Download Air Guns by Eldon G. Wolff PDF

By Eldon G. Wolff

В книге рассмотрена история пневматического оружия с древнейших времен по 1909 год, с кратким обзором современного (на момент выход книги) состояния этого вида стрелкового оружия.

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Sample text

These differences are clearly of great significance when making approach shots into a green. Since the differences in carry are caused by the changes in the aerodynamic forces, the time of flight is a large determining factor. For this reason, in high winds a lower trajectory approach shot with a lower-lofted club, resulting in a shorter flight time, is often a safer selection. 7 degrees. 7 degrees to the fairway surface. This negative attack of the ball is standard procedure for elite players.

5 oz. and the drag 3 or 4 oz. It seems likely that these were estimated from the Davies (1949) data, whose lift coefficient for this case is in approximate agreement with Smits and Smith (1994), but drag coefficients are about one-third too high (Bearman and Harvey 1976). 2 rad/s). 29. From Eq. 77 N. Almost two decades after the Bearman and Harvey study, the R&A/USGA sponsored further wind-tunnel investigations, which were published by Smits and Smith (1994) in the World Scientific Congress of Golf (WSCG) II.

It will be shown later in the chapter that the relative drag force, like the lift force, is also very strongly dependent on the ball’s backspin/speed ratio. That is, a golf ball travelling at 100 miles per hour with a backspin rate of 4,000 revolutions per minute will experience approximately the same relative drag force as a ball at 50 miles per hour with 2,000 revolutions per minute backspin. 3 0 50 100 150 200 250 Backspin Rate/Ball Speed (rpm/mph) Figure 2F Relative drag of a golf ball and same-diameter smooth ball.

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