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Comment Online groceries are standard in the UK (Score 1) 193

I live in the suburbs of London. I've been doing my supermarket shopping online for the past ten years. Not having to go to Tesco on a Saturday afternoon and overcome the urge to stab every fucker I see there in the face is worth every penny of the (typically) £5 delivery fee.

New York is a plausible place to do this, as it has the density of population. Might have a harder time in the 'burbs.

Comment Where is it practical? (Score 1) 127

But it does not allow rockets to reenter the Earth's atmosphere at orbital velocities, slow down, and land.

How about the Moon and Mars? It seems to me that the fuel capacity of Dragon isn't enough to do both lunar descent and ascent just on the Super Draco thrusters and the trunk's fuel capacity.

Comment What's really impressive (Score 2) 127

The impressive part is that they do it with an actual rocket that is 106 feet tall, and that they have launched it 7 times with 0 failures.

Using the same engine, rather than treating the engine as a disposable object that only performs one burn in its lifetime. Most rocket engines can't be throttled, can't be shut down and then restarted in flight or otherwise.

The tricky part is going to be for any stage to have enough delta-V to return to the pad after lifting a payload to orbit. Also, as far as I can tell, this takes a drag chute for lower stages, and a re-entry shield for upper ones.

Bruce

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