Difference between revisions of "BACC "Thumper" Solid Fuel Booster"

From Kerbal Space Program Wiki
Jump to: navigation, search
(Changed wording from RT-B20 to BACC to reflect the wording in the game. Adjusted thrust to current in-game values. Tested rocket for fuel consumption and burn time. Other miscellaneous small changes.)
m (creating link chain w/ other 1.25m SRBs)
(26 intermediate revisions by 11 users not shown)
Line 1: Line 1:
{{Partbox
+
{{:BACC "Thumper" Solid Fuel Booster/Box}}
|Name=RT-20 Solid Fuel Booster
+
The '''BACC "Thumper" Solid Fuel Booster''' is a large [[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 increase the burn time for it by adding more fuel tanks.
|Role=Booster
 
|Class=SolidRocket
 
|File=RT-B20 Solid Fuel Booster.png
 
|Costs=800
 
|Mass=6.75
 
|Drag=0.7
 
|Temp=3900
 
|Tolerance=7
 
|More=
 
{{PB-more|Dry Mass|1.75 t}}
 
{{PB-more|Thrust|300 kN}}
 
{{PB-more|Amount of fuel|850 L}}
 
{{PB-more|Isp (1 atm)|230 s}}
 
{{PB-more|Isp (vacuum)|250 s}}
 
{{PB-more|Fuel cons (1 atm)|17.706 L/s}}
 
{{PB-more|Fuel cons (vacuum)|16.246 L/s}}
 
{{PB-more|Burn time (1 atm)|48 s}}
 
{{PB-more|Burn time (vacuum)|52 s}}
 
|since=v0.18.2
 
|cfg=Parts/solidBooster1-1/part.cfg
 
}}
 
  
The '''Rockomax BACC Solid Fuel Booster''' (also known as an SRB) is a rocket engine used to provide thrust to a rocket.
+
The Thumper is larger than the [[RT-10 "Hammer" Solid Fuel Booster]], and smaller than the [[S1 SRB-KD25k "Kickback" Solid Fuel Booster]].
 +
 
 +
== Product description ==
 +
{{Quote
 +
|Filled with a new, even more volatile fuel, the BACC offers semi-reliable performance at a good price.
 +
|manufacturer=RMC}}
  
 
== Usage ==
 
== Usage ==
BACC's are one-shot rocket boosters often used to help get the massive bulk of a large multi-[[stage]] rocket off the ground. They burn at a constant thrust until they run out of fuel and then cease to work. It is usually a good idea to jettison spent fuel boosters as they are quite heavy even when empty. Solid boosters have a better thrust-to-weight ratio than a [[Liquid Fuel]] rocket and tank, but lack a controllable throttle or the ability to extend the duration of the burn and are not as efficient or powerful.
+
Thumpers are one-shot rocket boosters often used to help get the massive bulk of a large multi-[[stage]] rocket off the ground. They burn at a constant thrust until they run out of fuel and then cease to work. It should be noted that more boosters doesn't reduce the need for liquid fuel, as one must also take into account thrust-to-weight ratios. Thrust can be regulated with [[tweakable]]s.
  
The boosters can be mounted with the [[TT-38K Radial Decoupler|Radial Decouplers]] but cannot be stacked like their [[Liquid Fuel]] counterparts. It should be noted that more boosters doesn't reduce the need for [[Liquid Fuel]], as one must also take into account thrust to weight ratios.
+
The minimum thrust required for the Thumper to lift its own weight off Kerbin's surface is about 30%, or about 75 kN.  
  
BACC Solid Fuel Boosters are prone to overheating, especially when large numbers are clustered together. The main ways to overcome this are by using custom staging to stagger the firing, and attaching additional parts that are not SRBs (typically struts and/or winglets) to act as heat sinks.
+
Its thrust-to-mass ratio is high enough to make it a popular choice on first stages. Early in the game, it is possible to make an effective first stage out of just the Thumper.
  
As of 0.18.2, the BACC has a specific impulse (or Isp) of 230 s, slightly better than that of the [[RT-10 Solid Fuel Booster]] and comparable to the least efficient liquid fuel engines. Its thrust and mass are good enough to make it a popular choice on first stages.
+
== Trivia ==
 +
* In {{Version|0.25}}, the BACC has an on-pad specific impulse (or I<sub>sp</sub>) of 230, slightly better than that of the [[RT-10 Solid Fuel Booster]] and comparable to the least efficient [[liquid fuel engine]]s.  
 +
* Since {{Version|1.10}}, the Thumper is the only 1.25m solid rocket booster without texture variants.
  
== Description ==
 
{{Quote
 
|Filled with a new, even more volatile fuel, the BACC offers semi-reliable performance at a good price.
 
|Rockomax Conglomerate}}
 
  
Created by: NovaSilisko
+
== Changes ==
 +
;[[0.19]]
 +
* Thrust increased from 300 to 315. Dry mass reduced from 1.75 to 1.5.
  
== Changes ==
+
;[[0.18]]
;{{Version|0.18|}}
 
 
* Thrust decreased from 550 to 300.
 
* Thrust decreased from 550 to 300.
 
* Other small performance tweaks.
 
* Other small performance tweaks.
  
;{{Version|0.17|}}
+
;[[0.17]]
 
* Thrust increased from 400 to 550.
 
* Thrust increased from 400 to 550.
  
;{{Version|0.16|}}
+
;[[0.16]]
 
* Initial Release
 
* Initial Release
  
 
{{Parts}}
 
{{Parts}}
 +
[[Category:Solid rocket boosters]]

Revision as of 19:14, 24 July 2021

BACC "Thumper" Solid Fuel Booster
Part image
Solid rocket booster by
Rockomax Conglomerate

Radial size Small, Radial mounted
Cost (total) 850.00 Funds
(dry) 358.00 Funds
Mass (total) 7.65 t
(dry) 1.50 t
Drag 0.2-0.3
Max. Temp. 2200 K
Volume  ?
Impact Tolerance 7 m/s
Research General rocketry.png General Rocketry
Unlock cost 2 800 Funds
Since version 0.16
Part configuration solidBoosterBACC.cfg
Solid rocket booster
Maximum thrust (1 atm) 250.00 kN
(vacuum) 300.00 kN
Isp (1 atm) 175 s
(vacuum) 210 s
Fuel consumption 19.42 Units of fuel/s


Thrust vectoring No
Fuel 820.0 Units of fuel
Burn time (1 atm) 35.2 s
(vacuum) 42.2 s
Testing Environments
On the surface No
In the ocean No
On the launchpad Yes
In the atmosphere Yes
Sub orbital Yes
In an orbit Yes
On an escape No
Docked No
Test by staging Yes
Manually testable Yes

The BACC "Thumper" Solid Fuel Booster is a large 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 increase the burn time for it by adding more fuel tanks.

The Thumper is larger than the RT-10 "Hammer" Solid Fuel Booster, and smaller than the S1 SRB-KD25k "Kickback" Solid Fuel Booster.

Product description

Filled with a new, even more volatile fuel, the BACC offers semi-reliable performance at a good price.

Rockomax Conglomerate

Usage

Thumpers are one-shot rocket boosters often used to help get the massive bulk of a large multi-stage rocket off the ground. They burn at a constant thrust until they run out of fuel and then cease to work. It should be noted that more boosters doesn't reduce the need for liquid fuel, as one must also take into account thrust-to-weight ratios. Thrust can be regulated with tweakables.

The minimum thrust required for the Thumper to lift its own weight off Kerbin's surface is about 30%, or about 75 kN.

Its thrust-to-mass ratio is high enough to make it a popular choice on first stages. Early in the game, it is possible to make an effective first stage out of just the Thumper.

Trivia


Changes

0.19
  • Thrust increased from 300 to 315. Dry mass reduced from 1.75 to 1.5.
0.18
  • Thrust decreased from 550 to 300.
  • Other small performance tweaks.
0.17
  • Thrust increased from 400 to 550.
0.16
  • Initial Release