# TCDS 5E-13: Franklin Engine Company

- Type: Type certificate data sheet
- Status: Current
- Holder: Franklin Engine Company
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/d1/39/d139f1d3742272db0031568519591db5bfd32403328afb07c46d022e1c13ee8f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D50EB9C0E76A3D658525676A0053C68F.0001
- Page: https://openairdocs.org/tcds/5E-13

## Models (1)

As the data sheet lists them.

- O-425-9

## What the data sheet says

From the PDF's text layer, line by line; tables lose their columns. The PDF is the record.

```text
FRANLIN ENGINE COMPANY
MODELS:  Aircooled Motors Franklin Military O-425-9
T.C. NUMBER:  5E-13
Model O-425-9
Type - 6HOA Geared 0.623: 1
Rating:
   Maximum continuous,
   hp, rpm, at S.L. press.
   alt. 240-3200-S.L.
   Take-off, hp, rpm,
   at full throttle 245-3300
Fuel (minimum grade
   aviation gasoline) 80/87
Bore and stroke, in. 4.75 x 4.00
Displacement, cu. in. 425
Compression ratio 7.4: 1
Weight (dry), lbs. 413
C.G. location
   From front face of
   thrust nut, in. 18.4
   Forward of rear face
   of crankcase, in. 10.5
   Below C.L. of
   crankshaft, in. 30.0
Propeller shaft,
   SAE No. 20
Ignition, dual Stromberg PS-78D carburetor
Timing, deg. BTC Scintilla S6LN-22 magnetos
Spark plugs 28
Oil sump capacity,
   quarts 13
NOTE 1.    Maximum permissible cylinder head, barrel, and oil inlet temperatures, 475 degrees
F.,
   325 degrees F. and 210 degrees F., respectively.  The cylinder head temperature is measured
   with a well type thermocouple.
NOTE 2.    Carburetor fuel pressure limits, 11 to 13 psi.
NOTE 3.    The following accessory provisions are provided:
Accessory Drive Directions* Drive Speed* Maximum Torque (in. lbs.)
Cont. Static
Starter C 1.000: 1 - - - - 6000
Generator C 2.368: 1 500 2200
Vacuum and hydraulic pump C 1.125: 1 100 800
Governor C 0.833: 1 125 2300
Fuel pump CC 0.750: 1 25 450
*”C” - Clockwise, “CC” - Counter clockwise
**Speed - Times crankshaft rpm
```

## ADs

None name its models.

## Registered aircraft by registry model (OpenAirDocs)

- [Franklin 0-425-9](https://openairdocs.org/engine/franklin-0-425-9): 0 aircraft (registry code 27012)

## STCs approved under this data sheet (1)

- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.