You have GOT to be kidding me

[Rubberchicken]

But the boxer's no screamer, that's more like an old bomber, the airhead at least.

Every so often a Catalina flies overhead here. Dead slow, a pair of droning radials. Lovely sound... (The accompanying spittie is something else, though )

Had a go in an An-2 once. Big radial engined biplane. That thing is mental. Sick bags were provided...

[nomad]

But the boxer's no screamer, that's more like an old bomber, the airhead at least.

Every so often a Catalina flies overhead here. Dead slow, a pair of droning radials. Lovely sound... (The accompanying spittie is something else, though )

Had a go in an An-2 once. Big radial engined biplane. That thing is mental. Sick bags were provided...

would love to have had a flight in one of those







had a flight in one of these








not rotary engined but an experience all the same

[Lumiya]

The boxer engine is no radial as there needs to be a minimum of 3 to be counted as a radial, instead the boxer is counted as a flat twin. The modern radials and especially rotaries are more screamers than the older ones, amazing for engines that were basically designed 80+ years ago and still use push-rods (Jenna and I were trying to think of designs that would use a camchain and could only come up with a long chain around the whole circumfrance which would be a pain to time up)

Also going away from radials and onto rotaries can anyone answer a simple question?

You see from my animated gif that the concentric movement of the piston allows compression against the piston face, but what keeps the compression in check on the top and bottom faces???? 13uggered if Jen or myself can figure it out....best Jen could come up with is just a flat finished face on piston and crankcase but tollerances and finishes would have to be amazing for that to work???

[Steve C]

...snip someone is going to post saying they thought "screamers" meant something else

I've often wondered about screamers... now I know

[VTwin]

Quote "but what keeps the compression in check on the top and bottom faces???? 13uggered if Jen or myself can figure it out....best Jen could come up with is just a flat finished face on piston and crankcase but tollerances and finishes would have to be amazing for that to work??? "




There is no compression as such in the other chambers because there are no valves only ports. As the rotor moves around the chamber, each of the three volumes of gas alternately expands and contracts. It is this expansion and contraction that draws air and fuel into the engine, compresses it and makes useful power as the gases expand, and then expels the exhaust. The combustion chamber is machined into the rotor face.

[Rubberchicken]

would love to have had a flight in one of those

They do turn nicely:


It went from about that far over to the other side to here where the pic was taken in really very little time at all. Urp.