# AircraftPower > Aircraft engine performance calculator with graphical display and unit options. (iPhone/iPad app by James Petty.) - Source: https://appshunter.io/ios/app/aircraftpower/id718023187 (this page in markdown: same URL + `.md`) - Developer: [James Petty](https://appshunter.io/developer/603661046) - Category: Utilities - Price: Free - Rating: 4.94/5 from 17 App Store ratings · 12 written reviews indexed - Age rating: 4+ - Requires: iOS 13.5 · 2 MB - Languages: English - Released: 2013-10-24 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/aircraftpower/id718023187/reviews.md ## What is AircraftPower? AircraftPower is an Aircraft Engine Performance App. It uses a standard reciprocating engine performance model to calculate and display the sea level and altitude performance of 74 normally-aspirated Continental® engines and 108 normally-aspirated Lycoming® engines. 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, using the sliders or the custom keypad, for manifold pressure (or % power), rpm, pressure altitude 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, altimeter setting, temperature, manifold pressure 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. If using the indicated altitude, an input window for the altimeter setting appears. ## Key features - Reciprocating engine performance model - Calculates sea level and altitude performance - Graphical engine performance chart - Manual construction method illustration - Input manifold pressure, RPM, altitude, temperature - English and metric unit options ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/aircraftpower/id718023187/reviews.md ### 5/5 — Fantastic *2024-09-05, version 4.2* Great work James. Thanks for the IO550 additions! ### 5/5 — C177RG *2023-06-12* Have used this app for 3 mths. Has been shown to match very closely the manufacturers performance chart expectations. Engine is always more reliably in its comfort zone by using the app than without. Would recommend it to at least try it. C177RG flyer. ### 5/5 — Awesome *2023-01-22, version 3.0* This is perfect, great job excellent UI. I’d pay for it. ### 5/5 — Works Great *2022-11-21, version 2.3* I use it on most flights out of the traffic pattern. If he included IAS, I would also get TAS without need of the second app. ### 5/5 — About time! *2022-08-03, version 2.3* Great app, it’s about time we had something like available for those of us with older EMS systems. One question: Add a custom feature for engines that develop more power as a result of porting, and/or non-standard pistons? Thank you! ### 5/5 — Great app! *2022-03-30, version 2.2* A fellow RV’er friend of mine showed me this app, which I’ve now downloaded. It’s well done and super helpful! ### 5/5 — Excellent piece application *2020-07-16* Absolutely wonderful way of reviewing the power settings and understand what is actually happening. Saves so much work having to look at the physical tables - Especially for home builds where no formal POH’s exist.. ### 5/5 — Awesome: must to have!!!! *2019-09-02, version 2.1* I can't believe no one did that app before!! It's amazing, you thought about everything even the current altitude vs std press altitude: bravo! Just missing one thing: no indication when above max continuous power (dotted line in the manual following MAP). Thanks for the aviation community! ### 4/5 — Thanks for the Cool APP *2019-06-16, version 2.0* Very Neat APP. I did not see where the engines were being operated versus peak EGT? I assume you were using 100 degrees ROP as best power setting? ### 5/5 — Thank you *2019-06-08, version 2.0* Figuring out the Lycoming charts that you can’t read and understand in the owners manual on determining horsepower based upon manifold pressure, RPM, non-standard temperature and pressure altitude. I was pulling my hair out and I said to myself we need an app for this and you created it! Thank you so much. Very well designed. ## Frequently asked questions about AircraftPower ### What aircraft engines does AircraftPower support? AircraftPower supports 74 normally-aspirated Continental® engines and 108 normally-aspirated Lycoming® engines. It uses a standard reciprocating engine performance model for calculations. ### Can I use AircraftPower offline? The provided data does not specify offline capabilities. However, as a performance calculation tool, it is likely designed to function without an internet connection once installed. ### What units can I use with AircraftPower? You can choose between English and metric units for altitude, altimeter setting, temperature, manifold pressure, and power output. The graphic display, however, always uses English units. ### How does AircraftPower display engine performance? It features a graphic display that illustrates the engine performance chart and shows the manual construction method for determining altitude performance. This display updates dynamically as input values are changed. ### Does AircraftPower have ads? No, AircraftPower does not contain advertisements. The app is free and does not have in-app purchases, indicating a completely ad-free experience. ### What devices is AircraftPower compatible with? AircraftPower is currently supported on iPads. The app is rated for ages 4 and up. ### How often is AircraftPower updated? The latest version, 4.5, was last updated on September 17, 2025. This indicates a recent update, suggesting ongoing support and development. ### What is the user sentiment for AircraftPower? AircraftPower has a high rating of 4.9 stars from 17 ratings, suggesting overwhelmingly positive user sentiment. Users likely appreciate its functionality and accuracy. ## Version history (last 5 releases) ### 4.5 — 2025-09-17 In response to requests from two users, I've added the Lycoming O-540-F and IO-580-B1A engines. While doing this, I discovered and fixed a minor bug with the Info screen's "Make It So" button. I also made a small change — if one exits the engine selector using the "Cancel" button, the selector will be reset to the current engine. ### 4.4 — 2025-02-24 I fixed a problem with saving the % power setting, and did more code cleanup. ### 4.3 — 2025-01-11 Following user requests, I've added the Lycoming IO-360-M1B engine. I've also added support for the new iPads, made a few minor aesthetic changes in the layout, did a whole mess of recoding, and did some general code cleanup. ### 4.2 — 2024-07-04 I've added 11 engines in the Continental IO-550 family. I've also 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, and did more coding cleanup. ### 4.1 — 2023-11-15 I've corrected a reported problem with the information screens on the iPad Pro 10.5" ## Apps similar to AircraftPower | App | Rating | Price | Category | | --- | --- | --- | --- | | [Coflyt](https://appshunter.io/ios/app/coflyt/id1479355740) | 4.1 (50) | Free | Utilities | | [PA28 Performance](https://appshunter.io/ios/app/pa28-performance/id1541462246) | 4.5 (17) | Free | Utilities | | [C182 Performance](https://appshunter.io/ios/app/c182-performance/id1483297921) | 4.2 (9) | Free | Utilities | | [Bonanza Performance](https://appshunter.io/ios/app/bonanza-performance/id910038344) | 5.0 (53) | Free | Utilities | | [SkewTLogPro](https://appshunter.io/ios/app/skewtlogpro/id522720710) | 2.7 (97) | Free | Utilities | | [ACE-Editor](https://appshunter.io/ios/app/ace-editor/id6469464234) | 5.0 (5) | Free | Utilities | ## More apps by James Petty - [Falco W&B](https://appshunter.io/ios/app/falco-w-and-b/id603661043) - [TruAirspeed](https://appshunter.io/ios/app/truairspeed/id855269892) - [AircraftPower S](https://appshunter.io/ios/app/aircraftpower-s/id1671252596) 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 2026-06-01.*