A jet engine does Molecular Nuclear Fusion
1 CH4+pO2 ->CO2+He+H2O+E2+X-ray
The way to improve this, is to Ti plate the exhaust manifold. We then get double the He and heat. This was taught to me in 1983.
The other thing we can do is have a ring of venturi nozels around the exhaust! Here the passibg CO2 and H2O suck water into the exhaust. We do boiling Molecular Nuclear Fusion
2 H2O+TU ->He+O+E2+X-ray
I keep mentioning X-rays, as there is no chemical source of these. We must be doing nuclear fusion! As there is no source of nuclear fission.
So we increase the thrust from the gine by a factro of 10! So we actually reduce the fuel burn by a factor of 10.
We set up these crafts to shuttel between, America, the UK, Australia and China. We undercut the price of present jet travel – and it is 3 times faster.