H1

H1, H-1, H01, H I and their variations may refer to:

Science

ATC code H01 Pituitary and hypothalamic hormones and analogues, a subgroup of the Anatomical Therapeutic Chemical Classification System statistical category of eyelid inflammations

Statistics

Transportation

Aviation

Motor vehicles

Roads

Ships and maritime

Interstate H-1

Interstate H-1 (abbreviated H-1) is the busiest Interstate Highway in the US state of Hawaii, located on the island of O‘ahu. Despite the number, this is an east–west highway—the 'H'-series (for Hawaii) numbering reflects the order in which routes were funded and built. H-1 goes from Route 93 (Farrington Highway) in Kapolei to Route 72 (Kalanianaole Highway) in Kāhala. East of Middle Street in Honolulu (exit 19A), H-1 is also known as the Lunalilo Freeway and is sometimes signed as such at older signs in central Honolulu. West of Middle Street, H-1 is also known as the Queen Liliʻuokalani Freeway; this name is shown on some roadmaps. It is both the southernmost and westernmost signed Interstate Highway in the United States.

Route description

Interstate H-1 begins near the Campbell Industrial Park in the town of Kapolei, Hawaii. West of this point, Hawaii state route 93 (Farrington Highway) continues toward Waianae. The freeway continues east, passing the community of Makakilo until reaching the junction with SR 750 (north to Kunia) and SR 76 (south to Ewa Beach).

Rocketdyne H-1

The Rocketdyne H-1 is a 205,000 lbf (910 kN) thrust liquid-propellant rocket engine burning LOX and RP-1. The H-1 was developed for use in the S-I and S-IB first stages of the Saturn I and Saturn IB rockets, respectively, where it was used in clusters of eight engines. After the Apollo program, surplus H-1 engines were rebranded and reworked as the Rocketdyne RS-27 engine with first usage on the Delta 2000 series in 1974.

History

Early engines

The H-1 is one of a series of engines developed from the wartime V-2 ballistic missile. During the war, North American Aviation (NAA) was given several 59,600 lbf (264.9 kN) V-2 engines to examine and convert from metric to SAE measurements. They formed their "Propulsion Division" to handle this work, later becoming Rocketdyne.

NAA had also been given a wealth of technical documentation on the engine, where they came across plans to improve the V-2 engine using a new fuel injector. The Germans were unable to get the design to work, however, and it never went into service. NAA engineers decided to attack this problem, and quickly came up with solutions. This allowed them to raise the thrust of the design to 75,000 lbf (330 kN), and then 78,000 lbf (350 kN) for the Redstone missile.