Radial Engine Cutaway

[CC268]

Thought this was pretty cool. Found it on Skip Stewart’s FB

https://www.facebook.com/SkipAirshows/posts/10211333692635207

 

[SoonerAviator]

Lol, I want to know how loud that thing is while rotating.

 

[AggieMike88]

That idea would make an interesting clock

 

[Pilawt]

Feng shui for flyers ...

 

[Morgan3820]

I don't know why but it looks almost, kinda pornographic...

But then I am not normal..

 

[Stingray Don]

I’m pretty sure my wife would veto that idea for our house

 

[Sac Arrow]

Nine rods, one crank. Almost sounds like a gay porno.

 

[hawk25u]

 

[Tom-D]

Why do all single row radial engines have odd number of cylinders?

 

[SkyDog58]

I don't know why but it looks almost, kinda pornographic...

But then I am not normal..

No one said you were.

 

[Cap'n Jack]

Why do all single row radial engines have odd number of cylinders?

Some single row radial engines have an even number of cylinders.

 

[CC268]

Why do all single row radial engines have odd number of cylinders?

How much wood does a wood chuck chuck?

 

[robert lomax]

Why do all single row radial engines have odd number of cylinders?

Each row of every radial engine needs to have an odd number of cylinders,, else they wont work!

 

[Greg Bockelman]

Why do all single row radial engines have odd number of cylinders?

So the firing order works out. 1 3 5 7 9 2 4 6 8

Or should I have recused myself?

I suspect the 4 cylinder single row radials fire the opposing cylinders simultaneously.

 

[robert lomax]

Some single row radial engines have an even number of cylinders.

Can you name any?

The only way an even number radial cold work, is if all cylinders fired in sequence, for 1 revolution,,
and then the the cylinders would all intake in sequence, for the next revolution...
Repeat ...

Would make for a very rough running engine!

 

[robert lomax]

So the firing order works out. 1 3 5 7 9 2 4 6 8

Or should I have recused myself?

I suspect the 4 cylinder single row radials fire the opposing cylinders simultaneously.

You are quite right,, except that since their is only 1 crank throw,, their cant be but 1 cylinder at top dead center at a time...

 

[Cap'n Jack]

Can you name any?

The only way an even number radial cold work, is if all cylinders fired in sequence, for 1 revolution,,
and then the the cylinders would all intake in sequence, for the next revolution...
Repeat ...

Would make for a very rough running engine!

Nordberg (12 cylinders), Clerget 14D (14 cylinders, single row), Zoche (4 cylinders)

 

[Cap'n Jack]

So the firing order works out. 1 3 5 7 9 2 4 6 8

Or should I have recused myself?

I suspect the 4 cylinder single row radials fire the opposing cylinders simultaneously.

Nope.

 

[Tarheelpilot]

The only even number single row I’ve ever seen was an ingersol rand radial air compressor. 3 cylinders were combustion cylinders and the other three were air compressor cylinders. I have only seen one in person.

 

[robert lomax]

Nordberg (12 cylinders), Clerget 14D (14 cylinders, single row), Zoche (4 cylinders)

OK!! ya got me, they can have even numbers...
IF they are 2 cycle!!! All your examples are....

Guess I just didnt think this through far enough...

 

[Greg Bockelman]

Nope.

Ok, this is true.

So I could see a 2 stroke working.

 

[Greg Bockelman]

Simultaneous posts, I guess.

 

[robert lomax]

Ok, this is true.

So I could see a 2 stroke working.

Just for fun,, a revisit to the OP,,,
that is a beautiful piece of wall art!!!

 

[Greg Bockelman]

Just for fun,, a revisit to the OP,,,
that is a beautiful piece of wall art!!!

No kidding. I have a wall for one of those.

 

[Tom-D]

Each row of every radial engine needs to have an odd number of cylinders,, else they wont work!

Why won't it work?

 

[Tom-D]

You are quite right,, except that since their is only 1 crank throw,, their cant be but 1 cylinder at top dead center at a time...

Your lawn mower is a 1 cylinder radial.

 

[Tom-D]

You are quite right,, except that since their is only 1 crank throw,, their cant be but 1 cylinder at top dead center at a time...

there never is in any multi cylindered engine.

 

[Tom-D]

The only even number single row I’ve ever seen was an ingersol rand radial air compressor. 3 cylinders were combustion cylinders and the other three were air compressor cylinders. I have only seen one in person.

Then it was a 3 cylinder engine, and a 3 cylinder compressor

 

[Tom-D]

You are quite right,, except that since their is only 1 crank throw,

Multi row radials have a crank throw for each row.

 

[asicer]

You are quite right,, except that since their is only 1 crank throw,, their cant be but 1 cylinder at top dead center at a time...

there never is in any multi cylindered engine.

Don't confuse TDC with the firing stroke. In an inline 4, for example, 2 cylinders can be at TDC but only 1 of them will be igniting.

 

[Tom-D]

Don't confuse TDC with the firing stroke. In an inline 4, for example, 2 cylinders can be at TDC but only 1 of them will be igniting.

How many crank throws does a 4 cylinder in line have?

Were talking Radials,

How many revolutions does it require to fire all cylinders in any 4 stroke engine?

 

[asicer]

Were talking Radials

OK, sorry. I thought "any multi cylindered engine" meant any multi cylindered engine.

 

[Tom-D]

OK, sorry. I thought "any multi cylindered engine" meant any multi cylindered engine.

It did. I mis spoke saying "any"

 

[Tom-D]

How many revolutions does it require to fire all cylinders in any 4 stroke engine?

This question is key to understanding why all Radial engines have odd number of cylinders per row.

 

[Tarheelpilot]

Then it was a 3 cylinder engine, and a 3 cylinder compressor

Yes. That’s what I said.

 

[Cap'n Jack]

This question is key to understanding why all Radial engines have odd number of cylinders per row.

Not ALL radial engines have odd numbers of cylinders per row. There were three examples of radial engines with an even number of cylinders per row listed earlier in this thread.

You were involved in a similar discussion here too, where even-number-cylinder-per-row radial engines were discussed.
https://www.pilotsofamerica.com/community/threads/6-cylinder-radial.42111/

 

[Sac Arrow]

Odd number cylinders run more smoothly in inlines (and V's and opposed) as well. A six is not a four with two cylinders added on. It is a pair of threes.

 

[Tom-D]

Yes. That’s what I said.

so, what would be the firing order?

 

[SkyDog58]

Awesome! It would be so cool to have that on a wall at the house. Not sure if the wife would go for it though.

 

[Cap'n Jack]

so, what would be the firing order?

Assuming the compressor and driving cylinders alternate each other, and the usual numbering clockwise, and the first cylinder being a driver:
1, 3, 5