A Rotax 503 mounted on a Flightstar II ultralightThe prototype Blue Yonder Twin Engine EZ Flyer is powered by two 503s in pusher configurationAir Creation Racer ultralight trike with Rotax 503 mounted up-right. Below the muffler is the smaller after-muffler.
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 supported.[4]
As of 2011 the Rotax 503 is no longer in production.[3][5] However, a Russian manufacturer has developed an approximate reproduction, the RMZ 500.[3] Rotax subsequently offered only one other two-stroke engine for aircraft, the partially water-cooled Rotax 582.[4]
^BRP-Rotax GmbH & Co. KG (2006). "OPERATORS MANUAL FOR ENGINE TYPES 447, 503 & 582" (PDF). Retrieved 9 March 2009.
^Raisner, William: LEAF catlog, pages 6-105. Leading Edge Airfoils, 1995.
^ abcJohnson, Dan: "What’s Affordable in 2022? A New “503,” Wheeled-Carriages, and Two-Place PPGs," February 3, 2022, ByDanJohnson.com, retrieved June 29, 2023
^ abPrizio, Dave: "Firewall Forward: Rotax service Training," July 19, 2013, Kitplanes, retrieved July 5, 2023
^"Rotax Website - Aircraft Overview". Brp-powertrain.com. Retrieved 1 September 2012.
The Rotax503 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...
self-launch, a pop-out propeller is mounted on the rear fuselage driven by a Rotax503 piston engine. In 2007 the company developed the Taurus Electro with the...
dual-ignition 50 hp (37 kW) Rotax503 engine, with the 40 hp (30 kW) Rotax 447 and the 64 hp (48 kW) liquid-cooled Rotax 582 optional. With the Star 12...
tricycle landing gear and a single 54 hp (40 kW) Rotax503 engine in pusher configuration. A version with a Rotax 447 to meet the FAR 103 Ultralight rules is...
powered by the 26 hp (19 kW) Rotax 277 engine, 50 hp (37 kW) Rotax503, 60 hp (45 kW) HKS 700E four-stroke or the 64 hp (48 kW) Rotax 582 Flightstar IISL Improved...
9 m) wingspan gives faster roll rate. Engines 40 hp (30 kW) Rotax 447, 50 hp (37 kW) Rotax503, 64 hp (48 kW) 582 or 60 hp (45 kW) HKS 700E. Qualifies as...
(30 kW) Rotax 447 and optional engines included the 52 hp (39 kW) Rotax503, 64 hp (48 kW) Rotax 582, 74 hp (55 kW) Rotax 618 and the 80 hp (60 kW) Rotax 912UL...
available include the two-stroke 40 hp (30 kW) Rotax 447, 52 hp (39 kW) Rotax503, 65 hp (48 kW) Rotax 582, 40 hp (30 kW) Hirth 2702, 55 hp (41 kW) Hirth...
gear and a single 52 hp (39 kW) Rotax503 engine in pusher configuration. Versions were also available with a Rotax 582 or Hirth 3701 engine. Data from...
include 50 hp (37 kW) Rotax503, 64 hp (48 kW) Rotax 582, 80 hp (60 kW) Rotax 912UL, 100 hp (75 kW) Rotax 912ULS and 115 hp (86 kW) Rotax 914. First flown...
brake. The engine is a Rotax503 of 50 hp (37 kW) Kiss 400 GTE 582 Version with the Kiss 400 wing, rated for 400 kg (882 lb) and Rotax 582 engine of 64 hp...
including the 50 hp (37 kW) Rotax503, the four-stroke 60 hp (45 kW) HKS 700E, the 64 hp (48 kW) Rotax 582 and the 80 hp (60 kW) Rotax 912. The heavier engines...
The standard engine is the 50 hp (37 kW) Rotax503 which gives a cruise speed of 51 mph (82 km/h). The Rotax 582 engine of 64 hp (48 kW) is optional....
1982. Standard engine is the 40 hp (30 kW) Rotax 447, with the 50 hp (37 kW) Rotax503 or 64 hp (48 kW) Rotax 582 as options. In the USA the aircraft could...
by the 50 hp (37 kW) Rotax503 two-stroke powerplant and the Merlin GT and Sport 65 version powered by the 64 hp (48 kW) Rotax 532 and later 582. The...
selling for US$350. Recommended engines include the 50 hp (37 kW) Rotax503, 40 hp (30 kW) Rotax 447, 35 hp (26 kW) 2SI 460-35 or 38 hp (28 kW) 1/2 VW. In December...
amateur-built aircraft. Standard engines are the 50 hp (37 kW) Rotax503 64 hp (48 kW) Rotax 582. 42 had been completed and flown by the end of 2011. Aventura...
the 40 hp (30 kW) Rotax 447, 50 hp (37 kW) Rotax503 and the 64 hp (48 kW) Rotax 582 engines are used. By 2011 the Rotax 447 and 503 were out of production...
II was sold for US$15,662.76, complete with propeller, 50 hp (37 kW) Rotax503 powerplant, paint and fabric in 1988. Available options included folding...
combination of its predictable and docile handling, along with the reliable Rotax503 50 hp (37 kW) engine, ensured its success. Larry Croome left Spectrum...
different model designation. When equipped with a 37 kW (50 hp) Rotax503 or 48 kW (64 hp) Rotax 582 two-stroke engine, the aircraft is designated as a Phase...
two-stroke 50 hp (37 kW) Rotax503 and with this engine the standard empty weight is 385 lb (175 kg). The 64 hp (48 kW) Rotax 582 is also used. The Freebird...
Optional engines include the 40 hp (30 kW) Rotax 447, the 50 hp (37 kW) Rotax503 and the 64 hp (48 kW) Rotax 582. Twenty had been constructed by December...
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