I paid a visit to fellow turbine addict
Lee Dennick and as it turns out he had for sale a spare
reheat tube made specifically for a JFS100-13A, so a
deal was
done. After renewing some of the pipe fittings, purchasing
a fuel boost pump from a Sierra Cosworth and a new Igniter
Exciter from Avon Aero, (as if I had an unlimited source
of cash) all were fitted and the time had come for a
test run.
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Hmm - no ignition,
I had a chat with Paul and Lee and they gave me some
ideas and as it turns out the fuel flow from the pump
was too high resulting in a rich mix, I restricted the
flow
by crimping a pair of mole grips on the fuel pipe and
the right mix was eventually found at around 85% RPM.
Unfortunately
I could not make ReHeat ignition at 100%. I replaced
the mole grips with a 12volt electronic speed controller
form
cpc.co.uk and
persisted.
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Straight
up the pipe. The spotters of you may notice that the
flame shield is back
to front, I noticed this after the first attempted test
run, I then changed it to face rear, it was noticed
that the Igniter Plug was in quite a sorry state, but
just
about still functional. Still persisting with the ReHeat.
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S*d it. Not having
a fun time. The Igniter plug has worn and come
loose and the thread is barely visible so of it goes
to the scrap bin.
The afterburner uses so much fuel
and at the moment without impressive results, so I have
taken it off and I will use the original nozzle for
now
and
have
some
fun
before
the winter sets in. I feel
that the AB nozzle will need to be reduced as well. The
money that these projects cost, sometimes you just have
to say, enough is enough. I will try the reheat again
early next year, which gives me some time and money
(which is limited) for my other turbine projects.
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A Vid Cap of
some fuel being sent in to the afterburner on shutdown
and ignited. This was done for the spectacular flame
and no other purpose. It makes me feel better about
the time spent on it.
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This is turning
out to be another Doom page. Today the throttle plunger
was fitted. The throttle pulses when run at 100%, possibly
due to the throttle assembly flexing and/or the plunger
not being sat on the governor spring correctly, also
the turbine flame outs when run below 80%; does anyone
have any ideas on what's happening? I reckon one possible
reason is because of the reduced revs and consequently
reduced fuel pressure, there is poor atomisation of
the fuel from the injectors, indicating that the injectors
may need a service?
Due to the hot starts which need careful monitoring a Thermometer has now
been added to the control panel as per the image above.
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