Recent content by Young

Roughly, rocket's final speed is ~Ve / (propellant portion of the rocket). If you through in this condition, chemical propulsion may not do.

It was a long time ago when I calculated the speed gain vs energy spent by the rocket. I reworked that and it shows that the ratio is decreasing as the speed of the rocket increases compared to that of exhaust. Sorry I was not very clear.

You are right. The rocket still gains speed.

One thing that needs to be considered is your speed vs. that of exhaust. Once you reach the speed of exhaust, it does not help you very much. You need the speed of exhaust as fast as possible. Ultimately, you want to use ion engine or photons to propel your rocket to go very far.

It probably depends on how hot you can heat the gas. Roughly 0.5 * M * V^2 ~ k * T. k is the Bottzmann cost. T is temperature. M is the mass of the molecule. V is the velocity. By the way, the fastest exhaust out there is photons.

Maintenance? Taken today.

Taken today

It seems that Tesla's announcement about next motor without rare earth elements surprised experts. https://spectrum.ieee.org/permanent-magnet-tesla

For a rotating space station, to have gravity, period T = 2 * PI * sqrt( (radius in meters) / 9.8). For radius 980 m, T is about 63 sec.

Construction pictures taken today.

Interesting. So after using up 8% of fuel, assuming most of the weight is fuel, the thrust to weight ratio is about 1.3.

A few cars charging there earlier today.

Construction fence is gone. Transformer is there.

Construction in progress.

There is a transformer at that location. Sorry, no pictures.