trol module with a crew of two. This vehicle has payload capabilities of 151 tons up and 55 tons down. The separate weights are the followings I.2.5.5 The COTV ( Cargo Orbit Transfer Vehicle ) Fig.254: CARGO ORBITAL TRANSFER VEHICLE (COTV) OPTIONS [Source: 78/551 Two options have been selected, one for each reference SPS. The one uses silicon cells without concentration as the reference SPS does. It has a payload capability of 4000 tons, weights 1206 tons and requires a round-trip time of 160 days. The total mass in LEO is 6191 tons. The ion bombardement thrusters are identical with those used at the AOCS of the SPS. The other option uses GaAlAs solar cells with a CR of two. It has a payload capability of 3469 tons, weights 715 to, and requires a round-trip time of approx. 180 days. The total mass in LEO is 4396 tons.
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