Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email

On Mon, 5 Jan 2015 17:11:34 -0400, Leon Fisk
wrote:

Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

I don't think I've seen that one, Leon, but I have heard the name.

It looks great, but the concepts behind it are old. The drive is a
modern version of a swashplate or wobble-plate; Saab built
experimental swashplate-drive engines in the '70s, and I think there
were some very old aircraft engines, probably experimental, that used
swashplate drive. The whole configuration, in fact, sometimes called a
"barrell" engine, has been used in torpedos. It seems to work fine,
but a torpedo only runs a few tens of seconds before it badly needs an
overhaul. g

The porting, however, is actually a form of rotary valves. There have
been many, many engines built with rotary valves of different
geometries. For the most part, they work OK for a while, but they have
big problems with sealing. The see-through animation doesn't show how
that sliding cylinder-to-head arrangement is sealed.

Anyway, it's one to watch. You never know when the next Wankel is
going to come along. The issues, as with the Wankle, are likely to be
sealing-related. But Wankel solved that, and maybe this one will, too.

--
Ed Huntress

"Leon Fisk" wrote in message
...
Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal
combustion
engine with zero first-order vibration, significantly reduced size
and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses
including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

--
Leon Fisk

This is the family of engines it belongs to:
http://en.wikipedia.org/wiki/Axial_engine

On Mon, 5 Jan 2015 17:11:34 -0400, Leon Fisk
wrote:

Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU
Their website has not been updated since 2012 when they were looking
for investors. I can see this being another one of those "money pit"
investment boondoggles. They are not the first, and won't be the last,
so sink hundreds of millions other peoples money into R&D on axial
piston "aircraft" engines.

On Mon, 05 Jan 2015 16:43:14 -0500, Ed Huntress
wrote:

On Mon, 5 Jan 2015 17:11:34 -0400, Leon Fisk
wrote:

Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

I don't think I've seen that one, Leon, but I have heard the name.

It looks great, but the concepts behind it are old. The drive is a
modern version of a swashplate or wobble-plate; Saab built
experimental swashplate-drive engines in the '70s, and I think there
were some very old aircraft engines, probably experimental, that used
swashplate drive. The whole configuration, in fact, sometimes called a
"barrell" engine, has been used in torpedos. It seems to work fine,
but a torpedo only runs a few tens of seconds before it badly needs an
overhaul. g

The porting, however, is actually a form of rotary valves. There have
been many, many engines built with rotary valves of different
geometries. For the most part, they work OK for a while, but they have
big problems with sealing. The see-through animation doesn't show how
that sliding cylinder-to-head arrangement is sealed.

Anyway, it's one to watch. You never know when the next Wankel is
going to come along. The issues, as with the Wankle, are likely to be
sealing-related. But Wankel solved that, and maybe this one will, too.
To be more accurate Toyo Kogyo solved the sealing issue.

On Mon, 5 Jan 2015 16:45:44 -0500, "Jim Wilkins"
wrote:


"Leon Fisk" wrote in message
...
Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal
combustion
engine with zero first-order vibration, significantly reduced size
and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses
including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

--
Leon Fisk

This is the family of engines it belongs to:
http://en.wikipedia.org/wiki/Axial_engine


Dyna-cam and it's successor axial ventures both went T.U. after
spending hundres of millions of dollars of investor money chasing that
dream.

The family of engines it belongs to is "vapour-ware"

On Mon, 05 Jan 2015 17:43:57 -0500, wrote:

On Mon, 05 Jan 2015 16:43:14 -0500, Ed Huntress
wrote:

On Mon, 5 Jan 2015 17:11:34 -0400, Leon Fisk
wrote:

Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU

I don't think I've seen that one, Leon, but I have heard the name.

It looks great, but the concepts behind it are old. The drive is a
modern version of a swashplate or wobble-plate; Saab built
experimental swashplate-drive engines in the '70s, and I think there
were some very old aircraft engines, probably experimental, that used
swashplate drive. The whole configuration, in fact, sometimes called a
"barrell" engine, has been used in torpedos. It seems to work fine,
but a torpedo only runs a few tens of seconds before it badly needs an
overhaul. g

The porting, however, is actually a form of rotary valves. There have
been many, many engines built with rotary valves of different
geometries. For the most part, they work OK for a while, but they have
big problems with sealing. The see-through animation doesn't show how
that sliding cylinder-to-head arrangement is sealed.

Anyway, it's one to watch. You never know when the next Wankel is
going to come along. The issues, as with the Wankle, are likely to be
sealing-related. But Wankel solved that, and maybe this one will, too.
To be more accurate Toyo Kogyo solved the sealing issue.

They also have a lot of patents on rotary valves. In the late '60s, or
maybe the early '70s, they had an engine with a hemispherical, ceramic
rotary valve, which ran in F2. It was hot but it was unreliable. The
valves would jam from fouling.

--
Ed Huntress

On Mon, 5 Jan 2015 16:45:44 -0500
"Jim Wilkins" wrote:

snip
This is the family of engines it belongs to:
http://en.wikipedia.org/wiki/Axial_engine

I hadn't seen the configuration before but then I don't watch too
closely for stuff like that either...

I came across it in the news recently but after some pointers here I
can see that it isn't anything new. As Clare suggested, I
tend to agree that it is probably a money pit...

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email

On Mon, 5 Jan 2015 17:11:34 -0400, Leon Fisk
wrote:

Hi Ed,

Saw this awhile back, looked interesting...

"Duke Engines are in an advanced stage of developing a unique
high-speed, valve-less 5 cylinder, 3 injector axial internal combustion
engine with zero first-order vibration, significantly reduced size and
weight, very high power density and the ability to run on multiple
fuels and bio-fuels. The Duke engine is suited for many uses including
marine, military, automobile, light aircraft and range extender
applications..."

http://www.dukeengines.com/

https://www.youtube.com/watch?v=c19kn3drdFU
====================
Some background and related videos
http://tinyurl.com/qz7anc6
http://tinyurl.com/clr6ovu
http://tinyurl.com/orcth9g
http://tinyurl.com/owa2thk


--
Unka' George

"Gold is the money of kings,
silver is the money of gentlemen,
barter is the money of peasants,
but debt is the money of slaves"

-Norm Franz, "Money and Wealth in the New Millenium"

On Mon, 05 Jan 2015 16:43:14 -0500, Ed Huntress
wrote:

snip
The porting, however, is actually a form of rotary valves. There have
been many, many engines built with rotary valves of different
geometries.
/snip
Just came across this on YouTube
http://tinyurl.com/qycajld
F1 engine MGN W12 with rotary valves. F1 Motor mit
Drehschieberinlass


--
Unka' George

"Gold is the money of kings,
silver is the money of gentlemen,
barter is the money of peasants,
but debt is the money of slaves"

-Norm Franz, "Money and Wealth in the New Millenium"

On Tue, 06 Jan 2015 22:13:42 -0600, F. George McDuffee
wrote:

On Mon, 05 Jan 2015 16:43:14 -0500, Ed Huntress
wrote:

snip
The porting, however, is actually a form of rotary valves. There have
been many, many engines built with rotary valves of different
geometries.
/snip
Just came across this on YouTube
http://tinyurl.com/qycajld
F1 engine MGN W12 with rotary valves. F1 Motor mit
Drehschieberinlass

Ah, yes, the MGN. A stillborn child. g

--
Ed Huntress