how do you get a ship to hover?

[inland turtle]

hi there, currently making a airship and trying to figure out how to hover in place using clockwork instead of eureka. I see people talking about using the optical lenses, computercraft, and/or the altitude meter but i cant seem to figure out how you use said items, thanks for any response!

[karmic barn]

You could use Create; Propulsion optical sensors

Then make them point downguards

Then put chain gearshifts between your propellers/lift source