本帖最后由 hefengeagle 于 2013-10-23 17:35 编辑
船坛需要你和我。
鸣谢：给我原资料的老蒋大侠
In combination with "The Prop Duplicator", very highlevel performance of RC Boats is possible. Thedata presented here is an excerpt from the InstructionManual and Technical Notes provided with every"Prop Duplicator" sold. Iused MOST of the bending methods to develop the "Master Prop" fromwhich each duplicator was molded! I hope you find this short technical datasheet helpful!Some ideas thatyou can use to modify your props in a way which will add increased performanceare
noted on this Tech Note Sheet. All items have shown improved performance insome applications.
You can experiment with any or all of these items to try to improve yourperformance above the
"re-bent prop off the Prop Duplicator."
螺旋桨技术 结合“桨叶复制者”(一种调好的商品桨叶)，航模用高效能的桨叶成为可能。下面的数据从“桨叶复制者”的说明书中摘抄，当然我也用很多文章中提到的方法来打磨大师级桨叶！希望这个简短的技术文章对你有用，一些方法对于提升桨叶效能很有帮助。你可以根据自己的需要选择使用。-----------------------------------------------------------------------------------------------------------------------------
Areas to BendProp: 14 & 16 SeriesRefer to figure #1 and you will see A,B, & C bend lines. You can bend on any or all lines and increaseperformance. Put into your mind that this area should be like a very gradualski jump area with any changes in pitch a smooth increase over the rear of the propblade. (If you don't make this area a smooth ramp, you will add cavitation andactually make the prop less efficient) Add pitch in a VERY TINY AMOUNT to lineC,more bend to line B, and the most bend on line A. Area D is the outer edge oftheprop. In this area after you make bends in areas A, B, C you will have createdsome wrinkles in the edge.These wrinkles should be smoothed out with pliers. Imight tell you that bending on lines B and C are much more critical than bendson line A. You can get good performance with bends on line A only. Don't bendprop in other areas in any LARGE AMOUNT. You can experiment in other areas butbe very careful. Bending areas along the outer edge will add or decrease lift.Added cup to the outer edge decreases lift and flattening the outer edge addslift.
桨叶的弯曲区域：14&16系列如图1所示，你可以观察到A,B,C三条弯曲线。你可以通过改变一条或者多条来提升桨叶性能。请牢记：这些区域如同一个非常平缓的滑雪跳台，区域内任何弯曲都要做到平缓，让不然，就会增加空穴效应并降低桨叶效率。从调整量上来说，C线所需要的调整最小，B线调整量增加，A线调整量最大。D区域是桨叶的边缘，当你调整A,B,C的曲面之后，将会增加这个区域的褶皱，需要利用钳子去除这些褶皱。我可能会告诉你，对B，C线的调整要比对A的调整更加重要。当然，你也可以通过只调整A线来提升桨叶效能，千万不要对桨叶做出大量的调整。你也可以小心地尝试调整其他区域。弯曲区域和桨叶的边缘将会增加或者减少桨叶的升力。对于桨叶边缘，增加杯口形状将减少升力，而让边缘平整将增加升力。
-----------------------------------------------------------------------------------------------------------------------------
Areas to CutProp:Refer to figure #2 for removal of the"Tongue Area" of the prop. This area has been found to greatly limitthe top speed of all props. If you will, visualize a prop entering the waterand starting to move the water along the prop. The water is started along theprop at the Tongue and accelerated in increasing pitch until it is dumped offthe rear edge of the prop. The next thing that enters the water is the tongueof the other blade THAT IS THE LOWEST PITCH PART OF THE PROP. This is as ifhaving a governor on the boat since this lower pitch will slow the boat downfrom the push it got from the water exiting the trailing edge of the previousblade. What to do!! Just cut off this tongue area and you will see a HUGEincrease in acceleration and much higher top speed. A note here that this worksreally well with 14 series props but is UNBELIEVABLE on X Series props.
桨叶切削区域：.如图二所示，去掉桨叶的舌头，这个区域将会很大程度上限制桨叶的最高速度。想象一下，水流通过桨叶的舌头区域，到高螺距的区域水流加速，只到水流被崩出桨叶边缘。接下来，下一个叶面的舌头区域入水，而这个舌头区域正好是螺距最小的地方。这样，小螺距将会减慢船速。如何改善？把它切掉，你将会看到桨叶能效和桨叶速度有巨大的提升。这种调整对于14系列桨叶很有效，对于X系列的调整更是“不敢相信”。
-----------------------------------------------------------------------------------------------------------------------------
BackcuttingProps:Refer to figure #3 and figure #4.Backcutting props will allow you to remove an area of the prop that loads theengine and provides little speed at the upper end of the RPM range. The areawhich you backcut is only effective when the prop is in its lower RPM bands.There are high engine loads at these RPM areas. Not a very desirable effect ifyou want to push a lot of pitch and go very fast. A short side note should behelpful here. I raced at a State Series Event in southern Indiana a few yearsago and was soundly beaten by a good racer. On the way home I was trying tofigure out how to reverse this result the next time we met. After ponderinglong and hard it was evident that I had to deliver more pitch to go faster, butwith more pitch came more load to the engine. What if I removed material fromthe trailing edge of the prop and added more pitch to the tips and bends at A,B, C? This proved to add the MPH I needed to reverse the tables the next time.Some time later another local guy tried this back-cut by using a slightlydifferent method. Look at figure #4 and you will see that he used a ball millor dremel to make a round cut and accomplish the same reduction of load in thetrailing edge. Both methods work very well.
桨叶回挖区域：如图三和图四所示，回挖是让你去掉影响 发动机内耗的区域，但并不能提高发动机的最高转速。这个区域的调整，只有当发动机在标称转速之下工作时有效，这个时候发动机有很大的负载。增加桨叶螺距并不一定会增加船速。可以给你讲个小故事：我曾将在XXX地 比赛，结果被一个高手打败了，回家的路上我一直考虑如何下次反败为胜，深思熟虑之后我决定用大螺距增加船速，但是大螺距同样增加了发动机的负载。如何我把桨叶的拖拽部分去掉，并且增大螺距并调整A,B,C?事实证明，我成功了。时候，本地有个家伙用图示四的方法调整，用打磨机摸出来一个圆弧状的缺口，也很大程度上降低了发动机负载。两种方法都不错。
-----------------------------------------------------------------------------------------------------------------------------
New Items:I saw somethingat the I.M.P.B.A. Internats, that is very interesting in its possibleapplication. Assuming that the water exits off the trailing edge, andespecially the tips of the prop, there may be an advantage to exiting the waterall at one time. A very successful individual had started working on a cuttingmethod that he says will accomplish this. Look at figure #5, you may want toexperiment with this. It has reportedly worked very well with full sizeoutboards. Another item which is very interesting in its possible application,is the cupping of the extreme tip of the prop in order to keep the water fromspilling off the sides of the prop. This will force the water to exit off thetrailing edge of the prop and gain all possible pitch ramping. Experiment withthese. They may gain you a great deal of performance.
新发现：我在IMPBA上看到一种很有意思的事，假设水从桨叶后缘流出，水可以很快流完（估计是反转桨叶，没有后缘的阻碍，水流更快）。有人很快根据图五所示进行修改，据报道对于大型船外浆的船很有效果。另一个有意思的事是这种方法可能的适用性，将桨叶边缘内卷形成一个杯口状，从而防止水流从桨叶边缘流出，这样桨叶会迫使水流从桨叶尾端流出，从而增加推进力。尝试一下，说不定你可以很大程度提升桨叶表现。
-----------------------------------------------------------------------------------------------------------------------------
Current BestShape Modifications:At this point in time, the drawingsabove are in my opinion the best modifications for 1400 Series, 1600
Series, and X Series props. Bending points for each are shown by line andshaded areas are portions to
remove. Some people have had success with "Texas Cutting" X SeriesProps. I have not worked much
with this, so I don't have an opinion.
时下最流行的形状：下图是我认为1400系列，1600系列和X系列桨叶最好调整形状。每种桨叶弯曲点如图所示。有些人所这种方法对“TexasCutting”X系列也试用，我没试过，不发表评论。
-----------------------------------------------------------------------------------------------------------------------------
| 
/1 
发表于 2013-10-23 17:29
收藏
