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Let me ask you this: how may tips are in a bucket? And: if a bucket has tipped all the way, can it tip some more?
Math
Rainfall is typically measured by two means. Manually, it is measured with a rain gauge. The automatic tool used is a Tipping Bucket rain gauge.
Irwin Yachts.
More info:
The specific model is the Irwin 68 Ketch.
Here is the interior plan and sail plan:
http://www.irwinyachts.com/Centercockpitfiles/I68//684.jpg
Irwin 68 Ketch.