Max Diff........plus ......er....10?
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Apologies if you've already seen this, but this is what happens if you do a pressurisation run with the outflow valves blanked and use a homemade guage without a max. indicator stop. Fortunately no one was injured.
http://people.ne.mediaone.net/glider...3_image004.jpg
http://people.ne.mediaone.net/glider...3_image004.jpg