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← Every aircraft propulsion system is an air pump, and accelerating a…
11 connected korrents · 12 moments from 12 Jun 2017 to 20 Sept 2026.
Everything filed under aviation
aviation
Everything filed under batteries
batteries
Everything filed under innovation
innovation
Everything filed under permitting
permitting Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Same subject Read this korrent: Every aircraft propulsion system is an air pump, and accelerating a large mass of air a little is always more efficient than accelerating a little air a lot. Every aircraft propulsion system is an air pump, and accelerating a large mass of air a little is always more efficient than accelerating a little air a lot. Last stated 4 years ago
8 Jul 2022
BF
Bjorn Fehrm — holds since 2022-07-08 — tap for who they are
Same subject: Electrification transfers badly from cars to aircraft, because a car engine is under 10% efficient while a modern aero engine is already 30 to 40%. — tap to centre the map on it Electrification transfers badly from cars to aircraft, because a car engine is under 10% efficient while a modern aero engine is already 30 to 40%. Last stated 5 years ago
28 Jan 2022
BF
Bjorn Fehrm — holds since 2022-01-28 — tap for who they are
Same subject: A hybrid-electric airliner ends up heavier and more complex than the aircraft it replaces and delivers no fuel saving at all. — tap to centre the map on it A hybrid-electric airliner ends up heavier and more complex than the aircraft it replaces and delivers no fuel saving at all. Last stated 6 years ago
2 Apr 2021
BF
Bjorn Fehrm — holds since 2021-04-02 — tap for who they are
Same subject: A data centre powered by solar and batteries alone needs an array so oversized that the design is not worth building. — tap to centre the map on it A data centre powered by solar and batteries alone needs an array so oversized that the design is not worth building. Last stated 3 years ago
18 Apr 2024
AV
Austin Vernon — holds since 2024-04-18 — tap for who they are
Same subject: About a fifth of the US grid could be freed for data centres just by covering the yearly peak with batteries or peaker plants. — tap to centre the map on it About a fifth of the US grid could be freed for data centres just by covering the yearly peak with batteries or peaker plants. Last stated 7 months ago
13 Mar 2026
DP
Dylan Patel — holds since 2026-03-13 — tap for who they are
Same subject: Apple's risk is being reduced to hardware: people keep buying the best phone while everything they do on it comes from someone else's model. — tap to centre the map on it Apple's risk is being reduced to hardware: people keep buying the best phone while everything they do on it comes from someone else's model. Last stated a year ago
2 Sept 2025
BE
Benedict Evans — holds since 2025-09-02 — tap for who they are
Same subject: A healthy attitude may be to assume a rule had a reason but default to removing it, since situations might change. — tap to centre the map on it A healthy attitude may be to assume a rule had a reason but default to removing it, since situations might change. Last stated a month ago
20 Sept 2026
AR
Armin Ronacher — holds since 2026-09-20 — tap for who they are
Same subject: A neighbourhood redevelops itself when rising land values meet permission to build more intensely, and it stagnates when either half is missing. — tap to centre the map on it A neighbourhood redevelops itself when rising land values meet permission to build more intensely, and it stagnates when either half is missing. Last stated 9 years ago
12 Jun 2017
CM
Charles Marohn — holds since 2017-06-12 — tap for who they are
Same subject: Environmental permitting now causes more environmental harm than it prevents, because what it delays is the clean thing replacing the dirty one. — tap to centre the map on it Environmental permitting now causes more environmental harm than it prevents, because what it delays is the clean thing replacing the dirty one. Last stated 3 years ago
10 Nov 2023
CH
Casey Handmer — holds since 2023-11-10 — tap for who they are
Same subject: "Lots of anonymous people worked it out by trial and error" is never the real story of an invention: on closer investigation, identifiable people always turn out to be responsible. — tap to centre the map on it "Lots of anonymous people worked it out by trial and error" is never the real story of an invention: on closer investigation, identifiable people always turn out to be responsible. Last stated 3 years ago
25 Oct 2023
AH
Anton Howes — holds since 2023-10-25 — tap for who they are
Same subject: A business can have market fit, real advantages, and sustained effort behind a hard product and still fail if it doesn't give customers a strong enough reason to switch from what they already use. — tap to centre the map on it A business can have market fit, real advantages, and sustained effort behind a hard product and still fail if it doesn't give customers a strong enough reason to switch from what they already use. Last stated 5 months ago
2 Jun 2026
JJ
Justin Jackson — holds since 2026-06-02 — tap for who they are
Same subject: A capability existing is not the same as a capability being absorbed: how fast a technology changes the world is not set by how fast the technology improves. — tap to centre the map on it A capability existing is not the same as a capability being absorbed: how fast a technology changes the world is not set by how fast the technology improves. Last stated 3 months ago
21 Jul 2026
RT
Ruxandra Teslo — holds since 2026-07-21 — tap for who they are