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螺旋桨制作

2018-2-11 16:47| 发布者: dymodel| 查看: 316| 评论: 0|原作者: firpo

摘要: 螺旋桨制作 从Octura金属螺旋桨都是投铍铜。 其他材料可用于制造不锈钢,例如螺旋桨,螺旋桨但绝大多数金属铍铜。 前一个金属螺旋桨可以使用,它需要磨和平衡。 Metal propellers from Octura are cast in bery ...
螺旋桨制作

从Octura金属螺旋桨都是投铍铜。 其他材料可用于制造不锈钢,例如螺旋桨,螺旋桨但绝大多数金属铍铜。 前一个金属螺旋桨可以使用,它需要磨和平衡。
Metal propellers from Octura are cast in beryllium copper. Other materials are used to make propellers, for example stainless steel, but the vast majority of metal propellers are beryllium copper. Before a metal propeller can be used, it needs to be sharpened and balanced.

Surface piercing propeller. Thrust is produced by the concave face, and you must not modify the shape of this face when preparing the propeller or you risk altering the propeller's characteristics. Material is removed evenly from the convex face to sharpen and balance.
I often get asked if I sell ready sharpened propellers, and my answer is always a firm "no". I hate sharpening propellers, and am only prepared to do my own!
It is possible to buy propellers ready sharpened and balanced for you. However, in my experience propeller preparation takes a long time, perhaps as much as two or three hours per propeller. People who sell sharpened and balanced propellers usually do the bare minimum to make a propeller usable, but "usable" is not the same as "perfect". We're after perfection, or as near as it's possible to get, and this means doing it yourself. This is not meant to denigrate those vendors who sell propellers and charge for sharpening and balancing. The blunt economic reality is that time is money, and if you want a near-perfect propeller, then it's going to cost a lot more than one that is merely usable. Ask yourself what price you would put on three hours of your time?
So, what is the difference between a "usable" propeller, and a near-perfect propeller? The difference can be remarkable. The propeller determines motor rpm, run time and speed, and a usable propeller will be down on all three. If you want to win, you need to have decent propellers for your boats - it's that simple.
A propeller with razor sharp, thinned blades does not waste as much energy on each rotation. Thinned, sharp blades enter the water with less impact and therefore create less spray, with more of the motor energy being converted to useful thrust.



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