Specific Impulse (Isp)
A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate.
01 Definition
02 Detailed_Analysis
A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate. Higher Isp means less propellant for a given delta-v. Fusion propulsion concepts target Isp of 10⁴-10⁶ seconds. A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate. Higher Isp means less propellant for a given delta-v. Fusion propulsion concepts target Isp of 10⁴-10⁶ seconds.
03 Key_Facts
- ▸ A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate
- ▸ Higher Isp means less propellant for a given delta-v
- ▸ Fusion propulsion concepts target Isp of 10⁴-10⁶ seconds
- ▸ Related Concepts: Fusion Driven Rocket, Plasma Propulsion
04 Deep_Dive_Intelligence
Overview
A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate. Higher Isp means less propellant for a given delta-v. Fusion propulsion concepts target Isp of 10⁴-10⁶ seconds.
Role: Glossary term: Specific Impulse (Isp)
Entity Type: Concept — Specific Impulse (Isp) is a technical concept or theoretical framework.
Technical Definition
A measure of rocket propulsion efficiency, defined as thrust divided by propellant mass flow rate. Higher Isp means less propellant for a given delta-v. Fusion propulsion concepts target Isp of 10⁴-10⁶ seconds.
Related Concepts: Fusion Driven Rocket, Plasma Propulsion
06 Related_Terms (2)
07 Related_Entities (4)
08 Timeline_Mentions (10)
Project ORION Active
The Air Force and NASA engage in Project ORION, a classified effort to develop external nuclear pulse propulsion using fission-driven pulse units. The program involved prominent physicists and enginee
defense-programsProject ORION Terminated
Project ORION is terminated primarily for political reasons, ending early research into external pulsed plasma propulsion despite promising technical results.
historical-contextMalmstrom AFB ICBM shutdown (March 16, 1967): 10 missiles off-line, 'red pulsating oval 30 feet' over gate, Salas witness, 'signal sent to missiles'
10 ICBMs simultaneous shutdown. Lt. Salas DMCCC. 'Red pulsating oval, 30 feet.' Guard screaming, weapons drawn. 'Signal sent to missiles.' 'National security incident.' No explanation. 2025 Pentagon c
uap-researchAstron experiment funding cancelled at LLNL
16-year project ends without achieving field reversal. Compact torus concept disperses to spheromak and FRC research.
historical-contextChristofilos Astron experiment cancelled at LLNL
17-year Astron project ends. Field reversal concept disperses to LANL (FRC) and LLNL/PPPL (spheromak).
historical-contextFission Plasma Propulsion Research
R.A. Gerwin, R.A. Nebel, and D.I. Poston present research on using spheromak configurations for magnetic control of gas-core fission plasma propulsion at the 31st AIAA Joint Propulsion Conference.
fusion-physicsEPPP and GABRIEL Framework Proposed
NASA researchers propose External Pulsed Plasma Propulsion (EPPP) and the GABRIEL evolutionary framework as a viable path for human exploration beyond Mars.
fusion-physicsAFRL DPF paper (Feb 2006): 'pulsed-train plasmoid weapons,' 'gravity or time-distorting devices,' Q=3-6 overunity, gigawatts — the smoking gun
AFRL paper ADA446973. Aneutronic p-B11 DPF fusion. Q=3-6 → gigawatts. Explicitly mentions 'plasmoid weapons' and 'gravity/time-distorting devices.' SSTO military aerospace vehicle. MHD propulsion. Tim
uap-researchMSNW ELF thruster and NASA FRC propulsion
MSNW LLC's FRC-based ELF thruster with NASA funding.
propulsion-physicsM2P2 Propulsion Prospects Analyzed
Kelly A. Wallenstein evaluates Mini-Magnetospheric Plasma Propulsion (M2P2), a concept by Robert Winglee using plasma to inflate magnetic sails.
fusion-physics09 FAQ
What is Specific Impulse (Isp)? ▾
Why does Specific Impulse (Isp) matter? ▾
How does Specific Impulse (Isp) relate to other concepts? ▾
When did Specific Impulse (Isp) appear in the research timeline? ▾
Which entities are associated with Specific Impulse (Isp)? ▾
Is there a detailed dossier for Specific Impulse (Isp)? ▾
Quick_Facts
- Category
- Propulsion
- Aliases
- Specific Impulse (Isp), specific-impulse-isp, Isp, isp
- Sources
- 8
- Related Terms
- 2
- Graph Entities
- 4
- Timeline Events
- 10