Engines · two-cycle piston · data as of October 5, 2026

Rotax 503 DCDI

560 aircraft on the U.S. register carry a Rotax 503 DCDI engine, rated at about 52 horsepower. The Quad City Ultralight Acft Corp CHALLENGER II is the model most often fitted with it (22 aircraft). The aircraft carrying it were built between 1983 and 2025.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Rotax 503 DCDI. FAA spelling: 503 DCDI.

Fitted to model families

Quad City Ultralight Acft Corp CHALLENGER II22Quicksilver GT-40011Kolb FIRESTAR II7Quad City Ultralights CHALLENGER II7Airborne REDBACK5Kolb Aircraft FIRESTAR II5Aerotrike SAFARI4Kolb FIRESTAR4Quad City CHALLENGER II4Air Creation TWIN3Cosmos BISON3Cosmos PHASE II3

Quad City Ultralight Acft Corp CHALLENGER II · Quicksilver GT-400 · Kolb FIRESTAR II · Quad City Ultralights CHALLENGER II · Airborne REDBACK · Kolb Aircraft FIRESTAR II · Aerotrike SAFARI · Kolb FIRESTAR · Quad City CHALLENGER II · Air Creation TWIN

Where they are owner's state

Wisconsin36California35Texas34Florida31Illinois25Alabama25Washington22Georgia22Michigan17Ohio16

Kind of aircraft

Piston singles427 (76%)Weight-shift and powered parachutes120 (21%)Helicopters7 (1%)Gyroplanes3 (0.5%)Gliders3 (0.5%)

When the aircraft were built by decade

Connections how this engine series links to the rest of the register

Fitted to

Quad City Ultralight Acft Corp CHALLENGER II 22 with this engine series
Quicksilver GT-400 11 with this engine series
Kolb FIRESTAR II 7 with this engine series
Quad City Ultralights CHALLENGER II 7 with this engine series
Airborne REDBACK 5 with this engine series
Kolb Aircraft FIRESTAR II 5 with this engine series
Aerotrike SAFARI 4 with this engine series
Kolb FIRESTAR 4 with this engine series

Where they are

Wisconsin 36 of these aircraft
California 35 of these aircraft
Texas 34 of these aircraft
Florida 31 of these aircraft
Illinois 25 of these aircraft

Biggest operators

Evolution Aircraft INC 2 of these aircraft

Analytics

These connections as data: /graph/engine/rotax-503-dcdi.json · about the eFlight graph.

Aircraft newest certificates first · 560

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N93331	Hickey Jerry E SLINGSHOT	Fixed-wing, single engine	Individual owner Kansas	Experimental	2009-09-08	Valid
N9546J	M-Squared Aircraft BREESE	Fixed-wing, single engine	Individual owner Mississippi	Experimental	2009-08-28	Valid
N877MW	Windschitl Mike CHALLENGER II	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2009-08-17	Valid
N46LR	Liles Robert G SPITFIRE	Fixed-wing, single engine	Individual owner Texas	Experimental	2009-08-12	Valid
N379PX	Anderson Donald A CHALLENGER II	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2009-05-19	Valid
N702RP	Mira Ronald CHALLENGER II	Fixed-wing, single engine	Individual owner Michigan	Experimental	2009-04-14	Valid
N61118	Myers Merlin W HAWK 1	Fixed-wing, single engine	Individual owner Maryland	Experimental	2009-03-16	Valid
N609GP	Mcnulty Gary J CHALLENGER II	Fixed-wing, single engine	Individual owner Washington	Experimental	2008-10-16	Valid
N35150	Quicksilver MX-2	Fixed-wing, single engine	Co-owned owner Missouri	Experimental	2008-09-10	Valid
N80360	Quicksilver GT-400	Fixed-wing, single engine	Individual owner Alabama	Experimental	2008-08-21	Valid
N774DR	Brown Bill L PIPISTREL SPIDER TRI	Weight-shift control	Individual owner Texas	Experimental	2008-08-14	Valid
N217BE	Eves Bryan E HAWK ARROW II	Fixed-wing, single engine	Individual owner Ohio	Experimental	2008-08-07	Valid
N503FC	Soma GYROCOPTER SGL SEAT	Gyroplane	Individual owner Florida	Experimental	2008-07-30	Valid
N800LW	Wilson Leslie BENTLY	Rotorcraft	Individual owner Mississippi	Experimental	2008-07-23	Valid
N7012P	Six Chuter SR2	Powered parachute	Individual owner Oklahoma	Experimental	2008-07-09	Valid
N71703	Stoner Richard E CHALLENGER II	Fixed-wing, single engine	Individual owner Florida	Experimental	2008-05-09	Valid
N605DH	Hall Dennis L CHALLENGER II	Fixed-wing, single engine	Luedders and Reed INC Pawnee City, Nebraska	Experimental	2008-03-05	Valid
N142KJ	Ems Kenneth R CHALLENGER II	Fixed-wing, single engine	Individual owner Mississippi	Experimental	2008-01-30	Valid
N110ZX	Hardesty Eugene P EXCALIBUR	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2008-01-18	Valid
N2610T	Quad City Ultralights CHALLENGER II	Fixed-wing, single engine	Individual owner Maryland	Experimental	2008-01-14	Valid
N951GL	Linzmayer George John B1B BUCCANEER	Fixed-wing, single engine	Individual owner Florida	Experimental	2008-01-09	Valid
N4406K	Kolb KOLB FIRESTAR KXP	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2007-12-21	Valid
N8607Z	Quicksilver SPRINT II	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2007-12-21	Valid
N4407G	Murray Mark J HURRICANE	Fixed-wing, single engine	Individual owner Georgia	Experimental	2007-12-20	Valid
N75504	Spectrum BEAVER RX 550	Fixed-wing, single engine	Individual owner Mississippi	Experimental	2007-11-29	Valid
N9473Y	Quad City CHALLENGER II	Fixed-wing, single engine	Individual owner Indiana	Experimental	2007-11-14	Valid
N134PC	Harmenings High Flyer HIGH FLYER DELUXE	Powered parachute	Individual owner New York	Experimental	2007-11-05	Valid
N5698L	Ferguson Aircraft FERGY II	Fixed-wing, single engine	Individual owner Georgia	Experimental	2007-10-30	Valid
N4702T	Carlin David 6T-1004	Fixed-wing, single engine	Individual owner California	Experimental	2007-10-26	Valid
N935FS	Sabre Aircraft Inc SABRE 503	Weight-shift control	Individual owner Tennessee	Experimental	2007-10-19	Valid
N56839	Colstrup Dennis J CHALLENGER I	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2007-10-18	Valid
N171DA	Addison Don G QUICKSILVER SPORT II	Fixed-wing, single engine	Individual owner Alabama	Experimental	2007-10-17	Valid
N56419	Berencsi Tibor C KOLB FIRESTAR I	Fixed-wing, single engine	Individual owner New Jersey	Experimental	2007-10-17	Valid
N3803V	Quicksilver SPRINT	Fixed-wing, single engine	Individual owner Mississippi	Experimental	2007-10-09	Valid
N755WB	Black James M FLIGHTSTAR II SL	Fixed-wing, single engine	Individual owner North Carolina	Experimental	2007-10-09	Valid
N207XP	American Aircraft FALCON XP	Fixed-wing, single engine	Individual owner Tennessee	Experimental	2007-10-05	Valid
N2967A	Smith James G QUICKSILVER GT 400	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-10-04	Valid
N441MS	Schumacher Michael CHALLENGER II	Fixed-wing, single engine	Individual owner Illinois	Experimental	2007-10-04	Valid
N5622J	Excalibur EXCALIBUR/EXPER	Fixed-wing, single engine	Individual owner New York	Experimental	2007-10-03	Valid
N580DC	Quicksilver Aircraft MXL SPORT	Fixed-wing, single engine	Individual owner Oregon	Experimental	2007-10-03	Valid
N152UL	North Wing Ultralight Products APACHE SPORT	Weight-shift control	Individual owner Oregon	Experimental	2007-09-28	Valid
N1284D	Sixchuter AC-SR-2	Powered parachute	Individual owner Washington	Experimental	2007-09-27	Valid
N153JC	Aircraft Sales And Parts CHINOOK PLUS 2/A	Fixed-wing, single engine	Individual owner Michigan	Experimental	2007-09-25	Valid
N2145W	Antares MA-33	Weight-shift control	Individual owner Alaska	Experimental	2007-09-21	Valid
N3739V	Ford Bill CHALLENGER II	Fixed-wing, single engine	Individual owner Indiana	Experimental	2007-09-21	Valid
N6118N	Eipper Aircraft QUICKSILVER MXII	Fixed-wing, single engine	Individual owner Alabama	Experimental	2007-09-21	Valid
N5611V	Quad City CHALLENGER II	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-09-19	Valid
N6173B	Northwing NAVAJO	Weight-shift control	Individual owner Alabama	Experimental	2007-09-18	Valid
N26346	Northwing APACHE TRIKE	Weight-shift control	Individual owner California	Experimental	2007-09-13	Valid
N817RS	Smith Ronald C CHALLENGER II	Fixed-wing, single engine	Individual owner Indiana	Experimental	2007-09-10	Valid
N197AB	Quad City Ultralight Acft Corp CHALLENGER II	Fixed-wing, single engine	Individual owner Nebraska	Experimental	2007-09-06	Valid
N5509L	Rans COYOTE	Fixed-wing, single engine	Individual owner Illinois	Experimental	2007-09-06	Valid
N4741G	Smith George E CHALLENGER II	Fixed-wing, single engine	Individual owner Oklahoma	Experimental	2007-09-05	Valid
N446RC	Cronk Russell 1650	Fixed-wing, single engine	Individual owner California	Experimental	2007-09-04	Valid
N2587T	Loehle Aviation Inc SPORT PARASOL	Fixed-wing, single engine	Individual owner Virginia	Experimental	2007-08-29	Valid
N2617E	Destiny Powered Parachutes Llc DESTINY 2000	Powered parachute	Individual owner Alabama	Experimental	2007-08-29	Valid
N2641T	Carter David W TUKAN	Weight-shift control	Individual owner Alaska	Experimental	2007-08-29	Valid
N2643T	Hudgins John M CHALLENGER II	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-08-29	Valid
N503MS	Kolb Aircraft FIRESTAR II	Fixed-wing, single engine	Individual owner Tennessee	Experimental	2007-08-29	Valid
N177RM	Kolb TWINSTAR MARK II	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-08-27	Valid
N179RD	Dooley Rhett A TUKAN	Weight-shift control	Individual owner Colorado	Experimental	2007-08-27	Valid
N1780C	Earthstar Acft Inc JD	Fixed-wing, single engine	Individual owner Oregon	Experimental	2007-08-24	Valid
N197A	Harvey John A J&J TUKAN TRIKE	Weight-shift control	Individual owner Tennessee	Experimental	2007-08-24	Valid
N2157	J&J Ultralights SEA WING	Weight-shift control	Individual owner Illinois	Experimental	2007-08-24	Valid
N3519Q	Berry Bob A KOLB FIRESTAR II	Fixed-wing, single engine	Individual owner Kentucky	Experimental	2007-08-24	Valid
N5244A	Flight Star Inc II SC	Fixed-wing, single engine	Individual owner Georgia	Experimental	2007-08-24	Valid
N703RC	Cooper Randy D CHALLENGER II	Fixed-wing, single engine	Individual owner Ohio	Experimental	2007-08-24	Valid
N3503U	Strickler Dennis L MXL SPORT II	Fixed-wing, single engine	Individual owner Ohio	Experimental	2007-08-23	Valid
N35234	Airborne Windsports Pty Ltd EDGE X	Weight-shift control	Individual owner New Hampshire	Experimental	2007-08-22	Valid
N1689	Cosmos BISON	Weight-shift control	Individual owner Washington	Experimental	2007-08-21	Valid
N3064L	Pegasus QUANTUM 503 SPORT	Weight-shift control	Individual owner Georgia	Experimental	2007-08-17	Valid
N6147X	Quicksilver Manufacturing Inc SPORT II	Fixed-wing, single engine	Individual owner Florida	Experimental	2007-08-17	Valid
N61529	Harmening HIGH FLYER	Powered parachute	Individual owner Michigan	Experimental	2007-08-17	Valid
N61634	Daus Charles J QUICKSILVER	Fixed-wing, single engine	Individual owner Pennsylvania	Experimental	2007-08-17	Valid
N6129Q	Alliant Aviation PARACRAFT	Powered parachute	Individual owner Illinois	Experimental	2007-08-13	Valid
N7894K	Lockepaddon Kenneth APACHE	Weight-shift control	Individual owner California	Experimental	2007-08-06	Valid
N80274	Jackson Andrew W QUICKSILVER SPORT II	Fixed-wing, single engine	Individual owner Georgia	Experimental	2007-08-06	Valid
N8039Y	Airborne REDBACK	Weight-shift control	Individual owner Arizona	Experimental	2007-08-06	Valid
N2493U	Kolb FIRESTAR II	Fixed-wing, single engine	Individual owner Florida	Experimental	2007-08-03	Valid
N51726	Bill Robert HERCULES TRIKE	Weight-shift control	Individual owner California	Experimental	2007-08-03	Valid
N6176C	Krucker Manufacturing Ltd KALYPSO	Weight-shift control	Individual owner Maryland	Experimental	2007-08-03	Valid
N7031U	Six Chuter SKYE RYDER SR-7	Powered parachute	Co-owned owner New Mexico	Experimental	2007-08-02	Valid
N395TX	Mcmillan Dennis C PHANTOM I	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-07-30	Valid
N80812	Ackland Les E TITAN	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2007-07-30	Valid
N8049F	Golden Circle Air T-BIRD I	Fixed-wing, single engine	Individual owner Texas	Experimental	2007-07-27	Valid
N80559	Seal Jerry W CAPELLA SS	Fixed-wing, single engine	Individual owner Louisiana	Experimental	2007-07-27	Valid
N8000Q	Kolb FIRESTAR 2	Fixed-wing, single engine	Individual owner Indiana	Experimental	2007-07-26	Valid
N8038Q	Quicksilver SPRINT	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2007-07-26	Valid
N80450	Kolb FIRESTAR	Fixed-wing, single engine	Individual owner California	Experimental	2007-07-26	Valid
N881K	Quicksilver Manufacturing MX SPORT	Fixed-wing, single engine	Individual owner Idaho	Experimental	2007-07-26	Valid
N293JP	Quad City Ultralight Acft Corp CHALLENGER II	Fixed-wing, single engine	Individual owner Oklahoma	Experimental	2007-07-24	Valid
N503PG	Sabre Aircraft Corp 503	Weight-shift control	Individual owner California	Experimental	2007-07-24	Valid
N59MF	Heldeberg Designs Llc MARATHON	Powered parachute	Individual owner New York	Experimental	2007-07-24	Valid
N83BK	Koza William J TIERRA	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2007-07-23	Valid
N518EE	Quicksilver MXL-II-VANT	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2007-07-16	Valid
N92076	Quad City Ultralight CHALLENGER	Fixed-wing, single engine	Individual owner Illinois	Experimental	2007-07-06	Valid
N998CW	Olbrich Charles W CGS HAWK ARROW	Fixed-wing, single engine	Individual owner New York	Experimental	2007-06-27	Valid
N2494Y	Kesler Gilbert L Jr AEROTRIKE	Weight-shift control	Individual owner Colorado	Experimental	2007-06-22	Valid
N5148R	Highcraft Aeromarine BUCCANEER XA	Fixed-wing, single engine	Individual owner Florida	Experimental	2007-06-21	Valid
N599WD	Maxair XP 503	Fixed-wing, single engine	Individual owner Mississippi	Experimental	2007-06-15	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.