Not just the vehicle. The mechanism that powers it. Wind is all well and good, but if we had a ship that was self-propelled, we'd never run the risk of being becalmed, we'd have a tactical advantage even with the wind against us...

[ His eyes glitter with aspiration, raw and excited. Of course he's thinking a thousand steps ahead. If they had it back home, that means they would've worked out how to get home, and they're still very much trapped here. He inhales, sharp. ]

All in time. Let's figure out how to move it first.