# TCDS P-826: Curtiss-Wright Corporation

- Type: Type certificate data sheet
- Status: Current
- Holder: Curtiss-Wright Corporation
- Revision: 3
- Revised: May 1, 1970
- Product: Propeller
- Data sheet PDF: https://openairdocs.org/files/sha256/10/3d/103d8892cb0a86f15e482dcd71304727d7e32e734f763d8ab10feb415ed1b60f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7F02ADDE7E62A7848525670F005B0A00.0001
- Page: https://openairdocs.org/tcds/P-826

## Models (1)

As the data sheet lists them.

- C644S

## What the data sheet says

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

```text
Page No. 1 2
Rev. No. 3 3
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
P-826
Revision 3
CURTISS
C644S
May 1, 1970
TYPE CERTIFICATE DATA SHEET NO. P-826
Propellers of models described herein conforming with this data sheet (which is part of type certificate no. 826) and other
approved data on file with the Federal Aviation Administration meet the minimum standards for use in certificated aircraft in
accordance with pertinent aircraft data sheets and applicable portions of the Civil Air Regulations/Federal Aviation Regulations
provided they are installed, operated, and maintained as prescribed by the approved manufacturer's manuals and other approved
instructions.
Type Certificate Holder Curtiss-Wright Corporation
Curtiss Division
Caldwell, New Jersey  07006
Type Electrically controllable - feathering and reversing (see NOTES 3 and 4)
Engine shaft SAE No. 60 spline
Hub material Steel
Blade material Hollow steel
Number of blades 4
Hubs eligible C644S-B  (see NOTE 1)
Blade Eligible
Maximum
Continuous Takeoff
Diameter
Limits
Hub and
Blade Weight
(See Note 2) HP RPM HP RPM (See Note 2) (Max Diameter)
830-20C4-0 2650 1085 3500 1160 15' 2" (-  0) 819 lbs.
1052-20C4-30 2800 960 3500 1020 16' 8" (-30) 864 lbs.
Certification basis Type Certificate No. 826, issued September 24, 1945, reissued January 2, 1962.
Production basis Production Certificate No. 8
NOTE 1. Hub Model Designation
The model designation of a complete Curtiss propeller assembly (which includes all rotating parts
except the spinner) consists of a letter and a number suffixed to the basic model designation.  For example:
Basic Model Designation
Suffix
Special assembly number which includes all rotating
parts (except the spinner) and designates pitch settings
General design series
"S" for steel blades
Blade shank size (No. 4 special)
Number of blades
SAE No. 60 spline shaft
Curtiss (manufacturer)
306BC 6 4 4 S -
A change in the suffix letter indicates a design series change which may affect eligibility.  Only those
design series listed are eligible.  A change in the suffix number indicates a minor change which does not
affect propeller eligibility.

P-826 Page 2
NOTE 2. Blade Model Designation
For hollow steel blades the model designation consists of a series of numbers and letters suffixed to
the basic model number.  For example:
Basic model number
Reduction in inches from basic design diameter
(as -30, diameter reduced 30")
1052
Suffix
30C4
Curtiss blade shank size
Interchangeability index. Number 1 appears as the
basic design. Numbers 2, 3, etc., indicate a
change affecting interchangeability.
20
Blades of the same model with different suffixes are equally eligible as listed in NOTE 6, but only blades
with a like suffix should be assembled in the same hub.
NOTE 3. Pitch Control.  Eligible only with Curtiss manual control, constant speed governor, or automatic
synchronizer.
NOTE 4. (1) Feathering.   Eligible with full feathering control and voltage booster installed in accordance
with the propeller manufacturer's instructions.
(2) Reversing.  Eligible with reversing control and voltage booster installed in accordance with the
propeller manufacturer's instructions.
NOTE 5. Left-Hand Models.  The left-hand version of an approved model propeller is eligible at the same rating
and diameter limitations as listed for the right-hand model.
NOTE 6. Interchangeable Blades.  Only blades listed in the same group of the following listed groups are
sufficiently similar aerodynamically and vibrationwise to permit interchangeability in the same diameter
without a flight test.  Blades with different model numbers, however, should not be incorporated in the
same propeller, and reference should always be made to the ratings of the blades.  None.
NOTE 7. Accessories.
(1) Propeller deicing.  Eligible with only Curtiss fluid or electrical deicing provisions.
(2) Spinners.  Eligible with only Curtiss spinner.
NOTE 8. Shank Fairings.  Curtiss steel blades are considered eligible for installation of blade shank cuffs.
Specific part numbers and weights of eligible cuffs will be shown in the pertinent Aircraft
Specification/Type Certificate Data Sheets.
NOTE 9. Special Limits.  Not applicable.
NOTE 10. Special Notes.  The word "eligible" as used herein does not signify approval.  For approval,
compliance with the applicable aircraft airworthiness requirements is necessary.
....END....
```

## ADs

None name its models.

## STCs approved under this data sheet (1)

- [STC SP00582NY](https://openairdocs.org/stc/SP00582NY): Installation of Prop-Guard Polyurethane Protective Tape on the leading edge of metal propellers.. McFarlane Aviation, Inc.

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