Editing Armadillo Aerospace (section)

====Quad vehicle====
{{Main|Quad (rocket)}}
The quad vehicle design is [[Pressure-fed engine (rocket)|pressure-fed]] in blow down mode from an initial pressure of 320 psi for level 1 (400 psi level 2). The roll thrusters are cross-fed by gas drawn from ullage space of the opposite tank. The vehicle is able to transfer propellant through connecting pipes between opposite tanks by controlling ullage pressures with the thrusters; this helps it balance, minimizing gas use. The main engine has two-axis [[thrust vectoring]]. The vehicle is fully computer controlled; with guidance from GPS and fiber optic gyroscopes.{{Citation needed|date=September 2009}}