A. 翹度高度與有效吃水線 (Effective Waterline) Rocker Height & Effective Waterline

有效吃水線是指船底實際與水面接觸的長度，有別於船身長度。船頭與船尾的翹度越大幅度地上揚，有效吃水線就越短。 Effective waterline is the length of the hull actually in contact with the water. Higher rocker heights raise the ends, shortening this waterline.

低翹度 (Low Rocker) 擁有較長的有效吃水線，水流能較平滑地通過船底，直行航速與航向保持性 (Tracking) 較佳，在突破巨浪或強烈倒捲流 (Hole) 時，較不易被側向水流推離既定航線。高翹度 (High Rocker) 除了縮短有效吃水線、提升轉向靈活度，也會改變船首入水姿態；因有效吃水線極短，直行前進時速度通常較慢，也較容易受到急流橫向干擾。 Low-rockered boats with longer waterlines are faster, track better, and resist being pushed off line by heavy holes. High-rockered boats offer quicker rotation and a steeper bow entry angle, but are slower in downstream flatwater and harder to track.

物理迎角與越障能力 (Angle of Attack) Angle of Attack and Obstacle Clearance

船首 Rocker 的絕對高度，決定了船體切入水體的迎角。高 Rocker 類似越野車的高底盤進入角，使船首在遭遇強烈亂流、水洞 (Holes) 或岩石時，傾向於「騎越 (Ride over)」障礙物，而非「刺穿 (Pierce)」水流。這讓船體能利用水流的衝擊力將船身抬升，避免被水洞吸住或吞噬。 The absolute height of the bow rocker determines the hull's angle of attack upon entering the water. Similar to the approach angle of an off-road vehicle, a high rocker allows the bow to ride over features like heavy turbulence, holes, or rocks, rather than piercing through them. This helps the hull use water impact to generate upward lift, preventing the boat from being pinned or swallowed by a hole.

B. 翹度起點：連續型 (Continuous) 與折角型 (Kick) Rocker Start: Continuous vs. Kick

翹度起點決定了船體如何將槳手的重心轉移轉化為動態反應。其幾何特徵可類比為搖椅底部的木弧條：一種是全段皆為圓潤弧線，另一種是僅在兩端折翹、中間保持平直。這項幾何設計也影響 Boofing（飛躍落差時保持船身水平貼水、維持速度並避開水底岩石）的平順效率。 Visualize a rocking chair round throughout versus one flat in the middle with upturned ends. This start location governs how the boat reacts to torso weight shifts, defining its capacity to Boof (a maneuver to keep the entire boat flat when dropping instead of letting the bow dip, carrying forward speed and avoiding rocks, akin to riding a bicycle off a ledge).

連續型翹度 (Continuous Rocker) 自座艙下方即向兩端呈平滑弧線延伸。划手轉移重心時，能較流暢地抬升船頭，Boofing 表現佳，是 Creekers 應對陡峭落差的常見配置；但因底部缺乏平坦滑行面，在綠浪上衝浪的操控性較受限。 Continuous rocker curves smoothly from cockpit center to ends. It boofs exceptionally well, preventing vertical dives, but does not behave well when surfing on green waves. Thus, it is highly favored on creek boats.

折角型翹度 (Kick Rocker) 在中間保留較長且平坦的滑行底面 (Planing Surface)，僅在靠近船頭尾時陡峭上揚。直行航速與平水推進效率通常較好，扁平底盤在衝浪時也較靈活；但在複雜白水中 Boofing 的手感較生硬，缺乏連續弧度的流暢過渡。 Kick rocker features a flat planing zone in the middle with angled bends at the ends. It is harder to boof but the flat planing surface makes wave surfing incredibly fun and flatwater paddling efficient.

C. 翹度形狀：線性 (Linear) 與漸進式 (Progressive) Rocker Shape: Linear vs. Progressive

這項屬性決定了船隻在高落差（如瀑布、陡降）垂直落水時的流體動力學反饋，是守護划手人身安全的關鍵防線。 Rocker progression governs fluid dynamic feedback during high-drop vertical water entries, serving as a critical safety defense for the paddler.

線性翹度 (Linear Rocker) 的上揚曲線弧度保持均勻恆定（近似一條斜直線）。衝下垂直瀑布或陡降落差時，容許的入水安全夾角範圍較窄；若入水角度不夠平，船首不易獲得足夠抬升，船隻可能筆直插入深水（插水 Penciling），進而觸底卡岩或翻覆。 Linear rocker slope remains constant. It provides a very narrow range of safe landing angles; unless landed perfectly flat, the bow is highly prone to burying deeply (penciling), risking bottom contact and capsize.

漸進式翹度 (Progressive Rocker) 在船頭與船尾端部急遽上揚，入水安全夾角的容錯率較寬；即使 Boofing 角度不完美，也較不易插水。大弧度端部類似水翼 (Hydrofoil)，能把撞擊水流向下排開並產生向上反作用力，協助船首快速回復並轉為水平滑行，脫離具回吸力的倒捲流 (Hole)，同時吸收垂直落水衝擊，降低對脊椎的傷害風險。 Progressive rocker features tightening curves at the tips, acting like a hydrofoil to deflect water downward. This delivers a larger range of safe landing angles—even angled entries won't pencil. It converts falling vertical energy into safe, horizontal planing speed to ride away from retentive holes, while significantly mitigating severe vertical shock to the paddler's back.