# AircraftPower S > Aircraft engine performance calculator for Continental and Lycoming models. (iPhone/iPad app by James Petty.) - Source: https://appshunter.io/ios/app/aircraftpower-s/id1671252596 (this page in markdown: same URL + `.md`) - Developer: [James Petty](https://appshunter.io/developer/603661046) - Category: Utilities - Price: Free - Rating: 5.00/5 from 5 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 13.5 · 2 MB - Languages: American English - Released: 2023-03-03 - Data updated: 2026-06-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/aircraftpower-s/id1671252596/reviews.md ## What is AircraftPower S? AircraftPower S is the iPhone version of my iPad app, AircraftPower. It is is an Aircraft Engine Performance App which uses a standard reciprocating engine performance model to calculate and display the sea level and altitude performance of 74 normally-aspirated Continental® engine models and 107 normally-aspirated Lycoming® engine models. A graphic display shows the engine performance chart and illustrates the manual construction method for determining altitude performance that we learned in ground school (and promptly forgot). As the user changes the input values for manifold pressure (or % rated power), rpm, pressure altitude (or indicated altitude & altimeter setting) and and outside air temperature, the power output and percent power (or manifold pressure required) are displayed, and dotted lines and colored dots in the graphic display follow the manual construction method. While the graphics aren't really necessary, they are instructive (and interesting) to watch. The user may choose english or metric units for altitude, temperature, manifold pressure, altimeter setting and power output (however, the graphic always uses english units), and may select default values for the inputs and the engine. The user can also choose to input the indicated altitude instead of the pressure altitude (the default), and choose to input the % rated power instead of the manifold pressure. ## Key features - Calculates performance for 74 Continental and 107 Lycoming engine models - Graphic display of engine performance charts - Illustrates manual altitude performance construction methods - Adjustable input values for manifold pressure, RPM, altitude, and temperature - Choice of English or metric units - Selectable default input values and engine models ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/aircraftpower-s/id1671252596/reviews.md ### 5/5 — A&P IA *2025-11-19, version 2.4* Very useful for getting correct engine power settings for a wide range of conditions for proper engine break-in. Also for setting up and checking the horsepower constant for engine monitors. ### 5/5 — Excellent app *2024-12-31, version 2.1* This app (and its companion app for iPad, called AircraftPower) are fantastic tools that every Lycoming and Continental operator should have in flight. The ability to enter your altitude, barometer setting, and outside air temperature, and then set RPM and manifold pressure for an exact power setting, is invaluable! ### 5/5 — Outstanding *2024-11-25, version 2.1* The app is easy to use in the air, unlike the factory charts, as well as on the ground for planning. I have used it extensively. Fuel consumption would be a nice feature. ### 5/5 — Exactly what i want/need *2024-06-29, version 2.0* This is excellent. Accurate, useful, well-done. Thank you. ### 5/5 — This is exactly what I wanted *2024-01-01* Thank you. A perfect app. Well done. ### 5/5 — Excellent tool for in the cockpit *2023-06-09, version 1.1* I always like the iPad version of this app but glad there is now a iPhone version so I can use it when my iPad is running my moving map app or I choose to just fly with my iPhone on short flights. This app allows me to safely know when to lean the mixture using the actual tables from lycoming. No guessing or appropriating what percent power my engine is running at. ## Frequently asked questions about AircraftPower S ### What aircraft engine models does AircraftPower S support? AircraftPower S supports 74 normally-aspirated Continental® engine models and 107 normally-aspirated Lycoming® engine models. This comprehensive coverage allows for detailed performance calculations across a wide range of aircraft. ### Does AircraftPower S offer a free trial? AircraftPower S is completely free to download and use. There is no cost associated with accessing its features, and no trial period is necessary. ### Can I use AircraftPower S offline? The app's core functionality for calculating engine performance does not require an internet connection. You can use AircraftPower S to perform calculations even when you are offline. ### What units of measurement does AircraftPower S support? You can choose between English and metric units for altitude, temperature, manifold pressure, altimeter setting, and power output. The graphic display, however, consistently uses English units. ### How often is AircraftPower S updated? The latest version of AircraftPower S, version 2.4, was last updated on September 16, 2025. Updates typically address performance improvements and potential bug fixes. ### What devices is AircraftPower S compatible with? AircraftPower S is available for iPhone and iPod devices. It is designed to run on these Apple mobile platforms. ### Does AircraftPower S have ads? No, AircraftPower S does not contain advertisements. The app is ad-free, providing an uninterrupted user experience. ### What is the age rating for AircraftPower S? AircraftPower S has an age rating of 4+. This indicates that the content is generally suitable for all ages, with no mature themes or potentially objectionable material. ## Version history (last 5 releases) ### 2.4 — 2025-09-16 In response to requests from users, I've added the Lycoming O-540-F and IO-580-B1A engines. I've also made a small change — if one exits the engine selector using the "Cancel" button, the selector will be reset to the current engine. ### 2.3 — 2025-02-26 I fixed a problem with saving the % power setting, and did more code cleanup. ### 2.2 — 2025-01-10 At the suggestion of several users, I've added the Lycoming IO-360-M1B engine. I've also added support for the new iPhones, made a few minor aesthetic changes in the layout, and did some general code cleanup. ### 2.1 — 2024-07-06 I've added 11 engines in the Continental IO-550 family. Acting on user suggestions, I've added the ability to separately select your preferred units for manifold pressure and altimeter setting. I also fixed a minor bug which could affect the equivalent sea level standard manifold pressure output, updated the app for the latest iPad models and did some code cleanup. ### 2.0 — 2023-11-03 I've added an option to input % rated power and output the manifold pressure required, instead of inputting manifold pressure and outputting the power. To accomodate this new option for all the included engine models, I've had to change the maximum allowable manifold pressure from 32"Hg (1084 mb) to 31"Hg (1050 mb). I also fixed a bug, which could cause the app to freeze under an unlikely set of circumstances. Finally, I've made some more minor aesthetic changes. ## Apps similar to AircraftPower S | App | Rating | Price | Category | | --- | --- | --- | --- | | [Crewchief GA](https://appshunter.io/ios/app/crewchief-ga/id1470882836) | 4.8 (16) | Free | Utilities | | [iFly Weight and Balance](https://appshunter.io/ios/app/ifly-weight-and-balance/id495597804) | 4.7 (568) | Free | Utilities | | [SkewTLogPro](https://appshunter.io/ios/app/skewtlogpro/id522720710) | 2.7 (97) | Free | Utilities | | [Bonanza Performance](https://appshunter.io/ios/app/bonanza-performance/id910038344) | 5.0 (53) | Free | Utilities | | [C182 Performance](https://appshunter.io/ios/app/c182-performance/id1483297921) | 4.2 (9) | Free | Utilities | | [PA28 Performance](https://appshunter.io/ios/app/pa28-performance/id1541462246) | 4.5 (17) | Free | Utilities | ## More apps by James Petty - [Falco W&B](https://appshunter.io/ios/app/falco-w-and-b/id603661043) - [AircraftPower](https://appshunter.io/ios/app/aircraftpower/id718023187) - [TruAirspeed](https://appshunter.io/ios/app/truairspeed/id855269892) All apps by James Petty: https://appshunter.io/developer/603661046 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*