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ESA made in beginn 1990 several study for advance Ariane 5 rocket, what let to big Ariane super lourd concept 1991
also they study this interesting Idea
Ariane 5 with TWO Vulcain (HM60) engines with each 800 kN thrust and 220 tons fuel in EPC
The Idea behind the concept is this Problem:
after the solid booster are drop, the acceleration falls 1.18G from to 0.74 G!
This is because Vulcan 1 has thrust of only 1145 kN (vac) lower as rest mass of rocket.
that fault founds in the original design of Ariane 5 who had much lower Payload. but Hermes became heavy, so HM60 replace by Vulcain 1 and they accepted gravity drag temporary.
what let to the R&D on Vulcain 2 engine for Ariane 5 ECA
Back to Ariane 5 with 2x Vulcain (HM60) engines and 1600 kN thrust what reduce the gravity drag, also the wished thrust for R&D on future Vulcain 3
The source tell about EPC 210 stage, that's 50t more fuel as EPC155 would make the EPC210 - 38 meter high.
but this problematic for the EAP Solid Booster with 31 meter length to fit on ECP210
Source:
Flug Revue Nr 9 September 1993 page 56
Got some one more Info on this Ariane 5 version ?
also they study this interesting Idea
Ariane 5 with TWO Vulcain (HM60) engines with each 800 kN thrust and 220 tons fuel in EPC
The Idea behind the concept is this Problem:
after the solid booster are drop, the acceleration falls 1.18G from to 0.74 G!
This is because Vulcan 1 has thrust of only 1145 kN (vac) lower as rest mass of rocket.
that fault founds in the original design of Ariane 5 who had much lower Payload. but Hermes became heavy, so HM60 replace by Vulcain 1 and they accepted gravity drag temporary.
what let to the R&D on Vulcain 2 engine for Ariane 5 ECA
Back to Ariane 5 with 2x Vulcain (HM60) engines and 1600 kN thrust what reduce the gravity drag, also the wished thrust for R&D on future Vulcain 3
The source tell about EPC 210 stage, that's 50t more fuel as EPC155 would make the EPC210 - 38 meter high.
but this problematic for the EAP Solid Booster with 31 meter length to fit on ECP210
Source:
Flug Revue Nr 9 September 1993 page 56
Got some one more Info on this Ariane 5 version ?