How a radial engine works
 

As explained by a carpenter...

Part 1:



Part 2:

Totally awesome!
:D:D:ok:
Thanks for the links.

Nice work!

He forgot to add the caveat that it's four-stroke, single-row radials that require an odd number of cylinders. Two-strokes can deal with even numbers (and odd numbers)

He did a great job with that - both in making the model and explaining it. The clearest explanation of the principles of a radial I've ever seen, in fact. :ok:

I bet that engine woodn't run too good. :)

It wouldn't last. Like an Irish wood stove.http://cdn.pprune.org/images/smilies/badteeth.gif

Anyway the valve guides wood probably GUM up.http://cdn.pprune.org/images/smilies/boohoo.gif

Sorry. Too much unwooded chardonay..http://cdn.pprune.org/images/smilies/evil.gif

You could always run it lean of teak though.

Seeing as he's a carpenter, where's his plane?

If God had intended internal combustion engines to be horizontally-opposed, Pratt and Whitney would have built them that way!

You guys are just going around in circles... you can't see the wood for the trees ;)

I enjoyed watching that.

Sorry to lumber you jokers witha BMOS, but does a twin row run 1 cam ring or two?

Jas

Superb job.

The timbre of some of these posts is rotten.

Wow, dedicated carpenter.
Hat off..

While I am in no way any expert, and the carpenter mentioned in the second video that there are many variations, I would imagine that in a twin/triple/quad row engine, there would be a cam ring set to each row, as essentially the engine is being extended by just adding another complete set of cylinders (and operating mechanisms) on to the front of the existing ones.
Looking at this image:https://en.wikipedia.org/wiki/Pratt_...p_R-2000_2.jpg it shows the front row's pushrods are actuated from the front of the engine and the rear row's (judging by the orientation of its rocker covers) are actuated from behind it, so needing two cam rings.

Edit: here's a better picture of a four row cutaway. You can see each row has a cam ring https://en.wikipedia.org/wiki/Pratt_...ry_cutaway.jpg, although between row ones are shared, which means that effectively each row has a cam ring on each side, driving either inlet or exhaust valves.

Is it a Wasp or a Tiger?