# TCDS ATC 101 Wright: Wright Aeronautical Division Curtiss-Wright Corporation

- Type: Type certificate data sheet
- Status: Current
- Holder: Wright Aeronautical Division Curtiss-Wright Corporation
- Revision: 0
- Product: Engine
- Data sheet PDF: https://openairdocs.org/files/sha256/a4/c3/a4c38431345c0a87585f7df76d610fdb9b3a35a021bfcab1908d3851a6c79a4d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CC0CA69AE4FCDBA862572C0006F7F3B.0001
- Page: https://openairdocs.org/tcds/ATC%20101%20Wright

## Models (2)

As the data sheet lists them.

- Cyclone SGR-1820F-31
- Cyclone SR-1820F-31

## What the data sheet says

This is OCR from the scanned FAA data sheet. OCR can misread letters and numbers.

```text
MOLEIS: Wright Cyclone SR-1820F-31 and SGR-1820F-31
I-C. NUMBER: AIC 101
Model - Cyclone  SR-18 20F-31  SGR-1820F-31
Type - 98A  Direct drive  8:5 or 16:11 reduction gearing
Rating:
Maximum continuous,
bç•  rpm.  at S.L.
pressure altitude  645-1900-32 112-5.L.  645-1950-32 1/2-5.1.
At rated pressure
altitude  (It.)  670-1900-32 172-2500  670-1950-32 1/2-2500
Take-off  (one minute),
645-1900-32 1/2  645-1950-32 172
Fuel  (minimum octane
aviation gasoline)  80
Eore and stroke, in.  6.125 × 6.875
risplacement, cu. in.  1823
Compression ratio  6.4:1
Weight (dry), lbs.  900  980
Fropeller shaft,  SAE NO.  40 spline  40 spline (8:5): 50 spline (16:11)
supercharging
(impeller gear ratio)  5.95:1
Carburetion  Stromberg NAU-86 carburetor with
2-1/2 in.  venturi
Ignition, dual  Scintilla VAG-9IF magnetos
Certification basis  Approved Type Certificate No. 101
NOIE 1.  Apfroval expired 4/7/37. No engines of these models manufactured after that date eligible for use ir
certificated aircraft.
NOTE 2.  Engine serial number 21027, converted to R-1820F-31 from R-1820F-3 model, eligible with the following
rating:
Maximum continuous, hp.  rpm, in Hg.. at:
S.I. fressure altitude  858-1850-32 172-100
Rated  Fressure altitude  (ft.)
Take-off  (one minute), hp. Ipm, in. Hg.
```

## ADs

None name its models.

## STCs approved under this data sheet (1)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

## PMA parts (OpenAirDocs) (1)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this data sheet's models, so check the FAA record before relying on it. Newest first.

- [72-231114-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID165594803620260722204356.0001): TAG-Engine. Swift Fuels, LLC · PMA PQ04423CE · Modification part · For Cyclone SGR-1820F-31, Cyclone SR-1820F-31 · Jul 17, 2026

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