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CAS: 7664-39-3 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N Synonym: hydrofluoric acid,hydrogen fluoride,fluorhydric acid,hydrofluoride,rubigine,fluorwasserstoff,hydrogen-fluoride,antisal 2b,fluorowodor polish,caswell no. 484 PubChem CID: 14917 ChEBI: CHEBI:29228 IUPAC Name: hydrogen fluoride SMILES: F

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Using bats to carry incendiary bombs into enemy territory wasn't a good idea, and it wasn't the first bad idea in the history of unmanned aerial vehicles (UAVs). During the American Civil War, an inventor patented an unmanned balloon that carried explosives that could be dropped after a time-delay fuse mechanism triggered the basket to overturn its contents. Air currents and weather patterns made it difficult to estimate for how long to set the fuse, and the balloon was never successfully deployed.

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CAS: 7664-39-3 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N IUPAC Name: hydrogen fluoride SMILES: F

CAS: 7732-18-5 Molecular Formula: HF Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N IUPAC Name: hydrogen fluoride SMILES: F

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CAS: 7732-18-5,7664-39-3 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N Synonym: hydrofluoric acid,hydrogen fluoride,fluorhydric acid,hydrofluoride,rubigine,fluorwasserstoff,hydrogen-fluoride,antisal 2b,fluorowodor polish,caswell no. 484 PubChem CID: 14917 ChEBI: CHEBI:29228 IUPAC Name: hydrogen fluoride SMILES: F

In the 1930s, the British Royal Navy developed a primitive, radio-controlled UAV: the Queen Bee. The Queen Bee could be landed for future reuse and could reach speeds of 100 mph (160 km/h). Instead of being used offensively though, the Queen Bee primarily served as aerial target practice for British pilots.

In the 1960s and 70s, the United States flew more than 34,000 surveillance flights using the AQM-34 Ryan Firebee, a UAV launched from a host plane and controlled by operators within that plane. The U.S. also employed UAVs called Lightning Bugs that were released from airborne C-130s for missions over China and Vietnam. Engineers from the manufacturer operated the aircraft with a joystick control.

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World War I saw the development and testing of various radio-controlled unmanned aircraft, but none emerged from the testing phase in time to be used before the war ended.

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During World War II, Nazis developed a UAV to be used against nonmilitary targets. The Revenge Weapon 1, an unmanned flying bomb better known as the V-1, could reach speeds of almost 500 mph (804 km/h), carry 2,000 pounds (907 kilograms) of explosives and could travel 150 miles (241 kilometers) before releasing its ordnance. Its wingspan was about 20 feet (6 m), and it measured nearly 25 feet (7.6 m) long. In towns and cities across Britain, the V-1 was responsible for more than 900 civilian deaths and 35,000 injured civilians [source: NOVA].

Hydrofluoric acid can dissolve glass, so it should be stored in polyethylene containers. Because it is extremely toxic and very dangerous, users must wear personal protective equipment. Unsafe exposure can cause local and systemic injuries and can be fatal.

CAS: 7664-39-3,7732-18-5 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N Synonym: hydrofluoric acid,hydrogen fluoride,fluorhydric acid,hydrofluoride,rubigine,fluorwasserstoff,hydrogen-fluoride,antisal 2b,fluorowodor polish,caswell no. 484 PubChem CID: 14917 ChEBI: CHEBI:29228 SMILES: F

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The U.S. acquired Pioneer UAVs from Israel and used them in the Gulf War. On at least one occasion, Iraqi soldiers attempted to surrender to one of the UAVs as it flew overhead [source: NOVA]

CAS: 7664-39-3 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N IUPAC Name: hydrogen fluoride SMILES: F

Hydrofluoric acid (HF, CAS 7664-39-3) is a corrosive, weak, inorganic, acidic, aqueous solution of hydrogen fluoride. HF is one of the strongest inorganic acids. It is colorless, odorless, highly corrosive, and available in a range of purity grades.

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In the late 1970s and 80s, Israel developed the Scout and the Pioneer, which represented a shift toward the lighter, glider-type model of UAV in use today. The Scout was notable for its ability to transmit live video with a 360-degree view of the terrain. The small size of these UAVs made them inexpensive to produce and difficult to shoot down.

By 1883, the first aerial photograph was taken using a kite, a camera and a very long string attached to the shutter-release of the camera. In 1898, this technology was put to use in the Spanish-American War, resulting in the first military aerial reconnaissance photos.

The Israelis obtained Ryan Firebees from the U.S. to use during the 1973 Yom Kippur War. The UAVs were used successfully to spur Egypt into firing its entire arsenal of anti-aircraft missiles at the Firebees. This mission was accomplished with no injuries to Israeli pilots, who soon swooped in over the depleted defenses.

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Although UAV technology saw sporadic development throughout the 20th century, it wasn't until the Predator drone arrived on the scene that unmanned aerial vehicles earned a permanent place in the arsenal. To understand the Reaper, it'll help us to know a little about its direct predecessor, the MQ-1 Predator. We'll read about this landmark UAV next.

CAS: 7664-39-3 Molecular Formula: FH Molecular Weight (g/mol): 20.01 MDL Number: MFCD00011346 InChI Key: KRHYYFGTRYWZRS-UHFFFAOYSA-N IUPAC Name: hydrogen fluoride SMILES: F

Hydrofluoric acid is used in the laboratory as an intermediate in many chemical reactions and syntheses. It serves as the fluorine source for creating many organofluorine compounds, like polytetrafluoroethylene and fluoropolymers, and for high-volume inorganic fluoride compounds such as sodium aluminum hexafluoride, cryolite, and aluminum fluoride.