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Diamond DA-40 with G-1000 pirep



 
 
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  #101  
Old July 21st 04, 03:04 PM
G.R. Patterson III
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Dave Butler wrote:

Why "especially with all the accessories installed"?


The injection system tends to be more complex and heavier than gasoline models or
carburettors. This is because the injectors spray fuel directly into the cylinder
rather than into a section of the intake manifold. Many diesels handle the higher
CHTs by using water cooling systems, and those add weight (Lycoming was working on
one of these a few years ago). On the other hand, the glow plug systems used for
starting tend to be lighter than the magnetos used in gas engines.

The main cause of the weight difference is still the fact that everything must be
beefed up to handle the higher compression, though.

Why is a 2-stroke cycle engine lighter than a 4-stroke?


There are twice as many power pulses per minute with a 2-stroke. They usually are not
as efficient as a 4-stroke, so you don't get twice as much power, but they will
easily produce 1.6 times the power of a 4-stroke the same size, and most do better
than that. So a 200hp 2-stroke engine is smaller than a 200hp 4-stroke engine. In
addition, 2-strokes don't have a valve train, which saves some weight.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.
  #102  
Old July 21st 04, 03:55 PM
C J Campbell
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"Thomas Borchert" wrote in message
...
Dude,

Diamond has
decided to offer Lycoming engines as an alternate for the Twin Star

(which
must really please Textron)


Diamond has been bitten before when introducing a new engine to the US
market, the Rotax. So they're careful. The US market is strongly in the

grip
of what I like to call "pilot inertia", as evident here in the group.

"We've
always done it that way, so we'll keep doing it that way" is strong in the
pilot community.


The US pilot community is that way for a reason. The performance of the
Rotax was miserable. Embry-Riddle ended up getting rid of all their Katanas
because of it.


  #103  
Old July 21st 04, 03:56 PM
C J Campbell
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"Thomas Borchert" wrote in message
...
Mike,

I'm surprised there isn't more interest in the diesel version in the US.
What percentage of DA40s sold in Europe are diesel vs. gas?


It is not offered in the US. Simple as that.


It is not certified here, either.


  #104  
Old July 21st 04, 04:17 PM
Thomas Borchert
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C,

The US pilot community is that way for a reason.


Well, sometimes yes, sometimes no.

The performance of the
Rotax was miserable. Embry-Riddle ended up getting rid of all their Katanas
because of it.


Then it may have been miserable for their mission (Prescott, AZ, anyone?).
But that doesn't mean it was unsuitable for others.

--
Thomas Borchert (EDDH)

  #105  
Old July 21st 04, 04:17 PM
Thomas Borchert
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G.R.,

. Since some of the new diesel designs are
2-stroke, and most gas engines are 4-stroke,


None of those certified or close to certification are 2-stroke. And all
the Thielert engines are very close to the Avgas engines they replace,
weightwise.

--
Thomas Borchert (EDDH)

  #106  
Old July 21st 04, 04:17 PM
Thomas Borchert
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C,

It is not offered in the US. Simple as that.


It is not certified here, either.


Don't be a smarta.. Why certify something that isn't sold?

--
Thomas Borchert (EDDH)

  #107  
Old July 21st 04, 04:19 PM
Pete
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Why "especially with all the accessories installed"?

-heavier high-pressure fuel pumps, lines etc which are not needed on gas
engines.
-on two strokes you need a supercharger to get them started.

Why is a 2-stroke cycle engine lighter than a 4-stroke?

-less stuff: with twice the power strokes per piston, one needs fewer
pistons and all associated stuff. For example the three cylinder Wilksch is
as smooth as a six cyl gas engine http://www.wilksch.com/

If only they could be lighter :-)

Cheers & blue skies,

Pete

Europa Builder A239 dual-wing

http://europa.zutrasoft.com



"Dave Butler" wrote in message
...
G.R. Patterson III wrote:

Aren't they also heavier, i.e., pound of engine weight per HP generated?


Every one of which I've read is heavier than an equivalent gas engine,

especially
with all the accessories installed. Since some of the new diesel designs

are
2-stroke, and most gas engines are 4-stroke, though, some of the newer

ones may
actually come in lighter than the equivalent gasoline engine (if they

ever make it to
production).


Help me out here.

Why "especially with all the accessories installed"?

Why is a 2-stroke cycle engine lighter than a 4-stroke?

Thanks.

Dave



  #108  
Old July 22nd 04, 04:27 AM
Mike Schumann
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It is really frustrating, as a consumer, to see cars and planes sold abroad
with the latest technology, getting 30% better fuel economy, and the same
products are not available here, because the manufacturers have the attitude
that US consumers don't care about fuel efficiency.

When you look at the increased range and payload possible with the DA40 with
a diesel engine, due to its significantly lower fuel consumption, you'd be
crazy to buy anything but a diesel, unless there are issues with the newness
of the engine.

Mike Schumann

"Thomas Borchert" wrote in message
...
Mike,

I'm surprised there isn't more interest in the diesel version in the US.
What percentage of DA40s sold in Europe are diesel vs. gas?


It is not offered in the US. Simple as that.

--
Thomas Borchert (EDDH)



  #109  
Old July 22nd 04, 05:28 AM
Dude
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Was it the performance, or the lack of any idea how to fix the things, or
the amount of scheduled and non scheduled downtime?



"C J Campbell" wrote in message
...

"Thomas Borchert" wrote in message
...
Dude,

Diamond has
decided to offer Lycoming engines as an alternate for the Twin Star

(which
must really please Textron)


Diamond has been bitten before when introducing a new engine to the US
market, the Rotax. So they're careful. The US market is strongly in the

grip
of what I like to call "pilot inertia", as evident here in the group.

"We've
always done it that way, so we'll keep doing it that way" is strong in

the
pilot community.


The US pilot community is that way for a reason. The performance of the
Rotax was miserable. Embry-Riddle ended up getting rid of all their

Katanas
because of it.




  #110  
Old July 22nd 04, 05:32 AM
Dude
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Posts: n/a
Default

When you look at the increased range and payload possible with the DA40
with
a diesel engine, due to its significantly lower fuel consumption, you'd be
crazy to buy anything but a diesel, unless there are issues with the

newness
of the engine.


Exactly, the problem. In addition , the American market has been less
forgiving and experimental than the european market. I don't know why. But
that seems to be the belief of the manufacturers.

The margins are low, and the risks are high, and so less chances will be
taken here than over there.



 




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