What you need
- A glow or gas aircraft in the hangar
- A helper or a stand that holds the model securely
- Hearing protection
Steps
- Open Bench and tap Engine tuning. Or open a glow or gas aircraft and tap Engine tuning under Bench.
- Set the engine's strokes, cylinders and prop blades once. Maiden needs them to turn the sound into RPM.
- Put the iPhone on the ground behind the prop, never beside or in front of it, and tap Start listening.
- Under Peak, lean the high-speed needle slowly until the RPM stops rising. Maiden holds the peak.
- Richen the needle until the drop from peak reaches the target. Then try Pinch and Nose-up.
- Type the needle turns and tap Save session. Turn on Runs well to start from these settings next time.
Good to know
- Readings need a clear engine sound. Wind, other engines or a iPhone too far away make them unreliable.
- The pinch test and nose-up check are hints. Your engine's manual has the final word.
- Hot days and high fields raise the density altitude, which makes an engine run richer.
If it doesn't work
- Microphone access is off
- Tap Open Settings and turn on Microphone for Maiden.
- The reading jumps around
- Move the iPhone closer to the engine and out of the wind. Check the strokes and cylinders too.