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A Brief Message  June 28/05

• Congratulations to Padraig Harrington for his second PGA Tour win this season.
  
• My last newsletter explained how one can adjust club selection for different wind conditionsl. View the previous newsletter here.
  
• Summer is the time of year where one can experience the largest variations in temperature and humidity. Do either make a significant difference in golf ball distances? That's the topic of this newsletter.
  
• I've hit about 6 large buckets of balls while attached to the "Dream Swing" and have found I'm hitting the ball more solidly. I think this swing aid can really help a player develop a more consistent swing that stays on plane. Click here to learn more.
  
  

  View the left hand side of this page for some other great golf gift ideas. Get some great golf books from amazon.com. View my recommended golf science books.

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  Check out my latest calculator. It calculates your handicap index. You can use it whenever you like ensure you're using the right index. Click here.
  

Golf Game Management VII: Temperature & Humidity

Read other Parts from the Technology & Distance series, Short Game series and Off Season Golf series here, Archives.

Check out my new Golf Handicap Calculator

Send me any suggestions you have for the next or future newsletters. Just submit your ideas using this simple form. Now on to this week's topic.

VII. How much must you adjust on a hot, humid day?

    The topic of this this series is Golf Game Management. Can you shoot lower scores without physical improvement? The answer is a resounding, YES! Not that I'm advocating not improving your ball striking and short game skill level.

   Did you ever notice that the ball flies farther on a hot, humid day? If you were hitting the ball well, you probably would. Unfortunately, amateurs tend not to have too many great ball striking days.

   Firstly, I'll share with you how much farther the ball will fly. Secondly, I'll explain the reasons why for those of you that just have to know.

   Humidity doesn't play a huge role, but temperature does. Take a look at the table below. Differences in distances for various clubs differ by a yard or less for different humidities. But the distance differences for temperature are quite significant. The distances in the table are for carry and are measured in yards.

Note the difference in carry between 10 degrees Celcius (50 F) and 30 degrees (86 F) is about 5 yards for all the clubs. For the irons, that's about half a club, which is very significant.

  Of course on a hot day, one would most likely experience hitting tee shots farther than normal because not only would the ball fly farther, it would also roll farther along the firmer fairways.

  On those hot days (hotter than normal) I'd advise playing half a club shorter than normal, especially if the pin is near the back of the green.

   Why the difference in distances? How far the ball flies depends on the amount of lift force and drag force on the ball. A greater lift force enables the fall to remain in flight longer so the ball cal go further. A greater drag forces decreases the speed of the ball so it doesn't go as far.

   The higher the temperature, the less dense the air. There is therefore less drag and less lift. Even though there is less lift force on the ball, the effect of a reduced drag force is more significant. The ball flies farther as a result.

    Many people think that humid air is more dense than drier air. This is FALSE! Higher humidity means a higher concentration of water molescules. Water molecules are less massive than most of the other molecules that make up the atmosphere (nitrogen and oxygen). Thus, more humid air is actually less dense.

   The wind changes the distance the ball flies more when hitting into the wind than with the wind. How much more? I have calculated that with my computer projectile model and reveal the amount in my paper on Wind Speed Effects. You can purchase your copy for only $5.99. Click here.

Order your "Altitude Club Print" now and have greater confidence in your club selection when you travel to different courses. The cost is only $9.99, less than a sleeve of golf balls.

Get more info here.

Take a look below the suggestion box for some more ideas on how you can improve your game.

If you are more interested in finding out which golf ball is best for you and your game, consider the following:

Longest Golf Ball Report -- a statistical analysis of different golf balls hit by an
                                    Iron Byron Robot machine.

Ken Tannar