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Small diesel engines ???

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Old 10-04-2005, 02:56 PM
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Default Small diesel engines ???

Ok world wide knowledge base, I need to find some candidate 3HP diesel engines. It will be going into a helicopter so "light" is a key factor, followed by reliability and no-fuss starting. Air cooled preferred, but will look at water cooled if I can handle the radiator weight.

-Greg
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Old 10-04-2005, 03:08 PM
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Default Re: Small diesel engines ???

Light and diesel don't really go together very well. Yanmar would be a good small diesel candidate. I've got a spec sheet and they make a 4hp (L48EE) air cooled engine that makes it's power at 3600rpm. Dry weight is 26.5kg with a pull start. That's right around 58 pounds plus fuel and oil.
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Old 10-04-2005, 03:18 PM
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Default Re: Small diesel engines ???

Yes, most small diesels are much too heavy. I need the weight to be around 10-12 lbs for the base engine w/o starter.

Thanks - Greg
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Old 10-04-2005, 03:21 PM
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Default Re: Small diesel engines ???

10-12 lbs? You're almost going to be stuck in the realm of some kind of 2 stroke weed whacker or chainsaw engine or something along those lines. Good luck though.
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Old 10-04-2005, 03:23 PM
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Default Re: Small diesel engines ???

Why not a microturbine? It's the only way you'll get the power to weight ratio you're looking for reliably.
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Old 10-04-2005, 03:27 PM
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Default Re: Small diesel engines ???

http://www.wren-turbines.com/turboprop.htm
7.1HP at only 3.52 pounds.

Helicopters:
http://www.wren-turbines.com/Helicopters.htm

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Old 10-04-2005, 03:31 PM
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Default Re: Small diesel engines ???

Started by looking at model aircraft diesels, but they don't go big enough (only about 1.5 HP) and aren't really reliable enough.

We have some of the micro-turbines and are looking at them, but the sfc is the pits (about 2.7#/HP-hr).

In the past we have worked with companies like Sonnex and UEL to convert gas/spark engines to heavy fuel (diesel) but none of them really fit this application.

If it was easy I wouldn't have had to invoke such a large support base to find a solution

Thanks - Greg
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Old 10-05-2005, 09:11 AM
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Default Re: Small diesel engines ???

Ya, I can understand the fuel consumption aspect. The unit in my link above consumes about 3.62 #/HP-Hr, but that's at wide-open making 7.1 horsepower. If you only need 3HP, the smaller turbine consumes about 2.1 #/HP-hr. Probably still too much. Tough project.

Your next best bet is a small Ion Generator fueling a dispersive high-energy rotary powerplant. (I might just have to go patent that).

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