Electric / Turbine Powered Rover MGF (1)
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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.
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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. |
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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. |
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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.
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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.
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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. |
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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. |
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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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MGF
(11)