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From the ATA rule book


F. RULES FOR THE USE OF RADAR GUNS AND CHRONOGRAPHS TO SET TARGET SPEED
There are two types of radar guns, high-power and low-power.The practical difference between them is that high-power guns work reliably from the 16-yard line and low-power guns do not.
High-power guns (Decatur, Stalker, most “police radar guns” and similar) may be used at the 16-yard line. The trap oscillation is stopped, and the target measured is a straightaway. The gun is pointed horizontally. The correct speed for a singles or handicap target is a minimum of 42 MPH, maximum 44 MPH. The correct speed for the right target of a doubles pair must be a minimum of 39 MPH, maximum of 41 MPH.
Low-power guns (SportRadar, Bushnell, and similar) are to be used at the back of the traphouse and at the level of the top of the traphouse. (Holding the gun higher than that will lead to a target which is too fast.) The trap oscillation is stopped, and the target measured is a straightaway. The gun is pointed horizontally. The correct speed for a singles or handicap target must be a minimum of 42 MPH, maximum of 44 MPH. The correct speed for the right target of a doubles pair must be a minimum of 39 MPH, maximum of 41 MPH. When a radar gun is used from inside the house, the correct speed for a singles or handicap target must be a minimum of 44 MPH, maximum of 46 MPH. The correct speed for the right target of a doubles pair must be a minimum of 41 MPH, maximum of 42 MPH.
A chronograph is to be used as close to the trap as practical and tipped up at approximately the same angle as the height of the target. The correct speed for a singles or handicap target is 67 ft/sec minimum, maximum of 70 ft/sec. To set doubles with a chronograph, set a singles target to 76 ft/sec minimum, maximum 79 ft/sec. and then switch the trap to throw doubles without changing the spring tension.


Note: target speed may be set by distance as above or by speed as determined by a radar gun or chronograph.Target must be set by measured speed or distance.
 

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If you have Pat Traps, forget the gun. Buy a chronograph. Pat Trap makes a bracket that slips on the machine and holds the chrono. Make a short cord throw button.....if your T bars can be set into a holder, one person can set targets and not leave the house.
 

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If you have Pat Traps, forget the gun. Buy a chronograph. Pat Trap makes a bracket that slips on the machine and holds the chrono. Make a short cord throw button.....if your T bars can be set into a holder, one person can set targets and not leave the house.
By the time you’ve jacked around with that setup the team with a radar gun has set and checked 10 fields and the first flight is on the line shooting.
 

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Here we go.
With a velocity set by radar gun check and a height at 10 yards ( before wind has much effect at all ) you have as much of a legal target ( rule book requirements of height and distance or speed ) as you will get.
 

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Here we go.
What is the point about any of this? First squad out complains targets are too low and has them raised before they shoot. Ten squads later, squad 11 complains they are too high and has them lowered.
 

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If you have Pat Traps, forget the gun. Buy a chronograph. Pat Trap makes a bracket that slips on the machine and holds the chrono. Make a short cord throw button.....if your T bars can be set into a holder, one person can set targets and not leave the house.
Neil gave my small 2 trap club his for a cup of coffee, it works great.
 

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If you have Pat Traps, forget the gun. Buy a chronograph. Pat Trap makes a bracket that slips on the machine and holds the chrono. Make a short cord throw button.....if your T bars can be set into a holder, one person can set targets and not leave the house.
This caught my eye and I called Pat about it. Unfortunately they no longer make or sell the bracket. They said the same system can still be used with a chrono stand and is very reliable. I am debating whether to invest in a chrono or a radar gun at this point.
 
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