N351SL
Scaled Composites 351 Stratolaunch (Roc)
Scaled Composites LLC
2 Hours
Duration of Flight
1000 NM
Range
460 MPH
Max Speed
Gallery
Basic Information
Airframe
Data valid as of 2023-09-15| Date | From | To | Flight Time | Status |
|---|---|---|---|---|
| 2025-07-10 | N/A | N/A | N/A | ✓ Landed |
| 2025-07-10 | N/A | N/A | N/A | ✓ Landed |
| 2023-05-13 | N/A | N/A | N/A | ✓ Landed |
| 2021-12-02 | N/A | N/A | N/A | ✓ Landed |
| 2020-07-23 | N/A | N/A | N/A | ✓ Landed |
| 2019-04-13 | N/A | N/A | N/A | ✓ Landed |
AI Summary
Scaled Composites 351 Stratolaunch (Roc)
Overview
U.S. registration N351SL; type: experimental/research; registrant: Bank Of Utah Trustee, Salt Lake City, UT (corporation). Certificate issued 2019-11-05. Mode S (hex) A3EA1F.
Specifications
- Engines: 6× Pratt & Whitney PW4056 (56750 lbf each)
- Range: 1000 nm
- Cruise: 430 kts
- Seats: 3
- Ceiling: 35000 ft
Operations & Cabin
Flight deck in right fuselage (2 pilots + flight engineer), left fuselage uncrewed; no conventional passenger cabin (specialized mission/mission support layout). Cockpit and mission systems concentrated in the right fuselage; mission-specific racks and telemetry systems inboard and on the center wing pylon as required for launch support. Avionics: Avionics architecture and many systems repurposed from Boeing 747-400 components (747-derived avionics architecture).
Model & Market Context
This airframe, registered as N351SL, is the Scaled Composites 351 Stratolaunch (Roc) with build year 2018 and serial number 001. The aircraft is owned by Bank Of Utah Trustee, a corporate trustee based in Salt Lake City, UT, USA, and carries a United States registration. Ownership is recorded under a corporate trustee rather than an individual operator, and the operator or home base is not published in the available data. Registry records emphasize the airframe’s unique role and bespoke configuration rather than conventional airline service.
This particular Roc airframe features a split-fuselage flight deck arrangement with the flight deck in the right fuselage accommodating 2 pilots + flight engineer, while the left fuselage is uncrewed and there is no conventional passenger cabin, reflecting a specialized mission or mission-support layout. Avionics architecture and many systems are repurposed from Boeing 747-400 components, giving the Roc a 747-derived avionics architecture that affects maintenance, parts logistics and training. Typical operations center on high-payload, long-endurance launch or mission-support sorties within the aircraft’s approximately 1,000 nm range and 430 kts cruise profile; crew composition and ground support reflect its atypical configuration. Maintenance considerations include integration of large-airliner legacy systems into a bespoke airframe and the need for specialized tooling and personnel for the six-engine installation.
The Scaled Composites 351 Stratolaunch occupies a highly specialized performance niche as a fixed-wing, multi-engine airborne launch and heavy-mission platform rather than a transport or business jet. Comparable platforms are limited and typically purpose-built; conventional competitors are few, with alternatives usually involving different concepts (e.g., large carrier aircraft or balloon-based systems). Buyer and charter demand is therefore constrained to organizations with mission-specific needs, and resale considerations emphasize the airframe’s unique systems, the 747-derived avionics commonality, and the corporate-trust registration structure.