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Scottty

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If you put 3000 watts into a laser, expect to take 2000 watts coming right back out as heat.
But don't worry, the OpFor will just sit there and get laser'd. They totally won't do obvious things like sending some missiles back at your suddenly very obvious heat signature.
 

Scottty

Well-known member
Founder
On warships chill water is used to cool weapon systems. Including the barrels of guns. The same will be done for lasers.

Which is fine for a ship floating on top of loads and loads of that useful coolant.
Not so applicable to an airplane.
 

Scottty

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Founder
In fact, 33% efficiency (getting 1 watt of laser energy for every 3 watts pumped in) is a lot better than I was lead to understand is the case with lasers.
 

Marduk

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Which is fine for a ship floating on top of loads and loads of that useful coolant.
Not so applicable to an airplane.
Aircraft get free high powered air cooling instead. Some WW2 planes used that as the only cooling for their engine.
 

bintananth

behind a desk
Aircraft get free high powered air cooling instead. Some WW2 planes used that as the only cooling for their engine.
Some? The overwhelming majority of aero engine designs are air cooled. It's always been that way.

Pros: weight, simplicity, reliability
Con: increased drag
 

paulobrito

Well-known member
Some? The overwhelming majority of aero engine designs are air cooled. It's always been that way.

Pros: weight, simplicity, reliability
Con: increased drag
Not so fast - many use liquid-cooled engines - all the V and H type engines are liquid-cooled, and the radial are the ones that are air-cooled.
 

Marduk

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Staff Member
Some? The overwhelming majority of aero engine designs are air cooled. It's always been that way.

Pros: weight, simplicity, reliability
Con: increased drag
Many piston engines are liquid cooled, like in Spitfire or Me-109. Jets and turbojets tend to be cooled enough by their intake air alone, due to the sheer amount they need to flow through them.
 

paulobrito

Well-known member
Hurricane, Spitfire, Me/Bf-109, FW-190D, P-51, Mosquito, Lancaster, P-40, P-38, Ju-87, MiG-3, LaGG-3, Yak series, Ki-61, He-111, etc, etc.
All liquid-cooled engines.
 

bintananth

behind a desk
Not so fast - many use liquid-cooled engines - all the V and H type engines are liquid-cooled, and the radial are the ones that are air-cooled.
I didn't say all.

Many piston engines are liquid cooled, like in Spitfire or Me-109. Jets and turbojets tend to be cooled enough by their intake air alone, due to the sheer amount they need to flow through them.
Once the bugs with radials were worked out liquid-cooled inlines mostly got relegated to applications where speed was paramount ... like the Spitfire and Bf-109 (i.e.: fighters).
 

paulobrito

Well-known member
LOL, and how many tens of thousands of fighters with liquid-cooled engines are produced during WW2?
Almost all of the British Bombers, half of the German ones, and almost all Soviet bombers also used liquid-cooled engines.

Relegated, indeed...
 
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Zachowon

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They had the added effect of also being air cooled along with thier liquid collant
 

bintananth

behind a desk
LOL, and how many tens of thousands of fighters with liquid-cooled engines are produced during WW2?
Almost all of the British Bombers, half of the German ones, and almost all Soviet bombers also used liquid-cooled engines.

Relegated, indeed...
Those were military aircraft during wartime. The budget was "somebody else's problem" and "yes".

EDIT: Civilian aircraft designs almost never use liquid-cooled engines. To airline execs and private pilots shaving a few minutes off a flight isn't worth the increased cost.
 
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Scottty

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"Air-cooled" means "heats up the air around it" which means "leaves trail of hot air behind it" which means "not stealthy".

 

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