14 cyl 109,000 HP engine submerged

[grantxr6t]

BIG motor.Love to see the start motor.Or is it air start?

Air start to each cylinder, either way. Cam shaft slides along and allows engine to run either way. Big ships have reversing engines, no transmissions. That's one reason they're slow to stop!

Yeah have played that game trying to get ships out of slipway in a tidal river system (Cairns).
When it does not work first time round & you need to return to fwd thrust it gets bloody hairy as the boat starts drifting towards the dock pylons whilst engine direction is changed.
Especially when said boat has just had an $3 million refit inc $1 million in paint, stress, what stress.

Even with reversing g/boxs some are prone to stall when direction is changed to fast...

I worked on fishing boat engines and in trucks at universal diesel,Darwin.Before and after the cyclone.Only gardeners & Perkins,man diesel and stuff.