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Some fun with sheet loads

Harken do a good job providing calculators for rigs. With my sail plan, it most closely approximates a genoa for load and so, though I knew the principle, the numbers were a bit daunting in black and white.

Here’s their blurb but I’m going to explain more simply below that:

sheet load

Sheet load in pounds is the equivalent of having a pulley attached to a ceiling beam, putting a rope through it, attaching one end to a load and the other end in your hand. It also depends on whether you’re pulling directly down on the rope from the pulley, directly up from the load or laterally.…

Mayflower

Via MicroDave:

http://www.techinsider.io/mayflower-autonomous-research-ship-to-sail-across-atlantic-2016-1

sd_drone_bow small

“A trimaran was chosen because it provides the most efficient hull form for low speed motoring,” John Shuttleworth, who runs Shuttleworth Design with his brother Orion, wrote in the statement. “The hull configuration developed from a requirement to reduce windage, while keeping the solar array sufficiently high above the water to reduce wave impact.”

IBM revisited

Sometimes it’s frightening to realize what went up on the blog in the past and that someone has actually read it.  Take IBM and their collusion in assorted nefariousness in the past.

Ken Craggs sends:

I was reading your article about IBM:

Only after Jews were identified — a massive and complex task that Hitler wanted done immediately — could they be targeted for efficient asset confiscation, ghettoization, deportation, enslaved labor, and, ultimately, annihilation. It was a cross-tabulation and organizational challenge so monumental, it called for a computer. Of course, in the 1930s no computer existed.

But IBM’s Hollerith punch card technology did exist. Aided by the company’s custom-designed and constantly updated Hollerith systems, Hitler was able to automate his persecution of the Jews. Historians have always been amazed at the speed and accuracy with which the Nazis were able to identify and locate European Jewry.