Here's some cruise BSFC's of sub-1000 hp turboprops:

Solar 60 /130 hp - 1.20
Allison/RR 250 /317 hp - 0.73

Allison/RR 250 /500 hp - 0.66
P&WC PT-6 /500 hp - 0.67

BSFC gets somewhat better with size:

P&WC PT-6 /1020 hp - 0.58
P&WC PW127C/ 2130 hp - 0.52

How about designing a pilot and a main injector that install in a place
of leading and trailing spark plugs? - together with suitable ECU and
injector pump.

What's new here compared to JD's system, is that pilot flame and spark
should be on same body, and both injectors should spray in ~70-80 deg.
angle compared to injector body. That should be doable.

That makes a ~2000 USD kerosene modification - for stock engine! :)

John Deere's SCORE engine BSFC figures were somewhere around 0.5 lb/Hph.
That's not bad, since JET is cheaper than 100LL - especially in Europe.
And cost of engine is... well, cheapest real turboprops are starting
from abt. 200 000 usd...

If 0.5 BSFC with JET A-1 isn't enough incentive for some application,
further refining and Turbo-compound should lower the BSFC figure to
somewhere around 0.4.

Of course, there's other things that need and should be done first, like
firewall-forward kit and turbo-compound, but after those...

Cheers,
Petri


Mid West (UK) demonstrated a two rotor Wankel a few years ago running on JET
A1 using an injector engine. The only problem was starting from cold, but
the answer was simple, start the engine with petrol (gasoline) then once
running change over to jet fuel.Both fuels had oil added.

Peter Whitehead


Peter,

Where where the injectors located on such an engine?

Doug in Japan



Hi You Guys

Greg Richter of Blue Mountain Avionics told that he had run his then 13B
powered ( can't remember if it was a cozy or Long) but I remember the
conversation about the Midwest/Norton running on Jet1 which I had seen
running and staring on Jet1 it used the same configuration as Avgas, Greg
said he had also ran his 13B on Kerosene and that as long as you could spin
it fast enough it would start. A couple of years ago I was talking to an
engineer who had been working on the Rotary project at Midwest he said
exactly the same thing about the Midwest, that as long as it could be spin
fast enough on the starter then it would run.  So two separate sources seem
to be in agreement, however the curious thing is no one has marketed one
since.  So I can only guess there is some other problem???? The German

Wankel firm have touted heavy oil spark ignited for years but never replied
when I expressed an interest?  In cold whether starting on petrol, wouldn't
be too much of a hardship to have a quart of petrol and an Essex primer.
But I'm fairly sure that advantage in BSFC is not going to be very much
better than a Lycontinental on Avgas.  BUT for a lot of people the ability
to run on a freely available fuel ie Jet1 as apposed to the increasingly
high priced likely to be soon fazed out Avgas would be enough in its self?

Clive UK