View Full Version : How a radial engine works
As explained by a carpenter...
Part 1:
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Part 2:
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DirtyProp
27th Aug 2016, 18:25
Totally awesome!
:D:D:ok:
Thanks for the links.
Andy_RR
28th Aug 2016, 04:55
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)
ShyTorque
28th Aug 2016, 09:40
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:
onetrack
28th Aug 2016, 09:51
I bet that engine woodn't run too good. :)
rutan around
28th Aug 2016, 10:02
It wouldn't last. Like an Irish wood stove.http://cdn.pprune.org/images/smilies/badteeth.gif
rutan around
28th Aug 2016, 10:08
Anyway the valve guides wood probably GUM up.http://cdn.pprune.org/images/smilies/boohoo.gif
rutan around
28th Aug 2016, 10:11
Sorry. Too much unwooded chardonay..http://cdn.pprune.org/images/smilies/evil.gif
triton140
28th Aug 2016, 22:13
You could always run it lean of teak though.
ShyTorque
28th Aug 2016, 22:25
Seeing as he's a carpenter, where's his plane?
Capn Bloggs
29th Aug 2016, 00:23
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 ;)
jas24zzk
29th Aug 2016, 10:14
I enjoyed watching that.
Sorry to lumber you jokers witha BMOS, but does a twin row run 1 cam ring or two?
Jas
oggers
29th Aug 2016, 10:43
Superb job.
rutan around
29th Aug 2016, 20:54
The timbre of some of these posts is rotten.
TowerDog
30th Aug 2016, 00:05
Wow, dedicated carpenter.
Hat off..
Traffic_Is_Er_Was
30th Aug 2016, 02:03
does a twin row run 1 cam ring or two?
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_%26_Whitney_R-2000_Twin_Wasp#/media/File:PrattWhitney_Twin_Wasp_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_%26_Whitney_R-4360_Wasp_Major#/media/File:Biggest_rotary_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.
Band a Lot
30th Aug 2016, 03:28
Is it a Wasp or a Tiger?