A Focke Wulf 190D Dora had a real ram air scoop for its
Jumo 2000 HP 212E V12 engine. It also used ring radiators
inside the cowl with nice cowl flaps.

Paul Lamar

What do you think of the efficiency of the annular inlet (around the
spinner - as FW-190)
as compared to a conventional scoop?  It seems to me it would have
higher drag than a
conventional scoop of the same effective area - more drag area...  Same
thing for anular
exhaust on a pusher config.  I find it interesting the FW got that
inlet.  On a radial engine,
it makes sense, however.

Regards,

Matt-

Not according to Hoerner. Those are low drag numbers.
The big problem is making the ring  radiators and the starter interference.
Another problem is ground taxi cooling and climbing out at low speeds.
You will get more benefit from the prop slip stream if the intake
is further out from the hub.

Paul Lamar

On second thought those large cowl flaps being 360 degrees are going to
help cooling on both ground taxi and climb out.

Paul Lamar
 
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