| || |
| Re: Up Wind rudder stall
06/02/04 04:11 PM 06/02/04 04:11 PM
Joined: Oct 2001 |
Flensburg, Germany Fritz
Joined: Oct 2001
most of the time it is the rudder itself.
Rudders on a Hobie 16 must be extremely stiff to prevent a spin out.
That can only be solved by using slim profile and stiff rudders. Carbon Fibre is the best solution nowadays.
If you have Lexan rudders, okay, you will always have that problem.
If you have the old black EPO rudders, the problem will be less but still existing. The factories do not such a good job on rudders, even with the white rudders you have a too thick profile that let the rudders stall, if you sheet in too tight and move the rudders extreme.
Solutions are there on the market.
Another practical one: Do not move the rudders so quickly, but try and steer softly that may also help.
Raking the mast needs to be "counter" raked with the rudders, you have to rake them forward, so that the weather helm is gone. But rake only is not the problem for stalling.
Hope this helps a bit. Happy to tell you more.
| Heavy air/rudder stall
06/07/04 07:29 AM 06/07/04 07:29 AM
Joined: Jul 2001 |
Virginia USA CMerrell
Joined: Jul 2001
Heavy air: Since opinions on rig set up seem to diverge as wind speeds increase, it is helpful to know the wind and sea state, and also crew weight, for heavy air rig set up. At the Worlds it looked like they had strong, steady winds and big (6 foot) waves. Also, the top teams were probably around the minimum crew weight. In that case, the Galvin set up makes a lot of sense.
In the same conditions with heavier crews, backing off the jib halyard tension a smidge (.5 to 1 inch) would help to power up the sail plan to get through the waves.
An "old school" technique is to back off jib halyard tension a lot (2 to 3 inches) in strong but very puffy wind. The idea is to spill power from the top of the main sail in the puffs.
At some point the sail plan is taking all the wind power it can stand. Above that the sails need to be depowered and there are many techniques that will work and you can have very different set ups boat to boat. Wind, water and weight (3 W's) all need to be considered. Someone should write a book about that!
Rudder stall: Moving crew weight back on the boat can solve the stall problem. I don't know the theory why (rudder "digs in" more?).
1 registered members (brucat),
guests, and 234
May 12th, 2017