Boing Kerbofortress VI
by XLjedi
uploaded 2018-12-21
(updated 2019-06-01)
stock ship
#Boeing #Superfortress #bomber #B-29 #X-1

1.7.1 Craft File

• Removed invalid KIS part module references (1.7.1)
• Flight Tested and 1.7.1 Approved!

The DERP Program

In the years that preceded the official formation of the Kerbal Space Program, there were a number of lesser (but not less important!) achievements in aerospace engineering and design. Perhaps most famous, were those first bold missions of the DERP Program. The brave Kerbal Aerospace Pioneers who took part in the program were among the first to challenge the Kraken with their persistent, yet sometimes clumsy, DERP attempts.

Oh? What does DERP stand for? That does seem to be somewhat up for debate. Hysterical scholars mostly agree on the ERP part (Experimental Rocket Plane), but the D seems to be a bit of an enigma. Also seems to be dependent on who you ask. We’ll just go ahead and tell the DERP story and let you draw your own conclusions.

  • Type: SPH
  • Class: ship
  • Part Count: 114
  • Pure Stock


Realizing the Kerbofortress needed a little more boost, two additional Wheesley J-33’s were added. Another decade of useful service would pass before anyone realized all of the engines were installed backwards.

A stock aircraft called Boing Kerbofortress VI. Built with 114 of the finest parts, its root part is mk3Cockpit.Shuttle.

Built in the SPH in KSP version 1.7.1.

Chase plane photo of the Kerbofortress IV during its famous flight with the Dumbell X-1 Definitely Experimental Rocket Plane
- Kerbal Hysterical Archives

The ground crew moves in to assist the little DERP with loading. After initial test flights, the X-1 Hammer engine cowling was modified to improve airflow. RV-29 Pit Bull apron pushback pictured in foreground.
- Kerbal Hysterical Archives

Initial DERP attempts at launching from the Dessert Test Facility runway proved to be unsuccessful. There was not enough solid rocket fuel available for the sustained flight times needed to break the sound barrier. Keep in mind, the first iterations of the Hammer solid rocket fuel engine only had about 15% of its modern day thrust.

Shortly following the first test flight, Upchuck Kerman (famous test pilot) gave the DERP its more common nickname…
Doofy Experimental Rocket Plane although… others have also referred to it as Dangerous and Deadly
- Kerbal Hysterical Archives

Thanks for downloading! Go try it out… and if you like the design, your up-votes do make me happy and are a great way to encourage posting another design. ;-D

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