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Merlini.a.f.
03-19-2004, 07:02 AM
somewhere i read that a well cowleled radial engine producead more thrust than darg. the air that entered the cowl gets heaten up by the engine and expands....basically something like the V1....
probably thats why th radials survived beyond ww2 unlike the liquid cooled engines...

Merlini.a.f.
03-19-2004, 07:02 AM
somewhere i read that a well cowleled radial engine producead more thrust than darg. the air that entered the cowl gets heaten up by the engine and expands....basically something like the V1....
probably thats why th radials survived beyond ww2 unlike the liquid cooled engines...

LEXX_Luthor
03-19-2004, 07:08 AM
In the old days if you want power and durability you go radial. If you want speed you go water cool engine.

After WAR if you want power and durability you go radial. If you want speed you go Jet.

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Merlini.a.f.
03-19-2004, 07:12 AM
good point, but still power=speed right???
with a few exceptions of course like the komet and the me262 http://ubbxforums.ubi.com/images/smiley/16x16_smiley-wink.gif

LEXX_Luthor
03-19-2004, 07:20 AM
Power does not equal speed at high airspeeds where drag rules.

Look at speeds of subsonic jet fighters, their speeds never increased with the addition of afterburners but their climb rates and acceleration doubled with afterburner power. So power is not speed. Power is climb and high gee maneuver power, and acceleration too but maybe not so much at higher airspeeds I dunno.

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"You will still have FB , you will lose nothing" ~WUAF_Badsight
"I had actually pre ordered CFS3 and I couldnt wait..." ~Bearcat99
"Gladiator and Falco, elegant weapons of a more civilized age" ~ElAurens
:
"Damn.....Where you did read about Spitfire made from a wood?
Close this book forever and don't open anymore!" ~Oleg_Maddox http://ubbxforums.ubi.com/images/smiley/16x16_smiley-surprised.gif

ELEM
03-19-2004, 07:24 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Merlini.a.f.:
somewhere i read that a well cowleled radial engine producead more thrust than darg. the air that entered the cowl gets heaten up by the engine and expands....basically something like the V1....
probably thats why th radials survived beyond ww2 unlike the liquid cooled engines...<HR></BLOCKQUOTE>

Quite right. The cooling of an aircooled engine is more complex that most imagine. The cylinders have to be shrouded to ensure even cooling around each. The cold air entering the intake takes up the heat from the engine and of course, expands. Therefore the exit for the hot air must be larger than the opening for the incoming cool air. This escaping air is controlled by the cowl flaps to maintain the engine at it's optimum operating temperature. This escaping air will be underpressure but contributes little in the way of useful thrust. This is of course the operating principle of a very crude jet engine

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