The limitation of incoming airspeed of TurboJet engines is limited to the compressor, not the combustor section, the blades need subsonic air to operate properly, it you feed it supersonic air, they won’t compress the incoming air properly and then the flame goes out.

No. There’s too much else wrong in that video to accept that as a simple slip of the tongue.

Shrouded turbofans are quieter, and provide a degree of protection against blade failure. Propfans are “more efficient”, in that they provide more static thrust for a given amount of power, trading high speed top end for better low speed performance.

I was going home on a red eye, eastbound out of Seattle. Ground speed indicator, now on the TVs on the back of the seat in front of you, was over 1100kph. Flying “supersonic” in that fashion is not uncommon. The polar jetstream has been measured in excess of 400kph.

Those are all static thrust ratings, which gives you very little information on how much they’re capable of producing at cruise.

Then, there IS the problem of feeding supersonic air into a jet engine...you can’t, it’ll extinguish the flame, and no flame, no thrust...no thrust, and gravity takes over.

Someone can correct me but we haven’t used turbofans since the 70s due to the efficiency of turbofans

The video picks up on one of the inherent efficiencies of a turbofan compared to a turbojet - that as you increase airflow through a turbojet, the fuel flow must increase as well to maintain the correct air/fuel ratios.

You intentionally drove in some poor semi driver’s blind spot for fifty-five miles?

Merging is limited only by your ability. If there is sufficient room for you to merge, and speeds are such that your merging will not result in you being rear ended, then you can merge. Any claim otherwise could only be made under the very subjective “reckless operation”.

At least it’s not as bad as Monster.

Yes. It’s a real word. It’s how GPS works.

The same way you do every other form of encryption in a lossy medium? Layer error correction on top of the encrypted form. This isn’t a data transmission where you have to capture everything. Considering this is intended to supplement existing INS, you don’t have to update more than every few minutes. You also don’t…

If you want to generate vortices to set up a downstream surface, you use something with a very low aspect ratio, like a chine or strake. Not something like this.

These cars are not supersonic. Objects placed downstream absolutely do affect flow upstream.

Why would they want to make the trip faster? I thought fares were based on time, not distance.

Just as the current satellite GPS, this would be encrypted to prevent spoofing.  

I went there. I watched the videos. They use a big curved flap extending out beyond the back of the trailer, using the Coanda effect to pull air in behind it. The plasma actuators are used to maintain flow attachment across that flap, allowing them to make it more aggressive and smaller.

The airfoil zone is taken up by the actual airfoil. They’re using very low power plasma actuators to prevent flow separation over that airfoil, making the airfoil more effective, so they don’t require the huge paddles TrailerTail uses. They’re not using the plasma itself to deflect the flow.

Looks like they’re doing the same thing everyone else is, putting a physical airfoil on the back edge of the trailer to pull air inwards. Nothing virtual about it.