About this app
Props & Governors offers an interactive and complete systems presentation on piston aircraft single-engine and multi-engine constant speed propellers and governors. The course is divided into illustrated and text descriptions of each system, accompanied by interactive training diagrams including a fully functioning Propeller/Governor system for both single and multi-engine aircraft. Topics covered include: Manifold Pressure and how it is affected Propeller governor components (Flyweights, Speeder Spring, Pilot Valve) Propeller components (Counterweights, Feather Spring, Feathering Pins)
Latest release
What’s New
This update from Apple will improve the functionality of this app. No new features are included. - Updated graphics for Multi-Engine Propeller Hub (Oil and Feathering Spring reversed). - Minor corrections to text throughout course
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 15, 2026 · 4:35 PM $5.99
Screenshots
