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#1
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Diesel aircraft engines for certified and experiimental aircraft are here
now. http://www.centurion-engines.com/c17/c17_start.htm There are others also. |
#2
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Dan wrote:
Diesel aircraft engines for certified and experiimental aircraft are here now. http://www.centurion-engines.com/c17/c17_start.htm There are others also. To prevent going to much OT in rec.auto.tech, if you wish to discuss engines other than car engines, there is a Yahoo group called heat engines, for discussion of any heat engine, IC, steam, or other. http://groups.yahoo.com/group/heatengines/ You can access it as a web discussion group, or you can receive and post via email. We'd be happy to see more folks join, and liven up the discussions. |
#3
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That's not a new design.
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#4
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Wandering aimlessly about the Web, I heard Max Kallio say:
Proposal for a future (helicopter) engine... 2-stroke diesel 2500cc two cylinder 45 degree V (120-150hp) air cooled (cowlings) common rail direct injection (high pressure) supercharged (Whipple fixed displacement max. 25 psi twin-screw) piston ported (or with LIM-type intake valve) Links... www.limtechnology.com www.zoche.de -- SNIP -- I've been watching Zoche for 6-7 years, and as far as I know, they still haven't released anything to the market that you can buy. The material on their web site hasn't been updated in three or four years. Their aerodiesel designs look good -- excellent power/weight, fuel economy significantly better than gasoline, use of more widely available jet fuel or kerosene, projected high reliability and life due to much lower component count than 4-stroke engines, compressed air starter eliminates need for large, heavy cranking battery, etc., etc. Unfortunately, Michael Zoche got wrapped around an axle in typical German mindset by trying to get JAR-E and FAR-33 certification before marketing the engines. That's kept them entangled in bureaucratic red tape for years, particularly in Germany. (The bureaucracy in Germany is phenomenal. It's little wonder Germans have been relatively non-innovative in the world market, compared to Japan and the U.S.) It would have been better to get some of their smaller, lighter engines into the hands of homebuilders and experimenters on a non-certified, use-at-your-own-risk basis to gain operational experience, while they continued to work on JAR and FAA certification. After all, look at the junk ultralight builders have been strapping to their machines for years. A Zoche pre-production engine would probably be as good or better. -- Andrew P. [Post replies to this message on forum only] |
#5
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You have most of it right. Some things you have wrong,
1. Desiel injection timing is differant than on an Otto engine. The fuel is injected during the intake cycle on the Otto engine and the fuel is injected during the ignition cycle on the Desiel. On the Desiel the fuel injection cycle starts just before TDC and ends well after TDC. The fuel ignites as soon as it hits the hot air. 2. The parts count is not less on a two stroke Desiel, It is higher because of the need for a supercharger and a way to port the exhaust. I don't think you would want a four stroke Desiel in an aircraft because of the increased weight and low power. Desiel engines don't really produce more torque as a gas engine, its just that the fuel burns slower and thus the engine cannot rev as fast, but it can produce the same or slightly more torque at lower speeds, and at much lower fuel flow rates. Because of this they should be ideal for an aircraft engine that doesn't need to turn at a higher speed. You do lose one advantage of the Desiel engine on an aircraft. Because of the lack of a throttle and the fact that they can burn extreamly lean at idle, Desiel engines are extremely efficient in stop and go traffic. But we don't idle aircraft engines that much. |
#6
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Wandering aimlessly about the Web, I heard Sport Pilot say:
You have most of it right. Some things you have wrong, 1. Desiel injection timing is differant than on an Otto engine. The fuel is injected during the intake cycle on the Otto engine and the fuel is injected during the ignition cycle on the Desiel. On the Desiel the fuel injection cycle starts just before TDC and ends well after TDC. The fuel ignites as soon as it hits the hot air. etc., etc. --- SNIP --- It's Diesel, not "Desiel". -- Andrew P. [Post replies to this message on forum only] |
#7
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"Andrew P." wrote in message ink.net... Wandering aimlessly about the Web, I heard Sport Pilot say: You have most of it right. Some things you have wrong, 1. Desiel injection timing is differant than on an Otto engine. The fuel is injected during the intake cycle on the Otto engine and the fuel is injected during the ignition cycle on the Desiel. On the Desiel the fuel injection cycle starts just before TDC and ends well after TDC. The fuel ignites as soon as it hits the hot air. etc., etc. --- SNIP --- It's Diesel, not "Desiel". -- Andrew P. Well if you're going to get picky, it's "Auto" engine, not "Otto" engine. MJC |
#8
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MJC wrote: "Andrew P." wrote in message ink.net... Wandering aimlessly about the Web, I heard Sport Pilot say: You have most of it right. Some things you have wrong, 1. Desiel injection timing is differant than on an Otto engine. The fuel is injected during the intake cycle on the Otto engine and the fuel is injected during the ignition cycle on the Desiel. On the Desiel the fuel injection cycle starts just before TDC and ends well after TDC. The fuel ignites as soon as it hits the hot air. etc., etc. --- SNIP --- It's Diesel, not "Desiel". -- Andrew P. Well if you're going to get picky, it's "Auto" engine, not "Otto" engine. MJC Actually, it is Otto, as in 4-stroke spark ignition. nate |
#9
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N8N wrote:
MJC wrote: "Andrew P." wrote in message hlink.net... Wandering aimlessly about the Web, I heard Sport Pilot say: You have most of it right. Some things you have wrong, 1. Desiel injection timing is differant than on an Otto engine. The fuel is injected during the intake cycle on the Otto engine and the fuel is injected during the ignition cycle on the Desiel. On the Desiel the fuel injection cycle starts just before TDC and ends well after TDC. The fuel ignites as soon as it hits the hot air. etc., etc. --- SNIP --- It's Diesel, not "Desiel". -- Andrew P. Well if you're going to get picky, it's "Auto" engine, not "Otto" engine. MJC Actually, it is Otto, as in 4-stroke spark ignition. nate A 4-stroke diesel is still an Otto engine. An Otto cycle engine is one with four strokes, intake, compression, power, and exhaust. Doesn't care whether SI or CI. |
#10
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Actually, it is Otto, as in 4-stroke spark ignition.
Dude, MJC was Joking |
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