The VentureStar has a typical launch vehicle internal structure using Composite Propellant Tanks (CPTs). Similar to the Space Shuttle design, the LO2 Tank is placed atop the LH2 Tank. In this case, the LO2 Tank is lobed and two (not one) LH2 Tanks are placed underneath and on either side forming the isosceles triangular shape (Image 1).
The rocket engines are placed underneath the two LH2 Tanks, forming the base of the triangle.
Image 1: VentureStar Interior View
The rocket engines are placed underneath the two LH2 Tanks, forming the base of the triangle.
The Cargo Hold is situated between the two LH2 Tanks.
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The VentureStar looks very similar to the US Space Shuttle, with a white surface on the top and a dark metallic Thermal Protection System (TPS) heat shield on the bottom (see Image 2 and Image 3).