Six all-tilting propellers (Distributed Electric Propulsion); six dual-wound electric motors -- 4 tilt with the nacelle, 2 via linkage. 236 kW peak power per motor.
Propulsion Unit Count
6
Redundancy Approach
Each of the 6 units carries two independently wound motor windings sharing one housing, rather than a fully separate motor per redundancy path.
Range / Speed
Company-published: up to 100 mi range; up to 200 mph (174 kt). Capacity: 1 pilot + 4 passengers.
Seat Count
4
Last Updated
September 25, 2026
FAA type certification remains the decisive gate. Joby's Q2 2026 results (5 August 2026) describe its strongest quarterly progress yet in the fifth and final stage of FAA type certification, with five aircraft flying including the first FAA-conforming aircraft. eIPP demonstration flights began in Texas in September 2026; no Type Certificate has been issued.
Complete Stage 5 FAA verification and TIA flight testing required for issuance of the S4 Type Certificate.
The S4 is Joby Aviation’s piloted, winged electric vertical-takeoff-and-landing aircraft. The current public configuration carries one pilot and four passengers, uses six tilting electric propellers, and is designed to transition from vertical lift to wing-borne cruise.
PropulsionWatch treats the aircraft as a certification-stage program: the design has moved through development into conforming-aircraft and regulator-facing test activity, while type certification remains outstanding.
Six tilting propellers provide both vertical lift and cruise thrust. Each propulsion unit uses a dual-wound electric motor; Joby has publicly described 236 kW peak power per motor. The architecture distributes propulsion across six units rather than concentrating thrust in one or two engines.
Publicly disclosed performance targets include up to 100 miles of range and up to 200 mph, with a one-pilot/four-passenger cabin. These are manufacturer-published aircraft figures, not certified operational minima.
Joby's Q2 2026 results, published 5 August 2026, describe its strongest quarterly progress yet in the fifth and final stage of its five-stage FAA type-certification process. The accompanying shareholder letter reported five aircraft flying, including its first FAA-conforming aircraft, with 12 more in production.
In September 2026 Joby began eVTOL Integration Pilot Program (eIPP) flights in Texas as its autonomous J208 demonstrator crossed the United States. These limited pilot-program operations are separate from the FAA Type Certificate required for widespread commercial S4 operations.
Joby is preparing for commercial passenger operations while certification continues. Operational readiness depends on aircraft approval and the operating approvals applicable to the intended service. PropulsionWatch therefore keeps the operating state at PRE-EIS rather than treating announced launch markets or service preparations as entry into service.
Documented dependencies are regulatory rather than speculative: remaining compliance demonstration and regulator verification, issuance of the aircraft type certificate, applicable production approval, and aircraft-specific operating approvals before routine passenger service.
SEC filing — Form 10-Q, quarter ended 30 Jun 2026: Joby Aviation certification status, certification-basis history and distinction between FAA Type Certification and eIPP activity. Source.
SEC-filed shareholder letter — 5 Aug 2026: Joby Q2 2026 update reporting five aircraft flying, the first FAA-conforming aircraft and current Stage 4/5 progress. Source.
Evidence classification: certification percentages are company-reported process tracking; they are not regulator-issued approval percentages or a Type Certificate.
September 25, 2026
