on?

  8. The last fact in your blurb doesn't make sense…18,000 individual components and 35,000 parts. Isn't an individual component a part? Or do you mean 18,000 assemblies CREATED from 35,000 parts?

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