The Rolls Royce Nimbus 503 Gas Turbine - Page 1

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Our Engine comes from a Westland Wasp Helicopter, we are only going to use the gas generator section, the free running turbine mounted on the back of the engine that normally drives the rotor blades will not be used.

This is a front view of the Nimbus 503 Gas Turbine mounted on its transporting crate, as you can see the foreign object damage cover is in place, with the 24volt starter/ generator in view, top left of the engine.

A rear view of the gearbox assembly that will not be used on the Jet Pickup. The Nimbus produces a fast stream of gas which then spins a high speed turbine wheel, which then in turn powers a gearbox (shown above) this drives the helicopters rotor blades via a connecting shaft.

A view of the engines dispersing exhausts, with the gearbox just visible, the cables mounted on top of the exhausts are thermocouples, these will have to be removed and mounted on to the new exhaust nozzle which yet has to be fabricated out of stainless steel.
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The pipe work in the midground is the engines anti-icing heating system, this of course doesn't really need to be left installed as we hopefully wont have to worry about falling out if the sky if its cold. The theory is the less we modify on the engine the better.

The pipe clearly shown in the middle is the anti icing and starter/ generator exhaust vent. The exhaust is constructed this way as the engine when mounted on a wasp has no cover over it and thus has to be a water proof design.
That's the pipe work to the gearbox disconnected, now to unbolt the supporting bolts and separate the gearbox and engine.

A slightly nervous bit, next time I will fabricate an engine lifting frame, though the webbing does a good job.
At last, finally the engine has been separated from the gearbox and is now sat happily on the blue running frame, we can now start looking at how to get the oil, fuel and electrical systems configured. Much easier to work on!

One of my friends 'Rob' who has kindly given lots of his precious spare time to this project. Here he can be seen with the separated gearbox/ exhaust assembly. The gearbox rotor drive can be seen below the free turbine inlet.

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