A Boeing 707 jet airliner at the moment of take-off is largely powered by steam. Three times as much water is sprayed into the engines’ burner cans as kerosene (156,000 lbs water per hour compared with 45,000 lbs kerosene), a technique whereby the super-heated steam provides take-off power and the water keeps the temperature from rising above 1,600⁰F.
From the book "Fighter" by Len Deighton