G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile


Buell Forum » Quick Board » Archive through March 05, 2014 » Warning: Non Political Thread. « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Kcfirebolt
Posted on Monday, March 03, 2014 - 12:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just thought this was cool.

http://pixelbark.com/13045/how-the-duke-engines-in creases-the-efficiency-of-the-internal-combustion- engine
Top of pagePrevious messageNext messageBottom of page Link to this message

Sifo
Posted on Monday, March 03, 2014 - 01:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I thought this was going to have something to do with KTM!

Still pretty cool. Looks like a good deal of rotating mass is involved. That may be problematic for some applications. Not so much for other applications. I wonder how they get a good durable seal between the cylinder and the head?
Top of pagePrevious messageNext messageBottom of page Link to this message

Oldog
Posted on Monday, March 03, 2014 - 03:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

reminds me of a variable displacement hydraulic pump.
Seems like they trade a rotating cylinder block for the valve train. I would perhaps incorrectly guess that the moving parts total weight is higher in the duke engine as the actuator and cylinder block has to weigh more than a set of cams and related hardware...
Top of pagePrevious messageNext messageBottom of page Link to this message

Hootowl
Posted on Monday, March 03, 2014 - 03:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

How is this different than an axial engine? I'm at work, and couldn't have the sound up. If they said something about this in the video, I'm afraid I missed it.
Top of pagePrevious messageNext messageBottom of page Link to this message

Tq_freak
Posted on Monday, March 03, 2014 - 04:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

pretty cool, its like a standard ICE and a Wankle had a baby.

Like its been said I would worry about the cylinder to head seal and also the CV type joint at the crank shaft.
Top of pagePrevious messageNext messageBottom of page Link to this message

Griffmeister
Posted on Monday, March 03, 2014 - 09:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I agree, a Wankel with pistons. Mazda put their engine in production vehicles before they really had durable seals, but they did get it to work after a few years. Maybe the "Duke" just needs a real life test bed to develop it's potential.
Top of pagePrevious messageNext messageBottom of page Link to this message

Aesquire
Posted on Monday, March 03, 2014 - 10:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wonder about friction.

If you want real insane complexity, the Napier Sabre was a sleeve valve engine built & nigh perfected by the Brits in WW2.

http://en.wikipedia.org/wiki/Napier_Sabre

The piston rides in a sleeve, which has ports ( like a 2 stroke ) which in turn rides in the cylinder, which also has ports. The head is nearly flat with just a spark plug.

The sleeve goes up & down and rotates back & forth in the cylinder, driven by a little cam/crank thing.....

http://auto.howstuffworks.com/sleeve-valve-engine. htm

btw, the animation shows 2 sleeves, which is not needed afaik. Napier didn't. So just imagine the outer sleeve as the cylinder, and go from there.

You may notice a lack of these engines in cars. ( even though they Began in the US built Knight )

This Duke engine looks interesting. I bet they are working hard to sell it for drones. ( Everyone Is Working Hard to sell their engines for drones )

There's been an axial engine promised for airplanes for years. Haven't seen one for sale that actually runs though, seems to be stuck forever in R&D.
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration