Testing Results |
First Day |
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Test #1 38mm Blue Thunder |
|
 | The first test was the 38mm grain. An Animal Motor Works 75/76000 case
was used as the test motor. |
 | This test resulted in zero thrust and zero pressure build up within
the core. |
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Test #2 25 grams thermite
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|
 | 72 pounds of thrust was developed for about 25 milliseconds. |
 | Estimated pressure was 28 PSI |
 | The ringing was due to test stand oscillation. |
 | This test represents about 1/2 the thermite Darren recommended, and
the same amount used in the Liberty Project |
|
 |
Test #3 32 grams thermite |
|
 | 150 pounds of thrust was developed for about 75 milliseconds. |
 | Pressure reading was 60 PSI |
|
 |
Live Motor Test |
|
 | Jeff Anesetti's Nike-Ajax was used in the all up motor testing of the
thermite. |
 | 3.0 grams for thermite and two Daveyfire 28F (not dipped) igniters
were used for each motor. Additional motor prep included sanding
with 60 grit paper all grain surfaces. |
 | Jeff's rocket used five K1275 REDLINE motors with the newly redesigned
single throat nozzle. These nozzles easily allowed the thermite package to
be insert 2/3 of the way into the motor. |
 | Show to the right are two consecutive frames of a digital video
camera. At 30 frames per second this represents an elapsed time of
33 milliseconds. |
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Second Day |
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Test #4 50 grams thermite |
|
 | 275 pounds of thrust was developed for about 75 milliseconds. |
 | Pressure reading was 150 PSI |
 | Overall a very sharp rise and fall in pressure |
|
 |
Test #5 100 grams thermite |
|
 | 275 pounds of thrust was developed for about 100 milliseconds. |
 | Pressure reading was 130 PSI |
 | Overall a very sharp rise with a sustained value and then dropping off
quickly. |
 | Large amount of slag was left in the motor. |
|
 |
Test #6 J-350 Motor |
|
 | Aerotech sponsor the last test. A thrust measurement of a standard
J-350 motor. |
 | The test used 1.5 grams of thermite which is twice the calculated
amount. |
 | The thrust curve shows the motor coming up to pressure in 25
milliseconds with no over-pressurization. |
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Other Tests |
|
 | Neil McGilvray lit his O motor with an internal core structure similar
to the Black Brant "P" motor. |
 | Neil used 25 grams of thermite to light this motor. |
 | Watch the video carefully, there seems to be no startup time, the
motor goes from off to full pressure instantly. |
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Omotor.wmv |
Credits |
|
 | The Black Brant team would like to thank the following people: |
 | Bill Seiders for the use of his test stand. |
 | Gates Brothers Rocketry for the use of their AMW 75/7600 motor case. |
 | Aerotech rocketry for their donation of a J-350 motor. |
 | Jeff Anesetti for allowing this to be done on a live rocket. |
 | Bill Seiders, Buck Gomez, Jimmy Oldham, and Rick Dickinson for their
help in performing these tests. |
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