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Thrust vectoring
nope. *pull* does NOT affect the rudder, only *push* does.
careful. you *must* be moving through the water for a rudder to be effective when trying to back up. Not quite true. When 'trying to back up' (attempting rearward motion) you will often use bursts of ahead over the rudder to alter the pointing of a boat, whether you're static or actually moving astern. Very large diameter props, well sheltered from prop walk, with a large rudder close to the prop (as on single prop tugs and some fishing vessels), will, in astern, cause rudder to alter the direction from which water is ingested into the prop. If the water is ingested from one direction, and exits in another, that deflection causes a change in lateral momentum - creating a force which in turn causes a yaw. Of course, single screw tugs are not so common now, and this thread was about twin screw vessels. But this used to be a useful manoeuvring trick. Note that the effect is in the same direction as the burst of ahead; ie, full left rudder yaws the vessel to the left in either fwd or reverse (no 'suction' effect). And note that I was talking about props sheltered from prop walk - either through their depth, the use of shields or a lateral offset. JimB |
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