Sublime

Illustrations from a Japanese fireworks catalogue, ca. 1880s. Lots more on our site — visit link in bio.⠀⁠ ⠀⁠ Digitised by the Yokohama City Library, these English language catalogues for the Hirayama Fireworks company were published by C. T. Brock and Company, the oldest fireworks manufacturer in the United Kingdom. Fou... See more

The HT-100 helicopter employs a Flettner rotor system, eliminating the need for a tail rotor. This design reduces drag, enhances aerodynamic performance, and provides more precise control. The system improves energy efficiency by up to 30%, enabling longer missions or increased payload capacity. It also performs reliabl... See more

Interesting. Instead of shaft-coupling, as with all all gas turbines, there's an electrical coupling between turbine and compressor, provided by a very high-efficiency motor/geneator pair (98 percent claimed because operating at liquid-methane temps). So turbine/compressor can vary speeds, and batteries can provide power for the compressor for part... See more