Radial Engine intakes

[Librarian]

Keep asking questions these days but something that has always interested me are the additional intakes seen on aircraft with radial engines. I know that these are usually for oil coolers and superchargers so I've always wondered why the radials on Ju88s and Fw190s don't seem to have them. The intakes must incur a drag penalty, so if these German designs did not have them why were they necessary on others?

I thought it might have something to do with the spinning fan behind the propeller. Would it be acceptable to have an aircraft with this spinning fan engine design and an oil cooler intake, mainly 'cos the combination looks good ?

[jcf]

The BMW 801 installation used an annular oil cooler that was mounted just behind the nose ring,
the supercharger intakes are inside the cowling and indeed the fan was part of what made it all work.

http://www.enginehistory.org/German/BMW/BMW801.pdf

The AEHS site is a good source for all kinds of engine info:
http://www.enginehistory.org

[Librarian]

Very useful information, many thanks. I'm using an engine egg that passes for a BMW with no discernible intakes but there are large intakes on both wings outboard of the engines....think I'll turn them into turbo inlets like on the JU388. Look good .

[rickshaw]

You have to remember that most German radial engines aren't radial engines.  They are inline engines with annular radiators, designed to fit the same cowling as the BMW 801.   This means they needed extra inlets sometimes for turbochargers and oil coolers.  The 801 had all it's inlets inside it's cowl.

[jcf]

You have to remember that most German radial engines aren't radial engines.  They are inline engines with annular radiators, designed to fit the same cowling as the BMW 801.   This means they needed extra inlets sometimes for turbochargers and oil coolers.  The 801 had all it's inlets inside it's cowl.

Actually all German radial engines were radial engines. 

The annular radiator equipped inline installations did not fit the same cowling as the 801, they were not
even close, and that was not the reason annular radiators were used, they were originally used, and promoted,
by Junkers because they fit better with the interchangeable power egg concept, which they had been pursuing
since the '30s with both radial and inline engine installations.

[Gondor]

You have to remember that most German radial engines aren't radial engines.  They are inline engines with annular radiators, designed to fit the same cowling as the BMW 801.   This means they needed extra inlets sometimes for turbochargers and oil coolers.  The 801 had all it's inlets inside it's cowl.

Actually all German radial engines were radial engines. 

The annular radiator equipped inline installations did not fit the same cowling as the 801, they were not
even close, and that was not the reason annular radiators were used, they were originally used, and promoted,
by Junkers because they fit better with the interchangeable power egg concept, which they had been pursuing
since the '30s with both radial and inline engine installations.

This was realised in at least two aircraft designs. The Ju 88 and the Do 217 families

Gondor

[zenrat]

Plug & play engines!

"Gunther!  The 801 today if you please"...

[tomo pauk]

This was realised in at least two aircraft designs. The Ju 88 and the Do 217 families

Gondor

The Do-217 never used annular radiators for it's V-12 engines, bar possible prototype(s).

You have to remember that most German radial engines aren't radial engines.  They are inline engines with annular radiators, designed to fit the same cowling as the BMW 801.   This means they needed extra inlets sometimes for turbochargers and oil coolers.  The 801 had all it's inlets inside it's cowl.

There was no German V-12 with turbocharger in ww2 in service.

I'm not sure whether I'll break a rule or two, so I apologize in advance - a tidbit on the intakes, among other stuff: https://ww2aircraft.net/forum/threads/on-big-radials.40758/page-2#post-1170411

[PR19_Kit]

There was no German V-12 with turbocharger in ww2 in service.

That doesn't mean there wasn't, or isn't one in WhiffWorld though.

That sort of thing is EXACTLY what we're all about here after all.

[tomo pauk]

No problems - the statement I've commented on looked RL to me.