Sylvie Willis
SpaceX, a company founded in 2002 with the goal of revolutionizing space technology, manufactures and launches advanced rockets and spacecraft. One of its most notable creations is the Falcon Heavy, a powerful rocket capable of lifting nearly 64 metric tons (141,000 lbs) into orbit. With a total fueled mass of 1,420 tons (3,130,000 lbs), the Falcon Heavy generates an impressive 5 million pounds of thrust at liftoff, propelled by 27 Merlin engines. The rocket's first stage is crucial for landing and utilizes a significant amount of fuel, with estimates placing the total fuel burn at around 515.33 gallons of RP-1 and 2066.3 gallons of liquid oxygen per second.
| Characteristics | Values |
|---|---|
| Total fueled mass | 1,420 t (3,130,000 lb) |
| Thrust at liftoff | 5 million pounds |
| Number of cores | 3 |
| Number of engines | 27 |
| Engine type | Merlin 1D |
| Fuel | RP-1 and liquid oxygen |
| Fuel cost | $0.5 million |
| GTO payload when recovering all three booster cores | 8 t (18,000 lb) |
| GTO payload when recovering two outside cores and expending the center core | 16 t (35,000 lb) |
| First-stage fuel-mixture mileage | 0.0066 miles per gallon |
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What You'll Learn
Falcon Heavy's fuel RP-1 and liquid oxygen cost
The Falcon Heavy rocket, manufactured by SpaceX, uses RP-1 fuel and liquid oxygen as an oxidiser. The rocket's first stage incorporates 27 Merlin engines across three aluminium-lithium alloy rocket cores containing liquid oxygen and rocket-grade kerosene (RP-1) propellant.
The exact amount of fuel burned by Falcon Heavy is not publicly available, but estimates place the cost of fuel for a Falcon Heavy launch at around $0.5 million. This estimate is based on the assumption that the cost of fueling a Falcon 9 is around $200,000, and a Falcon Heavy would be 2.5 times that amount.
The cost of LOX is estimated to be around $0.20/kg, so using the $200,000 figure for Falcon 9, RP-1 fuel would be approximately $1.20/kg. Therefore, the cost of RP-1 fuel for a Falcon Heavy launch would be around $300,000.
Falcon Heavy generates more than 5 million pounds of thrust at liftoff, making it one of the most capable rockets flying. The rocket's first stage is equipped with 12 landing legs (4 on each booster) made of state-of-the-art carbon fibre with aluminium honeycomb. The interstage, a composite structure that connects the centre core on the first stage and second stages, holds the release and separation system. Falcon Heavy is also equipped with 12 hypersonic grid fins, positioned at the base of the interstage or nosecone, which orient the rocket during reentry.
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Total fueled mass of Falcon Heavy
The Falcon Heavy is a powerful rocket developed by SpaceX. It is composed of three reusable Falcon 9 nine-engine cores, with 27 Merlin engines that generate more than 5 million pounds of thrust at liftoff. This equates to approximately eighteen 747 aircraft at full power.
The total fueled mass of the Falcon Heavy is 1,420 tons or 3,130,000 pounds. This includes the rocket's payload, which can be up to 63.8 tons or 141,000 pounds in Low Earth Orbit (LEO). However, due to structural limitations, the maximum weight Falcon Heavy can lift is reduced.
The Falcon Heavy's first stage is powered by three Falcon 9-derived cores, each equipped with nine Merlin 1D engines. These cores contain liquid oxygen and rocket-grade kerosene (RP-1) propellant. The RP-1 fuel cost is estimated to be around $1.20/kg, while the cost of fueling a Falcon Heavy is estimated to be around $0.5 million.
The Falcon Heavy was designed with a propellant crossfeed capability, where the center core engines would be supplied with fuel and oxidizer from the two side cores until their separation. However, this approach was later abandoned in favor of throttling down the center core shortly after liftoff to conserve fuel.
The Falcon Heavy performed its first flight on February 6, 2018, carrying a Tesla Roadster automobile on a deep space trajectory. The rocket's payload performance is reduced by its reusable technology, but it still offers a much lower price compared to other rockets.
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Fuel used to land
The Falcon Heavy is composed of three reusable Falcon 9 nine-engine cores whose 27 Merlin engines together generate more than 5 million pounds of thrust at liftoff. The Falcon Heavy's first stage is equipped with 12 landing legs (4 on each booster) made of carbon fiber with an aluminium honeycomb structure. The four legs are stowed along the sides of each core during liftoff and extend outward and down just before landing.
The Falcon Heavy was originally designed with a "propellant crossfeed" capability, which allowed the centre core engines to be supplied with fuel and oxidizer from the two side cores until their separation. However, this approach was later changed, with the centre booster throttling down shortly after liftoff to conserve fuel and resuming full thrust after the side boosters separate.
The exact amount of fuel used to land the Falcon Heavy is not publicly available. However, it can be estimated to be around 63,933 kg of RP-1 and liquid oxygen (LOX) for a RTLS landing. With an ASDS landing, the fuel usage is significantly lower, as boostback consumes about two-thirds of the fuel.
The Falcon Heavy's Merlin engines use rocket-grade kerosene (RP-1) and liquid oxygen as rocket propellants. The Merlin engine was designed for recovery and reuse and features a larger exhaust section and expansion nozzle to maximize efficiency in the vacuum of space. Its combustion chamber is regeneratively cooled, while the expansion nozzle is radiatively cooled.
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Fuel mixture mileage
The Falcon Heavy rocket is composed of three reusable Falcon 9 nine-engine cores with 27 Merlin engines, generating more than 5 million pounds of thrust at liftoff. The engines are fuelled by liquid oxygen and rocket-grade kerosene, also known as RP-1. The total fuelled mass of the Falcon Heavy is 1,420 tonnes or 3,130,000 pounds.
The Falcon Heavy's first stage is powered by three Falcon 9-derived cores, each with nine Merlin 1D engines, which burn a mixture of RP-1 and liquid oxygen. The first stage uses fuel to land, and the total distance travelled must be considered when calculating mileage, just like how a car idling at a red light still counts towards its mileage.
The first stage of the Falcon 9 rocket uses 45,419 grams of liquid oxygen and 27,002 grams of RP-1, for a total fuel mixture of 72,421 grams. This results in a fuel-mixture mileage of 0.0066 miles per gallon, or 150.72 gallons per mile.
The second stage of the Falcon 9 rocket has 7,300 gallons of liquid oxygen and 4,600 gallons of RP-1, for a total fuel mixture of 11,900 gallons. The second stage burns approximately 1.04 gallons per second. The average speed of the rocket must be divided by the fuel consumption to determine the fuel-mixture mileage for the second stage.
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Fuel consumption of the second stage
The Falcon Heavy is composed of three reusable Falcon 9 nine-engine cores, with 27 Merlin engines that use rocket-grade kerosene (RP-1) and liquid oxygen as rocket propellants. The Falcon Heavy's first stage incorporates 27 Merlin engines across three aluminium-lithium alloy rocket cores containing liquid oxygen and rocket-grade kerosene (RP-1) propellant. The second stage is powered by a single Merlin 1D engine modified for vacuum operation, with a thrust of 934 kN (210,000 lbf) and a nominal burn time of 397 seconds.
The second stage has 7,300 gallons of LOX and 4,600 gallons of RP-1, for a total of 11,900 gallons of fuel mixture. The second stage burns approximately 1.04041535 gallons per second. To determine the total fuel consumption of the second stage, we must consider the distance travelled and the average speed.
The second stage ignites at 2 minutes and 48 seconds after launch, at a velocity of 7,777 km/s or 4,832 mph, and ends the burn at 9 minutes and 6 seconds after launch, at a velocity of 27,144 km/s or 16,866 mph. This results in a total distance travelled of 10,263 miles for the second stage.
By dividing the total distance by the fuel consumption rate, we can estimate the total fuel consumption of the second stage. However, it's important to note that fuel consumption may vary due to various factors such as speed, altitude, and engine performance.
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Frequently asked questions
The Falcon Heavy uses RP-1 rocket-grade kerosene and liquid oxygen as rocket propellants. The total fueled mass is 1,420 t or 3,130,000 lb. The cost of fueling is estimated to be around $0.5 million.
The Falcon Heavy has a total sea-level thrust of 22.82 MN or 5,130,000 lbf at liftoff, from its 27 Merlin 1D engines.
The first stage of the Falcon Heavy uses 45,419g of LOX and 27,002g of RP-1.
The second stage burns 515.33 gallons of RP-1 and 2,581.63 gallons of LOX per second.
