Light Helicopters
Sikorsky Schweizer 333
ICAO: S333
Overview
The Sikorsky Schweizer S-434 was developed as a turbine-powered evolution of the 300 series. Intended to combine the familiar handling of the piston trainer with turbine reliability, it targeted both training and light utility markets. The aircraft represented an effort to modernize a legacy design.
Specifications
Units
- Engine
- 2 × Rolls-Royce Turbine 250-C20W
- Engine type
- Turbine
- Thrust
- 2 × 320 lbf · 1 kN
- Avionics
- —
- Wing tips
- No winglets
- Seats
- 4
- Crew
- —
- Cabin width
- —
- Cabin height
- —
- Cabin length
- —
- Exterior length
- 31 ft 2 in · 9.51 m
- Tail height
- —
- Fuselage diameter
- —
- Wing span
- 27 ft 6 in · 8.39 m
- Baggage volume
- —
- Gross weight
- —
- Empty weight
- —
- Max takeoff weight
- 2,900 lb · 1,300 kg
- Max landing weight
- —
- Max payload
- 1,200 lb · 550 kg
- Fuel capacity
- 80 gal · 300 L · 300 kg (Jet A)
- Max cruise speed
- 105 kt · 121 mph · 194 km/h
- Maximum speed
- —
- Cruise speed
- —
- Approach speed
- —
- Range
- 350 nm · 400 mi · 650 km
- Fuel burn
- 4.17 nm/gal · 2.04 km/L
- Ceiling
- 12,500 ft · 3,800 m
- Rate of climb
- —
- Takeoff distance
- —
- Landing distance
- —
Gallery
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Operational Context
Sikorsky Schweizer S-434 — turbine-powered light helicopter
The S-434 program was launched in the 2000s following Sikorsky’s acquisition of Schweizer Aircraft. It retained the basic rotor system and configuration of the 300 series but incorporated a Rolls-Royce 250 series turboshaft engine. This upgrade aimed to improve reliability and reduce maintenance compared with piston-powered variants.
The helicopter cruises at approximately 100 knots (185 km/h) and has a maximum takeoff weight of about 2,200 pounds (1,000 kg). The turbine installation improved power response and altitude performance. Cabin configuration remained similar to earlier 300 models.
Despite its technical merits, the S-434 saw limited production. Market demand for turbine trainers in this size category remained constrained. The aircraft nonetheless demonstrated the adaptability of the longstanding 300 airframe design.