The U.S. aircraft register, updated daily
Engines · piston (reciprocating) · data as of October 29, 2026

Willis-Mor OX-5

1 aircraft on the U.S. register carry a Willis-Mor OX-5 engine, rated at about 90 horsepower. The Curtiss JN-4 is the model most often fitted with it (1 aircraft).

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 Willis-Mor OX-5. FAA spelling: OX-5.

Fitted to model families

Curtiss JN-41
Model families, as a table
aircraft
Curtiss JN-41

Curtiss JN-4

Where they are owner's state

South Carolina1
By state, as a table
aircraft
South Carolina1

Kind of aircraft

Piston singles1 (100%)
By kind, as a table
aircraftshare
Piston singles1100%

When the aircraft were built by decade

0001112010
By decade built, as a table
aircraft
20101

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

Fitted to
Where they are
Analytics

The whole map of how records connect · these connections as data: /graph/engine/willis-mor-ox-5.json.

Aircraft newest certificates first · 1

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N3073 Curtiss
JN4D
 Fixed-wing, single engine Mantei and Associates
Lexington, South Carolina
 Experimental 2015-08-13 ValidFAA registration status code V: Valid registration. All codes

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 29, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.