# TCDS ATC 98: 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/eb/e3/ebe39c68302a0b4aa971a6d1db8c230db0a2ac5130a93d5ad6db8139f9bf3341
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4A000705BBC87D578525670E00653F09.0001
- Page: https://openairdocs.org/tcds/ATC%2098

## Models (4)

As the data sheet lists them.

- Cyclone SGR-1820F-2
- Cyclone GR-1820F-2A
- Cyclone R-1820F-2A
- Cyclone SR-1820F-2

## What the data sheet says

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

```text
WRIGHT AERONATICAL DIVISION
CURTISS-WRIGHT CORPORATION
MODELS:  Wright Cyclone SR and SGR-1820F-2, R and GR-1820F-2A
T.C.  NUMBER:  ATC 98
Model - Cyclone SR-1820F-2 SR-1820F-2 SR-1820F-2 R-1820F-2A
Type - 9RA Direct Drive Direct Drive Direct Drive Direct Drive
Rating:
  Maximum
  continuous, hp,
  rpm, in.Hg. at:
   Rated pressure
   altitude (ft.) 715-1950-34
  1/2-3000
735-1950-34
  1/2-4000
770-1950-36
  1/2-2500
770-1950-2000
   S.L. pressure
   altitude 680-1950-34
  1/2-S.L.
695-1950-34
  1/2-S.L.
740-1950-36
  1/2-S.L.
755-1950-36-S.L.
  Take-off (one
  minute), hp, rpm,
  in.Hg. 715-1950-36 735-1950-36 770-1950-37 1/2 770-1950-36 1/2
   hp, rpm, at full
   throttle - - - - - - - - - - - - - - - -
Fuel (minimum
  octane aviation
  gasoline) 87 - - - - - - - - - - - -
Bore and stroke,
  in. 6.125 x 6.875 - - - - - - - - - - - -
Displacement, cu.
  in. 1823 - - - - - - - - - - - -
Compression ratio 6.4: 1 - - - - - - - - - - - -
Weight (dry), lbs. 940 - - - - - - - - - - - -
Propeller shaft,
  SAE No. 40 - - - - - - - - - - - -
Supercharging
  (Impeller gear
  ratio) 7: 1 - - - - - - - - - - - -
Carburetion Stromberg NA-
  U8H
Stromberg NA-
  F7C
- - - - - - - -
  venturi diameter,
  in. 2-1/2 2-1/4 - - - - - - - -
Ignition, dual Scintilla VAG-
  9DF-R5, SF9L or
  SF9LN magnetos
- - - - - - - - - - - -
NOTES 1a, 5, 6 1a, 4, 5, 6 1b, 5, 6 1b, 2, 5, 6
Certification basis Approved Type Certificate No. 98
MODELS:  Wright Cyclone SR and SGR-1820F-2, R and GR-1820F-2A (Continued)
T.C. NUMBER:  ATC 98 (Continued)
Model - Cyclone SGR-1820F-2 SGR-1820F-2 SGR-1820F-2 GR-1820F-2A
Type - 9RA 8: 5 8: 5 or 16: 11 16: 11 16: 11

reduction gearing reduction gearing reduction gearing reduction gearing
Rating:
  Maximum
  continuous, hp,
  rpm, in.Hg., at:
   Rated pressure
   altitude (ft.) 700-1950-34
  1/2-3000
720-1950-34
  1/2-4000
750-1950-36
  1/2-2500
750-1950-36-2600
   S.L. pressure
   altitude 660-1950-34
  1/2-S.L.
680-1950-34
  1/2-S.L.
725-1950-36
  1/2-S.L.
740-1950-36-S.L.
  Take-off (one
  minute), hp, rpm,
  in.Hg. 700-1950-36 750-1950-37 1/2 750-1950-37 1/2 750-1950-36 1/2
  hp, rpm, at full
  throttle - - - - - - - - 810-1950 810-1950
Fuel (minimum
  octane aviation
  gasoline) - - - - - - - - - - - - - - - -
Bore and stroke,
  in. - - - - - - - - - - - - - - - -
Displacement, cu.
  in. - - - - - - - - - - - - - - - -
Compression ratio - - - - - - - - - - - - - - - -
Weight (dry), lbs. 1035 - - - - - - - - - - - -
Propeller shaft,
  SAE No. - - - - 40 (8: 5), 50 (16:
  11)
50 - - - -
Supercharging
  (impeller gear
  ratio) - - - - - - - - - - - - - - - -
Carburetion Stromberg NA-
  U8H
Stromberg NA-
  F7C or NA-F7E
- - - - - - - -
  venturi diameter,
  in. 2-1/2 2-1/4 - - - - - - - -
Ignition, dual - - - - - - - - - - - - - - - -
NOTES 1c, 5, 6 1d, 5, 6 1e, 3, 5, 6 1e, 2, 3, 5, 6
Certification basis Approved Type Certificate No. 98
NOTE 1.    Serial numbers eligible:
(a)  Up to and including 22767
(b)   22768 and up
(c)  Up to and including 22736
(d)  Up to and including 22746, 22756, 22756, 22759, 22810, 22813, 22815 to 22820, 22833, 22834,
22838, to 22859, 22865, 22874 to 22876, 22961 to 22974, inclusive.
(e)  22747 and up except those listed in (d)
NOTE 2.    These engines equipped with F-50 type cylinders.
NOTE 3.    The full throttle rating is allowed only when 100 octane fuel or finned type spark plugs are
   used.
NOTE 4.    Engine serial number 21920 eligible with take-off rating of 770-1950-37 1/2-S.L.

NOTE 5.    80 Octane aviation gasoline may be used provided 550 hp is not exceeded.
NOTE 6.    Approval expired 7/12/37.  No engines of these models manufactured after this date or with
   serial numbers above 24176 (models SR-1820F-2 and R-1820F-2A) or 24407 (models SGR-1820F-2
and
   GR-1820F-2A) eligible for use in certificated aircraft.
```

## ADs (1, in force first)

- [AD 94-14-10](https://openairdocs.org/ad/94-14-10): Aviation Gasoline · Wright Aeronautical Division, Curtiss-Wright Cyclone R-1820F-2A, Cyclone R-1820F-3A, Cyclone R-1820F-56 and 6 more. Effective Feb 13, 1996

## STCs approved under this data sheet (3)

- [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
- [STC SA1626NM PAGE 2](https://openairdocs.org/stc/SA1626NM%20PAGE%202): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SE1083GL](https://openairdocs.org/stc/SE1083GL): Installation of Shadin fuel flow transducer.. Shadin Company Inc

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