The register · data as of October 8, 2026

Aircraft with Rotax 503 DCDI engines that are piston singles

427 on the U.S. register, newest registrations first. This is the list behind a number on another page; the words above say exactly what it counts. Individuals are not named at this time; companies, trusts and government bodies are shown as the FAA publishes them.

Tail no.	Maker and model	Owner and base	Certificate	Registered	Status
N3551D	Cgs Aviation CGS HAWK CLASSIC	Individual owner Ohio	Experimental	2019-01-17	Valid
N9923C	Quisenberry Scott RIDGE RUNNER II	Fincher Brandon J Marietta, Oklahoma	Experimental	2018-12-26	Valid
N320CK	Klemp Gregory J Sr CHALLENGER 1	Individual owner Ohio	Experimental	2018-12-15	Valid
N43132	Eddy James E CHALLENGER II	Individual owner Indiana	Experimental	2018-11-30	Valid
N80466	Quad City Ultralights CHALLENGER II	Co-owned owner Missouri	Experimental	2018-10-30	Valid
N315TC	Steichen Lyle C TIGER CUB	Individual owner Minnesota	Experimental	2018-10-04	Valid
N90779	Quicksilver MXL II	Individual owner Wisconsin	Experimental	2018-09-10	Valid
N279JD	Duffy John F KOLB MARK III	Individual owner Massachusetts	Experimental	2018-08-31	Valid
N503BP	Peterson Bill KOLB FIRESTAR	Individual owner Nevada	Experimental	2018-08-29	Valid
N608VS	Sensenig-Belisle Vickie L CHALLENGER 2P	Individual owner New Mexico	Experimental	2018-08-23	Valid
N7009J	Kolb Aircraft FIRESTAR II	Individual owner Texas	Experimental	2018-08-15	Valid
N5180N	Rans RANS S-9	Individual owner Illinois	Experimental	2018-08-08	Valid
N304RT	Cgs Aviation CLASSIC	Individual owner Oklahoma	Experimental	2018-08-02	Valid
N9132V	Quad City Ultralights CHALLENGER II	Individual owner Ohio	Experimental	2018-06-21	Valid
N993WB	Brooks W Barr CHALLENGER II	Individual owner Delaware	Experimental	2018-06-11	Valid
N949UX	Quad City Ultralights CHALLENGER II	Different Auto LLC Twin Falls, Idaho	Experimental	2018-05-11	Valid
N6153X	Asap CHINOOK PLUS 2	Co-owned owner Oregon	Experimental	2018-04-05	Valid
N373RF	Fairchild Ralph B CHALLENGER II	Individual owner Wisconsin	Experimental	2018-03-14	Valid
N3284Q	Marks Robert E CHALLENGER II	Individual owner Wisconsin	Experimental	2018-01-17	Valid
N8058P	Sellars Robert L CLIPPER	Individual owner Louisiana	Experimental	2017-12-19	Valid
N231TA	Denoyer Mark A CHALLENGER II	Individual owner Arizona	Experimental	2017-10-12	Valid
N620WC	Anderson Jason W CHALLENGER 2	Individual owner Wisconsin	Experimental	2017-10-05	Valid
N18VE	M-Squared Aircraft BREESE 2	Sky Knights Flight Club Thousand Oaks, California	Experimental	2017-09-28	Valid
N512D	Courtney David M CHALLENGER II CWS	Individual owner Montana	Experimental	2017-09-27	Valid
N9957H	Hilton David L AVID AIRCRAFT MODL B	Individual owner North Carolina	Experimental	2017-08-24	Valid
N25686	Tackabury Susan M CHALLENGER II	Individual owner Illinois	Experimental	2017-08-04	Valid
N826BP	James A Powell F SII	Individual owner Ohio	Experimental	2017-07-31	Valid
N8608Y	Mccallister Shawn CHALLENGER 1	Individual owner North Carolina	Experimental	2017-07-18	Valid
N50681	Rans S-17 STINGER	Individual owner South Carolina	Experimental	2017-06-29	Valid
N522PE	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Montana	Experimental	2017-06-16	Valid
N929YE	Kolb KOLB MARK II	Individual owner Alabama	Experimental	2017-06-13	Valid
N553FT	Schroeder Derek D CHALLENGER 1 CWS	Individual owner Nebraska	Experimental	2017-05-26	Valid
N31219	Britt George A FERGY F-11B	Individual owner Alabama	Experimental	2017-05-02	Valid
N103HK	Paulus Stephen J SINGLE SEAT CLASSIC	Individual owner Tennessee	Experimental	2017-04-18	Valid
N1509G	Reppert Merlyn R QUICKSILVER MXSPRINT	Individual owner Arizona	Experimental	2017-02-07	Valid
N465CH	Quad City Aircraft CHALLENGER II	Ch20396W1465 LLC Bruce Twp, Michigan	Experimental	2017-01-27	Valid
N2635F	Quicksilver GT-400	Individual owner Oregon	Experimental	2017-01-23	Valid
N2534C	Quicksilver MXL SPORT II	Individual owner Texas	Experimental	2016-12-30	Valid
N153DD	Dennis Lyle Dye KOLB FIRESTAR II	Individual owner Ohio	Experimental	2016-12-12	Valid
N967BC	Quad City CHALLENGER II	Individual owner New York	Experimental	2016-08-25	Valid
N3518T	Aman Gary A KOLB FS-2	Individual owner Arizona	Experimental	2016-08-15	Valid
N182EZ	Kolb FIRESTAR 11	Individual owner Massachusetts	Experimental	2016-08-11	Valid
N2543T	Reed James W CHALLENGER II	Individual owner Missouri	Experimental	2016-08-11	Valid
N372TF	Friesz Roger CHALLENGER II	Co-owned owner Washington	Experimental	2016-07-18	Valid
N9556Q	Thomas James R CGS HAWK	Individual owner Maryland	Experimental	2016-07-07	Valid
N574LT	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Mississippi	Experimental	2016-06-23	Valid
N1025Z	Lenaburg Allen G CHALLENGER I	Individual owner California	Experimental	2016-06-09	Valid
N503DB	Quad City Ultralights CHALLENGER II	Individual owner Florida	Experimental	2016-06-09	Valid
N303CW	Quad Cities Ultralights CHALLENGER II	Individual owner Illinois	Experimental	2016-03-19	Valid
N331RT	Tyler Robin A CHALLENGER II	Individual owner Alabama	Experimental	2016-01-22	Valid
N1864L	Brian Gafford DRIFTER MU582	Individual owner Ohio	Experimental	2015-11-06	Valid
N64326	Moriarity Duane A CHALLENGER II	Individual owner Wisconsin	Experimental	2015-10-01	Valid
N80538	Sorrell Aircraft Co Ltd SNS-9	Individual owner North Carolina	Experimental	2015-09-25	Valid
N876SR	Rager Steven W CHALLENGER II STAND	Individual owner Kentucky	Experimental	2015-09-03	Valid
N5050U	Challenger Corp CHALLENGER II	Individual owner Alabama	Experimental	2015-08-06	Valid
N65QC	Lewis Robert A CHALLENGER II	Individual owner Virginia	Experimental	2015-07-23	Valid
N953HP	Perkins Howard RANS S-14	Individual owner Oklahoma	Experimental	2015-05-22	Valid
N35135	Baldwin Greg L FLIGHTSTAR 1	Individual owner Oklahoma	Experimental	2015-05-21	Valid
N540ZM	Melin Carlyle A EINDECKER EIII	Co-owned owner Kansas	Experimental	2015-03-25	Valid
N134E	U-Fly-It Light Sport Acft Llc CHALLENGER II	Individual owner Arkansas	Experimental	2015-02-11	Valid
N6153	Lovel Richard L CHALLENGER 1	Individual owner Florida	Experimental	2014-12-04	Valid
N5664L	Quicksilver MX SPORT	Individual owner Wisconsin	Experimental	2014-11-18	Valid
N65083	Dishon P James EXCALIBUR	Individual owner Arkansas	Experimental	2014-10-31	Valid
N51431	New Kolb Co FIRE STAR II	Individual owner Colorado	Experimental	2014-10-22	Valid
N4433H	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Oregon	Experimental	2014-09-24	Valid
N56CR	Redden Clifton M SKYRAIDER	Individual owner Kentucky	Experimental	2014-08-04	Valid
N95352	Steffes Dale CHALLENGER II	Individual owner Pennsylvania	Experimental	2014-07-31	Valid
N1758C	Hill Merlin A CHALLENGER II	Individual owner Wisconsin	Experimental	2014-07-29	Valid
N28LN	Norem Lawrence R CHALLENGER II	Individual owner Wisconsin	Experimental	2014-06-30	Valid
N517YR	Michael Lee Robbins R-8	Individual owner Minnesota	Experimental	2014-06-19	Valid
N234FD	Highcraft Aero-Marine Inc BUCCANEER XA	Individual owner Florida	Experimental	2014-06-11	Valid
N61515	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Tennessee	Experimental	2014-05-05	Valid
N4877E	Brogdon George H HI-MAX 1700R	Individual owner California	Experimental	2014-04-10	Valid
N75390	Kolb FIRESTAR II	Individual owner Alabama	Experimental	2014-03-11	Valid
N1872C	Earthstar Aircraft Inc J24503	Individual owner California	Experimental	2014-03-10	Valid
N8029U	Crocker H L/Bura D CHALLENGER II	Individual owner New Jersey	Experimental	2014-03-07	Valid
N204PK	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Oklahoma	Experimental	2014-02-12	Valid
N125WD	Quad City Ultralight CHALLENGER II	Individual owner Florida	Experimental	2014-02-04	Valid
N312G	Dean James J FLIGHTSTAR I	Individual owner Mississippi	Experimental	2013-12-03	Valid
N3471	Thomas Robert CHALLENGER II	Thomas Robert Fort Atkinson, Wisconsin	Experimental	2013-11-25	Valid
N787SM	Mock D/Mock S HYPERHOPPER	Individual owner Oklahoma	Experimental	2013-11-01	Valid
N499EC	Russell David Collins CHALLENGER II	Individual owner Arkansas	Experimental	2013-10-29	Valid
N2812	Chicco Miguel E QUICKSILVER SPORT II	Sky Knights Flight Club Thousand Oaks, California	Experimental	2013-09-26	Valid
N2542A	Quad City Ultralight Acft Corp CHALLENGER II	Co-owned owner Florida	Experimental	2013-09-04	Valid
N740AB	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Alabama	Experimental	2013-08-05	Valid
N909DS	Daniel R Sepulveda RANS S-6ESTD COYOTE	Individual owner Puerto Rico	Experimental	2013-07-19	Valid
N3900A	Quicksilver MXII	Co-owned owner Kentucky	Experimental	2013-06-25	Valid
N396RB	Quad City Ultralight CHALLENGER 1 CW	Individual owner Michigan	Experimental	2013-06-18	Valid
N6116Z	Culver Steven L FERGUSON F2B	Individual owner Wisconsin	Experimental	2013-06-18	Valid
N35154	Titan TORNADO	Individual owner Iowa	Experimental	2013-05-10	Valid
N9092N	Quicksilver MXL II SPORT	Co-owned owner South Dakota	Experimental	2013-03-29	Valid
N56968	Quad City Ultralight Acft Corp CHALLENGER II	Individual owner Connecticut	Experimental	2013-01-16	Valid
N811EE	Flightstar SPYDER	Individual owner Oklahoma	Experimental	2013-01-15	Valid
N18XD	Casciola Dean E CHALLENGER II	Individual owner Massachusetts	Experimental	2012-12-21	Valid
N3746S	Quicksilver SPRINT II	Individual owner Wisconsin	Experimental	2012-09-24	Valid
N667TF	Anseeuw Brian J CHALLENGER II	Individual owner Iowa	Experimental	2012-09-21	Valid
N169A	New Kolb Aircraft Co FIRESTAR II	Individual owner New York	Experimental	2012-09-18	Valid
N2736A	Titan Aircraft Co TORNADO I	Individual owner Indiana	Experimental	2012-08-02	Valid
N7093W	Phantom Aeronautics Llc PHANTOM	Individual owner Michigan	Experimental	2012-07-27	Valid
N176CB	Quad City Ultralights CHALLENGER II	Individual owner Alabama	Experimental	2012-07-03	Valid