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2012年07月26日

Yacht rules

At the Trenza Yacht Club, we have used only two rules so far:
1. Starboard tack preference
2. leeward yacht preference

Now we will add the following three rules.
3. Overtake with care: Overtaking yacht should avoid the one in front.
4. No blocking: A yacht with preference should not block others intentionally.
5. Inside first; When rounding buoys, outside yacht should give water to inside one.

Let us practice the first two again. The one from right has advantage over the one from the left. At real races, most yacht start from the right side. In the following pictures, blue shows a yacht that has preference, and red should yield.



If two yachts are coming closer, the leeward (blue) has preference and the windward (red) should give water.



Although the leeward yacht has preference, it should not change the course toward wind over the proper course. Proper course means a line that would be taken when there is no other yacht. Normally it is about 45 degrees toward wind when sailing upwind. Anyway, you should not disturb others intentionally.




When rounding buoys, an inside yacht has preference. This rule overrides rule 1 and 2. The yacht coming from outside should provide enough water for the inside yacht to make turn. You should not try to block the inside yacht by reaching the buoy first.



Running after the blue buoy. It may be hard to get speed in this section. It is advantageous to go from right, harder to increase speed on the right side. Also the inside yacht has preference, in these cases the blue one is leeward yacht too. At the yellow buoy turning toward wind, the windward yacht becomes inside and will have preference.



Left side of ship is called ‘port”, and right, ‘starboard’. It can be memorized the word ‘left’ (port) is shorter than ‘right’ (starboard). A situation sailing with wind from right is called ‘starboard tack’, and opposite is ‘port tack’. These words are used often in rules. At running stage, the wind is coming from the opposite side where main sail is out. Tow yachts in the above picture are both ‘port tack’.
  

Posted by Temi Oyen at 06:42Comments(2)Yacht

2012年07月19日

Spinnaker at abeam

Max Starostin the founder of FEYC attended the mini-race last time and taught us that the spinnaker of Flying Taco is also effective with side wind. It will work when the wind angle is more than 90. The necessary spinnaker angle will be wind angle minus 90.



The above is coming to the blue buoy with speed of 9.9 knots. Since there is neither turn over nor speed deducing effect by heeling, it is OK to lean without worry. But it needs care not to touch buoy with the leaned sail that has invisible square prim. The below is using Ctl+Alt+T to show the total sail. Regardless the customized appearance, this square area is physical. It may not be interfered with the water.



The spinnaker effect is wonderful. My best time was around 2:15, but I got 1:55 at the first try! It could be more complicated since the spinnaker adjustment will be required in three sections not only the leeward one.
  

Posted by Temi Oyen at 06:47Comments(0)Yacht

2012年07月08日

Shadowing

There was an interesting case in the mini-race held on Tuesday. When my yacht was sailing side by side with Blues, suddenly my yacht lost speed. There is an effect called "wind shadowing", where a leeward (downwind) sailboat's wind can be blocked by a windward (upwind) sailboat. Amount of shadowing is a function of distance, wind speed, apparent wind angle, and sail configuration of the blocking boat. This cannot be noticed in personal practice, but please watch it in mini-races when you pass the leeward side.

  

Posted by Temi Oyen at 07:18Comments(0)Yacht

2012年06月30日

Yacht Practice 4

The last practice for Trenza Yacht Race. Please see the old articles for the details.

First lesson: http://temisirbu.slmame.com/e1244741.html 
Second lesson: http://temisirbu.slmame.com/e1249216.html

Important points in the first lesson:
1. To learn how to reduce speed or stop by opening the main sail.
2. To learn how to start the yacht from standing still. Method A or Method B.
3. To check how long it takes from various points to the start line.
4. When countdown started, start the yacht before the time that is required to the start line.



There are two rules.
1. Right yacht preference (when coming from different direction)
2. Leeward yacht preference (when coming from same direction)



Important points in the second lesson:
1. Angle adjustment is also required for spinnaker that is wind-angle minus 90.
2. Raise centerboard while running before the wind. Be sure to down it before the next turn.
3. Preset necessary command in Button HUD.
4. Preset method is ‘button X command’, ex. button 7 spinnaker 80.



In the above condition, the yacht speed reached 6.8m/s which could be more.
To get speed, please refer to the previous lesson regarding DG-470. The principle is the same.
http://temisirbu.slmame.com/e1171038.html 

This will conclude the June lesson. Mini-race will start from next Tuesday. The starting time will be changed every other week. Please come at the time that suits your schedule. Start time on the next Tuesday will be 21:30.
  

Posted by Temi Oyen at 06:30Comments(0)Yacht

2012年06月23日

Yacht Praqctice 3

We practiced spinnaker, centerboard, and Button HUD.

Info HUD and Button HUD are possible to be moved to desirable place by ‘Edit”.
Info HUD background can be changed to transparent by touching it.

Let’s practice the spinnaker first, which is a round sail for tailwind.

Touch the ‘spinnaker’ button at the top of Button HUD. A dark sail will come out in front of the main sail. Touch again the button to erase it.



Spinnaker is effective only with tailwind. When it is not effective, it will turn black.

Note the fourth number in the Info HUD, ‘spin angle’.
Spinnaker also needs angle adjustment as the main sail. Since the spinnaker is moved directly, there is only one angle number.
Watch how the number changes by touching Page UP and Page Down.

The best angle for the spinnaker is wind angle minus 90 degrees.
The angle is set as 0 when it is deployed, so it needs adjustment to about 80 degrees.
The spinnaker turns black if the angle is not correct even in the tail wind.



Let us practice the centerboard that is a flat board protruding from the bottom to make the yacht possible to sail with an angle toward the wind.
It will make resistance, so it is pulled up when running with tailwind.

Touch the ‘centerboard’ at the top of Button HUD and watch the black circle right below the Info HUD. The bar in the circle shows the condition, vertical is down, lateral is up.

In the Trenza Yacht course, the centerboard will be up when running behind the island, but it should be down again before the next turn, otherwise you cannot make turn.

Wow, there are so many things to be done at the blue buoy! To change the direction, to adjust the main sail angle, to extend spinnaker, to adjust the spinnaker angle, and to pull up the centerboard! If you do all these through command, the yacht will lose speed meantime.

Here comes the Button HUD.

Button HUD is like a programmable function key of PC. It is possible to preset necessary commands on these buttons. There are several commands were set already. You can use them as they are.

Touch ‘sheet 20’ and watch the sheet angle increased by 20. Touch other buttons and see the effects.

In order to set a new command, chat window is used.
At first, memorize the number of button. The bottom left is 1, next right is 2, accordingly 3,4, and the top ones are 9 on the left and 10 on the right.

It is recommended to leave ‘spinnaker’ and ‘centerboard’ as they are so far.
To set a new command, type in ‘button X command’, ex. button 7 spinnaker 80.
Multiple commands cannot be set on one button.

The command to be set depends on the line that you take. For an example, if you would like to change the main sail angle from 25 to 48 at the red buoy, preset the button 1 as sheet 23. When turning the red buoy, touch the button 1 while changing the yacht direction.

When turning the blue buoy toward tailwind running, while pushing left arrow key to change the direction with left hand, touch the following buttons in sequence by right hand, ‘sheet -32’ , ‘spinnaker’, ‘spin 80’, and ‘centerboard’

How to get speed is the same as DG470 that was explained in the previous training.
Please see my old article in my blog
http://temisirbu.slmame.com/e1171038.html 

  

Posted by Temi Oyen at 06:40Comments(0)Yacht

2012年06月15日

Yacht Practice 2

The yacht practice on June 12 was canceled due to SIM maintenance. So this time is written lesson only. We had practiced two ways to start a yacht. This time let us practice starting using the methods.

Method A:
1. Direct the yacht toward the wind and stand still.
2. Set the sheet angle to desirable number (ex.25) and stand by.
3. Start the yacht by changing the direction toward the target (ex.50).




Method B:
1: Direct the yacht toward the wind and stand still
2. Set the sheet angle to a large number (ex. 60)
3. Turn the yacht toward the target. (ex.51)
4. Type in “Sheet -35” (=60-25) in the chat window without touching Enter and stand by.
5. Start the yacht by touching Enter.




Please take a close look at the right side of each picture. The blue allow showing wing direction is different. The yacht is facing toward wind in Method A and toward the target in Method B. When there are other nearby yachts, Method B may be beneficial in changing position or making a feint.

Now let us practice starting. Prepare a watch that has second hand.

Starting practice procedure are:
1. Open the sail along the wind and let the yacht stand still while raising.
2. Check own yacht position regarding a map or surrounding terrine.
3. Start the yacht with Method A or B and measure the time to the start line.
4. Repeat the above from different position and see how long it takes from each spot.

Important points are 3 and 4. It is better to have as many spots as available for your stat.

Seconds to the start line could be depicted like the following picture. This is not actually measured. The time is different according to the starting method or personal line that is used. It is the best to create own image and to be able to start from any spot.




The lines are not set equally spaced considering time for acceleration. It can be said that the farther the starting point, the more the speed gained.
These yellow lines are also related to the ranking toward the goal. After turning the yellow buoy, yachts on the same line are in the same ranking.

Now let us activate the timer and practice starting actually.
At the first time, do not hesitate to make flying and pass the line as it is. Check by how many seconds you made flying and adjust the next start with that number.

By practice, you may be able to start from any position or during making circle with a good speed.

When two yachts are coming into collision, there are many rules, but at this time let us use only two rules in this club.

1. Right yacht priority
It is OK to come to the start line from either side. But if there is a possibility to collide, the yacht from the left should give a way to the one from the right.




2. Leeward yacht priority
There may be a case to change the way toward parallel to the line when coming in too early, but if there is another yacht next to you, you should not disturb the course of the other. If you come in too early, only you can do is to open the sail and reduce speed.




Strictly saying, when two yachts are getting wind in opposite side, the right yacht has priority, and if getting wind in same side, the leeward yacht has priority.

If you started too early toward the starting line, in most cases there is no way to recover. So practicing is very important.

Next time, let us practice spinnaker, centerboard, and Button HUD.
June 19: 21:30~
June 26: 22:30~
See you!
  

Posted by Temi Oyen at 06:39Comments(0)Yacht

2012年06月09日

Starting yacht

A yacht practice meeting was held at Trenza Yacht Club. There are two ways to start yacht.

Method A:
1. Direct the yacht toward the wind and stand still.
2. Set the sheet angle to desirable number (ex.25) and stand by.
3. Start the yacht by changing the direction toward the target (ex.50).



Method B:
1: Direct the yacht toward the wind and stand still
2. Set the sheet angle to a large number (ex. 60)
3. Turn the yacht toward the target. (ex.51)
4. Type in “Sheet -35” (=60-25) in the chat window without touching Enter and stand by.
5. Start the yacht by touching Enter.
.  

Posted by Temi Oyen at 16:22Comments(0)Yacht

2012年06月03日

Flying Taco

At the Trenza Yacht Club, to sail Flying Taco is becoming popular recently. This yacht will be the next official racing yacht of the club. The one with the sail up is Taco that may be a bit simpler than Flying Fizz introduced last time. The two left are by WildWind, which were really cute. Could anyone make it possible to put them on sale again? There is a free version of Taco.
Home of the Flying Taco: http://slurl.com/secondlife/Gray/32/152/22




This yacht is the first one I experienced when I started SL. I feel a longing for the first lesson that was held at FEYC. I think also there are several level of difficulty. I would start practicing again from the beginning.




The following is a part of "Quick start instructions" of Flying Taco. It says "Skip the first four paragraphs if you like – the rest of the instructions are actually important". I think not many people read this through, so I put it here.

Congratulations on owning the legendary-in-its-own-mind "Flying Tako" sailboat. I know it might not look like much, but this is without a doubt one of the most realistic virtual sailboats you can buy in Second Life, at least in terms of operation and dynamics. I've tried to make the Flying Tako sail as realistically as possible, making compromises only when computing speed was at stake or I was too lazy to figure something out.

People have been sailing the "Tako" (as it is affectionately known to its fans - to its detractors, it's known as the "Flying Crappo") for literally thousands of years. Most archaeologists agree that the first Flying Tako was built in Ancient Egypt, probably around 2350 BC according to advanced microastrological dating methods. Back then the builders had to use mud, reeds, and rat hides for the construction materials. Egyptologists believe Flying Takos were originally used by smugglers to ferry camels across the Nile River, there being no such thing as helicopters in those days. Over the next dozen centuries or so, as the science of sailing evolved, the Egyptians added a sail to the Tako, and then a rudder, and then finally a handle for the rudder - what we now call a "tiller."

Believe it or not, but the original Takos were considered to be status symbols, much like Hummers or Camaros are today. The royal tomb underneath the Great Pyramid in Giza has a depiction of King Takokhamen sailing his Flying Tako at the head of an enormous fleet of galleys and barges, presumably leading the way to the Royal Beach House on the Mediterranean (scholars dispute the interpretation of the accompanying hieroglyphics - some believe that Takokhamen may have been fleeing authorities over charges of running a pyramid scheme).

Over time, with the invention of the assembly line and the discovery of new rat-skinning techniques, Flying Takos became much more affordable. Today's Flying Tako may look a little different from those first boats made out of sticks and mud, but it still uses that most ancient of power sources... WIND! (or in our case, FAKE WIND!)

  

Posted by Temi Oyen at 07:17Comments(0)Yacht

2012年06月01日

Yacht race

A yacht race was held at Trenza Yacht Club last Saturday. The yacht was the flee version of Flying Taco. Yacht is said to be the most realistic vehicle in SL. If you have not tried racing, why don't you start now? The time is measured automatically. Count down will start on the start line, and you will pass the line after the count becomes zero. It is better to gain speed by sailing from far behind, so musical chairs before the start is also a part of racing.



At the time zero, the line will change from red to green. The white yacht started almost time zero, and the red one did also well. The rest two missed the timing. Premature start will not be disqualified but needs to go back and pass the line again, which makes a big loss.




You can take any line as far as go around buoys as required. These two yachts came to the goal from different directions. It is a joy of racing to find which line is quicker.
Practice is held every Tuesday at Trenza Yacht Club. Please join!
Trenza Yacht Club: http://slurl.com/secondlife/SIEN/124/93/29


  

Posted by Temi Oyen at 06:38Comments(0)Yacht

2012年05月28日

Yacht

Sail board race was held at Trenza Yacht Club last Saturday. I was wrapped up doing the race and not possible to take SSs. This one was taken before at Baba Yacht Club. The famous yacht shop WildWind has gone and many yachts including this sail board are not abailable anymore…




Instead, I brought out Flying Fizz that I obtained long ago. The three yachts in front are from left to right, WildWind DG14, my favorite DG470, and Flying Fizz that is available now for free. The gorgeous one on the far right is owned by Mediadream the landlord. This pier is for club members, so it is possible to rez a yacht and sail out to the Linden sea any time.




Flying Fizz is size larger than DG470 that was used for official boat at our club. There are four levels of difficulty. The easiest one requires only rudder operation. The top level needs from weight change and sail shape adjustment. I tried to sail at the first time and overturned instantly.




Overturn can be caused by too much heel or too strong wind. Animations are set to step on the center board and recover the boat. It will be a big loss when did it during racing.




The camera position is too realistic and low that does not provide good command of view. Still it is nicer to fly away with DG470. Flying Fizz is available at the club house.
Waypoint Yacht Club: http://slurl.com/secondlife/Newport%20Bay/38/63/22



  

Posted by Temi Oyen at 06:37Comments(0)Yacht