bucket rigging

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becz
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Re: Bucket Rigging

Post by becz » April 17th, 2006, 10:03 am

PaulS wrote:Finally, if the two ports are the stronger boat movers in a 4, it doesn't make sense to put them together in the middle pair of seats, as that would put the startboard side at more of a disadvantage than regular "port stroked" rigging. The other way around, pair of starboards in the middle, wouldn't help them either if the ports are genuinely the stronger boat movers. IOW, if the ports are pulling the startboards around, either the ports can ease up, the starboards can "man up", or there is going to be rudder involved, to keep a straight course.
I'm not sure that's completely true. I sketched out a force diagram to picture what's going on, and it looks (at least on paper) like bucket rigging can help balance out an otherwise unbalanced crew. During the stroke there will be a useful component of force, but also a component perpendicular to the direction of travel (which of course is the component that causes the turning). The boat will rotate about the center of pressure (which will be near the center of the boat), and the further away from this location the force is applied, the greater the torque. So if you put the stronger rowers closer to the CP, the less they will cause the boat to turn, and the better the weaker rowers will be able to compensate.

I'm more familiar with the terms "German rigged" and "Italian rigged".

When to Italian rig a boat

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PaulS
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Re: Bucket Rigging

Post by PaulS » April 17th, 2006, 10:59 am

becz wrote:
PaulS wrote:Finally, if the two ports are the stronger boat movers in a 4, it doesn't make sense to put them together in the middle pair of seats, as that would put the startboard side at more of a disadvantage than regular "port stroked" rigging. The other way around, pair of starboards in the middle, wouldn't help them either if the ports are genuinely the stronger boat movers. IOW, if the ports are pulling the startboards around, either the ports can ease up, the starboards can "man up", or there is going to be rudder involved, to keep a straight course.
I'm not sure that's completely true. I sketched out a force diagram to picture what's going on, and it looks (at least on paper) like bucket rigging can help balance out an otherwise unbalanced crew. During the stroke there will be a useful component of force, but also a component perpendicular to the direction of travel (which of course is the component that causes the turning). The boat will rotate about the center of pressure (which will be near the center of the boat), and the further away from this location the force is applied, the greater the torque. So if you put the stronger rowers closer to the CP, the less they will cause the boat to turn, and the better the weaker rowers will be able to compensate.

I'm more familiar with the terms "German rigged" and "Italian rigged".

When to Italian rig a boat
I agree with what you are saying, however it also involves distance to the stern (second lever arm involved), i.e. the stroke will have the most difficult time "pulling the boat around" and the Bow will have the easiest (one of the reasons that the 2- requires two different force profiles to go straight, if the rowers are of equal strength. This also allows a slightly weaker bow to still be fine for steering concerns.)

Bow=1, Stroke=4
Standard 4: Starboard has slight advantage in turning to port.
Ports in 2, 3: Bow is equal, but stroke has lost some advantage to port.
Ports in 1, 4: Stroke is equal, but now bow has advantage to starboard.
Erg on,
Paul Smith
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polaco
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Post by polaco » April 17th, 2006, 11:53 am

Sometimes the reason is that you don't have a boat at your club and you have to row with a boat borrowed from another club and it's already rigged this way :lol: as it happened to us during the last Spanish Champs'.

Image


BTW at Spain we say ' a la italiana' (italian rigged)
52y 1.89m 98g

0.5K 1:25.1, 1K 3:15.7, 2K 6:27.9, 5K 17:22.6, 6K 20:53.6, 10K 36:55.9, 30' 8085m, 60' 15698, HM 1:20:47.2, FM 2:51:17
Lo que no nos mata nos hace más fuertes

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ancho
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Post by ancho » April 18th, 2006, 10:28 am

polaco wrote:Sometimes the reason is that you don't have a boat at your club and you have to row with a boat borrowed from another club and it's already rigged this way :lol: as it happened to us during the last Spanish Champs'.

Image


BTW at Spain we say ' a la italiana' (italian rigged)
Nice picture!
Who may be that powerfull rower with the flawless technique on the bow? :D
yr 1966, 1,87 m, 8? kg
[img]http://www.c2ctc.com/sigs/img1201739576.png[/img]
Be Water, My Friend!

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