310 HP 680 TQ aircraft engine V8

[AKAMAC]

http://www.aero-news.net/index.cfm?...03/2004&ToDate=11/10/2004&Category=/index.cfm



I'm just curious how they got this out of a 4. 0L engine. Go diesel power!

Notice the 2k hr service interval and increase in fuel use hours. Technology... ... I love it!

 

[dalton4]

They are talking prop shaft numbers. There is a gearbox between engine and prop. A gearbox has to be used to keep the engine rpm up in the power rpm range and at the same time keep the prop speed down. Spin the prop too fast and you will loose efficiency due to prop tip speed.

 

[Vaughn MacKenzie]

There have been some noteworthy advances in aviation diesel design. There are many who are interested in the benefits of a single fuel aviation system where piston aircraft also burn jet fuel. Of course that is many years away. But there are a few diesels close to or already on the market. They offer tremendous fuel economy, and simplified operation since fuel mixture is no longer a concern, and carburetor icing.



Propeller tips need to be kept from breaking the sound barrier. What amazes me is how competetive WW2 fighter planes are able to fly as fast as they do. Certainly there has to be a limit to propeller-driven aircraft speeds. Dago Red has turned 490 MPH qualifying speeds in his P51 Mustang, and holds the 15km straight-line speed record with an 517 MPH average http://www.dagored-airracing.com/



When I did some looking the fastest prop plane ever was around 540mph, and the fastest flat-out piston speed is close behind at a phenomenal 528mph, done in a F8F Bearcat http://www.rarebear.com/page1.html

Edit: I see Bearcat made 528 on a closed course, and estimated top speed at 5000ft is 540mph. Wheepoppers!



Vaughn

 

[snowracer69]

Diesel = good.



FADEC = good.



Rarebear and dago = impressive, but just a $$$ game... whoever spent more that year wins.



Where it's really at is the sport-class. If you want to see what will be making its way into the world of aviation in the upcoming years, just look at what Darryl Greenemeyer is doing with his highly modified Lancair Legacy, as well as John Sharp in his Nemesis NXT (which crashed this year, but will be back next year, along with 3 other kits of the same plane being flown by different teams). Darryl needed a new prop so he could run his engine at over 3200 rpm during the race and not lose speed... Hartzell designed him a brand new prop, and now everybody runs it (swept tips, very skinny airfoil, and it's a supercritical airfoil to boot).



So, when I get Cummins to build me a 4 cylinder engine for use in a Lancair, how many of you will commit to buying one? Gonna take a heck of a sales pitch to the head fellas in the company, but think I can get it done

 

[AKAMAC]

Thanks for the clairification Dalton. Makes sense.

Vaughn, I got the same info from the Helo pilots at Aspen Air in Oxnard. You are so right.

SR69, ya gotta love the Reno air races, those guys are nuts. Major HP out of those 12's.

 

[Steve St.Laurent]

Diamond aircraft will most likely be the first to market with a production diesel piston airplane - the TwinStar. They are taking orders now and AOPA Pilot recently had a flight test of one in the magazine. One recently recently flew non-stop across the atlantic at 42% power flying at an average ground speed of 152 kts (they didn't give an air speed but since the flight was west to east there's a good chance there was a tailwind helping them along) burning only 5. 74 gph (2. 87 gph per side)!! That's incredible efficiency - just over 30 mpg at 174 mph.



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Pretty cool stuff.

 

[ezcurra]

There have been planes with diesel engines for some time. Back in the 1930's there was a version of the Junkers Ju-52 with three 2-stroke diesel engines.

 

[Sageair]

Wouldn't it be nice flying behind an engine where an ignition system has been eliminated? So long as they don't use a lift pump I'd even fly single engine over water without much trepidation.

 

[klenger]

Real airplane engines are round, whether they burn Jet A or 100 Low Lead.



Well, then there's the P-51 and P-38...

 

[CJEliassen]

Just found this thread.



Some other diesel engines are:

www.zoche.de

www.smaengine.com

www.deltahawkengines