An aircraft flying over the ocean or in a remote area, line-of-sight communication is not possible, and communication with the drone is typically done over satellite, adding around 500ms of delay. When you add in hardware processing and sensor delays, the total delays on a drone like the Predator UAV can experience latencies of as much as 2s, which is significant enough to create problems during landing and takeoff. According to the Telegraph:
But the two-second delay between a pilot moving a joystick in Nevada and an aircraft responding in Afghanistan is enough to cause a crash during take-off and landing. Crews in Afghanistan control 'launch and recovery’ through direct contact with antennae on the aircraft. Half an hour after take-off, control of the Reaper is handed to a crew in Nevada; half an hour before landing, it returns to the crews on the ground in Kandahar.
The 2s delay is not a problem for a typical Predator mission. In a dog-fight, however, 2s is an eternity and it would mean the drones would be unable to respond effectively to a manned aircraft.
They did this by simply modifying the speed limit sign with some black tape, turning a "3" into an "8."
It's an interesting hack, but it's basically just saying "look, we found way 1001 how to trick image recognition software". Yes you did. Here's your badge, now take a number and stand in line.
As someone who works with safety critical engineering systems, this raises concerns to me far beyond the image recognition software. It tells me that the Tesla Autopilot software is relying on a single source of data to set a safety critical parameter (speed) - a huge no-no in any safety critical system (see 737 MAX). Even if the sign were read as 85mph, a good driver would evaluate his surroundings and the road conditions before deciding whether to accelerate. Common sense would dictate that a sign indicating a speed well above highway speed levels in a small rural road should not be taken at face value.
One should not be using a single source of data as a key input - and whether that data comes from image recognition software or the mapping software, the basic problem remains that the Tesla Autopilot is vulnerable to a critical safety issue if a single data input is corrupted. Ideally they should be having a combination of image recognition and mapping data, coupled with safety monitoring software to invalidate transient spikes in the data and obviously erroneous values.
A commercial aircraft cannot be certified if it is not stable in its operational envelope, and they would have been required to fly with MCAS off to meet the longitudinal stability requirements of FAR 25.173. I have a hard time believing that any reasonable pilot would not have noticed an inherent aircraft stability issue during certification flight test. It is, as the poster said, less stable at high angles-of-attack due to the engine placement, but still stable nonetheless. The main reason for MCAS was not for stability, but to maintain the aircraft stall characteristics similar to the earlier 737 models and eliminate pilot training.
Note also that the 737 is not the only aircraft type with this type of automated pitch trim command. The airbus A300 has a mach trim and angle-of-attack trim compensation that automatically moves the horizontal stabilizer to compensate for the aircraft pitch down tendency at high mach numbers and high angles-of-attack.
Basic income is to benefits payment what flat tax proposals are to taxation. Both are doomed to failure because the reality of replacing a progressive taxation system with a flat taxation, or a progressive benefits system with a flat rate benefit (basic income) is that a large number of people who benefited under the previous system will lose substantial amounts of money.
In both flat tax and basic income schemes, the people who lose out the most will be the most disadvantaged. In the case of basic income, those who currently claim multiple benefits - e.g. children with disabilities who may eligible for both childcare support and disability assistance; seniors on a pension who may be getting medicare assistance - would likely see a reduction in benefits under a basic income scheme. On top of it, a universal basic income scheme means everyone would be getting the same amount, so any goverment implementing it now has to explain why they are cutting back benefits from a poor family with special needs children while Bill Gates and Jeff Bezos are now getting $1,000 a month checks that they don't need.
The current supporters of basic income appear to sidestep the issue by framing it as an additional payment on top of existing benefits, but this not only goes against the premise of basic income, but is financially unscallable at a national level. Alternative, one could implement a basic income where the payment is distributed according to income and to need, but this would eventually lead back to a re-implementation of current welfare benefit systems.
Economists can certainly disappoint you. One said that the economy would turn up by the last quarter. Well, I'm down to mine and it hasn't. -- Robert Orben