22886
Topic Author
Posts: 387
Joined: Fri Mar 16, 2001 6:50 am

Why The Black Dot On The Nose Cone?

Thu Jul 26, 2001 4:56 am

Why did most airliners in the 70's and 80's have a black dot on the nose cone or a black nose cone with a black patch under the cockpit?

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Photo © Eduard Marmet



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Photo © Jörg Tegen


Why does Alitalia still have the black dot on the nose?cone?

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Photo © Luis Rosa


 
flight152
Posts: 3211
Joined: Fri Nov 24, 2000 8:04 am

RE: Why The Black Dot On The Nose Cone?

Thu Jul 26, 2001 5:07 am

The black patch over the cockpit was anti-glare paint to keep the sun out of the pilots eyes. You don't see it anymore because it is not "pretty".
 
Notar520AC
Posts: 1517
Joined: Sat Jul 21, 2001 6:53 am

Radome

Thu Jul 26, 2001 5:34 am

The reason for the balck instead of the silver paint on the first photo is becuase you cannot paint a metallic paint over the radome. For some reason it affects the radar so most airlines paint it a different color than the base color if the paint is metallic.

-Notar520AC
BMW - The Ultimate Driving Machine
 
Guest

RE: Why The Black Dot On The Nose Cone?

Thu Jul 26, 2001 5:38 am

According to the instructors in two different weather radar courses that I have attended, it had to do with the transmissivity (electronic transparency) of the radiomen. Up until the 1980's, the typical paints used on aircraft had very poor radar transmissivity. The paint which had the best properties for the radar just so happened to be black (or I think, gray). Now days, the paint manufacturers have improved their products to the point where it isn't a big factor anymore and you can paint radomes in just about any color.