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Old 02-15-2018, 05:58 PM   #1
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Trajectory question

So I did a search with no results. My echo1 psr has AA, cylinder, 6.03 tb, hop up unit, 150 spring, zero trigger set. It shoots 520fps on my chrono with 25s, I am shooting a target 250ft away ( measured) the target is a piece of aluminum 8 x 14 inches. I can hit it with 45s sometimes 3 hits in arow, however the bb travels pretty straight for probably 200ft then slope upwards but the hit the target where my cross hairs are. If I lessen the hop the bbs fall short, so I am asking if other snipers have this slight rise happening and any ideas on maybe getting a 250ft straight line. I have tried maple leaf autobot and monster buckings, the inner barrel is polished to a mirror finish. Thanks for any help
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Old 02-15-2018, 08:26 PM   #2
1tonne   1tonne is offline
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The curve is quite normal.
I normally have the bb fire slightly downward to start and then go slightly above the cross hair and then drop off.
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Old 02-15-2018, 08:51 PM   #3
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That's what hop ups do... bbs start on a dead center path, then as it slow downs by friction the lift generated by the hop eventually defeats the gravity and the bb goes slightly up, then as speeds go even lower it can't generate enough lift despite the spin and it starts to fall.

This is a (exagerated) demonstration of the typical flight paths:



BBs are not bullets. Don't expect a totally straight trajectory (or a parabolic ballistic trajectory), cause you'll simply never get that.
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Last edited by Dimitri MdP; 02-15-2018 at 08:54 PM.
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Old 02-16-2018, 06:36 AM   #4
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Thank you both for the replies, I figured that I had the right amount of hop, but needed to check with more experienced snipers
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Old 02-16-2018, 06:59 AM   #5
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I find the slight hop quite satisfying.
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