Differences

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--- projects:splat [2020/11/18 10:24] – [Super Pressure Musings] rocketboy
+++ projects:splat [2023/02/19 12:10] (current) – [Project aim] rocketboy
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 Currently the project is in the balloon testing phase - test rig with 10Kpa differential pressure sensor constructed and used to burst test a balloon.
+This Project dates from around 2010.
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 ==== Test Balloons ====
-The 36” Qualatex balloons to be used have a mass of 37g and have a measured volume of approx. 0.10 (measured by helium lift) to 0.11cu m (measured by water fill) when nicely "full".  Two balloons have been pressure tested - the first with a manometer the second with a pressure sensor MPX5010.  The results were burst at about 4.7Kpa (0.7PSI) and 5.4Kpa (0.8PSI) respectively.
+The 36” Qualatex balloons to be used have a mass of 37g and have a measured volume of approx. 0.10 (measured by helium lift) to 0.11cu m (measured by water fill) when nicely "full" (i.e. not yet stretched).  Two balloons have been pressure tested - the first with a manometer the second with a pressure sensor MPX5010.  The results were burst at about 4.7Kpa (0.7PSI) and 5.4Kpa (0.8PSI) respectively.
 [[http://www.youtube.com/watch?v=hr6x3r8phvE]]
-Testing suggests volume increases by about 33% at burst (due to stretch). Both tests resulted in a diagonal rips - see pictures.
+Testing suggests volume increases by about 33% - 50% at burst (due to stretch). Both tests resulted in a diagonal rips - see pictures.
 {{:projects:balloonburst.jpg|}}{{:projects:2ndburst.jpg?406|}}