bouchard

16 ms·

31.
by bouchard 3y ago
Understanding Aerodynamics: Arguing from the Real Physics by Doug McLean, a former aerodynamics Technical Fellow at Boeing Commercial Airplanes.
32.
by bouchard 3y ago
Not really, they're a nice first step though, or if you require something "good enough".
33.
by bouchard 3y ago
Which can be a bit of a challenge when trying to land, especially for aerodynamically efficient aircraft.
34.
by bouchard 3y ago
FWIW, I use numba's (experimental) jitclass pretty successfully in my projects. (Actually a monkey-patched version to be able to set njit arguments)
35.
by bouchard 3y ago
> (good pointers on speeding up the Python code beyond Numpy listed but not tried or benchmarked) Damn, it would have been a nice benchmark if they did do a comparison against numba/cython.
36.
by bouchard 3y ago
From GitHub: > Some timings for the Shed Skin 'sieve' example (n=100000000) and several Python implementations/optimizers: cpython 3.10.6: 13.4 seconds cpython 3.11.0: 11.4 nuitka 0.6.16: 11.4 pypy 3
37.
by bouchard 3y ago
GP is talking about the current homepage which shows the following text over a colored background: > Since 2001, OGRE has grown to become one of the most popular open-source graphics rendering engines, and has been used in a large number
38.
by bouchard 3y ago
You can use mamba's much faster solver directly with conda. conda install -n base conda-libmamba-solver conda config --set solver libmamba
39.
by bouchard 3y ago
I found "Modern Fortran: Building Efficient Parallel Applications" to be a pretty good read. See https://milancurcic.com/book/ Also https://fortran-lang.org/en/ is a good hub to find mor
40.
by bouchard 3y ago
I don't believe anybody would argue against their reluctance for old FORTRAN 77 code; it's a PITA to deal with. The central issue is that their experience with the old Fortran doesn't translate to modern Fortran; they are two
41.
The Boeing Cascade Climate Impact Model(cascade.boeing.com)
1 points by bouchard 3y ago|0 comments
42.
by bouchard 3y ago
I get the sentiment, and there's definitely a lot of work to be done and actions to be taken by the right stakeholders. But just to put things in perspective; all of aviation contributes up to only 2.5% of all global emissions (both di
43.
by bouchard 3y ago
I understand the lack of appetite for old FORTRAN 77 code, but PRIMA is a modern Fortran implementation. You only need Python's ctypes module to load the compiled Fortran library thanks to Fortran's iso_c_binding module. Using f2c
44.
by bouchard 4y ago
Depending on the province, "Engineer" and/or "Professional Engineer" are legally restricted titles. You can't use the title (neither can your employer) unless you are licenced to do so.
45.
by bouchard 4y ago
I wonder how it compares to taichi-lang which also came out of MIT CSAIL and doesn't suffer from this "Business Source Licence" nonsense.
46.
by bouchard 4y ago
I've recently started using Taichi ( https://taichi-lang.org/ ) for numerical codes and the fact it doesn't try to trick you into thinking it's numpy is a nice "feature". ;)
47.
by bouchard 4y ago
He didn't work on dams... > A company statement said that Mr Wang worked on batteries for the utility's Center of Excellence in Transportation Electrification and Energy Storage (CETEES), which develops technology for electric
48.
by bouchard 4y ago
> They've always prioritized fidelity of the actual simulation. It's as realistic as they can get it. Yeah, not really. The models are tuned until it feels like the actual aircraft which is good, however it wasn't until ju
49.
by bouchard 4y ago
Their website isn't exactly up to date. Dr. Patrick Nathen who published Lilium's white paper detailing their aircraft architecture has left his VP role and is now an engineer within their flight mechanics team [0]. [0] https:&#x
50.
by bouchard 4y ago
Just yesterday Unpaywall found a publicly available copy of a 1980s article I was looking for and which Sci-hub didn't have.
51.
by bouchard 4y ago
Matlab: optimization and global optimization toolboxes. Python: PyOptSparse with IPOPT (and NSGA-II, although not the best implementation) and scipy.optimize. I use them for the Design Optimization of aircraft with multiple non-linear const
52.
by bouchard 5y ago
I'm pretty sure that's what is recommended here in Québec, Canada when there's no sidewalk. Seems weird that it wouldn't also be the case in the US.
53.
Canada tells Boeing its bid for fighter jet contract falls short(reuters.com)
28 points by bouchard 5y ago|61 comments
54.
Wisk sues Archer for theft of eVTOL design and other trade secrets(evtol.com)
3 points by bouchard 6y ago|0 comments
55.
by bouchard 6y ago
Just realised you were answering to another comment and not its parent... Disregard my previous answer.
56.
by bouchard 6y ago
Canada is part of the Five Eyes and might share what they find if thought useful. Anyway, the point is that the website claims canadian courts can lawfully demand your password/key (key disclosure law) even though the reference cited (
57.
by bouchard 6y ago
> In Canada key disclosure is covered under the Canadian Charter of Rights and Freedoms section 11(c) which states "any person charged with an offence has the right not to be compelled to be a witness in proceedings against that per
58.
by bouchard 6y ago
The rotorcraft used for the Bin Laden raid weren't standard Black hawks. The modifications probably required huge trade-offs in cost/performance and might still not be quiet enough for daily use in urban/residential areas.
59.
by bouchard 6y ago
What you fail to take into account is that with a privatized postal service, non-profitable routes will stopped being serviced even if it's essential to the population.
60.
by bouchard 6y ago
Moonshot doesn't even begin to describe how incredible of a feat that would be. Unsteady aerodynamics alone are one hell of a challenge.

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