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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet temp in flight
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<blockquote data-quote="DMP25-06" data-source="post: 2646355" data-attributes="member: 27271"><p>Well , I am NOT an aeronautical engineer , and I have no means to test bullets to determine accurate results , so I will use a comparison of a KNOWN object being tested as a comparison , that seems logical to me .</p><p>However , people often accuse me of having twisted logic .</p><p></p><p>The SR-71 Spy plane had a published top speed of 2193 MPH which equals 3216.4 FPS .</p><p>That speed was not instantly achieved , it was attained after several minutes of flight .</p><p>According to Lockheed Aircraft , designer and builder of SR-71 , the temperature of the nose of the airplane at 2193 MPH was approximately 800*F , and at the windshield it was 600*F .</p><p>According to documents that I looked-up , this was not due to friction of airflow over surface of the airplane , but instead was due to compression of the air molecules in front of the aircraft at that speed .</p><p></p><p>So , in my twisted logic , I think that the 800*F temperature would be the highest possible temperature that a bullet might attain at 3216 FPS velocity , and that would be after several seconds of flight time at a CONSTANT 3216 FPS , not a constantly decelerating curve of velocity .</p><p></p><p>In my opinion , the original Ballistic Tip , the Sirrocco tipped bullet , the A-Max , and the Tipped Match King bullets had no problems with plastic tip deformation , and the "New ELD tip" was strictly marketing .</p><p></p><p>Years ago , while hunting in the mountains of Colorado , I found a .30 caliber 165 gr. spitzer-style bullet , with exposed lead-tip , that had been fired from a rifle , probably .30-06 or .308 , that had fallen to earth without striking any object , other than the earth when it landed .</p><p>The lead tip was not melted , only scuffed , and one side of the copper jacket was scuffed and somewhat flattened from hitting the dirt and skidding .</p><p>That lead tip had not melted , so it makes me question how hot it got , since lead has a melting point of 621.5*F .</p></blockquote><p></p>
[QUOTE="DMP25-06, post: 2646355, member: 27271"] Well , I am NOT an aeronautical engineer , and I have no means to test bullets to determine accurate results , so I will use a comparison of a KNOWN object being tested as a comparison , that seems logical to me . However , people often accuse me of having twisted logic . The SR-71 Spy plane had a published top speed of 2193 MPH which equals 3216.4 FPS . That speed was not instantly achieved , it was attained after several minutes of flight . According to Lockheed Aircraft , designer and builder of SR-71 , the temperature of the nose of the airplane at 2193 MPH was approximately 800*F , and at the windshield it was 600*F . According to documents that I looked-up , this was not due to friction of airflow over surface of the airplane , but instead was due to compression of the air molecules in front of the aircraft at that speed . So , in my twisted logic , I think that the 800*F temperature would be the highest possible temperature that a bullet might attain at 3216 FPS velocity , and that would be after several seconds of flight time at a CONSTANT 3216 FPS , not a constantly decelerating curve of velocity . In my opinion , the original Ballistic Tip , the Sirrocco tipped bullet , the A-Max , and the Tipped Match King bullets had no problems with plastic tip deformation , and the "New ELD tip" was strictly marketing . Years ago , while hunting in the mountains of Colorado , I found a .30 caliber 165 gr. spitzer-style bullet , with exposed lead-tip , that had been fired from a rifle , probably .30-06 or .308 , that had fallen to earth without striking any object , other than the earth when it landed . The lead tip was not melted , only scuffed , and one side of the copper jacket was scuffed and somewhat flattened from hitting the dirt and skidding . That lead tip had not melted , so it makes me question how hot it got , since lead has a melting point of 621.5*F . [/QUOTE]
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Bullet temp in flight
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