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It might be free without the cost of a crony, but it will come with the price of ones "efforts to do". But it's a hobby and no hobby comes problem free. This is a VERY ACCURATE way to find the speed of a dart. You just need someone to see where the peak occurs when shooting and a scale.

Ballistic pendulum chronograph

Ballistic Pendulum calculators
http://hyperphysics.phy-astr.gsu.edu/hbase/balpen.html

Extra Food For Your Thoughts: After you find the speed of your dart this will tell you how hi above your target you have to aim at a known distance in order to hit it dead on. This is also VERY ACCURATE if the above is also done correctly.

Ballistic trajectory calculation

Hope this helps !

Cheers my friends ~ GKU
 
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