# PAM-S

> special booster stage used by the Ulysses spacecraft

**Wikidata**: [Q25510106](https://www.wikidata.org/wiki/Q25510106)  
**Source**: https://4ort.xyz/entity/pam-s

## Summary
PAM-S (Payload Assist Module-Special) is a specialized single-stage solid-fueled booster stage used by the Ulysses spacecraft. It was developed as part of the Payload Assist Module (PAM) class and powered by the Star 48 motor, manufactured by McDonnell Douglas in the United States.

## Key Facts
- **Type**: Specialized booster stage for the Ulysses spacecraft
- **Class**: Payload Assist Module (PAM)
- **Fuel Type**: Solid-fueled
- **Power Source**: Star 48 motor
- **Manufacturer**: McDonnell Douglas
- **Country of Origin**: United States
- **Subclass of**: Payload Assist Module
- **Aliases**: Payload Assist Module-Special
- **Instance of**: Rocket model
- **Wikipedia Availability**: Available in Galician (gl)

## FAQs
### Q: What was the PAM-S used for?
A: The PAM-S was specifically used as a booster stage for the Ulysses spacecraft, a mission to study the Sun's polar regions.

### Q: Who manufactured the PAM-S?
A: The PAM-S was manufactured by McDonnell Douglas, a U.S.-based aerospace company.

### Q: What type of fuel did the PAM-S use?
A: The PAM-S was a solid-fueled booster stage powered by the Star 48 motor.

### Q: Is the PAM-S related to other Payload Assist Modules?
A: Yes, the PAM-S is a subclass of the Payload Assist Module (PAM) class, which includes other single-stage solid-fueled booster stages.

### Q: Where can I find more information about the PAM-S?
A: Detailed information can be found on sources like [Skyrocket](https://space.skyrocket.de/doc_stage/pam-d.htm) and [GlobalSecurity.org](https://www.globalsecurity.org/space/systems/pam.htm).

## Why It Matters
The PAM-S played a crucial role in the Ulysses mission, which was the first spacecraft to study the Sun's polar regions. By providing the necessary boost to escape Earth's gravitational pull, the PAM-S enabled Ulysses to achieve its unique solar orbit. This mission provided groundbreaking insights into solar activity and its effects on space weather. The PAM-S represents a key example of how specialized booster stages contribute to ambitious space exploration missions, demonstrating the importance of precise propulsion systems in achieving scientific objectives.

## Notable For
- **Specialized Role**: Designed specifically for the Ulysses mission, making it a tailored solution for a high-profile space exploration project.
- **Solid-Fueled Design**: Utilized solid propulsion, which was a common choice for booster stages in the era, ensuring reliable performance.
- **Star 48 Motor**: Powered by the Star 48 motor, a proven solid rocket motor used in other space missions.
- **U.S. Manufacturing**: Produced by McDonnell Douglas, a leading aerospace manufacturer at the time.
- **Pioneering Mission**: Enabled the Ulysses spacecraft to achieve a unique solar orbit, contributing to solar science.

## Body
### Overview
The PAM-S was a specialized booster stage used exclusively for the Ulysses spacecraft, a mission launched in 1990 to study the Sun's polar regions. It was part of the broader Payload Assist Module (PAM) class, which included other single-stage solid-fueled booster stages.

### Design and Specifications
- **Fuel Type**: Solid-fueled, powered by the Star 48 motor.
- **Manufacturer**: McDonnell Douglas, a U.S.-based aerospace company.
- **Country of Origin**: United States.

### Role in Ulysses Mission
- **Launch Assistance**: Provided the necessary boost to escape Earth's gravity and achieve the required trajectory for Ulysses.
- **Solar Orbit**: Enabled the spacecraft to reach a unique polar orbit around the Sun, allowing for unprecedented solar observations.

### Historical Context
- **Era**: Developed in the late 20th century, a time when solid-fueled boosters were a common choice for space missions.
- **Collaboration**: Worked in conjunction with other PAM variants to support various space exploration efforts.

### Legacy
- **Scientific Contributions**: The PAM-S helped Ulysses gather critical data on solar activity, improving our understanding of space weather.
- **Technological Heritage**: Serves as an example of how specialized booster stages can enable complex space missions.

## References

1. [Source](https://www.globalsecurity.org/space/systems/pam.htm)
2. [Source](https://space.skyrocket.de/doc_stage/pam-d.htm)