https://emsubo.com/skyring/ The air war of 1914–1918 — the machines, the men, and the history behind The Flying Log. https://emsubo.com/skyring/posts/2026-09-10-castor-oil/ https://emsubo.com/skyring/posts/2026-09-10-castor-oil/ Thu, 10 Sep 2026 00:00:00 GMT SAMPLE POST — replace with a real one. The rotary engine's strange lubricant, and what it did to the men behind it.