Sep 9 15 10:02 PM

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1. Taking off or heading up: At first dart lays in the barrel, when dart started the tip takes off,if you blew too strong the tip scrutches the upper wall of the   barrel and dart flys higher.
2. Muzzel velocity: Howerver you blew strongly the pipe the power dwindles down and dart speed fades away, you must blow strong at the moment when the dart reached muzzle.
3. Clearance: Very small clearance between the barrell wall and the dart is necessary.  By big clearance dart  it's diffecult to hit the target accurately.Air leak slower the speed of dart.