Engines · piston (reciprocating) · data as of October 23, 2026

Franklin O-335

1 aircraft on the U.S. register carry a Franklin O-335 engine, rated at about 150 horsepower. The Hiller UH-12 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 Franklin O-335. FAA spelling: O-335.

Fitted to model families

Hiller UH-121

Model families, as a table

	aircraft
Hiller UH-12	1

Hiller UH-12

Where they are owner's state

Georgia1

By state, as a table

	aircraft
Georgia	1

Kind of aircraft

Helicopters1 (100%)

By kind, as a table

	aircraft	share
Helicopters	1	100%

When the aircraft were built by decade

By decade built, as a table

	aircraft
1950	1

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

Fitted to

Hiller UH-12 1 with this engine series

Where they are

Georgia 1 of these aircraft

Biggest operators

Plane Fun INC Tr Trustee 1 of these aircraft

Analytics

The whole map of how records connect · these connections as data: /graph/engine/franklin-o-335.json.

Aircraft newest certificates first · 1

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N26US	Hiller UH-12C	Rotorcraft	Plane Fun INC Tr Trustee Snellville, Georgia	Standard	2020-10-21	Valid

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 23, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.