Block the grille: Eaker’s tip is “Always get air around the car rather than through it.” Stopping air from entering the grille has shown dragstrip . reductions of a tenth or two even on 120-mph cars. This will also reduce front-end lift, and when the front end raises due to lift, drag increases even more. (Bonus tip: Stiff front springs can also help prevent front-end lift). Grille blockage is more effective on older cars than on newer ones with sealed radiator areas, and obviously, it can only be used for short-duration events due to reduced engine cooling.
Improvement: 15 to 30 counts of reduction in Cd and 50 to 100 counts in reduction of Cl
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Morse is still widely used by amateur radio operators (hams). Experienced hams routinely send Morse at 20 words per minute, using manually operated hand telegraph keys ; enthusiasts such as members of The CW Operators' Club routinely send and receive Morse code at speeds up to 60 wpm. Twenty words per minute (20wpm) represents the rough upper limit for Morse operators attempting to write down Morse code received by ear using paper and pencil. Many skilled Morse code operators can receive Morse code by ear mentally without writing down the information at speeds up to 70 wpm. To write down the Morse code information manually at speeds higher than 20 wpm it is usual for the operators to use a typewriter or computer keyboard to enable higher speed copying.