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CROSSBOW EFFICIENCY CALCULATOR
A DBB & OGH JOINT PROJECT
Arrow Speed

(50 - 800 fps)
Total Weight

(50 - 1000 grains)
Draw Weight

(25 - 500 lbs)
Power Stroke

(5 - 24 inches)

* The purpose of this calculator is to get the user familiar with the concept of crossbow efficiency. It Is by no means 100% accurate. In order to be accurate you would individually have to test every crossbow. Recurve crossbows tend to increase draw weight as they are pulled back. Compound crossbows frequently have a let off of that draw weight, but even that varies from crossbow to crossbow.

To be as close as possible to 100% you will need a draw board and a scale and take readings from the scale every inch of the draw back and then plot them to get your average draw weight.

The purpose of this calculator is simply to get the user thinking about what factors go in to establishing the efficiency of a crossbow. A more efficient crossbow puts more energy into the arrow, which is what we as crossbow users want.

About This Calculator
This calculator is pre-loaded with Bunjie, Jr.’s specs so you can see how your crossbow compares! Find out how efficient your crossbow is (or any crossbow) by entering accurate data to get a pretty good estimate. Crossbow efficiency isn't talked about very much, but it's quite important. This is a measurement of how much energy your crossbow stores when it is cocked, and how much it delivers to your arrow when you pull the trigger. The higher the percentage of efficiency, the better—more efficiency means more energy imparted on the arrow, and less energy left over. Leftover energy is wasted, dumped into the limbs and riser and scope, and creates sound and heat. More leftover energy means more potential damages to strings, limbs, and other parts.
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