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How about 2-stroke diesel for helicopters
I'm really interested in these new ZOCHE aero-diesels www.zoche.de.
They are air cooled, piston ported, radial configuration, turbo- and supercharged, high pressure direct injection 2-stroke diesels. The 70hp weighs 55kg (121lbs) and uses 10.1L (2.68gal) per hour @75%. The TBO is expected to be 2000hr and guite cheap too. Low parts count and slow revs. 70hp is not enough for a two seater helicopter, but they do have 150hp which could be very usable. Weight 84kg (185lbs) and consumption @75% 21.1L (5.57gal). Of course, the cooling could be a problem, especially in howering in hot climates. Electric blover could be rather light and quite effective. So, here´s my question: How about using diesel fuel for cooling the engine hot spots? The boiling point is as high as 160c (320F). This could mean no exess weight int the form of coolant. Could the injection pump be used to circulate this coolin fuel as well, eliminating a need for another pump? This would also make sure that the diesel is hot enough in col climates. The tank could possibly even have some fins to cool the fuel down in the rotor wind. i suppose the fuel will remain rather cool anyways, since the tanks surface will be relatively large and made of thin sheet. Actually, come to think of it. ZOCHE already has this system. A large amount of the fuel is circulated through the motor to heat the fuel in the tank to avoid gelling in cold climates. Is this circulation enough to cool down a hovering helicopter in hot climates remains a question. What do you think? Of course, I probaly should contact Zoche and ask this and perhaps read theid FAQ more thoroughly. The weight disadvantage (if there really is any at all) coulb be compensated with the smaller amount of fuel required in the tank for a flight. Your thoughts? Is 2-stroke diesel the future (in the ultralights)? |
#2
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On 23 Mar 2005 05:44:32 -0800, Max Kallio wrote:
So, here´s my question: How about using diesel fuel for cooling the engine hot spots? The boiling point is as high as 160c (320F). This could mean no exess weight int the form of coolant. Use Google to look up the thread "Dumping engine heat into fuel tanks" in rec.aviation.homebuilt. The short answer is that if you tried this, you would very quickly boil away all of your fuel. |
#3
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Max Kallio wrote:
I'm really interested in these new ZOCHE aero-diesels www.zoche.de. They are air cooled, piston ported, radial configuration, turbo- and supercharged, high pressure direct injection 2-stroke diesels. The 70hp weighs 55kg (121lbs) and uses 10.1L (2.68gal) per hour @75%. The TBO is expected to be 2000hr and guite cheap too. Low parts count and slow revs. 70hp is not enough for a two seater helicopter, but they do have 150hp which could be very usable. Weight 84kg (185lbs) and consumption @75% 21.1L (5.57gal). Of course, the cooling could be a problem, especially in howering in hot climates. Electric blover could be rather light and quite effective. So, here´s my question: How about using diesel fuel for cooling the engine hot spots? The boiling point is as high as 160c (320F). This could mean no exess weight int the form of coolant. Could the injection pump be used to circulate this coolin fuel as well, eliminating a need for another pump? This would also make sure that the diesel is hot enough in col climates. The tank could possibly even have some fins to cool the fuel down in the rotor wind. i suppose the fuel will remain rather cool anyways, since the tanks surface will be relatively large and made of thin sheet. Actually, come to think of it. ZOCHE already has this system. A large amount of the fuel is circulated through the motor to heat the fuel in the tank to avoid gelling in cold climates. Is this circulation enough to cool down a hovering helicopter in hot climates remains a question. What do you think? Of course, I probaly should contact Zoche and ask this and perhaps read theid FAQ more thoroughly. The weight disadvantage (if there really is any at all) coulb be compensated with the smaller amount of fuel required in the tank for a flight. Your thoughts? Is 2-stroke diesel the future (in the ultralights)? Lessee. At 70 hp, 50% would be waste heat. 5 gal tank would carry off 26.5 Kilowatts, boiling the fuel oil in about 5 minutes, not counting other heat removal processes. The cooling jacket and contents would interfere with the normal air cooling fins. Nope. Radial 2 stroke diesel? gotta love it. Let's see one on a dyno. I want to see an engine cooled with injected water timed at maybe 45 degrees after tdc. The pre heated cooling water would boil, absorbing heat, possibly increasing pressure in the cylinder, then it could condense after exhaust in the muffler giving up it's heat, then being recycled through the engine. That combined with lean burn mixtures might benefit emissions, too? Has it been tried? Terry K |
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