1st Lesson Balancing the main rotor blade
第一課 主旋翼之平衡
First we will discuss the important of balancing the weight of the main blades. If the two blades are not the same weight, whenever you fly the helicopeter, the helicopter will vibrate vigorously. It will lower the controllability of helicopter or may even cause unexpected desemble of the aircraft. It is because continuous vibration will loose the screws.在這裡先談談磅槳的作用和重要性!!首先,如果主槳重量不一的話,你會發覺起飛後,機身會不停地打震,輕則影響飛行及觀瞻!!重則炒機或空中解體,因為震動能令螺絲鬆脫,到時相當危險,避之則吉,小心小心.............
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First of all, find yourself a digital pocket scale. Measure the weight of one of the blade. 這是個磅槳的好方法,工具小,簡單,快!!大家請備有一個電子磅,磅一下一隻槳的重量..... |
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Then weight the another blade. 再磅一下另一隻槳的重量,,如不一樣,之後教你解決!!就算一樣,也有可能有一些工夫要做!!! |
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Set up a vertical blades as shown in the diagram. 先用一個鉗固定一隻槳! |
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Put the other blade on the first one to locate the point of cetre of mass. 將第二隻槳放上去拿一個重心點!(如圖) |
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Record down the point of centre of mass by a marker. 記下這隻槳之重心點! |
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Do the same for the another blades. 另一隻槳,如前一樣! |
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Again, mark down the centre of mass. 記下重心點!! |
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After that, align the two blades to see whether the 2 centre of mass are identical in position. What you see in the left picture is a good example. If you find that the marked place are not identical, you have to watch following paragraph for solution. 之後拍在一起,看這平衡點是否一致(因為我在噴漆時已用漆油做了這工夫,所以才完全平衡)如不一致請看下文....... |
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Fine some thin tape first. 可用膠紙(最好薄一點),用來更改主槳的重量和重心!! |
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Choose the lighter blades. Add tapes on it to modify the weight and the centre of mass. Our goal is to make the two blades the same weight and same point of centre of mass. 我們會調較輕的槳,如重心偏向內,在外一方加上膠紙令重心外移,令重心一致!!! |
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If you find that the centre of mass of the lighter blade is more outward than the heavier one. What you have to do is to tape the inner part of the blade to shift the centre of mass inward. 如重心偏外,則在內一方加上膠紙令重心內移,令重心一致!! |
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If the blades are already identical in weight before adjusting the centre of mass. What you have to do is to tape the lighter blades at the point of centre of mass after aligning the centre of mass. 如之前兩隻槳重量一樣,則兩隻槳也要加上一些膠紙令到兩槳重量和重心都要一致!! |
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There are other factors that may affect the balance of the main blade. For example, the strengthness of 2 blades, the position of hole of the blades. Therefore it is extremely important for you to buy parts from a shop that has good will. 另外一提,其實有很多因素也會影響到主槳的平衡,如在出廠時兩隻槳硬度有所不同!!另一個問題是兩個槳孔是否一致!! 所以在一些沒有信譽和誠信的地方買槳,可能是你一直炒機的真兇!! |
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This is an example of identical holes of 2 blades. (All blades from our shop are QC passed, if you find any problems, feel free to ask for replacement within 3 days of purchasement.) 這就算是一致了(但在我店購買的槳我己做了監察,如有問題,歡迎三日內更換,多謝!!!) |