S2-33 "Clydesdale" Solid Fuel Booster

From Kerbal Space Program Wiki
Jump to: navigation, search
This article is a stub. You can help KSP Wiki by expanding it.
S2-33 "Clydesdale" Solid Fuel Booster
Part image
Solid rocket booster by

Radial size Large, Radial mounted
Cost (total) 18 500.00 Funds
(dry) 8 660.00 Funds
Mass (total) 144.00 t
(dry) 21.00 t
Drag 0.2-0.3
Max. Temp. 2200 K
Volume  ?
Impact Tolerance 10 m/s
Research Tech tree very heavy rocketry.png Very Heavy Rocketry
Unlock cost 54 000 Funds
Since version 1.8
Part configuration solidBoosterS2-33.cfg
Solid rocket booster
Maximum thrust (1 atm) 2 948.94 kN
(vacuum) 3 300.00 kN
Isp (1 atm) 210 s
(vacuum) 235 s
Fuel consumption 190.93 Units of fuel/s

Thrust vectoring 1 °
Fuel 16400.0 Units of fuel
Burn time (1 atm) 76.8 s
(vacuum) 85.9 s

The S2-33 "Clydesdale" Solid Fuel Booster (also known as an SRB) is a solid rocket booster used to provide a short burst of additional thrust to a rocket. It comes as a single unit. The engine and fuel tank are one single part which means that it isn't possible to increase the burn time for it by adding more fuel tanks.

It is one of the two 2.5m solid rocket boosters, larger than the S2-17 "Thoroughbred" Solid Fuel Booster.

Product description

The Clydesdale is not surprising just for its size. It's also amazing just how much thrust comes out of this motor - nothing else in its size class comes close.



Like other SRBs, the Clydesdale can be fired once, and cannot be shut down or throttled once active. While assembling a vessel, it is possible to adjust the amount of solid fuel and thrust using tweakables in the VAB or SPH. If planned properly, this can provide some control during flight. Unlike smaller SRBs, the Clydesdale has thrust vector control, making it easier to control while active.

Once ignited, a Clydesdale with full fuel and thrust will burn for 85.9 s. If jettisoned while empty, it can parachute to a safe landing with four Mk2-R Radial-Mount Parachutes.

The minimum thrust required for the Clydesdale to lift its own weight off Kerbin's surface at sea level is about 48%, or about 1412.6 kN.

The Clydesdale can be radially mounted like other SRBs to increase thrust and TWR during liftoff. Due to its large size and thrust, it can also be used as a standalone first stage, mounted below the rocket. However, because of its low specific impulse (Isp) and high mass, it is not recommended to use it beyond the first stage.



  • Initial Release