Sunday May 27th 2007
Batch 5: 50g KNO3 - 25g Sugar - 9.6g Karo
Rocket tubes were sprayed with silicone in hopes of creating a removable fuel grain. This did not work. Three rocket tubes were filled and one was tested today. Ethan and I lit it off backwards and noticed a distinct difference between burning without a hole poked in the middle and burning with a hole in the middle. The rocket engines have a hole poked in the bottom 1/3 of the fuel grain to increase surface area for a faster burn. This fast burning period is for the liftoff and the rest of the fuel is for continued thrust once the rocket is airborne. When igniting it backwards we observed a very steady burn followed by a much more violent faster burn at the very end.
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