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Ducted prop-spinners
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After dragging the Gnome Engine thread off topic long enough with these, I figure we should have a special thread on them.

Below is the Northrop A-17 with ducted and streamlined prop-spinners:



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1-3.) Curtiss XP-42 cooling system:

4-9.) Focke-Wulf samples



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1.) Bristol M.1C

2-3.) Hawker Tempest MkV NV768

4-6.) Renard R.37 cooling system

7-9.) Focke-Wulf 187 ducted spinners



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1.) Arado Ar 240 A-10 

2-3.) Messerschmitt Bf 109 H

4-6.) Me 209 V4

7.) 5-engine B-17 with one ducted prop. It was used as a testbed for the Wright XT-35 Typhoon engine.

8-10.) More of the Renard R.37



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i think i have seen this somewhere before, i think the Japanese Zero uses the same concept

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Actually it was to do both. While normally you'd have a duct below and behind the propeller, the ducted prop attempts to replace it, allowing air to travel straight to the engine while reducing drag on normal configurations.



-- Edited by Sidewinder on Monday 12th of March 2012 09:27:48 PM

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I'm answering to both Justin and SuperStallion's comment in the Gnome Engine topic here...

The Japanese did not have any equivalent streamlining or air-cooling method such as the ducted prop, however Great Britain and Germany have experimented with these methods (as evident by Stingray's attached pics).

They didn't work at all. If anything they made matters much worse.

 
 
 


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There some mixed info here, as the ducts were not for cooling purposes but for reducing drag.



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retroistic wrote:

There some mixed info here, as the ducts were not for cooling purposes but for reducing drag.


 

I think the mix-up came from Stingray including diagrams of the Curtiss XP-42 cooling system, which doesn't fit this thread at all! evileye



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Sidewinder wrote:

I'm answering to both Justin and SuperStallion's comment in the Gnome Engine topic here...

The Japanese did not have any equivalent streamlining or air-cooling method such as the ducted prop, however Great Britain and Germany have experimented with these methods (as evident by Stingray's attached pics).

They didn't work at all. If anything they made matters much worse.


 

Thanks for clarifying if Japan had similar trials or not.

Though, some of these actually did work, great in fact. But as I said in the other thread, what really killed the idea was the fact it caused to much of a problem for engine maintenance. Not to mention it was expensive to produce.

Yes there were a few others that were either redundant to their use, or caused engine cooling problems.

 
 
 


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What about the Mitsubishi J2M Raiden? I read somewhere that had an oil-cooling duct like these.



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Nothing out of the ordinary...



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