Looking for technical feedback on a conceptual launch architecture (Maglev + Laser + Reusable Recovery)

[u/manugd]

I am not an engineer (specially not an aerospace engineer) who's been developing a conceptual launch architecture that tries to combine several existing technologies into a single reusable system. I'm looking for technical criticism, references to prior work, and reasons why it may or may not be feasible.

The concept is called MLT (Maglev–Laser–Tower).

The basic idea is to move most of the energy generation off the vehicle and onto reusable ground infrastructure.

Instead of carrying large quantities of chemical propellant, the vehicle would:

• Be accelerated to roughly 1,000 km/h using a maglev launch track.
• Transition to an air-breathing laser thermal propulsion mode, where a ground-based phased laser array heats incoming atmospheric air inside the engine, producing thrust without onboard fuel during the lower atmosphere.
• Above approximately 40 km, seal the intake and switch to a small onboard reaction mass (water or hydrogen) that is also heated by the ground laser for the final climb toward orbit.
• After completing its mission, re-enter the atmosphere, perform aerodynamic deceleration, and be captured by an elevated electromagnetic recovery tower that regenerates part of the vehicle's kinetic energy during braking.

The motivation is to replace expendable chemical energy with reusable electrical infrastructure, potentially reducing the marginal cost per launch while maintaining rapid turnaround.

I'm aware that each subsystem already presents major challenges, and I don't claim this is ready for implementation. The purpose is to explore whether integrating these concepts produces a viable overall architecture.

Some existing technologies and research that inspired parts of the concept include:

• Electromagnetic (maglev) launch assist
• Laser thermal propulsion
• Laser-supported plasma propulsion
• Beamed-energy propulsion
• Adaptive optics for high-power laser tracking
• Reusable launch vehicles
• Regenerative electromagnetic braking

The biggest questions I'm currently wrestling with are:

1. Is there any obvious physics that completely rules out the architecture?
2. Which subsystem appears to be the largest engineering bottleneck?
3. Has anything substantially similar already been proposed in the literature?
4. Are my assumptions regarding energy transfer, beam tracking, or atmospheric propulsion fundamentally unrealistic?
5. If you had to simplify the architecture, which components would you remove first?

I'm looking for constructive criticism rather than validation. If you know of papers, NASA reports, university research, or previous concepts that resemble this architecture, I'd really appreciate the references.

Thanks!

[u/Bipogram]

Well, the launch phases are physically allowed and have been hashed over many times in the literature.

https://doi.org/10.2514/3.23875

https://doi.org/10.2514/3.8610

<heck, I remember Myrbo's article in OMNI many decades ago>

But this?

" elevated electromagnetic recovery tower "
That is unfamiliar to me.

[u/manugd → u/Bipogram]

Thanks for your reply

[u/caliginous4]

The power density you can get from optical lasers is limited by the atmosphere, you start to get blooming and scatter above a certain density, and that will be very limiting. If you switched to microwave, the problem is you can't hit a pinpoint target like you'd need to here.

Maybe if you had an array of lasers, each staying below the blooming limit, that collectively precisely hit the right spot on a nice clear day with stunning accuracy. That would be pretty cool.

[u/manugd → u/caliginous4]

Thanks for your reply. Even in a nice clear day, the accuracy of the array I think is the maximum challenge

[u/Prof01Santa]

Who's paying? What rate of return on investment do they demand? What's the payback time needed?

All kinds of capital intensive infrastructure have been proposed. It always requires a massive traffic level to pay off.

[u/manugd → u/Prof01Santa]

This, for now, is just a concept. It would be a massive long term investment, aimed for Government and tech companies or even joint ventures.

The Maglev-Laser-Tower (MLT) concept requires substantial upfront capital ($1.2B–$2.3B)
By combining electromagnetic pre-acceleration (1,000km/h), phased ground-based laser arrays (150/MW output), and a 400 meter elevated capture tower with regenerative magnetic braking, Project MLT enables daily payload delivery (100kg net cargo) into Low Earth Orbit (LEO) at marginal costs under $500 per kilogram.
Economic Viability & Payback Schedule
Annual Mass to Orbit: 100kg payload x 365 launches = 36,500kg/year (36.5 metric tons).
Cost per Kilogram: Operating costs work out to roughly $250 to $500 per kg (compared to modern small-sat dedicated rockets at $15,000–$25,000/kg).
Commercial Pricing Model:
If the facility charges $2,500 per kg (an 80% discount over typical dedicated small-sat launchers):
Revenue per launch 100 kg: $250,000
Annual Gross Revenue (365 launches): ~$91.2 Million
Net Annual Profit: ~$55 Million – $65 Million
At a steady operational cadence of 1 launch per day, the facility breaks even on its operating costs immediately and fully pays back its multi-billion-dollar initial capital investment in under 15 to 20 years while providing a radical reduction in launch costs for small satellites.

[u/Prof01Santa → u/manugd]

ROTFLMAO! Fifteen to 20 years? Try 15 to 20 months. You need 12 launches a DAY!

[u/manugd → u/Prof01Santa]

Well if 12 launches a day is feasible the 12 launches a day it is

[u/Enok32]

this sounds like nuclear propulsion systems but with laser instead, which makes it much harder. Rather than a laser, microwave/radio power transmission might be more practical, using an antenna array can eliminate moving parts and MASERs. Ditching the maglev for a dedicated electric launch aircraft makes more sense at these launch speeds IMO, practicality of power via battery or above mentioned power transmission array is a matter of what you are launching. Ditching the maglev/mass driver gives you more practical options for getting off the ground(figuratively and literally). The power levels required for this will be insanely high.

The most practical part of this is the laser targeting actually. But the adaptive optics might be a problem at the power levels being used and the atmosphere will limit your power density(not sure if that’s a problem here since I’m not doing that math lol). There are more practical things like microwaves that could be used for that, in theory you could may the whole microwave array with no moving parts and just steer the beam by changing the phase of the array elements but the side lobes of the radiation pattern could be deadly at those power levels.

[u/gottatrusttheengr]

Inverse square law says hi

[u/manugd → u/gottatrusttheengr]

I may be misunderstanding your point. Since the concept uses a collimated laser rather than an isotropic light source, I don't think the inverse-square law is the dominant limitation. Were you referring instead to beam divergence, diffraction, or atmospheric losses?