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.

I fixed a problem with saving the % power setting, and did more code cleanup.

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.

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.

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.

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.