Opposed tank engine

[quattro]

I'm not opposed to tank engines, in fact I've been for a drive in one today



yes, that is me driving it.

Thing is, in the museum bit, they had this: -



Twin crank, one at the top and pistons meeting (well not quite) in the middle. Heard of them, but never actually seen one before

 

[harveyp6]

The Main Stealer I worked for had a complete P6 cutaway like that. I assume it was a Motor Show exhibit.

 

[unstable load]

I'm not opposed to tank engines, in fact I've been for a drive in one today

View attachment 17231

yes, that is me driving it.

Thing is, in the museum bit, they had this: -

View attachment 17232

Twin crank, one at the top and pistons meeting (well not quite) in the middle. Heard of them, but never actually seen one before

View attachment 17234

OPOC is one of the names given to the idea, Opposed Piston, Opposed Cylinder.
A famous engine of this layout was the Junkers Jumo series, which were the first successful Diesel aero engines, developed in the 1930s.