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Solid rocket booster

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A Solid rocket booster, abbr. SRB, sometimes simply called solid booster, is a rocket engine powered by solid fuel. SRBs incorporate engine and fuel in a single part. Once ignited, they cannot be shut down or throttled and will burn at maximum thrust until their entire internal fuel supply is spent. Since solid fuel cannot be transferred between parts, a burnt-out solid booster cannot be reignited. Using tweakables you can decrease the amount of solid fuel in the booster or limit the amount of thrust at launch and thus decrease the burn time or twr.

Compared to other rocket engines, solid rocket boosters offer a high thrust-to-weight ratio, but low specific impulse (fuel efficiency). Therefore they are typically used in the first stage of a rocket when the thrust is needed to get an initially heavy rocket off the ground. Boosters are usually mounted on radial decouplers so they can be jettisoned as soon as they burn out.

Available parts

The following table provides an overview of all SRBs in KSP.

Solid Fuel Density is 7.5 kg/unit Mass
(t)
Fuel
(units of fuel)
Thrust
(kN)
TWR Isp (s) Burn
(s)
Full Empty
Image Part Radial size Cost
(Fund)
Full Empty Max. Temp.
(K)
Tolerance
(m/s)
Tolerance
(g)
atm vac atm vac atm vac atm vac
RT-5.png
RT-5 "Flea" Solid Fuel Booster Small 200
(116)
1.50 0.45 2 000 7 50 140 162.91 192.0 11.07 13.05 36.90 43.49 140 165 8.9
RT-10.png
RT-10 "Hammer" Solid Fuel Booster Small 400
(175)
3.56 0.75 2 000 7 50 375 197.90 227.0 5.67 6.50 26.90 30.85 170 195 23.7
BACC SFB.png
BACC "Thumper" Solid Fuel Booster Small 850
(358)
7.65 1.5 2 200 7 50 820 250.0 300.0 3.33 4.00 16.99 20.39 175 210 42.3
SRB.png
S1 SRB-KD25k "Kickback" Solid Fuel Booster Small 2 700
(1 140)
24.00 4.5 2 200 7 50 2 600 593.86 670.0 2.52 2.85 13.45 15.18 195 220 62.9
Sepratron.png
Sepratron I Radial mounted 75
(70)
0.0725 0.0125 2 000 7 50 8 13.792 18.0 19.39 25.31 112.47 146.79 118 154 5.03
Launch Escape System.png
Launch Escape System[Note 1] Small 1 000
(982)
1.1 0.9 2 700 15 50 30 666.667 750.0 60.41 75.51 67.96 84.95 160 180 0.53
  1. The Launch Escape System is located in category "Utility" in the game.


See also