Electric / Turbine Powered Rover MGF
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Hybrid Electric Gas Turbine MGF
Hybrid Electric Gas Turbine MGF
The GTP70 shaft drive (6000rpm) gas turbine engine is my current choice for the power plant of this project. There are downsides, it cannot be throttled to a point where it can be used to reliably control the speed of a vehicle, on the positive though, the sound levels are below 99dBA, a requirement to be allowed on UK roads.

To confirm the sound levels, a meter was placed 50cm and 45 degrees from the exhaust, in this particular case the engine was run up to 100%, although no load was present, you can see 93.2 dBA was recorded which is good news, with a silencer of sorts this could be reduced.
Hybrid Electric Gas Turbine MGF
Hybrid Electric Gas Turbine MGF
Next I ran the engine at 60% to see if the levels had been reduced, although slightly less at 91.4 dBA it became obvious in this test at least that engine speed had a minimal impact on volume.
In the garage from days long ago, I found the original silencer from a GTP30, a similar but substantially smaller engine and decided it was worth seeing if this made a difference to the levels, a drop of about 0.2 dBA was recorded, a small amount, but none the less it was quieter.

Hybrid Electric Gas Turbine MGF
Hybrid Electric Gas Turbine MGF
My second option for a power plant was a Rover 1S60 generator set, I went to see Ian and we ran it up whilst checking the sound level, slightly higher at startup (96.8dBA), but it soon settled back to 89dBA once running.

I then made some measurements, around this time I had just purchased my donor car and it soon became obvious that the 1S60 wasn't going to fit, a shame as I would like to have had a Rover engine in a Rover car.
Hybrid Electric Gas Turbine MGF
Hybrid Electric Gas Turbine MGF
The third option was a GTP30, measurements were made and with a bit of work to the car it would fit, which was a relief, the only downside is that the power output would now have to be 25kVA, still enough though, just.
The max dBA level recorded of the GTP30 was 91.8dBA, not a lot quieter that it's big brother the GTP70, but has now become the final choice of engine.

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