| Title: | SAILING |
| Notice: | Please read Note 2.* before participating in this conference |
| Moderator: | UNIFIX::BERENS |
| Created: | Wed Jul 01 1992 |
| Last Modified: | Mon Jun 02 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2299 |
| Total number of notes: | 20724 |
Noticing a few boats that just got hauled, I can't help but wonder
what the separately controllable tabs at the aft end of a rudder
do. Are these the trim controls that the inner wheel on a 12 meter
controls?
The rudder looks like this.
| | Post
+---+---------------+--+
| | | <--- There is a control arm which moves
| | | this around, coming out from near
| Main | | rudder post.
| Rudder | |
| | |
| | |
| | |
| | |
+-------------------+--+
Rick
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 685.1 | One explanation? | AYOU17::NAYLOR | Tue Nov 03 1987 05:33 | 4 | |
Wind-vane autohelming?
Brian
| |||||
| 685.2 | another explanation? | VLNVAX::FRENIERE | Tue Nov 03 1987 09:08 | 7 | |
I think Brian's right. The wind vane does not have the torque to
move the whole rudder so thru linkages it moves the vane enough
to use the pressure of the water moving by to drive the rudder.
I think thats the way it works....
Don
| |||||
| 685.3 | ok..but | RDF::RDF | Rick Fricchione | Tue Nov 03 1987 13:48 | 8 |
Yup, I did see a wind-vane autohelm setup. It suprises me though,
that you need a special rudder to use one.
On my embarrassing 12 meter correlation: What exactly do the trim
tabs/inner wheel on a 12 meter do?
Rick
| |||||
| 685.4 | Tabs on trailing edge of keel | STAR::KENNEY | Tue Nov 03 1987 16:32 | 1 | |
| 685.5 | windvanes | MSCSSE::BERENS | Alan Berens | Tue Nov 03 1987 21:55 | 22 |
windvanes: There are many different windvane designs with various performance characteristics. Some operate entirely independent of the boat's main rudder (eg, Sailomat), some operate in conjunction with the boat's main rudder. All modern vanes capable of steering large boats use a servo mechanism to develop enough power to steer the boat. An example is a trim tab on the trailing edge of the main rudder. The tab is easy to rotate because it is small. The sideways force on the trim tab is enough to turn the main rudder. More sophisticated vanes (servo pendulum designs such as the Monitor, Aries, and Fleming) are capable of steering quite large boats in really bad weather (eg, a Monitor steered a Valiant 47 during most of the last BOC). There are several excellent books about windvanes. An excellent source of advice and vanes from different manufacturers is Scanmar Marine Products in California. Scanmar is run by two fellows who circumnavigated some years ago. We bought our Monitor vane from them. Alan | |||||