In contrast, solid rockets often have TNT equivalencies similar in magnitude to the mass of the propellant grain.
2.
The solid propellant space booster plant ( SPROB ) processes large size propellant grains for the satellite launch vehicles.
3.
The burn rate of the propellant depends not only on the chemical make up, but also on the shape of the propellant grains.
4.
The Rodman seven perforation grain was named after Rodman, and similar propellant grain shapes are still in use today in artillery, rockets, and automotive airbag inflators.
5.
Unburned propellant grains may remain in the barrel if the energy-releasing " flame zone " cannot be sustained in the resultant absence of gaseous reactants from the inner zones.
6.
By the end of this seven seconds, the end of the delay train reaches the rocket's primary igniter and subsequently lights the motor's two propellant grains via an igniter pellet.
7.
Charles Bartley, employed at JPL ( Caltech ), substituted curable synthetic rubber for the gooey asphalt, creating a flexible but geometrically stable load-bearing propellant grain that bonded securely to the motor casing.
8.
These are commercially produced motors requiring the user to assemble propellant grains, o-rings and delay grains and ejection charges into special non-shattering aluminum motor casings with screw-on or snap-in ends ( closures ).
9.
In liquid and hybrid rockets, the propellant flow entering the chamber is controlled using valves, in solid rockets it is controlled by changing the area of propellant that is burning and this can be designed into the propellant grain ( and hence cannot be controlled in real-time ).
10.
Around 30 seconds into ascent, the SSMEs were throttled down usually to 72 %, though this varied to reduce the maximum aerodynamic forces acting on the Shuttle at a point called Max Q . Additionally, the propellant grain design of the SRBs caused their thrust to drop by about 30 % by 50 seconds into ascent.
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