Propeller blade count (2, 3 and 4 blades) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/propeller-blade-count/  (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
- Adding blades lets a smaller-diameter prop absorb the same power. APC's rule: with the same blade shape and pitch, a 3-blade prop equals about 90% of a 2-blade's diameter and a 4-blade about 84% (Model Aviation, APC Q&A).
- This is useful for ground or scale clearance. The FAA notes large power increases drove four- and six-blade propellers on full-size aircraft (FAA Powerplant Handbook).
- 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
3-blade equivalent diameter  about 90% of 2-blade  Model Aviation (APC)
4-blade equivalent diameter  about 84% of 2-blade  Model Aviation (APC)
Worked example (derived)  12x6 2-blade -> ~10.8x6 3-blade -> ~10.1x6 4-blade  computed from APC rule
Reference build  10.8 x 6, 3 blades  computed

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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
- 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

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