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SVTPerformance's Chain of Restaurants
Road Side Pub
Science question of the day: Why was the SR-71 Blackbird painted black?
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<blockquote data-quote="James Snover" data-source="post: 16290169" data-attributes="member: 67454"><p>They didn't have them in the late fifties/early sixties. Everything about the Blackbird was special, and all of it was designed to manage heat, and they had to invent at least 75% of what went into the old girl.</p><p></p><p>The oil for the engines is one example: it was solid below 750F. It had to be preheated with torches before flight to get it into a liquid state. No gaskets sealing the fuel tanks. Nobody had any material that could take the range of temps. So she leaked, on the ground. The fuel: highly uninflammable. It had to be preheated before being fed into the combustion chamber to ensure ignition. So ... they also used it as coolant throughout the leading edge surfaces of the wings, and bingo: 2-for-1. Cooling the airframe, pre-heating the fuel.</p></blockquote><p></p>
[QUOTE="James Snover, post: 16290169, member: 67454"] They didn't have them in the late fifties/early sixties. Everything about the Blackbird was special, and all of it was designed to manage heat, and they had to invent at least 75% of what went into the old girl. The oil for the engines is one example: it was solid below 750F. It had to be preheated with torches before flight to get it into a liquid state. No gaskets sealing the fuel tanks. Nobody had any material that could take the range of temps. So she leaked, on the ground. The fuel: highly uninflammable. It had to be preheated before being fed into the combustion chamber to ensure ignition. So ... they also used it as coolant throughout the leading edge surfaces of the wings, and bingo: 2-for-1. Cooling the airframe, pre-heating the fuel. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Science question of the day: Why was the SR-71 Blackbird painted black?
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