{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":22,"name":"Quad City Ultralight Acft Corp CHALLENGER II","note":"","unit":"with this engine series","url":"https://eflight.com/models/quad-city-ultralight-acft-corp/challenger-ii"},{"count":11,"name":"Quicksilver GT-400","note":"","unit":"with this engine series","url":"https://eflight.com/models/quicksilver/gt-400"},{"count":7,"name":"Kolb FIRESTAR II","note":"","unit":"with this engine series","url":"https://eflight.com/models/kolb/firestar-ii"},{"count":7,"name":"Quad City Ultralights CHALLENGER II","note":"","unit":"with this engine series","url":"https://eflight.com/models/quad-city-ultralights/challenger-ii"},{"count":5,"name":"Airborne REDBACK","note":"","unit":"with this engine series","url":"https://eflight.com/models/airborne/redback"},{"count":5,"name":"Kolb Aircraft FIRESTAR II","note":"","unit":"with this engine series","url":"https://eflight.com/models/kolb-aircraft/firestar-ii"},{"count":4,"name":"Aerotrike SAFARI","note":"","unit":"with this engine series","url":"https://eflight.com/models/aerotrike/safari"},{"count":4,"name":"Kolb FIRESTAR","note":"","unit":"with this engine series","url":"https://eflight.com/models/kolb/firestar"}],"relation":"powers"},{"group":"Where they are","items":[{"count":36,"name":"Wisconsin","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WI"},{"count":35,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":34,"name":"Texas","note":"","unit":"of these aircraft","url":"https://eflight.com/states/TX"},{"count":31,"name":"Florida","note":"","unit":"of these aircraft","url":"https://eflight.com/states/FL"},{"count":25,"name":"Illinois","note":"","unit":"of these aircraft","url":"https://eflight.com/states/IL"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":2,"name":"Evolution Aircraft INC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/evolution-aircraft-inc"}],"relation":"owned by"},{"group":"Analytics","items":[{"count":null,"name":"The fleet by engine type","note":"","unit":"","url":"https://eflight.com/analytics/fleet"},{"count":null,"name":"Every engine series","note":"","unit":"","url":"https://eflight.com/engines"}],"relation":"compared in"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"aircraft":560,"horsepower":52,"id":"rotax-503-dcdi","maker":"Rotax","name":"Rotax 503 DCDI","thrust_lb":null,"type":"Two-cycle piston","url":"https://eflight.com/engines/rotax-503-dcdi"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}
