olex

21 ms·

181.
by olex 9y ago
The satellites do it themselves. The deployments from second stage are staggered with pauses of 100 seconds between each to allow them to safely drift apart from the initial separation jolt. After that, the sats do their own thing.
182.
by olex 9y ago
All manned spacecraft in history had launch escape systems (or at least ejection seats, on Gemini and Vostok). Except for the Space Shuttle... The Dragon 2 system is a first though, in that it uses liquid propellants and is highly controlla
183.
by olex 9y ago
No, that's for a single engine. At landing, the first stage is nearly empty, and thus very light. Even the single center engine alone, throttled as low as it will go (40% or something like that, I don't think we have the exact num
184.
by olex 9y ago
The idea of the hoverslam is to arrive at zero vertical velocity at exactly zero altitude. This is complicated, but can be done fairly reliably when "zero altitude" is stationary - on land landings or drone ship in calm seas. In h
185.
by olex 9y ago
Yes, you're correct. Elon stated in a tweet earlier today that the aluminum fins had burned up their ablative coating on every flight.
186.
by olex 9y ago
Yes. Probably due to pitching drone ship deck due to heavy seas, the stage reached zero vertical velocity above the deck and had to shut down. Even at the lowest throttle setting the first stage still has a TWR > 1 and cannot hover witho
187.
by olex 9y ago
This was the first launch of the titanium fins. The BulgariaSat booster from two days ago was an older block 3 first stage with the "original" aluminum fins. They did glow quite a bit during the very hot re-entry, visible on the l
188.
by olex 10y ago
Your car tires are rubber, and designed to last for a long time at speed. Curiosity's tires are aluminum, and are designed for much less and much slower driving. That seems weird, but the important point is their mass: they only weigh
189.
by olex 10y ago
"Relatively" being very much a keyword here. Nothing about sending two people around the moon is easy, there's a reason it hasn't been done in several decades.
190.
by olex 10y ago
That's probably it. Not as much space I think, but life support for an extended period of time. This is one key difference between Dragon/CST-100 and Orion: the latter is designed for extended deep space travel with full crew, and
191.
by olex 10y ago
There are no nuclear power plants in areas of Ukraine that are affected by the conflict. The closest one is the Zaporizhia Nuclear Power Plant, but it's located in a stable area with no current military activity. Other three are furthe
192.
by olex 10y ago
Musk has stated several times that this rather simplistic architecture works best for them. Tesla has evaluated other cell and pack designs, and still maintains that cylindrical cells are optimal. The Model 3 pack will use newer 2170 cells,
193.
by olex 10y ago
Isn't it supposed to be available in all of (or most of) Europe as the Opel Ampera-E? Various German e-mobility sources have published more than a few previews and stuff, would be surprising if it doesn't arrive here. edit Opel
194.
by olex 10y ago
This is not looking good for GoPro at all. The Karma hasn't had really good reviews from the very start, and once DJI released the Mavic it basically lost all chances of grabbing a significant portion of the market. Now this is adding
195.
by olex 10y ago
That's a very interesting number. Here a comparison, from Germany too: I used to live with 3 flatmates for several years in a 4BR apartment (165m²), our yearly usage averaged 5500-7000 kWh. That included heating water (electric boiler)
196.
by olex 10y ago
With the hybrids being included, I fear the money will run out before the first Model 3's arrive on this side of the Atlantic. I'd love if it didn't, being an early in-store reservation holder myself :)
197.
by olex 10y ago
Frankly, yes. If anything, someone who has spare 80k€ to spend on a car is more careful with his/her money, and 4k€ is nothing to sneeze at, no matter what kind of income one has.
198.
by olex 10y ago
One thing the article is missing: the subsidy is explicitly limited to vehicles that cost less that 60.000€. One can say with pretty high confidence that this is done with the explicit goal of excluding Tesla's Model S and Model X. Thi
199.
by olex 11y ago
Just how accurate is this 2000$ GPS supposed to be? Because my 40$ Ublox M8N GNSS modules on several copters produce a solid lock with constant HDOP<1.5 under normal conditions, averaging around ~1.5m horizontal position deviation, and a
200.
by olex 12y ago
Currently they land on an autonomous ship (huge flat barge with stationkeeping engines and autonomous control). Reason is, they haven't yet proven that their approach and landing are accurate enough to get permission to try a landing o
201.
by olex 12y ago
Looks like the landing leg on that side collapsed during touchdown. The thruster did all it could, but alas, it couldn't keep firing forever... nor did it have enough thrust to actually hold the rocket vertical all by itself, for that
202.
by olex 13y ago
> But you don't need backup since you have SkyDrive now ;) Oh what a fallacy this is. Cloud storage is at best a backup solution for some personal files you don't value too much, but in no way a replacement for a full-system ba
203.
by olex 13y ago
diydrones.com, flitetest.com, /r/multicopter and /r/fpv will help you out :)
204.
by olex 13y ago
A simple DJI Phantom will easily get to that altitude. Slight modifications would be required - possibly a different receiver and remote control to ensure the range, and an FPV system (camera and transmitter on the copter, and a receiver wi
205.
by olex 13y ago
Good luck hitting the lens on a moving UAV a couple dozen meters off the ground...
206.
by olex 13y ago
Absolutely, flying them over the people masses at Burning Man is definitely not a good idea. I operate UAVs commercially in Germany, and both my insurance and flight permit explicitly forbid overflight of people or animals. However, even wh
207.
by olex 13y ago
As long as the operator of the photographing UAV follows the same photography rules and guidelines as the people running around with cameras on the ground, I don't see a problem. Also, shooting down a UAV is a) illegal (property damage
208.
by olex 13y ago
Shooting down a drone is a criminal offense, property damage and all that. The UAV owner would be in the right to sue and win. Also, if it crashes on top of something as a result, the shooter would be responsible for that damage as well.
209.
by olex 13y ago
If you use autopilot to assist you flying the model, a delay is not a big problem. However, most people fly models in full manual, with the FPV setup giving them an "in-cockpit" experience. Even for fairly slow multicopters, a lat
210.
by olex 13y ago
This is cool, but the Oculus is not the optimal tool for the job right now. I'm in the FPV hobby for over half a year and fly quadrocopters and model airplanes using video goggles. The Rift currently has one important problem that, unt

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