where Do is in feet. Figure 59 gives a graphical solution of Eq. 38. The Society of German Engineers (VDI) has adopted a slightly modified version of the Rutschi formula as standard. Rutschi later recommended, in discussion of Reference 62, that the internal effi ciency h = Vhm be used instead of the hydraulic efficiency hh in Eq. 45. The mechanical efficiency hm will probably be very high for both model and prototype for most cases of interest, so good results should be obtained if the overall efficiency is used in Eq. 36.

Model-prototype geometric similarity should include surface finish and wearing ring or tip clearances, but this may be difficult or impossible to achieve. Anderson (see Section 2.1: Figure 10 and Reference 6) proposed a method that includes a correction for dissimilarity in surface finish.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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