[Techlunch] FW: The Duke Engine

techlunch at happy.emu.id.au techlunch at happy.emu.id.au
Mon Mar 17 21:40:56 EST 2014

An interesting engine - I'm still not sure how the cylinder seals 
against the pistons for compression.

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Neil VK1NP

On 16/03/2014 6:01 AM, techlunch at happy.emu.id.au wrote:
> Hello all. This may well be a new concept for an internal combustion 
> engine, but while I was an apprentice, (early 50's), DC6B 
> superchargers work this way; I used to watch the aircraft mechanics 
> overhauling them. They probably suited radial engines more than in-line.
> Not necessarily new in the mechanical sense.
> Cheers all John.
>     ----- Original Message -----
>     *From:* techlunch at happy.emu.id.au <mailto:techlunch at happy.emu.id.au>
>     *To:* techlunch at happy.emu.id.au <mailto:techlunch at happy.emu.id.au>
>     *Sent:* Saturday, March 15, 2014 12:38 PM
>     *Subject:* RE: [Techlunch] FW: The Duke Engine
>     Interesting concept -- I can already see a whole host of new
>     "issues" this engine configuration introduces.
>     High centrifugal forces on the pistons as they rotate around the
>     engine will quickly cause the cylinder to wear in an oval shape
>     (outer cylinder wall takes all the force)
>     With the pistons, crank and conrods all rotating there is a
>     significant amount of "fly wheel mass".
>     All the rotating engine components must be very accurately
>     balanced or you can introduce some nasty vibrations and
>     potentially nasty harmonics
>     Removal of the cam means all the port timing is done via ports --
>     like 2 strokes.
>     Just like two strokes, engine performance characteristics will be
>     greatly affected by inlet and exhaust "tunning"
>     There is a bunch of other things that I need to think a bit more
>     about... such as the efficiency of the crank to drive coupling.
>     Thanks for the brain food.
>     Wally
>     *From:*techlunch-bounces at happy.emu.id.au
>     [mailto:techlunch-bounces at happy.emu.id.au] *On Behalf Of
>     *techlunch at happy.emu.id.au
>     *Sent:* Friday, 14 March 2014 6:51 AM
>     *To:* techlunch at happy.emu.id.au
>     *Subject:* [Norton AntiSpam][Techlunch] FW: The Duke Engine
>     I had not heard of this before ..
>     GH
*A**more efficient internal combustion engine

*This thing is fascinating to watch in action.

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