Coaster no. 16, thrust estimates based on Shuttle performance

A look at some Shuttle performance data. If the coaster can match this, it can give us an idea of what to expect.

The caption to the pic below calculates thrust per pound of hydrogen expended.  Question:  Can the coaster expel a pound of hydrogen per second?  If so, the thrust would be 1104 lbs thrust ( I think).

274.71 gals/sec;1864.88 lbs-sec/gal; 1.69 lbs/gal; 1104.39 ratio of thrust per pound

A quick look at chamber pressure.  It is lower than the hydrogen tanks for fuel cell vehicles that I've seen.  At just under 3000k psi, it is significantly less than the 5000 psi that I've seen for those.  This appears feasible, by those standards.



Some general performance data to throw in there.

Shuttle combustion chamber reaches 3315 C. That's hotter than the goal for the coaster.  May need to get the temperatures up for the coaster.  It may not be hot enough.

The rocket equations that I've have on spreadsheet show some anomalies.  If mass is increased, delta v goes down---all other factors equal.  I need to look at that closely when time permits.

It now appears that the coaster cannot launch itself.  How to launch then, from the moon?

Thought:  what if you were to use hunter gas gun for this?

You can use the gas gun to send up fuel for a reusable rocket system that could land on moon and return to be used again and again.  This system can also deploy coasters.

Miscellaneous thought:  reusability problem:  have to carry mass with you if you want full reusability.  That's why you're stuff needs to be small.  Gas guns get around part of this problem.  Small projectiles to deliver fuel are not wasting so much matter.  Won't matter so much if they are not fully reusable.