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Bob Nuckolls - advice

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Wed Mar 16, 2011 12:27 pm Post subject: Bob Nuckolls - advice

Bob,  

        I realise I should test for myself, but thought it might apply to others:  

  I am using a DB25 female and male pair for quick disconnect to accommodate up to #18 wire runs for future circuits in my instrument panel.  [The whole panel OR each sub-panel is meant to be dismountable].   

  Since it will hold up to 12 + and – runs, I measured the male pins at 0.04 inches in diameter from the pack of 100, labelled as `S604P’. These are solid, not stamped pins and sockets.  

  Can I consider these to carry a constant 4 amps if not bundled tightly together? AND could I parallel  a set of three to carry a constant 10A in similar circumstances?  

        I would like to know I’m operating in a`conservative’ milieu and don’t plan to run cfuture equipment at greater than 10A.  

Cheers, Ferg  

            [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Wed Mar 16, 2011 7:43 pm Post subject: Bob Nuckolls - advice

At 04:16 PM 3/16/2011, you wrote:



  	  Quote: 	
		   Bob,

 

         I realise I should test for myself, but thought it might apply to others:

 

   I am using a DB25 female and male pair for quick disconnect to accommodate up to #18 wire runs for future circuits in my instrument panel.  [The whole panel OR each sub-panel is meant to be dismountable]. 

 

   Since it will hold up to 12 + and – runs, I measured the male pins at 0.04 inches in diameter from the pack of 100, labelled as `S604P’. These are solid, not stamped pins and sockets.

 

   Can I consider these to carry a constant 4 amps if not bundled tightly together? AND could I parallel  a set of three to carry a constant 10A in similar circumstances?

 

         I would like to know I’m operating in a`conservative’ milieu and don’t plan to run cfuture equipment at greater than 10A. 	


    That works. When I qualified paralleled d-sub pins

    onto this vehicle



  http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg



    I had to suffer the indignities of 70C environment at

    full electrical loads. I de-rated the pins to 3A, paralleled

    6 pins and handled three 20A input output pathways

    on this solid state relay box.



  http://aeroelectric.com/Pictures/Misc/GQM_Power_Dist.jpg



    So your suggestion of 3 pins to handle 10A is

    as conservative that which flies at Mach 3

    and 15 feet off the water. Things get really

    warm on the launch stand . . . and warmer still

    in flight through dense air.



    Just keep your airplane below M3 and I think

    you'll be just fine. I presume you understand

    the necessity for 'ballasting' resistors in the

    form of 12" of 22AWG in each pin path?



 

   Bob . . .    [quote][b]

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