Ariane 540C

Ariane 540C has two variants: the 541C and the 543C. Both uses the well-known Ariane 5 parts with dark purposes and few conscience. Actually, they are the brainchild of Ariane 5 and of Kerbal's most reknwown motto: "MOAR BOOSTERS". And while Ariane 541C is almost sane, 543C has absolutely lost it. See by yourself...

Ariane 540C Variant	Boosters	First Stage	Second Stage	Third Stage
541C	4x EAP	EPC	Enhanced ESC
543C	4x EAP	2x EPC	EPC	Enhanced ESC

Basic Build Guide - Ariane 541C

The 541C is actually quite an obvious concept: take the two Ariane 5 EAPs and make it four ! Then, upgrade your second stage with a dual nozzle engine, and here you go: a brand new 541C is now standing on the pad... or falling apart because you forgot to add struts, but that's none of my business.

Second Stage

• Payload Adapter K-250 "Kyida" / Dual Payload Adapter K-375 "Kylda"
• 3.75m Fairing
• Ariane "Behaviour" Small Fuel tank
• Probe Core "Cortex" Avionics System
  • 2x Mk-61 "Zorg" RCS Pod
• RE-L10 "Poodle" Liquid Fuel Engine

First Stage

• Decoupler G2500
• 3.75m Fairing
• Ariane 5 EPC
• Ariane 5 "Vulcain" Liquid Fuel Engine

Boosters

• 4x KEREB-H "Dr-Strange" Radial Decoupler
• 4x Ariane 5 "EAP" Solid Fuel Booster
  • EAP Nose Cone For Ariane 5
    • 8x Pushotron

Basic Build Guide - Ariane 543C

The 543C is arguably out of his mind, and is definitely not a reasonable concept. It can thus be described as the perfect launcher to put on Kerbin's launch pads ! This astonishing rocket takes an Ariane 5, and methodically removes every bit of decency and sanity to make room for two addition EPC, and 4 EAPs. It's entirely plausible that such a concept would be pitched with cross-feed fuel tanks, or on the contrary without decouplers. But here you have a guide to build a version that uses a lower thrust main core and two full power outer cores. It's unclear what would have been mounted inside this huge fairing, but it would definitely have been large, and heavy.

*Engineer note found on the back of the rocket: Good luck with that one. And don't forget to build a bunker prior to main engines ignition.

Third Stage

• Payload Adapter K-250 "Kyida" / Dual Payload Adapter K-375 "Kylda"
• 3.75m Fairing
• Ariane "Behaviour" Small Fuel tank
• Probe Core "Cortex" Avionics System
  • 2x Mk-61 "Zorg" RCS Pod
• HM7 "Zebulon" Liquid Fuel Engine

Second Stage

• Decoupler G2500
• 3.75m Fairing
• Ariane 5 EPC
• Ariane 5 "Vulcain" Liquid Fuel Engine

First Stage

Ariane 534C's First Stage basically consists of two Ariane 5 strapped on either sides of the second stage. It's unclear whether they would have been dropped in flight with a thrust-reduced main core, but it's KSP, so we added moar boosters.

• 2x KEREB-H "Dr-Strange" Radial Decoupler
• 2x Ariane 5 EPC
• 2x Ariane 5 "Vulcain" Liquid Fuel Engine

Boosters

Those are like secondary boosters. There is two of EAP strapped on each first stage side tanks. As I said: two Ariane 5s strapped on the main core ! How crazy is that...

• 2x KEREB-H "Dr-Strange" Radial Decoupler
• 2x Ariane 5 "EAP" Solid Fuel Booster
  • EAP Nose Cone For Ariane 5
    • 8x Pushotron