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The Rotax 503 is a 37 kW (50 hp), inline 2-cylinder, two-stroke aircraft engine, built by BRP-Rotax GmbH & Co. KG of Austria for use in ultralight aircraft. [ 1 ] [ 2 ] For decades the engine was one of the most popular and reputedly reliable aircraft engines in its class (two-stroke, under 60 horsepower), [ 3 ] and it remains widely used and ...
Open-cockpit, conventional landing gear, ultralight trainer with two seats in tandem, standard engine is the Rotax 503 of 50 hp (37 kW) with the Rotax 582 of 64 hp (48 kW), 80 hp (60 kW) or the Rotax 912UL of 100 hp (75 kW) optional. The aircraft uses the wings, tailboom and tail of the S-12XL, but is fitted with a new steel tube cockpit structure.
The basic engine is the Rotax 503 of 50 hp (37 kW), with the Rotax 582 of 64 hp (48 kW) and the Hirth 3701 of 100 hp (75 kW) available as options. [ 1 ] [ 2 ] [ 10 ] The S-10 Sakota aerobatic two-seater was later developed from the S-9.
Standard engine is the 100 hp (75 kW) Rotax 912ULS and the 2010 base price is US$99,000. [16] S-6S Super Six Improved version with dope and fabric covering, introduced in 1993. Standard engine is the 100 hp (75 kW) Rotax 912ULS. Available with standard wing, "116" wing and "light sport wing". In production in 2010. [3] [5] [6] [13]
The original basic engine was the Rotax 277 of 28 hp (21 kW), with the Rotax 447 of 40 hp (30 kW) and the Rotax 503 of 50 hp (37 kW) available later as options. [ 1 ] [ 2 ] [ 11 ] The Coyote II two-seater was later developed from the S-5.
The aircraft was designed as a two-place ultralight trainer. It features a parachute-style high-wing, two seats in tandem, tricycle landing gear and a single 50 hp (37 kW) Rotax 503 engine in pusher configuration. The 64 hp (48 kW) Rotax 582 liquid-cooled engine was a factory option. [1] [2] [3]
When built as a Part 103 ultralight, the aircraft is intended to be powered by a 26 hp (19 kW) Rotax 277, 35 hp (26 kW) Rotax 377, or similar engine. Heavier and more powerful engines including the Rotax 503 may also be used, but will result in exceeding the FAR Part 103 less than 254 pound (115 kg) empty weight limit, if the aircraft is ...
The aircraft was designed around the Rotax 503 powerplant, with the goal of producing an economical ultralight trainer. [5] As a homebuilt it can also be fitted with a number of different piston engines including the HKS 700, Rotax 582 and Jabiru 2200. [1] [3] [4] [6]