This might make an interesting model concept

[kvom]

http://www.ecomotors.com/

Two opposed pistons in one cylinder.

 

[lazylathe]

Wow! That is compact!
If your timing is out just a fraction you will find your self in a whole lot of trouble! ;D

Interesting idea and concept though!

Andrew

 

[ChrisB]

Fascinating design, looks like a wonderful idea, and as you say a really great model concept.

Perhaps a touch beyond my Ez-Engine skills though :big:.

Nice link.

 

[kf2qd]

Same basic idea as the Fairbanks-Morse engines used in some submarines during WWII. They were 5 cylinder units - cranks were slightly out of phase with each other with the crank connected to the generators putting out more power than the crank attached to the blower.

 

[bambuko]

... Two opposed pistons in one cylinder...

That's nothing new - opposing pistons in one cylinder have been done many times before in railways, submarines and aeroplanes.
The claim to fame for this particular design is the concept of OPOC - Opposing Pistons Opposing Cylinders.
It's the opposing cylinders (ie boxer layout) used with opposing pistons that makes it novel.

... If your timing is out just a fraction you will find your self in a whole lot of trouble!...

This design is supposed to be two stroke diesel... so there should be no timing issues?

Chris

 

[Jasonb]

MEB published plans a few issues back for a twin opposed piston engine by Doug Kelly, video of it here

http://www.modelenginebuilder.com/Doug Kelley opposed piston twin-large-2.mov

J

 

[ChooChooMike]

Same basic idea as the Fairbanks-Morse engines used in some submarines during WWII. They were 5 cylinder units - cranks were slightly out of phase with each other with the crank connected to the generators putting out more power than the crank attached to the blower.

Yup, used in diesel locomotives. Main difference here is the Fairbanks-Morse diesel engines had 2 crankshaft, an upper and a lower one. Whereas this one has a common crank.

I wonder how all those extra connecting rods for the opposite piston, reciprocating mass/balancing all will work out under higher speeds ?

Mike