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Rotax 503

rotax503dcdi
503DCDI

 

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.

The Rotax 503 features piston ported, air-cooled cylinder heads and cylinders, utilizing either a fan or free air for cooling. Lubrication is either by use of pre-mixed fuel and oil or oil injection from an externally mounted oil tank. The 503 has dual independent breakerless, magneto capacitor-discharge ignition (CDI) systems and can be equipped with either one or two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure. An optional High Altitude Compensation kit is available.

The engine's propeller drive is via a Rotax type B, C, or E style gearbox. The standard engine includes a muffler exhaust system with an extra after-muffler as optional. The standard starter is a recoil start type, with an electric starter optional. An integral alternating current generator producing 170 watts at 12 volts with external rectifier-regulator is optional. The engine includes an intake air filter and can be fitted with an intake silencer system.

 

Rotax-503-3
Rotax 503 DCDI

 

The manufacturer acknowledges the design limitations of this engine, warning pilots:
"This engine, by its design, is subject to sudden stoppage. Engine stoppage can result in crash landings, forced landings or no power landings. Such crash landings can lead to serious bodily injury or death...This is not a certificated aircraft engine. It has not received any safety or durability testing, and conforms to no aircraft standards. It is for use in experimental, uncertificated aircraft and vehicles only in which an engine failure will not compromise safety. User assumes all risk of use, and acknowledges by his use that he knows this engine is subject to sudden stoppage...Never fly the aircraft equipped with this engine at locations, airspeeds, altitudes, or other circumstances from which a successful no-power landing cannot be made, after sudden engine stoppage. Aircraft equipped with this engine must only fly in DAYLIGHT VFR conditions."

As of 2011 the Rotax 503 is no longer in production.

 

Applications:
21st Century Airships SPAS 13
A-B Helicopters A/W 95
Aces High Cuby II
Acrolite
Advanced Aeromarine Buccaneer SX
Aero Adventure Aventura HP
AeroLites Bearcat
Aeroprakt A-20
Aeros-2
Aeros Cross Country
Aero-Works Aerolite 103
Airbet Girabet
Airborne Edge
Airborne Redback
Air Creation GT
Air Creation Racer
Air Creation Twin
Airdrome Dream Fantasy Twin
Airdrome Fokker D-VI
Airdrome Fokker D-VIII
Airfer Transan
Alliant Destiny Fusion
Alliant Destiny XLT
Alpaero Choucas
AmeriPlanes Mitchell Wing T-10
Anglin J6 Karatoo
Antonov T-2M Maverick
Antares A-10R503 SOLO
Antares MA-32
Apex Eco 6
Aquilair Kid
Australian Autogyro Skyhook
Australian Ultralight Industries Bunyip
Aviasud Mistral
Avid Champion
Avid Flyer
BAaer Guri
Bagalini Baganfibio
BB Microlight BB-two seater
Birdman Chinook 2S
Best Off Skyranger
Blue Yonder EZ Flyer
Blue Yonder EZ Harvard
Blue Yonder EZ King Cobra
Blue Yonder Merlin
Blue Yonder Twin Engine EZ Flyer
Buckeye Eclipse
Capella Javelin II
Capella SS
Carlson Sparrow
Circa Reproductions Morane Saulnier N
Circa Reproductions Nieuport
CFM Shadow
CGS Hawk
Chadwick C-122 helicopter
Club ULM Rotor Ptenets-2
Cosmos Bison
Cosmos Echo
Cosmos Phase II
Cyclone AX2000
Danieli Piuma
DAR-23
DTA Evolution
Earthstar Thunder Gull
Emerald Coast XL2 Sport
Eurofly Fire Cat
Eurofly Fire Fox
Eurofly Fox
Eurofly Viper
Excalibur Aircraft Excalibur
Facetmobile
Fisher Avenger
Fisher Super Koala
Fisher FP-404 EXP
Fisher FP-505 Skeeter
Fisher FP-606 Sky Baby
Fisher Youngster
Fletcher Hercules
Flightstar II
Fly Air Swallow
Flying K Sky Raider
Flylab Tucano
Fly Synthesis Wallaby
Freebird II
Freedom Lite SS-11 Skywatch
GibboGear Butterfly
Gidroplan Che-22 Korvet
Golden Circle Air T-Bird
Krasniye Kryl'ya Mandelevium MD-30
Krasniye Kryl'ya Deltacraft MD-40
Harmening High Flyer
Harper Lil Breezy
Heldeberg Convertible
Heldeberg Marathon
Heldeberg Spirit 103
Howland H-3 Pegasus
Hy-Tek Clipwing
Hy-Tek Hurricane Hauler
InterPlane Skyboy
ISON Airbike
J & J Ultralights Seawing
JDT Eros
Joplin Tundra
Kolb Firestar
Kolb Mark III
Kolb Slingshot
Kubicek AV-1
Las Brisas Mohawk
Let-Mont Piper UL
Let-Mont Tulak
Letov ST-4 Aztek
Light Miniature Aircraft LM-1
Lockwood Drifter XP503
Loehle Sport Parasol
Mainair Rapier
Mariner Aircraft Mariner
Micro Aviation Bantam
Microleve ML 450
Midwest Hornet
Mountaineer Trikes Solo 175
M-Squared Breese
Murphy Maverick
Murphy Renegade
North American Rotorwerks Pitbull Ultralight
North Wing Apache
Pagotto Brako
Pegasus Quantum
Phantom X1
Phoenix Skyblazer
Pipistrel Taurus
Precision Tech Fergy
Pterodactyl Ascender
Polaris Skin
Quad City Challenger II
Quicksilver GT400
Quicksilver MX-2 Sprint
RagWing RW26 Special II
RagWing RW7 Duster
RagWing RW8 PT2S
RagWing RW11 Rag-A-Bond
RagWing RW22 Tiger Moth
Raj Hamsa Clipper
Raj Hamsa Voyager
Raj Hamsa X-Air
Rainbow Aerotrike
Rans S-4 Coyote
Rans S-6 Coyote II
Rans S-7 Courier
Rans S-9 Chaos
Rans S-12 Airaile
Rans S-17 Stinger
Rocky Mountain Wings Ridge Runner
Rolandas Kalinauskas RK-7 Orange
Rotor Flight Dynamics Dominator
Skystar Kitfox XL
Sabre 340
Sabre Wildcat
St Andrews Viking
Sapphire Aircraft Australia Sapphire LSA
Sea-Bow International Sea-Bow
Six Chuter SR1
Sky Seeker Powerchutes Sky Seeker
SlipStream Genesis
Sochen Phoenix
Solo Wings Aquilla
Solo Wings Windlass
Sorrell Hiperlight
Spartan DFD Aerotome
Skywatch SS11
Spectrum Beaver
Sport Copter Lightning
Sport Flight Talon
Stellar Astra
Summit 2
Summit 103 Mini Breeze
Summit Steel Breeze
TC's Trikes Coyote
Teman Mono-Fly
Tennessee Propellers Scout
TeST TST-3 Alpin T
Titan Tornado
TL Ultralight TL-32 Typhoon
ViS Sprint
Vortech G-1
World Seair Corp Seair

 

Specifications:
503
Type: two-stroke air-cooled aeroengine
Bore: 72 mm (2.84 in)
Stroke: 61 mm (2.4 in)
Displacement: 496.7 cc (30.31 cu in)
Dry weight: 31.4 kg (69 lb) (dry, no exhaust system)
Valvetrain: piston ports
Fuel system: pneumatic pump pressurized
Fuel type: regular autofuel
Oil system: premixed in the fuel at 50:1 or oil injection
Cooling system: fan or free air
Reduction gear: Rotax 'B' gearbox: 2.00, 2.24 or 2.58 ratios; Rotax 'C' or 'D' gearbox: 2.62, 3.00, 3.47 or 4.00 ratios
Power output: 37 kW (50 hp) at 6800 rpm
Compression ratio: 10.8 (theoretical)
Fuel consumption: 15 l/hr (4 US gph)
Power-to-weight ratio: 1.18 kW/kg (0.72 hp/lb)

 

503 UL 2V DCDI
Cycle: 2
No cylinders: 2
Bore: 72 mm
Stroke: 61 mm
Compression: 6.3
Displacement: 496.7 cc
Cooling: Air
Ignition: Electronic Ducati
Reduction: Mechanical Gear ‘B’ ‘C’ or ‘E’
Reduction ratio: 2-4:1
Weight: 42.8 kg
Max pwr: 49.5 hp at 6500 rpm
Max torque: 55 at 6000 rpm
Fuel consumption: 360 G/hp/hr
Price 1998: 19 693,98 Fttc

 

The 503 B-Box with Pull Start, DCDI, (dual carb, dual ignition) of 52 hp weighs 323 lb.
Rotax 503 DCDI, B-Box w/Electric Start & Mag End: 343 lbs
Rotax 503 DCDI, C-Box (dampener) w/ Pull Start: 331 lbs
Rotax 503 DCDI, E-Box w/ Electric Start: 347 lbs

 

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