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Probable GOLF Instruction
Expertly Shaping Swings & Trajectories
Solving your errant golf ball problems

New -- Social Golfer Combinations

Golf Expert Testimony

I offer my services as a golf expert on the following:

• Errant Golf Ball Trajectories

• Golf Netting Safety Height

• Topographic Errant Ball Analysis

• Adjoining Property Errant Golf Ball Safety Determination

• any litigation involving golf club and ball interactions

Email me at golfexpert@probablegolfinstruction.com for a free consultation and fee structure.

Comparison of Tannar Golf Trajectory Model to Empirical Trackman Data

Trackman is a company that makes a golf ball monitor that uses Doppler Radar to track the golf ball as it flies through the air. It is used by the United States Golf Association, PGA Tour, Royal & Ancient Golf Association, golf club and golf ball manufacturing companies and many golf teaching professionals. It is known as the most accurate golf ball monitor on the market.

Trackman has been publishing some of its empirical results in its newsletters. In its January, 2010, Newsletter, it published PGA Tour and LPGA Tour average statistics for Driver trajectories (Page 6 of Jan 2010 Trackman Newletter, http://trackman.dk/getmedia/e388effb-0686-425b-9824-650d2e123c6e/January-2010.aspx .

Below in the table you'll find the Trackman data as well as the values predicted by the Tannar Golf Trajectory Model which are outputs of a MS Excel Spreadsheet.

My model assumed a temperature of 25 degrees Celcius (77 F), no wind, near sea level. The Trackman data is accompanied by the note, " Please be aware that the location and weather conditions haven't been taken into consideration. Besides these reservations the data is based on a large number

of shots and give a good indication on key numbers for tour players."

Thus, the Trackman data would have been collected at various temperatures, altitudes and wind conditions. Some shots would have been with the wind, some into the wind, some in a crosswind. Note, that if air temperature is higher and altitude is higher, the ball will carry farther.

	Clubhead	Angle of	Ball	Smash	Launch	Spin	Max	Land	Carry
	Speed	Attack	Speed	Factor	Angle	Rate	Height	Angle	Distance
	(mph)	(deg)	(mph)		(deg)	(rpm)	(yd)	(yd)	(yd)

PGA Tour Average
Trackman	112	-1.3	165	1.47	11.2	2685	31	39	269
Tannar Model	112	-1.3	167	1.49	10.3	2374	27	33	259


LPGA Tour Average
Trackman	94	3.0	139	1.47	14.0	2628	25	36	220
Tannar Model	94	3.0	140	1.49	14.5	2043	25	33	215

As can been seen from the data, the Tannar Model predicts quite closely the golf ball parameters measured by the Trackman for the two club speeds of 112 mph and 94 mph.

For some examples of errant golf ball litigations, I've summarized a few here.

Langley, B.C. V2Y 2G4 Canada
Phone: 604-309-7030 FAX: to fax, email an attachment
probablegolf@yahoo.ca or golfexpert@probablegolfinstruction.com

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