Which technique is associated with achieving fuel efficiency in level flight?

• A. Short blasts of heat at high frequency
• B. Long continuous burns at high power
• C. Constant low-power burn throughout
• D. No burner use during level flight

Answer: (A)

Fuel efficiency in level flight comes from heating the air only as needed, using short, frequent bursts of burner. By pulsing the burner, you continuously compensate for the air cooling that would otherwise cause the balloon to sink, but you do so with minimal total burn time. Long, continuous burns keep the air hot for a prolonged period, which wastes fuel. Keeping burner use on a constant low level still uses fuel continuously and doesn’t respond as effectively to small changes in altitude as quick bursts do. Not using the burner at all would let the balloon descend, making level flight unsustainable. The quick, high-frequency heat bursts provide the right balance of buoyancy and efficiency to maintain level flight with the least fuel expenditure.