The limits of simulation (From Henry Spencer)
The 27May91 Aviation Week, reporting on the April 1 test-stand failure of an upgraded SRB (Solid Rocket Booster) for the Titan 4:
Investigators determined that extensive three-dimensional computer simulations of the [motor's] firing
dynamics did not reveal subtle factors that they now believe contributed to motor failure. [Program director]
Stifling said the full-scale test was essential precisely because computer analyses cannot accurately predict all
nuances of solid rocket motor dynamics. "That's why we test", he said.
For those who don't follow the space news, a few seconds into the test the motor pressure rose rapidly and
exceeded the limits of the casing, the result being a large, spectacular explosion that destroyed the motor and
much of the Edwards AFB test stand.
-ACM SIGSOFT SOFTWARE ENGINEERING NOTES vol 16 no 4 Oct 1991 Page 15
Yeah, me too. There were onboard cameras on Starship and Super Heavy. Hopefully they'll release more footage and info over time.
Even the first launch had some. https://www.reddit.com/r/SpaceXLounge/comments/12claay/the_k.... I recall the during the SpaceX audio commentary of this morning's launch (but perhaps EverydayAstronaut's) it was mentioned that onboard cameras on Starship and Super Heavy would be attempting to communicate via Starlink for the first time.
I think most people don't understand the concept of if you want to succeed, fail faster.
It's valid (and explained well and often) but counterintuitive.
(And with mundane tasks, it's less applicable, as with them, it's reasonable to expect that when competent people attempt them, they generally get done correctly.)
The clause only applies to certain email. Applicable? "The term “commercial electronic mail message” means any electronic mail message the primary purpose of which is the commercial advertisement or promotion of a commercial product or service". Probably not.
Kudos to Intellectual Ventures Laboratory, Nathan Mhyrvold, Matthew D. Keller, Bryan J. Norton, David J. Farrar, Phil Rutschman, Maclen Marvit & Arty Makagon! I look forward to deploying this tech to deal with fruit flies soonish. I don’t even need to do a back of the envelope calculation to have confidence this is soon to be a viable first world niche product. I think it’s likely viable at a massive scale (many millions of units) too.
The limits of simulation (From Henry Spencer) The 27May91 Aviation Week, reporting on the April 1 test-stand failure of an upgraded SRB (Solid Rocket Booster) for the Titan 4: Investigators determined that extensive three-dimensional computer simulations of the [motor's] firing dynamics did not reveal subtle factors that they now believe contributed to motor failure. [Program director] Stifling said the full-scale test was essential precisely because computer analyses cannot accurately predict all nuances of solid rocket motor dynamics. "That's why we test", he said. For those who don't follow the space news, a few seconds into the test the motor pressure rose rapidly and exceeded the limits of the casing, the result being a large, spectacular explosion that destroyed the motor and much of the Edwards AFB test stand.
-ACM SIGSOFT SOFTWARE ENGINEERING NOTES vol 16 no 4 Oct 1991 Page 15