The Rotax 914 is an Austrian turbo-charged, four-cylinder, horizontally opposed aircraft engine with air-cooled cylinders and water-cooled cylinder heads. Designed and built by Rotax the engine commonly powers certified light aircraft, homebuilt aircraft, autogyros and military UAVs such as the MQ-1 Predator.

The Rotax 914 is an 80 HP engine block that Rotax has added a Garrett Turbo to and boosted it to 115 HP for 5 minutes then full time 100 HP. It has been a very popular engine for many years and is used by the US military in the Predator Drones. The 914 does provide continuous sea level performance of 100 HP to over 12,000 feet.

The Rotax 914F is certified to FAR-33 and JAR-E. For takeoff 115 hp at 2385 prop rpm is available for a 5 minute maximum, and 100 hp at 2260 prop rpm continuous.

Applications:
Aero Adventure Pegasus
Aerospool WT9 Dynamic
Air Copter A3C
Alisport Yuma
Alpi Pioneer 300
Australian Aircraft Kits Hornet STOL
AutoGyro MT-03
AutoGyro Calidus
AutoGyro Cavalon
B&F Fk14 Polaris
Bauer BAD-12 Gyrotrainer
Bushcaddy R-80
Bushcaddy R-120
The Butterfly Super Sky Cycle
Celier Kiss
Celier Xenon 2
Chayair Sycamore
Criquet Storch
Denel Dynamics Bateleur
Diamond HK36 Super Dimona
Dorna Parandeh Abi
Dova DV-1 Skylark
Dyn’Aéro MCR4S
Dynali H2S
ELA 07
Eurodisplay SR-01 Magic
Europa XS
FD-Composites ArrowCopter
Flying Legend Hawker Hurricane Replica
General Aviation Design Bureau T-32 Maverick
Heli-Sport CH-7 Kompress helicopter
IAI Heron
Idea Hydropteron
Just Superstol
Magni M-14 Scout
Magni M-24 Orion
M&D Flugzeugbau Samburo
MQ-1 Predator
NAL Hansa
Norman Aviation Nordic VI
Norman Aviation Nordic 8 Mini Explorer
Pagotto Brakogyro
Phenix Aviation Phenix
RMT Bateleur
Roko Aero NG4
Rotor Flight Dynamics Dominator
RotorSport UK Calidus
RotorSport UK MT-03
Softeks V-24 Lastochka
SlipStream Genesis
Stemme S10 motor glider
Titan T-51 Mustang
Ultravia Pelican
Wild DoubleEnder
Wüst Seahawk

Specifications:
914
Type: four-cylinder, four-stroke liquid- / air-cooled engine with opposed cylinders
Bore: 79.5 mm (3.13 in)
Stroke: 61 mm (2.4 in)
Displacement: 1,211.2 cc (73.91 cu in)
Length: 561 mm (22.1 in)
Width: 576 mm (22.7 in)
Dry weight: 78 kg (170 lb) with electric starter, carburetors, fuel pump, air filters and oil system
Valvetrain: OHV, hydraulic lifters, pushrods, rocker arms
Fuel system: Dual CD carburetors, mechanical diaphragm pump
Fuel type: Unleaded: 87 octane AKI (Canada/USA) / 90 octane RON (European) or higher
Oil system: Dry sump with trochoid pump, camshaft driven
Cooling system: Liquid-cooled cylinder heads, air-cooled cylinders
Reduction gear: Integrated reduction gear 1:2.273; 1:2.43 optional
Electronic dual ignition
Power output: Maximum 84 kW (115 hp) at 5,800 rpm, with 5 minute time limit; 73 kW (100 hp) continuous

914 UL DCDI
Cycle: turbo 4 stroke
No cylinders: 4
Bore: 79.5 mm
Stroke: 61 mm
Compression: 8.75
Displacement: 1211 cc
Cooling: air-liquid
Ignition: Electronic Ducati
Reduction: mechanical 2.27:1 torque limited
Weight: 67.5 kg
Max pwr: 115 hp at 5800 rpm
Max torque: 123 at 4800 rpm
Fuel consumption: 250 G/hp/hr
Price 1998: 112 131,47 Fttc

Rotax 912 Engine 80 HP (912) or 100 HP (912 UL)
4 Stroke, 4 Cylinder, horizontally opposed
Water Cooled heads, air cooled barrels
Dual brakeless, capacitor discharge ignition
Twin Carburettors
Prop drive via reduction gear
Arguably the best engine available for Micro light aircraft today.
Powerful and reliable, although expensive.

The Rotax 912 S is a 100 Horsepower engine.
The 912 RST model uses the same 80 HP Rotax engine used in the 914. This engine has been fitted with a Mitsubishi Turbo that gives full time turbo boost. At full power this engine develops 122 Horsepower and is excellent for heavier loads or high altitudes.

Gallery

912 UL 2V DCDI
Cycle: 4
No cylinders: 4
Bore: 79.5 mm
Stroke: 61 mm
Compression: 9
Displacement: 1211 cc
Cooling: liquid-air
Ignition: Electronic Ducati
Reduction: mechanical 2.27:1 torque limited
Weight: 64.5 kg
Max pwr: 80 hp at 5500 rpm
Max torque: 103 at 4800 rpm
Fuel consumption: 240 G/hp/hr
Price 1998: 69 919,28 Fttc

The Rotax 618 is a 73.8 hp (55 kW) two-stroke, two-cylinder, liquid cooled, gear reduction-drive engine that was formerly manufactured by BRP-Rotax GmbH & Co. KG. It was designed for use on ultralight aircraft.

The 618 features liquid-cooled cylinder heads and cylinders with a rotary valve inlet and an exhaust valve. Cooling is via one or two externally-mounted radiators. Lubrication is by use of pre-mixed fuel and oil at 50:1 or oil injection. The 618 has dual Ducati capacitor discharge ignition systems and is equipped with two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure.

The engine’s propeller drive is via a Rotax type C or E style gearbox. The standard engine includes a muffler exhaust system and an intake silencer and filter, with an after muffler also available to further reduce engine noise. The standard starter is an electric starter. An integral alternating current generator produces 12 volts and 200 watts.

The Rotax 618 is no longer in production.

Applications:
Acrolite
ARV Griffin
Bede BD-5
Blue Yonder Merlin
Earthstar Thunder Gull JT2
Early Bird Jenny
Fletcher Hercules
Joplin Tundra
Kolb Mark III
Kolb Slingshot
Laron Wizard
Microleve Corsario
Microleve ML 450
M-Squared Breese
Murphy Renegade
Quicksilver GT500
Rainbow Aerotrike
Sea-Bow International Sea-Bow
Titan Tornado

Specifications:
Rotax 618
Type: 2-cylinder, 2-stroke, rotary valve, oil-in-fuel or oil-injected lubrication, dual carburetors, dual ignition
Bore: 76 mm (2.99 in)
Stroke: 68 mm (2.68 in)
Displacement: 617 cc (37.65 cu in)
Dry weight: 59.1 kg 130.4 lb with electric starter, two carburetors, radiator, intake silencer, exhaust system and E gearbox
Valvetrain: rotary inlet valve, exhaust valve
Fuel type: premium unleaded: RON 90 octane or higher leaded or unleaded or AVGAS 100 LL
Oil system: oil-in-fuel (pre-mix) at 50:1
Cooling system: liquid cooled
Power output: 55 kW 73.4 HP SAE @ 6750 RPM
Power-to-weight ratio: 0.56 hp/lb (1.07 kg/kW)

618 2V DCDI
Cycle: 2
No cylinders: 2
Bore: 76 mm
Stroke: 68 mm
Compression: 5.75
Displacement: 618 cc
Cooling: Liquid
Ignition: Electronic Ducati
Reduction: Gear ‘C’ or ‘E’ 2.62-4
Weight: 48.7 kg
Max pwr: 74.8 hp at 6750 rpm
Max torque: 80 at 6500 rpm
Fuel consumption: 340 G/hp/hr
Price 1998: 35 785,00 Fttc

The Rotax 582 is a 48 kW (64 hp) two-stroke, two-cylinder, rotary intake valve, oil-in-fuel or oil injection pump, liquid-cooled, gear reduction-drive aircraft engine manufactured by BRP-Rotax GmbH & Co. KG. It is for use in non-certified aircraft operating in day visual flight rules.

The Rotax 582 is based upon the earlier Rotax 532 engine design and was designed for use ultralight aircraft. The 582 increased the bore from the 532 engine’s 72 to 76 mm (2.8 to 3.0 in) and increased the stroke from 61 to 64 mm (2.4 to 2.5 in). This increased the displacement from 521.2 cc (31.81 cu in) to 580.7 cc (35.44 cu in), an increase of 11%. The increased displacement had the effect of flattening out the 532’s torque curve and allowed the 582 to produce useful power over a wider rpm range. Reliability over the 532 was also improved.

The 582 features liquid-cooled cylinder heads and cylinders with a Rotary Intake Valve. Cooling is via an externally-mounted radiator. Lubrication is either by use of pre-mixed fuel and oil or oil injection from an externally-mounted oil tank. The 582 has dual independent breakerless, magneto capacitor discharge ignition (CDI) systems and is equipped with 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.

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.”

Applications:
Acrolite
Advanced Aeromarine Buccaneer II
Aero Adventure Aventura HP & Sport
AeroLites AeroMaster AG
AeroLites Bearcat
Aeroprakt A-20
Aeros-2
Aeros Cross Country
Aeros del Sur Manta
Aerosette MH-46 Eclipse
Aéro Services Guépard Guépe
Airbet Girabet
Airborne Edge
Airborne Outback
Airborne XT
Air Command Commander Elite
Air Creation GT
Air Creation Racer
Air Creation Skypper
Air Creation Tanarg
Airdrome Dream Fantasy Twin
Airdrome Fokker DR-1
Airkraft Sunny
Airsport Sonet
Alliant Destiny Fusion
Alliant Destiny XLT
Anglin J6 Karatoo
Antares MA-32
Antonov T-2M Maverick
Apex Dolphin 3
Apollo Delta Jet
Apollo Fox
Apollo Jet Star
Apollo Monsoon
Apollo Racer GT
Aquilair Kid
Aquilair Swing
Arnet Pereyra Sabre II
ASAP Chinook Plus II
ASAP RX 550 Plus Beaver
ATEC 212 Solo
Australian Lightwing GR 582
Aviasouz Cruise
Aviasud Mistral
Aviate Raptor
Aviation Products Star Trike
Avid Catalina
Avid Flyer
Avio Design Swan
BAaer Guri
BB Microlight BB-two seater
Biplanes Of Yesteryear Mifyter
Blue Yonder EZ Flyer
Blue Yonder Merlin
Brock KB-3
Buckeye Endeavor
Buzzman L’il Buzzard
Capella XS
Capella T-Raptor
Carlson Sparrow
Celier Kiss
CFM Shadow
Chernov Che-25
Circa Reproductions Nieuport 12
CGS Hawk
Club ULM Rotor Ptenets-2
Cosmos Phase II
Cyclone AX2000
DAR 21 Vector II
DAR-23
Denney Kitfox Model 2
DTA Evolution
DTA Feeling
Earthstar Thunder Gull JT2
Early Bird Jenny
Ehroflug Coach II S
Euro Fly Flash Light
Eurofly Viper
Excalibur Aircraft Excalibur
Fantasy Air Allegro
Fisher Classic
Fisher Super Koala
Fletcher Hercules
Flightstar
Flight Team Spider
Fly Air Swallow
Flying Machines FM301
Flylab Tucano
Fly Synthesis Catalina
Fly Synthesis Wallaby
FMP Qualt 201
Freedom Lite SS-11 Skywatch
FUL MA 30 Graffiti
Gdecouv’R 582
General Aviation Design Bureau T-32 Maverick
Gidroplan Che-22 Korvet
Gidroplan Tsikada
Golden Circle Air T-Bird
Guerpont Autoplum
Harmening High Flyer
Heldeberg Marathon
Houde Speedmax
Humbert La Moto Du Ciel
Hy-Tek Hurricane Hauler
InterPlane Skyboy
J & J Ultralights Seawing
Joplin Tundra
Jora Jora
Junkers Profly Junkers Trike
Kolb Kolbra
Kolb Mark III
Kolb Slingshot
Kolb Tandem
Kompol Jazz
Krasniye Kryl’ya Deltacraft MD-50C
Laron Wizard
Layzell Merlin
Light Miniature Aircraft LM-1
Light Miniature Aircraft LM-5
Lockwood Drifter MU582
Magni M-18 Spartan
Mainair Blade
Mainair Rapier
Mariner Aircraft Mariner
Masquito M58
Micro Aviation B22 Bantam
Microleve Corsario
Microleve ML 450
Microleve ML 500
Moyes Dragonfly
M-Squared Breese
Murphy Maverick
Murphy Renegade
Nickel & Foucard NF-2 Asterix
Norman Aviation J6 Karatoo
Norman Aviation Nordic II
North American Rotorwerks Pitbull SS
North Wing Apache
North Wing Sport X2
Paladin Golden Eagle
Para-Ski VX
Para-Ski XS
Peak Aerospace Me 109
Pegasus Quantum
Personal Flight Sky-Tender
Phantom X1
Polaris AM-FIB
Polaris FIB
Polaris Skin
Powrachute Pegasus
PowerTrike Evolution
PowerTrike II
Precision Tech Fergy
Quad City Challenger II
Quander Airpfeil
Quicksilver GT500
Quicksilver Sport 2S
Rainbow Aerotrike
Rainbow Cheetah
Raj Hamsa X-Air
Ramphos Trident
Rans S-6 Coyote II
Rans S-7 Courier
Rans S-9 Chaos
Rans S-10 Sakota
Rans S-11 Pursuit
Rans S-12 Airaile
Revolution Mini-500 helicopter
Rolandas Kalinauskas RK-6 Magic
Schmidtler Enduro
Sea and Sky Cygnet
Sea-Bow International Sea-Bow
Six Chuter SR1
Six Chuter SR7
Skyfly S-34 Skystar
Skyrider Sonic
Skyrider Stingray
SlipStream Genesis
Solo Wings Aquilla
Sport Copter Vortex
Skywatch SS11
Spectrum Beaver RX 650
Sport Flight Talon
Summit 2
Summit Steel Breeze
S-Wing Swing
TechProAviation Merlin 100
TeST TST-6 Duo
Thruster T600 Sprint
Tiger Club Development Sherwood Ranger
Titan Tornado
TL Ultralight TL-32 Typhoon
Vol Xerpa ULM Pulsar
World Seair Corp Seair
Y2Fly Seahawk
Zenith STOL CH 701

Specifications:
Rotax 582
Type: two-cylinder, two-stroke, rotary valve, oil-in-fuel or oil-injected lubrication, dual carburetors, electronic dual ignition
Bore: 76 mm (2.99 in)
Stroke: 64 mm (2.52 in)
Displacement: 580.7 cc (35.44 cu in)
Dry weight: 50 kg 110 lb with electric starter, carburetors, fuel pump, air filters and reduction gear
Fuel type: premium unleaded: RON 90 octane or higher leaded or unleaded or AVGAS 100 LL
Oil system: oil-in-fuel (pre-mix) or oil injection
Cooling system: liquid cooled
Power output: 48 kW 64.4 HP SAE @ 6,500 RPM 1-minute
Compression ratio: 11.5 (theoretical) – 5.75 effective

Rotax 582 Liquid cooled B-Box w/Pull Start : 342 lbs
Rotax 582 Liquid cooled B-Box w/Electric Start and Mag End: 361 lbs
Rotax 582 Liquid cooled E-Box w/Electric Start: 363 lbs

E-Box (Electric Start on Gear Box)

582 UL 2V DCDI
Cycle: 2
No cylinders: 2
Bore: 76 mm
Stroke: 64 mm
Compression: 5.75
Displacement: 580.7 cc
Cooling: Liquid
Ignition: Electronic Ducati
Reduction: Mechanical Gear ‘B’ ‘C’ or ‘E’
Reduction ratio: 2-4:1
Weight: 41.6 kg
Max pwr: 64.8 hp at 6500 rpm
Max torque: 75 at 6000 rpm
Fuel consumption: 340 g/hp/hr
Price 1998: 26 833,50 Fttc

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.

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.

Rotax 377 / 447 / 503 Manual

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)

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

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

Rotax 377 / 447 / 503 Manual

447 UL 2V DCDI
Cycle: 2
No cylinders: 2
Bore: 67.5 mm
Stroke: 61 mm
Compression: 6.3
Displacement: 436.5 cc
Cooling: Air
Ignition: Electronic Ducati
Reduction: Mechanical Gear ‘B’ ‘C’ or ‘E’
Reduction ratio: 2-4:1
Weight: 38 kg
Max pwr: 41.6 hp at 6500 rpm
Max torque: 47 at 6000 rpm
Fuel consumption: 360 g/hp/hr
Price 1998: 14 378,54 Fttc