Testing 0.5 grams Goex FFFFg in 1/4" X 3/32" X 7/16" latex rubber tubing. This is quite a difference from the test with Titewad powder...
Testing 0.4 grams Titewad smokeless powder in 1/4" X 3/32" X 7/16" latex rubber tubing with my Perfectflite StratoLogger altimeter.
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