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
N348SM	Monacelli Russell MONACELLI CHI	Fixed-wing, single engine	Co-owned owner Wisconsin	Experimental	2020-10-22	Valid
N453MJ	Jarvis Michael C CGS HAWK SS ARROW	Fixed-wing, single engine	Individual owner Indiana	Experimental	2020-10-21	Valid
N829BH	Aeros Ltd SKYRANGER	Fixed-wing, single engine	Individual owner Maine	Light sport	2020-10-21	Valid
N9128Y	Dickert Chris K CHALLENGER II	Fixed-wing, single engine	Individual owner Indiana	Experimental	2020-09-23	Valid
N414LS	Stokes Leslie Ray CHALLENGER II	Fixed-wing, single engine	Individual owner Oklahoma	Experimental	2020-09-10	Valid
N510RA	Phantom Aeronautics PHANTOM X-1	Fixed-wing, single engine	Individual owner Tennessee	Experimental	2020-09-08	Valid
N3638D	Maler Carl J CHALLENGER II	Fixed-wing, single engine	Individual owner California	Experimental	2020-08-22	Valid
N148LS	Quad City Ultralight CHALLENGER II	Fixed-wing, single engine	Kuwait International Aircraft Leasing INC Wilmington, Delaware	Experimental	2020-08-15	Valid
N8614Z	Aerotrike SAFARI	Weight-shift control	Co-owned owner Indiana	Experimental	2020-08-13	Valid
N129AY	Yarberry Manuel CHALLENGER II	Fixed-wing, single engine	Individual owner New Hampshire	Experimental	2020-07-13	Valid
N53XY	Schwartz Kenneth G S17 STINGER	Fixed-wing, single engine	Individual owner California	Experimental	2020-07-06	Valid
N327SL	Flightstar 2-SC	Fixed-wing, single engine	Individual owner Pennsylvania	Experimental	2020-06-18	Valid
N3176G	Quicksilver GT-400	Fixed-wing, single engine	Individual owner Texas	Experimental	2020-06-08	Valid
N8109	Russell Haney H CHALLENGER II	Fixed-wing, single engine	Individual owner New Hampshire	Experimental	2020-05-15	Valid
N75499	J&J Tukan TUKAN503	Weight-shift control	Individual owner Utah	Experimental	2020-03-18	Valid
N8560R	Airborne Windsports REDBACK	Weight-shift control	Smooth Flyers LLC Athens, Georgia	Experimental	2020-03-13	Valid
N744DL	Loucks Barner D 1650R EROS	Fixed-wing, single engine	Individual owner Washington	Experimental	2020-03-02	Valid
N30PV	Vital Syd G QUICKSILVER GT 400	Fixed-wing, single engine	Individual owner Texas	Experimental	2020-02-12	Valid
N219CN	Quicksilver Mfg Co MXLII	Fixed-wing, single engine	Individual owner Puerto Rico	Experimental	2020-01-31	Valid
N8607E	Blake Robert E CHALLENGER 2	Fixed-wing, single engine	Pelikan Baye Aviation LLC Saint Charles, Missouri	Experimental	2020-01-27	Valid
N2480Y	Brown Benjamin C CHALLENGER II	Fixed-wing, single engine	Individual owner New Mexico	Experimental	2020-01-10	Valid
N9511P	Quaker State Powered Parachute JOF11150	Powered parachute	Cessna 20420 Holding LLC Philadelphia, Pennsylvania	Experimental	2020-01-03	Valid
N827BA	Quad City Ultralight CHALLENGER II LSS	Fixed-wing, single engine	Individual owner Texas	Experimental	2019-12-16	Valid
N797HS	Harmening HIGH FLYER	Powered parachute	Individual owner New York	Experimental	2019-12-10	Valid
N947BX	Bertling Courtney MXL-2	Fixed-wing, single engine	Individual owner Oregon	Experimental	2019-12-04	Valid
N1113W	Suarez R Murray RIDGE RUNNER III	Fixed-wing, single engine	Individual owner Vermont	Experimental	2019-10-29	Valid
N102JC	Antares MA-32R503	Weight-shift control	Individual owner Arizona	Experimental	2019-10-24	Valid
N742K	Kinney Richard M Jr AEROS-2	Weight-shift control	Individual owner Kentucky	Experimental	2019-09-26	Valid
N29990	Titan Aircraft TORNADO	Fixed-wing, single engine	Individual owner South Carolina	Experimental	2019-09-18	Valid
N8756V	Sensenig Vicki L T E A M HI-MAX 1700R	Fixed-wing, single engine	Individual owner New Mexico	Experimental	2019-09-18	Valid
N678DT	Pegasus Aviation QUANTUM SUPER SPORT	Weight-shift control	Individual owner New Mexico	Experimental	2019-09-11	Valid
N44152	Challenger 2PCWS	Fixed-wing, single engine	Individual owner Nebraska	Experimental	2019-09-10	Valid
N864RC	Quad City Ultralight Acft Corp CHALLENGER II	Fixed-wing, single engine	Individual owner South Carolina	Experimental	2019-08-28	Valid
N939WT	Thomas Wayne F EXCALIBUR II	Fixed-wing, single engine	Co-owned owner Nebraska	Experimental	2019-08-16	Valid
N444FB	Bower Frederick S DOMINATOR	Rotorcraft	Individual owner Michigan	Experimental	2019-07-31	Valid
N4430A	Newsome Winfred T KOLB FIRESTAR	Fixed-wing, single engine	Individual owner Pennsylvania	Experimental	2019-07-24	Valid
N8507T	Paul Donald R CHINOOK PLUS II	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2019-06-29	Valid
N6123E	Phantom Aircraft Co PHANTOM X-1	Fixed-wing, single engine	Individual owner New Jersey	Experimental	2019-06-25	Valid
N434LB	Brandt Leroy E BRANDT LEROY E 2PL	Fixed-wing, single engine	Individual owner North Carolina	Experimental	2019-05-30	Valid
N241PW	Pappas Chris A GT-400	Fixed-wing, single engine	Individual owner Alabama	Experimental	2019-04-29	Valid
N521DK	Koshinski David A AVENTURA HP	Fixed-wing, single engine	Signmaxx LLC Larksville, Pennsylvania	Experimental	2019-04-18	Valid
N459F	John R Fitt KOLB FIRESTAR	Fixed-wing, single engine	Individual owner California	Experimental	2019-04-05	Valid
N140JL	Loomis John C RANS S-14	Fixed-wing, single engine	Individual owner Oregon	Experimental	2019-02-23	Valid
N969EL	Leither Ernest L CHALLENGER II	Fixed-wing, single engine	Individual owner Iowa	Experimental	2019-01-31	Valid
N3551D	Cgs Aviation CGS HAWK CLASSIC	Fixed-wing, single engine	Individual owner Ohio	Experimental	2019-01-17	Valid
N60101	Aquilair AQUILAIR	Weight-shift control	Individual owner Florida	Experimental	2019-01-10	Valid
N9923C	Quisenberry Scott RIDGE RUNNER II	Fixed-wing, single engine	Fincher Brandon J Marietta, Oklahoma	Experimental	2018-12-26	Valid
N320CK	Klemp Gregory J Sr CHALLENGER 1	Fixed-wing, single engine	Individual owner Ohio	Experimental	2018-12-15	Valid
N43132	Eddy James E CHALLENGER II	Fixed-wing, single engine	Individual owner Indiana	Experimental	2018-11-30	Valid
N80466	Quad City Ultralights CHALLENGER II	Fixed-wing, single engine	Co-owned owner Missouri	Experimental	2018-10-30	Valid
N315TC	Steichen Lyle C TIGER CUB	Fixed-wing, single engine	Individual owner Minnesota	Experimental	2018-10-04	Valid
N43TG	Robinson Kent A TUKAN	Weight-shift control	Individual owner Texas	Experimental	2018-10-02	Valid
N528PG	Airborne REDBACK	Weight-shift control	Individual owner Oregon	Experimental	2018-09-14	Valid
N90779	Quicksilver MXL II	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2018-09-10	Valid
N279JD	Duffy John F KOLB MARK III	Fixed-wing, single engine	Individual owner Massachusetts	Experimental	2018-08-31	Valid
N503BP	Peterson Bill KOLB FIRESTAR	Fixed-wing, single engine	Individual owner Nevada	Experimental	2018-08-29	Valid
N608VS	Sensenig-Belisle Vickie L CHALLENGER 2P	Fixed-wing, single engine	Individual owner New Mexico	Experimental	2018-08-23	Valid
N7009J	Kolb Aircraft FIRESTAR II	Fixed-wing, single engine	Individual owner Texas	Experimental	2018-08-15	Valid
N5180N	Rans RANS S-9	Fixed-wing, single engine	Individual owner Illinois	Experimental	2018-08-08	Valid
N304RT	Cgs Aviation CLASSIC	Fixed-wing, single engine	Individual owner Oklahoma	Experimental	2018-08-02	Valid
N9132V	Quad City Ultralights CHALLENGER II	Fixed-wing, single engine	Individual owner Ohio	Experimental	2018-06-21	Valid
N993WB	Brooks W Barr CHALLENGER II	Fixed-wing, single engine	Individual owner Delaware	Experimental	2018-06-11	Valid
N949UX	Quad City Ultralights CHALLENGER II	Fixed-wing, single engine	Different Auto LLC Twin Falls, Idaho	Experimental	2018-05-11	Valid
N35023	Buckeye PPC 2 PLACE 503	Powered parachute	Individual owner Michigan	Experimental	2018-04-23	Valid
N6153X	Asap CHINOOK PLUS 2	Fixed-wing, single engine	Co-owned owner Oregon	Experimental	2018-04-05	Valid
N797AK	Airborne REDBACK	Weight-shift control	Individual owner Tennessee	Experimental	2018-03-22	Valid
N373RF	Fairchild Ralph B CHALLENGER II	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2018-03-14	Valid
N3284Q	Marks Robert E CHALLENGER II	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2018-01-17	Valid
N8058P	Sellars Robert L CLIPPER	Fixed-wing, single engine	Individual owner Louisiana	Experimental	2017-12-19	Valid
N503MB	Brouillette Michael Elric T2	Powered parachute	Individual owner Mississippi	Experimental	2017-11-28	Valid
N4834F	Six Chuter SR2	Powered parachute	Individual owner Wisconsin	Experimental	2017-11-02	Valid
N231TA	Denoyer Mark A CHALLENGER II	Fixed-wing, single engine	Individual owner Arizona	Experimental	2017-10-12	Valid
N620WC	Anderson Jason W CHALLENGER 2	Fixed-wing, single engine	Individual owner Wisconsin	Experimental	2017-10-05	Valid
N18VE	M-Squared Aircraft BREESE 2	Fixed-wing, single engine	Sky Knights Flight Club Thousand Oaks, California	Experimental	2017-09-28	Valid
N512D	Courtney David M CHALLENGER II CWS	Fixed-wing, single engine	Individual owner Montana	Experimental	2017-09-27	Valid
N9957H	Hilton David L AVID AIRCRAFT MODL B	Fixed-wing, single engine	Individual owner North Carolina	Experimental	2017-08-24	Valid
N25686	Tackabury Susan M CHALLENGER II	Fixed-wing, single engine	Individual owner Illinois	Experimental	2017-08-04	Valid
N826BP	James A Powell F SII	Fixed-wing, single engine	Individual owner Ohio	Experimental	2017-07-31	Valid
N8608Y	Mccallister Shawn CHALLENGER 1	Fixed-wing, single engine	Individual owner North Carolina	Experimental	2017-07-18	Valid
N50681	Rans S-17 STINGER	Fixed-wing, single engine	Individual owner South Carolina	Experimental	2017-06-29	Valid
N522PE	Quad City Ultralight Acft Corp CHALLENGER II	Fixed-wing, single engine	Individual owner Montana	Experimental	2017-06-16	Valid
N929YE	Kolb KOLB MARK II	Fixed-wing, single engine	Individual owner Alabama	Experimental	2017-06-13	Valid
N553FT	Schroeder Derek D CHALLENGER 1 CWS	Fixed-wing, single engine	Individual owner Nebraska	Experimental	2017-05-26	Valid
N31219	Britt George A FERGY F-11B	Fixed-wing, single engine	Individual owner Alabama	Experimental	2017-05-02	Valid
N103HK	Paulus Stephen J SINGLE SEAT CLASSIC	Fixed-wing, single engine	Individual owner Tennessee	Experimental	2017-04-18	Valid
N3773C	Caflisch Peter E CHALLENGER II	Glider	Co-owned owner Wisconsin	Experimental	2017-04-05	Valid
N424RL	Lemon Ronald L ROTOR LIGHTNING	Rotorcraft	Individual owner Washington	Experimental	2017-03-06	Valid
N1509G	Reppert Merlyn R QUICKSILVER MXSPRINT	Fixed-wing, single engine	Individual owner Arizona	Experimental	2017-02-07	Valid
N465CH	Quad City Aircraft CHALLENGER II	Fixed-wing, single engine	Ch20396W1465 LLC Bruce Twp, Michigan	Experimental	2017-01-27	Valid
N2635F	Quicksilver GT-400	Fixed-wing, single engine	Individual owner Oregon	Experimental	2017-01-23	Valid
N2534C	Quicksilver MXL SPORT II	Fixed-wing, single engine	Individual owner Texas	Experimental	2016-12-30	Valid
N153DD	Dennis Lyle Dye KOLB FIRESTAR II	Fixed-wing, single engine	Individual owner Ohio	Experimental	2016-12-12	Valid
N6048X	Mrzena Matthew D COSMOS BISON	Weight-shift control	Individual owner Texas	Experimental	2016-10-24	Valid
N913WW	Airborne EDGE X	Weight-shift control	Individual owner Texas	Experimental	2016-10-21	Valid
N967BC	Quad City CHALLENGER II	Fixed-wing, single engine	Individual owner New York	Experimental	2016-08-25	Valid
N1847	Airborne REDBACK	Weight-shift control	Individual owner Washington	Experimental	2016-08-16	Valid
N3518T	Aman Gary A KOLB FS-2	Fixed-wing, single engine	Individual owner Arizona	Experimental	2016-08-15	Valid
N182EZ	Kolb FIRESTAR 11	Fixed-wing, single engine	Individual owner Massachusetts	Experimental	2016-08-11	Valid
N2543T	Reed James W CHALLENGER II	Fixed-wing, single engine	Individual owner Missouri	Experimental	2016-08-11	Valid
N52PV	Custer George D SP 103	Powered parachute	Individual owner Washington	Experimental	2016-08-11	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.