# How Boeing Stacks Electric Space Vehicles for Launch

> A design for a launch vehicle that carries two space vehicles stacked on top of each other, both using electric propulsion systems for movement in space.

- **Patent:** US 11708181
- **Original title:** Methods and apparatus for performing propulsion operations using electric propulsion systems
- **Owner:** Boeing Co
- **Granted:** 2023
- **Status:** Active
- **Times cited:** 2
- **Field:** aerospace, mechanical

## What it does

This patent describes a specific way to stack two spacecraft inside a launch vehicle. Each spacecraft has its own electric propulsion system and a core structure. The system uses pivotable mounts to hold propellant tanks, which helps manage the structural loads during the intense vibrations and forces of a rocket launch. By stacking them, the design allows the upper vehicle to transmit launch forces through the lower vehicle's structure, ensuring both survive the trip to orbit.

## What it does NOT cover

- Does not cover chemical rocket engines used for the initial launch phase.
- Does not cover non-electric propulsion systems like traditional liquid fuel combustion engines.
- Does not cover spacecraft that are not stacked in a releasable configuration.
- Does not cover single-stage spacecraft designs without a secondary stacked vehicle.

## The clever bit

The use of pivotable mounts for the propellant tanks allows the spacecraft to handle the mechanical stresses of launch without needing heavy, rigid reinforcements that would otherwise eat into the payload weight budget.

## Real-world examples

1. Satellite constellations
2. Modular orbital transfer vehicles
3. Deep space exploration probes

## Why it matters

As the space industry shifts toward smaller, electric-powered satellites and modular spacecraft, launching multiple units efficiently is critical. This design helps aerospace companies maximize the limited space inside a rocket fairing while protecting sensitive electric propulsion components from launch stress.

## Frequently asked questions

### What does How Boeing Stacks Electric Space Vehicles for Launch cover?

A design for a launch vehicle that carries two space vehicles stacked on top of each other, both using electric propulsion systems for movement in space.

### Who owns patent US 11708181?

Boeing Co owns this patent, granted in 2023.

### When does this patent expire?

This patent is expected to expire on July 25, 2043, when the invention enters the public domain.

### What is patent US 11708181 cited by?

This patent has been cited by 2 later patents that build on its ideas.

### What problem does this patent solve?

As the space industry shifts toward smaller, electric-powered satellites and modular spacecraft, launching multiple units efficiently is critical. This design helps aerospace companies maximize the limited space inside a rocket fairing while protecting sensitive electric propulsion components from launch stress.

### What does this patent NOT cover?

Does not cover chemical rocket engines used for the initial launch phase.

**Full plain-English explainer:** https://patentbrief.org/patent/us/11708181/mechazilla-catch-tower

**Original patent:** https://patents.google.com/patent/US11708181

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._