AircraftPower S2.4 - App Store

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(R) engine models and 107 normally-aspirated Lycoming(R) 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.

Version History 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. 2.4 09/16/2025 I fixed a problem with saving the % power setting, and did more code cleanup. 2.3 02/26/2025 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. 2.2 01/10/2025 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. 2.1 07/06/2024 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. 2.0 11/03/2023 I've added two more Continental engines in the O-240 family.
I've fixed a bug which could cause the app to crash when switching between Lycoming and Continental engines, and two other bugs which delayed the main screen from immediately responding to changes made in User Preferences.
I've also smoothed out a few of the rough edges. 1.1 05/30/2023 1.0 03/03/2023