We haven't had tankers based off good old civvie designs since we aquired (by accident not design) the leaf boats*. Tide and Wave boats are built to naval standards to operate as part of a naval task force and achieve naval tasking's.
Civvie MN engineers coming to the RFA take a walk around a tide boat and go WTF is happening here.
*The leaf boats where so popular in the RFA as they lacked the ability to do almost anything but RAS(L). Meaning they where not being constantly buggered about by the RN doing all their jobs for them. Couldn't even have a flight embarked to clutter up the place. Plus Oakleaf had a pool and a sauna.
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My mistake - i thought the tides whilst BMT designed - were similar to comercial vessels in that "class" with the differrence being fettling around to fit a heli pad and the on deck storage.
What i was envisaging was a (commercial) tanker with a helipad and provision for ras rigs