Quad copters only exist because you can use cheap variable speed electric motors along with fixed propellers. Once you start scaling up in size, batteries aren't going to cut it, and engines prefer to run at fixed RPMs. Fixed RPMs require variable pitch propellers, and once you've gone that far, you're better off… » 10/21/14 1:52am Today 1:52am

So do books, and magazines, and pens/pencils, and small children not flying in their own seats, and all kinds of other objects already allowed to be out and in use during takeoff. They're just making the arbitrary and unreasonable "and are electronic" claim, which has no bearing on it's ballistic properties. » 10/11/14 3:45pm 10/11/14 3:45pm

Redundant sensors, actuators, power, data busses, and control systems all add up to it being more reliable than a mechanical coupling. Aerospace companies have been doing it for decades. That said, considering one of Musk's other companies has already had to develop and implement these kinds of systems, I would… » 10/10/14 1:59pm 10/10/14 1:59pm

The expected results aren't unknown. The Sun is constantly showering Earth with massive quantities of protons and neutrinos. If anything bad were to happen, we would have never been here in the first place to cause it. All we're doing is repeating the same processes in a controlled manner such that it can be studied. » 10/10/14 1:42pm 10/10/14 1:42pm

Their power and torque curves are summed. You are correct in that you can't simply add the two peak power outputs together, you must find the peak of their summed outputs. If their individual peaks do not line up, then their combined peak will be something lower than 691HP. » 10/10/14 12:04am 10/10/14 12:04am

That's not how the power grid works. Things like coal and nuclear cannot simply be turned off. Coal plants can take hours to bring up a head of steam, and nuclear plants poison themselves with certain neutron absorbing radioisotopes that take a week or more to decay to the point that the reactor can achieve… » 10/09/14 9:07pm 10/09/14 9:07pm

The automation wasn't very hard ten years ago. Airliners will basically fly themselves if you let them. The trouble is that these are the kinds of systems that cannot fail. You don't just have a flight control computer. You have them in triplicate, always cross checking each other for anomalies, with a backup… » 10/08/14 11:47pm 10/08/14 11:47pm