F-35 High Energy Laser

F-35 Armament, fuel tanks, internal and external hardpoints, loadouts, and other stores.
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glennwhitten

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Unread post04 Dec 2018, 23:51

spaz wrote: "The biggest obstacle remains the Corona effect. This occurs with power cables charged with extreme voltages at high altitudes. Those conditions mean the air around the cable becomes a conductive plasma, creating the conditions for a dangerous short circuit. Modern aircraft routinely fly at altitudes above 30,000ft where the Corona effect becomes most pronounced. Hybrid electric vehicles will need megawatt powers, meaning they will need to distribute the power from the generator to the motor along cables carrying hundreds of thousands of watts. No solution to the problem yet exists, but lightweight insulation materials may be promising."

Maybe they discovered the needed cable insulation for the Corona Effect at the University of Melbourne, a ceramic based cable insulator that is heat and fire resistant.

Electrical Cable Triggers Lightweight, Fire-Resistant Cladding Discovery
Tue, 11/20/2018 - 10:40am
by University of Melbourne

A University of Melbourne researcher has led the successful development of an organic, non-combustible and lightweight cladding core - a product that was previously thought to be impossible to create.

Typically, lightweight cladding is made from organic, carbon-based, composite materials like plastic, but these materials by their nature are combustible. Non-combustible materials like steel, ceramic tiles or concrete are much heavier and more expensive to produce and install.

University of Melbourne Fire Engineering Group research leader Kate Nguyen has discovered that the plastic insulation around electrical cables uses tiny ceramic particles that activate and chemically interact with each other, forming and spreading a heat resistant network through the material.
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castlebravo

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Unread post05 Dec 2018, 22:01

archeman wrote:
sferrin wrote:
spazsinbad wrote:...The biggest obstacle remains the Corona effect. This occurs with power cables charged with extreme voltages at high altitudes. Those conditions mean the air around the cable becomes a conductive plasma, creating the conditions for a dangerous short circuit. Modern aircraft routinely fly at altitudes above 30,000ft where the Corona effect becomes most pronounced. Hybrid electric vehicles will need megawatt powers, meaning they will need to distribute the power from the generator to the motor along cables carrying hundreds of thousands of watts. No solution to the problem yet exists, but lightweight insulation materials may be promising."


Wouldn't something like a shielded cable work? :?:


This Corona effect has always been an issue for radars. That is why they run in sealed pressure controlled boxes.


I suspect they will do the same with tactical laser weapon pods for fighters. They can have enough batteries/capacitors in the sealed pod to to fire it a few times, and then recharge it over time with lower voltage/power from the aircraft.

The "Killacycle" electric drag racing bike got 500+ HP out of a ~200lb lithium battery pack. 500 HP is ~373kw, so that should be good for a ~150kw laser assuming <50% efficiency, and at 9.7kwh of capacity, it would in theory be able to fire the laser for ~90 seconds. It may even be preferable to avoid the complexity of recharging in flight and just put enough battery in the pod to last an entire sortie.
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knowan

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Unread post10 Dec 2018, 23:59

castlebravo wrote:The "Killacycle" electric drag racing bike got 500+ HP out of a ~200lb lithium battery pack. 500 HP is ~373kw, so that should be good for a ~150kw laser assuming <50% efficiency, and at 9.7kwh of capacity, it would in theory be able to fire the laser for ~90 seconds. It may even be preferable to avoid the complexity of recharging in flight and just put enough battery in the pod to last an entire sortie.


Don't forget cooling; the energy that isn't going into the laser shot is almost entirely waste heat, which has to be dealt with somehow.
That will likely be some sort of active cooling system; if the laser is an isolated pod, that will cut into the power available for the laser.
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