Discussion
Conditions affecting ignition and combustion.
| Condition | Pressure | Reaction rate | Ignition difficulty |
|---|---|---|---|
| Sea level take-off | High | Fast | Easy |
| Sea level start | Low | Moderate | Moderate |
| Altitude cruise | Moderate | Moderate | Moderate |
| Altitude relight | Very low | Slow | Hardest |
What governs the difficulty in the last row?
Answer: D
Reaction rates fall steeply with pressure, so a spark that lights the chamber easily on the ground may fail entirely at altitude. The relight envelope is published as a band of altitude and airspeed for exactly this reason.
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