How Launch Vehicles Are Classified
Launch vehicles (rockets) are classified primarily by their payload capacity to a reference orbit — typically Low Earth Orbit (LEO) at 400-600 km. Mass class determines cost, available manifest slots, and whether rideshare is possible. The main categories are small, medium, heavy, and super heavy launch vehicles.
Small Launch Vehicles (SLVs)
Small launch vehicles carry payloads below approximately 2,000 kg to LEO. They are used for dedicated smallsat missions where orbit control, launch window, or time-to-orbit is more important than cost per kg. SLVs are more expensive per kg than rideshare on large rockets but give customers full mission control.
| Vehicle | Operator | LEO Capacity | Typical Use |
|---|---|---|---|
| Rocket Lab Electron | Rocket Lab (USA/NZ) | 300 kg | Dedicated CubeSat and SmallSat missions |
| ISRO SSLV | ISRO (India) | 500 kg SSO | Rideshare and dedicated smallsat |
| Firefly Alpha | Firefly (USA) | 1,000 kg | US government and commercial smallsat |
| RocketStar Fire Ant | RocketStar (USA) | ~300 kg | Rapid-response dedicated launch |
View Electron launch windows on KOSMOLAB SPACE to see active rideshare and dedicated slots.
Medium Launch Vehicles
Medium launch vehicles carry 2,000 to 10,000 kg to LEO. They are workhorses for government and commercial missions and the primary platform for rideshare manifests carrying dozens of small satellites.
| Vehicle | Operator | LEO Capacity | Rideshare? |
|---|---|---|---|
| Falcon 9 Block 5 | SpaceX (USA) | 22,800 kg | Yes — Transporter series |
| Ariane 62 | Arianespace (EU) | 10,350 kg | Yes — multi-manifest |
| PSLV-XL | ISRO (India) | 3,800 kg SSO | Yes — commercial rideshare |
| Vega-C | Arianespace (EU) | 2,300 kg SSO | Yes — SmallSat manifest |
| H3-30 | JAXA/MHI (Japan) | 4,000 kg SSO | Yes — government + commercial |
SpaceX Falcon 9 Transporter missions are the most active rideshare platform globally, flying to SSO and LEO several times per year. View all Falcon 9 rideshare windows on KOSMOLAB SPACE.
Heavy and Super Heavy Launch Vehicles
Heavy-lift vehicles (10,000-70,000 kg to LEO) serve large government payloads, GPS and communications satellites, and some hosted payload rideshare arrangements. Super heavy vehicles (Falcon Heavy, SLS, Starship) are used for deep space, lunar, and high-mass government missions. Small satellite rideshare on these vehicles is rare — the primary rideshare market is on medium-class rockets.
Which Vehicle Is Right for Your SmallSat?
The right launch vehicle depends on three factors: payload mass, required orbit, and schedule flexibility.
- Payload below 150 kg, standard SSO/LEO orbit, flexible schedule — Rideshare on Falcon 9 Transporter or Ariane 62 is the most cost-effective option.
- Payload below 300 kg, custom inclination or time-critical window — Dedicated Rocket Lab Electron or Firefly Alpha gives orbit and schedule control.
- Payload 300-2,000 kg with specific orbit requirements — Small-to-medium dedicated vehicle (SSLV, PSLV, Vega-C).
- Payload above 2,000 kg or hosted payload on a large mission — Medium to heavy class rocket, typically procured through a direct launch services agreement.
Browse launch windows by orbit and form factor on KOSMOLAB SPACE to match your mission to the right available slot.
Launch Vehicle Propellants and Environmental Impact
Modern launch vehicles use liquid oxygen (LOX) with kerosene (RP-1), liquid hydrogen (LH2), or liquid methane as propellants. Solid-propellant upper stages are common on medium-class rockets. Rocket Lab Electron uses a battery-powered electric pump cycle with RP-1/LOX — a first-stage approach that reduces complexity. Environmental impact of rocket launches is a growing research area; current launches contribute a small fraction of global aviation emissions but the space industry is actively working on cleaner propellant alternatives.
Frequently Asked Questions
What is the most used launch vehicle for CubeSat rideshare?
SpaceX Falcon 9 Transporter missions are the dominant rideshare platform for CubeSats and SmallSats globally. Transporter missions fly to SSO (500-525 km) and carry 50-100+ smallsat payloads per flight. Other active rideshare platforms include Ariane 62, ISRO PSLV-XL, and D-Orbit ION orbital transfer vehicle deployments. View Falcon 9 windows on KOSMOLAB SPACE.
What is the difference between a launch vehicle and a launch service?
A launch vehicle is the rocket itself. A launch service is the commercial offering from a provider that includes payload integration, transport to the launch site, launch vehicle access, and on-orbit deployment. When you book a rideshare slot, you are purchasing a launch service — the launch vehicle operator (SpaceX, Rocket Lab, etc.) is the upstream supplier. Rideshare operators like D-Orbit and Exolaunch aggregate capacity from multiple launch vehicles and sell slots directly to satellite operators.
How reliable are small launch vehicles?
Rocket Lab Electron has a high mission success rate with over 50 launches as of 2026. New small launch vehicles typically go through 3-5 developmental flights before achieving high reliability. When booking a dedicated small launch vehicle, check the provider flight record and whether launch insurance is available. Most rideshare missions on established medium rockets (Falcon 9, PSLV) have near-perfect reliability records.
What is an upper stage or kick stage?
An upper stage is a rocket stage that ignites after the main booster separates, delivering payloads to a higher or more precise orbit. A kick stage is a smaller, storable-propellant stage used for final orbit insertion. Orbital transfer vehicles (OTVs) like D-Orbit ION function as reusable kick stages that deploy multiple customer payloads to different custom orbits from a single rideshare insertion point.
Do all launch vehicles support rideshare?
No. Rideshare requires a dispenser system (P-POD, J-BOX, ISIPOD, etc.) installed on the rocket and a rideshare operator managing the payload manifest. Most medium-class commercial rockets now support rideshare through dedicated operators. Small launch vehicles like Electron are primarily used for fully dedicated missions, though they increasingly support multi-manifest missions with 2-5 payloads. Check KOSMOLAB SPACE providers for which operators offer rideshare on which vehicles.