Library › Aircraft design › Propellers ·
Propeller naming suffixes (E, SF, MR, P, W, N, C)
What do the letters on APC propellers mean? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Also called: apc prop suffix, apc sf meaning, apc e prop meaning, pusher prop p, apc mr prop, propeller naming, apc prop codes, slow flyer prop, wide chord prop w
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 5 in table
Notes
- APC stamps diameter x pitch on the blade, followed by letters: E thin electric, F folding, MR multirotor, SF slow flyer, R reversible (all electric-only); W wide chord, N narrow, NN very narrow, P pusher/reverse rotation, C carbon (40% carbon / 60% nylon) (APC Nomenclature).
- No letters means a standard right-hand Sport prop for IC engines that can also be used on electric motors (APC).
- The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle.
Propeller naming suffixes size chart
| parameter | value or range | source |
|---|---|---|
| E / F / MR / SF / R | thin electric / folding / multirotor / slow flyer / reversible | APC Nomenclature |
| W / N / NN | wide / narrow / very narrow chord | APC Nomenclature |
| P | pusher (reverse rotation) | APC Nomenclature |
| C | 40% carbon / 60% nylon by weight | APC Nomenclature |
| No suffix | standard right-hand Sport prop | APC Nomenclature |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| APC Propellers | APC Propeller Nomenclature | web | Publisher's page; dimensions are facts |
| Model Aviation (AMA), J. Smith with APC Propellers | Common Questions with APC Propellers (Mar 2021) | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| apc-propeller-naming-propeller | 10×4.7 in propeller, 2 blades: each section set at the geometric pitch angle atan(P / 2πr); chord and section illustrative | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=apc-propeller-naming

Fits with
Questions
Is an E prop OK on a glow engine?
No; electric props should only be used with electric motors (Model Aviation, APC Q&A).





