{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":91,"name":"Cessna 195","note":"","unit":"with this engine series","url":"https://eflight.com/models/cessna/195"},{"count":27,"name":"Cessna T-50","note":"","unit":"with this engine series","url":"https://eflight.com/models/cessna/t-50"},{"count":18,"name":"Waco YKS-7","note":"","unit":"with this engine series","url":"https://eflight.com/models/waco/yks-7"},{"count":13,"name":"Waco YKS-6","note":"","unit":"with this engine series","url":"https://eflight.com/models/waco/yks-6"},{"count":5,"name":"Beechcraft B17","note":"","unit":"with this engine series","url":"https://eflight.com/models/beechcraft/b17"},{"count":5,"name":"Waco YQC-6","note":"","unit":"with this engine series","url":"https://eflight.com/models/waco/yqc-6"},{"count":5,"name":"Beechcraft C17","note":"","unit":"with this engine series","url":"https://eflight.com/models/beechcraft/c17"},{"count":5,"name":"Beechcraft E17","note":"","unit":"with this engine series","url":"https://eflight.com/models/beechcraft/e17"}],"relation":"powers"},{"group":"Where they are","items":[{"count":22,"name":"Texas","note":"","unit":"of these aircraft","url":"https://eflight.com/states/TX"},{"count":19,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":16,"name":"Ohio","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OH"},{"count":14,"name":"Washington","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WA"},{"count":10,"name":"Illinois","note":"","unit":"of these aircraft","url":"https://eflight.com/states/IL"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":4,"name":"Beechcraft Heritage Museum INC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/beechcraft-heritage-museum-inc"},{"count":3,"name":"Port Townsend Aero Museum","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/port-townsend-aero-museum"},{"count":3,"name":"Mid Atlantic Air Museum","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/mid-atlantic-air-museum"},{"count":2,"name":"Western Antique Aeroplane & Automobile Museum","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/western-antique-aeroplane-automobile-museum"}],"relation":"owned by"},{"group":"Airworthiness","items":[{"count":16,"name":"Failure reports on the Jacobs L4 /R755-7","note":"","unit":"reports since 1995","url":"https://eflight.com/engines/jacobs-l4-r755-7#airworthiness"}],"relation":"subject to"},{"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":225,"horsepower":245,"id":"jacobs-l4-r755-7","maker":"Jacobs","name":"Jacobs L4 /R755-7","thrust_lb":null,"type":"Piston (reciprocating)","url":"https://eflight.com/engines/jacobs-l4-r755-7"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}