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DIY LED landing light -- Wing skin as heat sink?

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nuckolls.bob(at)aeroelect
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Posted: Sun Nov 01, 2020 9:07 am Post subject: DIY LED landing light -- Wing skin as heat sink?

 	  Quote: 	
		  



 Trying to wrap my head around the transition from flat contact area under the LED chip to the heat sink plate as it expands out in area. Seems mounting it to an infinite piece of alum foil would not be the same as mounting it to 10x10" 0.063" thick alum plate .. 	


   But the sheet has thermal resistance too. And

   rate of dissipation is a function of temperature

   differential. As you move out onto the sheet,

   the fastest transfer is right around the base

   of the LED; temperatures fall as you move

   out hence energy dissipated per unit area 

   declines.



   Intuitively, it makes sense that 'sink'

   temperature at the base of the LED will

   be much higher than at a remote location.



   Are we talking about landing lights?



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Nov 02, 2020 8:12 am Post subject: DIY LED landing light -- Wing skin as heat sink?

At 04:32 AM 11/2/2020, you wrote:

  	  Quote: 	
		  I though about mounting a computer (CPU) fan over the fins to give a flow of air, but this idea falls down if your lights ‘wig-wag’ !!! 	


   Perhaps not . . . during wig-wag operations, energy

   to the fan is cut in half which severely reduces

   its output but . . . energy dumped by the lamps

   is cut in half too. Might not be a big deal. You

   need to prototype it and take some MEASUREMENTS.



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Nov 02, 2020 8:12 am Post subject: DIY LED landing light -- Wing skin as heat sink?

At 08:08 PM 11/1/2020, you wrote:

  	  Quote: 	
		    https://electronics.stackexchange.com/questions/294583/does-heatsink-transfer-plate-thickness-matter 



 I think the 4th answer down give the answer.  Draw out the path of where you are inputting the heat (back of the module), to where air starts flowing over it.



 If it were me, I'd mount it on an 0.80 or 0.90 plate and tape a thermocouple on the back.  Maybe set a fan in front to simulate the prop turning.  If not cool enough, use a thicker plate, or drill more holes.



 	


  Bingo . . . MEASURE on the bench 



 

 

   Bob . . .

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