Propeller slip and efficiency — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/propeller-slip-efficiency/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- Geometric pitch is how far a prop should advance per revolution with no slip; effective pitch is how far it actually advances. Slip is the difference (FAA Powerplant Handbook).
- Efficiency, thrust horsepower over brake horsepower, ranges from 50% to 87% depending on slip (FAA). APC publishes performance data from vortex-theory simulations by rpm and airspeed for comparing props (Model Aviation, APC Q&A).
- 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.

parameter  value or range  source
Slip  geometric pitch - effective pitch  FAA Powerplant Handbook
Efficiency range  50-87%  FAA Powerplant Handbook
APC data basis  vortex theory, by rpm and airspeed  Model Aviation (APC)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- FAA: Aviation Maintenance Technician Handbook - Powerplant, Ch. 7 Propellers — web — Publisher's page; dimensions are facts — https://www.faa.gov/sites/faa.gov/files/09_amtp_ch7.pdf
- Model Aviation (AMA), J. Smith with APC Propellers: Common Questions with APC Propellers (Mar 2021) — web — Publisher's page; dimensions are facts — https://www.modelaviation.com/node/2115

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/propeller-slip-efficiency/index.json
API: https://xemstudio.com/api/geometry?object=propeller-slip-efficiency