ullage$86120$ - definizione. Che cos'è ullage$86120$
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Cosa (chi) è ullage$86120$ - definizione

SMALL ROCKET MOTOR USED TO SETTLE LIQUID FUEL PRIOR TO IGNITION OF A LARGER ROCKET
Ullage engine; Ullage rocket
  • Ullage engine on Saturn V third stage
  • This [[Saturn IB]] second-stage Auxiliary Propulsion Unit is similar to one used on the [[Saturn V]] third stage, which performed as an ullage engine for [[translunar injection]].

ullage         
UNFILLED SPACE IN A CONTAINER, PARTICULARLY ONE HOLDING A LIQUID
Ullage (rocketry)
['?l?d?]
¦ noun
1. the amount by which a container falls short of being full.
2. loss of liquid by evaporation or leakage.
Origin
ME: from Anglo-Norman Fr. ulliage, from OFr. euillier 'fill up', based on L. oculus 'eye' (with ref. to a container's bunghole).
Ullage         
UNFILLED SPACE IN A CONTAINER, PARTICULARLY ONE HOLDING A LIQUID
Ullage (rocketry)
·noun The amount which a vessel, as a cask, of liquor lacks of being full; wantage; deficiency.
Ullage motor         
Ullage motors (also known as ullage engines or ullage rockets) are relatively small, independently fueled rocket engines that may be fired prior to main engine ignition, when the vehicle is in a zero-g situation. The resulting acceleration causes liquid in the rocket's main tanks to settle towards the aft end, ensuring uninterrupted flow to the fuel and oxidizer pumps.

Wikipedia

Ullage motor

Ullage motors (also known as ullage engines or ullage rockets) are relatively small, independently fueled rocket engines that may be fired prior to main engine ignition, when the vehicle is in a zero-g situation. The resulting acceleration causes liquid in the rocket's main tanks to settle towards the aft end, ensuring uninterrupted flow to the fuel and oxidizer pumps.