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Focke-Wulf swept-wing pusher fighter with contra-rotating propellers

blackkite

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I believe that "0310.025.-509" did not have a forced cooling fan for the radiator.
You can see rectangle shape four radiator outlet air nozzle at upper and under the fuselage.
Troublesome design. If this design had additional jet engine same as "P.1310251-13/II", no problem.
Use only jet engine at taxing to avoid engine over heat.
 

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hesham

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From Le Fana 217.
 

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blackkite

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riggerrob

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As the engine was to be relatively far aft, I'm wondering if chosing the swept wing
was purely for aerodynamic reasons, or maybe just for getting the CG in correct place ?
Good point Jemiba,
Balance is a huge problem on single-engines pushers ... and I as we discussed over on the Japanese Shinden and Senden and Luke threads. Heavy engines need to be mounted near the centre of gravity, by propellers need to be mounted aft of the trailing edge.

I could write an entire chapter about “Seabee” configuration flying boats.
 
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blackkite

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Hi!
Focke-Wulf drawing 0310 025-506 Jäger mit Jumo 222 E-F.
I can see radiators with air intake fan in every side view.
 

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blackkite

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The Focke-Wulf propulsion propeller fighter design proposal P.0310 025-506 is considered to be an early design proposal of the propelling propeller fighter design proposal P.0310 025-509 equipped with the same engine.
P.0310 025-506 has a fan that takes in air that cools the radiator, but P.0310 025-509 does not have a fan.
Without a fan installed, overheating will occur during engine ground operation.
I think that the following measures are taken in P.0310 025-509 to prevent overheating of the engine.
1. The radiator size has been expanded. The radiator of P.0310 025-506 is two pieces that are divided into upper and lower parts and are in the shape of a partial arc, but the radiator of P.0310 025-509 is four pieces of X type.
2. While the engine on P.0310 025-509 is running on the ground, it may be cooled by directly watering it with a hose to the radiator. Alternatively, there may have been a radiator-assisted water spray system built into the airframe.
 

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Wurger

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2. While the engine on P.0310 025-509 is running on the ground, it may be cooled by directly watering it with a hose to the radiator. Alternatively, there may have been a radiator-assisted water spray system built into the airframe.
Good insight, Blackkite! We should know better, though, on the radiator cooling system. I have no factual/documental evidence on that.
 

riggerrob

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Spraying water on radiators makes sense.
Consider that P-51s racing at Reno Nevada have spray bars installed to help radiators when finely-tuned Merlins to produce double the horsepower of stock engines. They pump some much water/methanol that they leave thick vapour trails!
 

blackkite

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Thanks a lot gentlemen. Excellent informations.
 

blackkite

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Hi! Focke Wulf some pusher fighters. Almost same scale.
Radiator concept of P.0310.251-22 fighter is same as P.0310.025-509 fighter. No cooling fan.

Perhaps P.0310.025-1006 fighter front radiator had a electric drive variable pitch cooling fan for engine ground operation.
 

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blackkite

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I think that this Dornier fighter design also needs water spray to the radiators at engine ground operation.
Drawing source : SPF
 

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