Pi day

Just found it’s 3.14 today. Yes, it is Pi(e) day.

3.14159265359…

This famous constant number is fascinating for all math-lovers. It’s simply the ratio of diameter and circumference. However, it’s proven to be irrational number ‘surprisingly’.

Circle is a symbol for some sort of perfection, in East or West. But Continue reading “Pi day”

Dan-Sha-Li?

This is non-aerodynamics topic but you might find it interesting as I am impressed over drink-out conversation in Tokyo the other day…

What is Dan-Sha-Ri?

As is often with an engineers, I am not a person with tidied-up room. all drone parts and junk electric components (and of course, 10+year old PCs!) – never seen complete floor for a while.

Continue reading “Dan-Sha-Li?”