Moin,
danke für den Link.
Ich habe das mal grob angesehen. Es gibt wenig verwertbares in Bezug auf mehr Weite/Distanz.
Der Effekt wird theoretisch beschrieben und ist physikalisch berechenbar. Was das aber konkret ausmachen kann, davon ist gar nichts zu lesen.
Wäre das relevant, dann hätten wir sicher sehr schnell entsprechend gefertigte Schäfte.
Die oben eingestellte Abbildung stellt nur das Verhältnis der Partikelgröße/Außendurchmesser des Schaft auf der Länge des Schafts dar. Was kann man daraus ablesen? Ich verstehe den Zusammenhang nicht.
Referring to FIG. 6, a graph 46 illustrates the r/d ratio for shaft 22 as a function of distance from second end 30 for various particle sizes that are utilized in exterior coating 36. In the r/d ratio, “r” is the diameter of the particle while “d” is the outer diameter of shaft 22. Line 48 represents the r/d ratio of shaft 22 with a particle size of 20 microns. Line 50 represents the r/d ratio of shaft 22 with a particle size of 50 microns. Line 52 represents the r/d ratio of shaft 22 with a particle size of 100 microns. The r/d ratio increases along the length of shaft 22 from second end 30 due to the decreasing outer diameter of shaft 22 as it extends from second end 30 to first end 26.
[0029]
As can be seen, the r/d ratio can range from 1.29×10−3 adjacent second end 30 to about 2.27×10−3 adjacent first end 26 for a particle size of 20 microns. The r/d ratio may also range from about 6.46×10−3 adjacent second end 30 to about 11.33×10−3 adjacent first end 26. In the embodiment wherein the particle size is 50 microns, the r/d ratio can range from about 3.23×10−3 adjacent second end 30 to about 5.66×10−3 adjacent first end 26. Thus, the shaft 22 according to the present disclosure may have an r/d ratio along its length in the range shown by the hatched area 54. The surface roughness of exterior surface 34 may reduce the coefficient of drag Cd when shaft 22 is traveling through the air, as described below.
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