Alan wrote:
In article writes:
Jay,

Effectively enough? I would guess so, but it'd be nice to be sure.
Well, to answer that question you'd need to start with conclusive evidence that
there is such a thing as shock cooling in air-cooled engines. You won't find it
and many people having learned and forgotten more stuff about engines than I
will ever know doubt very much it exists. That siad, yes, it is commonly
accepted that shock cooling is not an issue in liquid-cooled engines.

It was my understanding that the Rotax had liquid cooling of the cylinder
heads, and air cooling of the cylinders. That wouold leave something to
shock cool.

Rotax 4-stroke owners, of which I'm one, are
not generally concerned with shock cooling.
I've probably done 50 simulated emergency
landings from altitude with no issue or concern.

My off-the-cuff engineering evaluation would be
that since the cylinders, being cylindrical, will
expand and contract in a symmetrical fashion,
minimizing the stress.


Perhaps these engines are less sensitive than a tubercharged TIO-550...

Alan