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溪流漂流必备技巧之——Boof

溪流漂流必备技巧之——Boof

转帖自222俱乐部  作者:Peter


The Black Art of Boofing
BOOF 的奧妙



1. 到底什麼是boof?
成功的boof可能是下溪活動中唯一重要且必學的技巧, boof的概念就是在下落差時,
為了要避免可能撞到下方的石頭或掉入水洞中, 而提高船頭使得入水時船身能夠維持水平
或甚至船尾先入水的動作.


   下落差時提高船頭可以維持船本身前進的力量和下墬時所增加的動力,使得你可以在入水時加速讓船前進,以避開可能遇到的狀況,
如: 衝撞岩石, 岩縫卡船或是被倒吸回水洞中.然而,若是操作不當,它也是非常危險的動作,如boof下30呎的平水, 會造成嚴重的傷害,
特別是你的脊椎. 所以學習如何以及何時boof是非常重要的



(上圖為拓荒小虎於泰崗溪boof下落差)
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2. To boof or not to boof, that is the question
是否了解何時該與何時不該boof所造成的差別可能是一趟愉快的下溪之旅或是進了醫院,輕則頸部扭傷,重則脊椎受傷. 這是因為即便是使用圓底船水平下水時, 不管是5呎或是25呎高, 所有的衝擊力量都是由你的背,更確切的說,你可憐的脊椎來吸收.
在考量是否適合boof時, 最重要要注意的是落差的高度,以及入水點的深度和狀況. 即便是世界排名的好手也不會刻意boof超過大約20呎的落差因為如此一定會造成背部的傷害.
要boof 一個落差前仔細觀察入水點是否是”軟”的. 滑雪的人不會去跳一個落點結冰的峭壁,所以你也不該去boof一個瀑布,如果它的入水點硬又沒有白泡沫, 或更糟的是,水下還有石頭. 最理想的是你boof的入水點是軟而有很多氣泡的, 它會提供最佳的緩衝效果讓你免於恐怖的背部傷害.
最後一個考量是否boof必須要注意的地方是落差下方入水點的水深. 觀察入水點的水深這點非常重要因為假使你沒有boof,而是船身垂直船頭直接撞擊到水底,即便是很小的落差也會讓你的腿或腳踝受傷, 或是尷尬地被卡在中間. 所以在這樣的狀況下boof是較好且較安全的選擇.

3. Boofing for beginners
當你偵察一個落差後決定需要boof, 你必須知道如何正確的操作這個技巧. 最常見的boof錯誤動作是在不對的地方和太早boof, 兩者都會讓你掉進那個原先你想避開的超級吸人hole. 或是更遭的話, 回家後得花錢請人喝swim beers. (脫出的人請客!)
Boof的四個分解動作:
Place--決定從那下落差—通常是落差最低的地方—它提供了讓你最好發射boob的位置, 因為加上適當的划槳,它讓你最容易越過底下的hole. 同時, 在落差邊緣的石頭或岩角也可以是很好的boof平台, 讓你把船頭翹起.
Approach--接近—成功的boof取決於好的approach和有效的最後一槳.當接近落差時,你的速度不需要太快.在到達落差邊緣時,控制讓船和水流的速度一致. 要做到如此,你只需要把槳擺在水流中,讓槳吃到水. 如此可以讓船加速到和水流一致,同時也可以保留體力來應付之後的航程. 如果你在下落差時速度過快, 很有可能你會錯過那最後一槳然後直接掉進下方的hole裡. 請記得, 在作boof時, 少就是多啊!
Final Stroke--最後一槳—這是boof動作中最重要的部分, 因為這一槳讓你往前越過下方的hole. 身體重心必須在船上, 下半身放輕鬆.可以幫助你從落差邊緣送出最遠的距離. 有些人以為如果身體往後仰就可以讓船頭抬起來. 實際上卻是正好相反, 身體往後等於是把腳推離身體,所以通常會筆直地下落差.
Timing是最重要的, 你的最後一槳應該要下在剛好越過落差的最前端,由槳面來產生最大的拉力,才能抬起船頭加速出去. 有時這也表示你的最後一槳在下較淺的落差時, 會抓到落差下墬的水流.
Landing-- 入水--建議入水時有一邊的槳是在水中的. 如此可以讓你在船一入水時就可以控制它. 尤其當落差與落差間的空間較小而你需要在入水後馬上作下一個動作時特別重要. 除此之外, 一樣重要的是在入水時身體要保持前傾(aggressive forward)的姿勢. 因為這樣讓你做好划槳或平衡的準備也可以避免被倒吸回hole中.

Bad boy boofing and beyond
有些時候你只是直線boof一個落差還不夠, 比如說你可能必須直線boof跳出然後使船在空中橫向轉動最後橫著入水.
想像一下如果要船是由左轉右, 你接近落差時稍微面向右邊, 保持與水流同速, 最後一槳由左邊下槳boof然後馬上將左膝蓋抬高把重心移向右方並在座艙前方準備右邊的低手平衡.
重心移轉再加上左槳boof會使船在空中轉向, 使你可以依照需求來轉向. 有可能你會發現少了些速度,加個幾槳就可以彌補回來.

Boofing Clever
Boofing 對下溪而言確實重要, 但切記由高處水平入水是非常危險的, 善用你的判斷力. Boof hard but boof smart!
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好文  ,没认真B过 插不上话

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要硬艇才行,充气舟要做出boof估计难度有点大
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BASIC BOOFING I:



Boofing is the technique of jumping off of ledges and over holes. Keeping the boat at a horizontal, or near horizontal plane as it passes over a steep drop is the safest, and smoothest way of dealing with big holes and vertical ledge drops. By boofing over the top of the hole, our downstream momentum will continue across the top of the reversal current of the hole. Holes become much more problematic when we must deal with the full force of the reversal current on our kayak; by boofing, our kayak stays on top of the reversal, and we face only a fraction of the stopping power of the hole. We are also concerned with the potential risk of hitting shallow rocks or other obstacles that could lie below the surface of any hole, and by boofing we will minimize this risk by keeping our boats high and dry on the surface. In order to achieve this there are three key components:
-The Approach
-The Launch
-The Landing
Let's assess what goes into the Approach phase of a good boof:

-Spotting the ideal launching pad
No two boof are the same, and one of the big factors that determines the quality of your boof will be the place you initiate the launch from. What you want, if possible, will be the steepest part of the drop, and/or the furthest downstream point of the ledge that you're launching off. Steeper drops are much easier to launch from, so they are usually the prefered launch pads. If the ledge has an angle relative to the current, you'll want to head to the downstream end of that ledge to help you land in the downstream end of the hole.

-Reading your water
Understanding what the currents, and/or features on the approach will be critical to making your boat get to the launch pad in control. This might sound obvious, however ignoring this is probably one of the biggest causes of missed boofs. People are often so focused on trying to hit the big boof stroke and catch air that they fail to pay attention to the little details. Watch out for laterals, eddylines, sleeper rocks, and cross currents in particular. Take a moment or two and assess carefully; make a specific and detailed plan of how you will get your boat to that launch pad, stroke for stroke.

-Timing your strokes
As I said above, you want to map it out in your head "stroke for stroke" how you will make your boof. This is important because we want to time our strokes in such a way that we are ready for a big boof stroke when we get to the lip of the drop. The timing of this stroke is almost entirely responsible for how effective or ineffective that stroke is. Often it is just as important which paddle blade we use to boof with, and which paddle blade we land with, so this should also play into your timing. Timing your strokes well is much easier with a slower cadence, thus if you watch a highly skilled paddler run a serries of difficult drops you'll often notice that they are paddling much slower than normal in order to get the timing and placement of their strokes absolutely perfect. Flailing away fast and hard will only lead to random moments of luck rather than consistent success.

-Dealing with the deflection




Often times people think that they've set up for the perfect boof, timed their strokes well, only to find their boat getting pushed offline right before hitting the lip of the drop. Almost all boofs have some sort of deflection that will affect your boat, so you'll want to anticipate that fact and look for ways to deal with it. You might need to compensate for the deflection affect by: adjusting your angle, using a bit more momentum, using a stroke on the opposite side of the boat to keep it from being pushed aside ... etc. Note the slight difference in the approach to the boof in the two photos above, and then notice the difference in the end landing... HUGE difference



Play around with this a bit, mostly at first just be aware of this issue and learn to read your water with a finer eye for subtle details. You'll want to be practicing this in class 2-3 whitewater for some time until you get a good solid feel for this... good luck and have fun.
JB

Safety note: This tip, does NOT apply to paddling over large drops and waterfalls. This technique is ideal for use on ledge holes, and smaller drops with a good deal of aeration in the landing zone. Landing flat on any drop CAN injure your back; the two greatest risk factors to consider are the height of the drop, and the “hardness” (more aeration will soften the landing) of the water in the landing zone. For safer landings this tip assumes that you are boofing off drops no higher than three or four feet, and that you are landing in moderately aerated water. For any higher drops or “harder” landings it will be imperative NOT to land flat! With experience much of this technique can be MODIFIED to use in a wide variety of applications (including certain play paddling moves); it is therefore highly recommended that intermediate paddlers learn to use this technique on smaller features in class 2-3 water. Look for more advanced boofing technique in future tips.

JB
原帖地址:http://go.kayaking.com/tips/topics/basic-boofing-i
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Basic BOOFING 2:



Great boofs take three main components to generate them: the approach, the launch and the landing. Each of these three ingredients is crucial to examine, as a lacking in one will be extremely detrimental to your ability to boof consistently. In this tip we will examine how to get the ideal launch, and how to maximize your distance from that launch. We are assuming for this entire tip that the approach was well set up and executed in order to perform the launch that we desire. (See Basic Boofing I for information on the approach)
Here are three BIG factors that affect the launching phase of a good boof:

-Angle
Sometimes an angled kayak can be easier to launch off a drop than a kayak that is pointed straight downstream. Dealing with a deflecting cushion of water may also dictate some angle in order to compensate for that deflection. You will need to be aware, however, that if there is a sticky hole in the landing you'll want to land as "straight" (perpendicular to the hole) as possible. Note that the launch and the landing are rarely the same angle, in fact often an angled approach and/or launch can be adjusted and straightened out for the landing with a well timed stroke. You may also have an eddy to one side that you can boof into and catch by maintaining a signifigant angle to that side.

-Speed
Speed is great, and speed is bad... as in other aspects of kayaking speed can be both a helpful thing, and a complicating and challenging thing at the same time. The key to using speed to your advantage is to use just the right amount, and at JUST THE RIGHT TIME! In other words; don't start paddling as hard as you can a hundred yards upstream of the boof...you'll probably be out of control long before you ever get to the boof. Try to hold off on speed for the most part, instead focusing on the timing and placement of your strokes. As you become more and more accurate and skilled with timing your strokes well, then you can try to add a little more juice to the last couple of strokes to cary more speed over the lip and get a little more air and distance from your boof.

-The Boof Stroke
Great boofs take three main components to generate them: the approach, the launch and the landing. Each of these three ingredients is crucial to examine, as a lacking in one will be extremely detrimental to your ability to boof consistently. In this tip we will examine how to get the ideal launch, and how to maximize your distance from that launch. We are assuming for this entire tip that the approach was well set up and executed in order to perform the launch that we desire. (See Basic Boofing I for information on the approach)
Here are three BIG factors that affect the launching phase of a good boof:

-Angle
Sometimes an angled kayak can be easier to launch off a drop than a kayak that is pointed straight downstream. Dealing with a deflecting cushion of water may also dictate some angle in order to compensate for that deflection. You will need to be aware, however, that if there is a sticky hole in the landing you'll want to land as "straight" (perpendicular to the hole) as possible. Note that the launch and the landing are rarely the same angle, in fact often an angled approach and/or launch can be adjusted and straightened out for the landing with a well timed stroke. You may also have an eddy to one side that you can boof into and catch by maintaining a signifigant angle to that side.

-Speed
Speed is great, and speed is bad... as in other aspects of kayaking speed can be both a helpful thing, and a complicating and challenging thing at the same time. The key to using speed to your advantage is to use just the right amount, and at JUST THE RIGHT TIME! In other words; don't start paddling as hard as you can a hundred yards upstream of the boof...you'll probably be out of control long before you ever get to the boof. Try to hold off on speed for the most part, instead focusing on the timing and placement of your strokes. As you become more and more accurate and skilled with timing your strokes well, then you can try to add a little more juice to the last couple of strokes to cary more speed over the lip and get a little more air and distance from your boof.

-The Boof Stroke

(midway through a good boof stroke, note that the paddle is right at the hips)

Ok, here is the real nitty gritty of it all, this one little stroke can really make or break that boof. A boof stroke is much like a forward stroke (near vertical paddle shaft, blade close to the boat), except that with a boof stroke you get additional power from continuing to pull the paddle past your hips. A boof stroke will have its maximum effect if planted at your toes just as they reach the lip of the drop. During the boof, with our paddle planted we want to thrust our hips forward, bringing our boat and body up to, AND PAST our paddle (planted at the lip of the drop).

(in this photo, the paddler has just finished with the boof stroke, note that the paddle is way past his hips and almost all the way back at the tail of the boat)

The key here is that as our body passes over the lip of the drop we want to continue driving the boat forward on its horizontal plane; this is where pulling on the paddle as it passes behind our hips provides us with a dramatic booster. During the entire motion it is imperative that we lift our knees, by tightening our abdominal muscles, to keep our boat as horizontal as possible. Often edging the boat slightly toward the paddle can help to maximize the launch, by making it easier to keep at a horizontal plane as well as helping it to track straight across the lip.

Now that you’ve got a great launch, it’s time to land it…

Safety note: This tip, does NOT apply to paddling over large drops and waterfalls. This technique is ideal for use on ledge holes, and smaller drops with a good deal of aeration in the landing zone. Landing flat on any drop CAN injure your back; the two greatest risk factors to consider are the height of the drop, and the “hardness” (more aeration will soften the landing) of the water in the landing zone. For safer landings this tip assumes that you are boofing off drops no higher than three or four feet, and that you are landing in moderately aerated water. For any higher drops or “harder” landings it will be imperative NOT to land flat! With experience much of this technique can be MODIFIED to use in a wide variety of applications (including certain play paddling moves); it is therefore highly recommended that intermediate paddlers learn to use this technique on smaller features in class 2-3 water. Look for more advanced boofing technique in future tips.
JB
原帖地址:http://go.kayaking.com/tips/topics/basic-boofing-2
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Basic Boofing 3:


No matter how well you sky off some great boof, and no matter how cool you look sailing through the air; you still need to pay attention to LAND the boof correctly. Landing the boof can mean all sorts of things; basically landing the boof involves dealing with whatever it is that lies waiting at the bottom of the boof. You may be boofing into an eddy, or into a big hole, each landing zone will require a specific technique to land in control. If we don’t pay attention, sometimes we can get a great boof and then loose it on the landing.
Assuming that all went well with the Approach and the Launch of the boof, well want to make sure that we are landing with our body weight centered and even over the top of the boat with a paddle in the water. We may also need to be landing on a slight edge, like if we are catching an eddy. We may be needing to straighten out our boat, particularly if landing in a hole, or if the boat starts to become pointed at an obstacle downstream. There are many factors, but mostly it's just key that we stay aware and focused even while we revel in that glorious feeling of our boat sailing away airborne over a big boof.
Ideally we will want to begin our landing the split second that our boof stroke is finishing its job, by reaching immediately for our landing stroke. A left boof stroke will lead nicely to a right landing stroke, and visa versa. Reaching for another stroke in mid air will also provide us with a convenient way of keeping pressure on our knees to keep the boat level. While we are reaching for the landing stroke we can perform a “sit-up” type motion, bringing our knees up towards our chest (NOT the other way around!); this not only helps keep the boat level, but also lowers our center of gravity, and provides us with an active paddle blade upon landing.


(The Approach: finishing a draw stroke to set the boat up at the ideal launch pad, this draw stroke is about to turn into a forward/boof stroke. note the slight edge)

(The Launch: a big boof stroke, carried well past the hips while lifting up on the knees)

(The Landing: bringing the knees up to the chest, reaching for a stroke to control the boat in the critical moment of landing, also note the eyes focusing on the landing)
During the launch we may intentionally, or unintentionally, be edging our kayak to one side or another. We will want to transfer our weight off of that edge before we land the boof, other wise we will not land in a very balanced fashion. Landing in an eddy in particular tends to produce a need for an edge transfer in mid air. Say for example that you are driving your boat off a rock on river right, at about a 45-degree angle, into an eddy. When you drive off the shoulder of the rock, the height of the rock will tend to lift your right edge slightly higher than your left. Now as you come off the rock and land in the eddy, you will need to lift your left knee up and shift your weight to your right edge to prevent tripping over your downstream edge. Landing in a sticky hole, with your boat anything other than flat and level will provide the hole with more to grab a hold of to stop you. It is import to “un-edge” the boat before landing, by shifting your weight and lifting up on whichever knee is lower.
Landing involves keeping your kayak under your control during the entire boof sequence. Things to keep in mind are your angle, edge, and what paddle strokes you may need. There is no magic formula that works every time, the information of this tip represents some hypothetical situations to get your brain thinking of the different possible technique that you will need every time that you take a boof. Keep at it…
Safety note: This tip, does NOT apply to paddling over large drops and waterfalls. This technique is ideal for use on ledge holes, and smaller drops with a good deal of aeration in the landing zone. Landing flat on any drop CAN injure your back; the two greatest risk factors to consider are the height of the drop, and the “hardness” (more aeration will soften the landing) of the water in the landing zone. For safer landings this tip assumes that you are boofing off drops no higher than three or four feet, and that you are landing in moderately aerated water. For any higher drops or “harder” landings it will be imperative NOT to land flat! With experience much of this technique can be MODIFIED to use in a wide variety of applications (including certain play paddling moves); it is therefore highly recommended that intermediate paddlers learn to use this technique on smaller features in class 2-3 water. Look for more advanced boofing technique in future tips.
Happy landings…
JB
原帖地址:http://go.kayaking.com/tips/topics/basic-boofing-3
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学习中,好复杂
顺,不妄喜;逆,不惶馁;

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再次学习了,还是觉得很复杂
顺,不妄喜;逆,不惶馁;

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引用:
原帖由 余洋 于 2009-12-24 08:31 发表
要硬艇才行,充气舟要做出boof估计难度有点大
有機會的話,還是可以練一練的...

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