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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Union City in Obion County, Tennessee — The American South (East South Central)
 

LR91-AJ -3 Engine

 
 
LR91-AJ -3 Engine Marker image. Click for full size.
By Sandra Hughes, July 18, 2017
1. LR91-AJ -3 Engine Marker
Inscription. Since the Titan I was a multi-stage Intercontinental Ballistic Missile (ICBM), the vehicle was made up of parts (stages)that separated from the rest of the body once its engines ran out of fuel. This decrease in weight during the flight gave Titan I the ability to have a longer target range and carrier a heavier payload (warhead).

The first stage was powered by two Aerojet Lr87-AJ-3 rocket engines at liftoff that delivered 300,000 pounds of thrust and burned for 134 seconds. When the first stage disconnected, a single Aerojet LR91-AJ-3 rocket engine ignited to power the second stage. Displayed here,, this engine produced 80,000 pounds of thrust and burned for 156 seconds to boost the missile. After the second stage fell away, two small vernier engines made final corrections to it trajectory before burning out. The re-entry vehicle caring the warhead reached an altitude of 541 miles above the Earth's surface (its apogee) before falling to its target.

The engines were fueled by liquid oxygen (LOX) and kerosene (RP-I), but these propellants were dangerous and difficult to handle. LOX had to be kept refrigerated at an extremely low temperature (-195* C) until a Titan I was ordered to launch. Since both the LOX and RP-I could not be pumped aboard the missile until right before launch, the reaction time from the launch command

LR91-AJ -3 Engine Marker image. Click for full size.
By Sandra Hughes, July 18, 2017
2. LR91-AJ -3 Engine Marker
to actual liftoff took twenty minutes.
 
Location. 36° 26.198′ N, 89° 4.244′ W. Marker is in Union City, Tennessee, in Obion County. Marker is on Graham Drive. Touch for map. Marker is located in Space Exploration Discovery Park America. Marker is at or near this postal address: 210-260 Graham Dr, Union City TN 38261, United States of America.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. UH-1B Iroquois (a few steps from this marker); Crawler - Transporter (within shouting distance of this marker); YP-84A Thunderjet (within shouting distance of this marker); Stem Landing (within shouting distance of this marker); Titan 1 Launch Complex (within shouting distance of this marker); Engineering the Dome (within shouting distance of this marker); Geodesic Dome (within shouting distance of this marker); F11F-1 Tiger (within shouting distance of this marker). Touch for a list and map of all markers in Union City.
 
Categories. Air & SpaceExplorationMan-Made Features
 
 
Credits. This page was last revised on July 26, 2017. This page originally submitted on July 24, 2017, by Sandra Hughes of Killen, Usa. This page has been viewed 41 times since then. Photos:   1, 2. submitted on July 24, 2017, by Sandra Hughes of Killen, Usa. • Bill Pfingsten was the editor who published this page.
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