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GBB hopup adjustment confusion

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Old July 18th, 2010, 21:02   #1
wind953
 
Join Date: Feb 2009
Location: Vancouver, BC
GBB hopup adjustment confusion

I currently have a TM desert eagle hard kick, and I found that even with the hop up off, the BB still curves upwards over a distance (~20-30 feet). For a target like a pop can, I have to do a very solid 6 o'clock hold (have I got this definition correct?) to be able to hit the can in the middle. I've had similar issues with some other GBBs before. Hop up needs to be adjusted way down, and even then I have to aim a bit lower than the target point.
Could this be because I am testing from an elevated position (second floor)? The slanted angle causes the BB to be pulled towards the ground differently than when the BB is going straight (I'm no physicist...ops?
It seems even if I am at the same level as the target and shooting straight out, the increased hop up I'd have to do would be tiny. I mean it's fine if I have a way to shoot straight every time, but it just seems odd that I'd only be using less than a fifth of a turn on the dial to get the gun to shoot accurately.
Anybody that's mastered the art of hop-up adjusting have any suggestions?
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Old July 18th, 2010, 21:11   #2
Amos
 
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what BB's are you using?
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Old July 18th, 2010, 22:24   #3
wind953
 
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MadBull's 0.30g
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Old July 19th, 2010, 23:49   #4
wind953
 
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bump~
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Old July 20th, 2010, 01:58   #5
Wrath144
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The hop-up pulls the BB towards the top of the gun, no matter what angle. If you're shooting downhill the hop-up is going to pull the BB laterally [forward, relative to you], rather than vertically [relative to the ground]. This gives the illusion of the BB's over-hopping. Bottom line, when shooting downhill, aim low.
If you're shooting flat and it still over-hops, check your rubber for tears or wear. If it seems alright, wash it with warm water, clean your barrel and put it all back in and see if that helps.
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Old July 20th, 2010, 02:17   #6
wind953
 
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Location: Vancouver, BC
Thanks for the clarification on the downhill shooting! Is the reverse true for uphill shooting?
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Old July 20th, 2010, 02:20   #7
wind953
 
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Quote:
Originally Posted by wind953 View Post
Thanks for the clarification on the downhill shooting! Is the reverse true for uphill shooting?
Oops nevermind. I guess you'd still have to aim low for uphill, since the hopup would still carry the BB upwards and end up going above the target.
Thanks for the help!
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Old July 20th, 2010, 12:49   #8
ILLusion
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Hop up is there to combat the forces of gravity pulling perpendicular to the flight path. If you're shooting straight down, you're shooting in the same direction as gravitational force, and thus, hop up will pull the BB perpendicular to the shot vector. With no gravitational force to keep the BB down, the projectile will not fly straight, when you are shooting downwards towards the ground.

In this scenario, you should consider a non-hop up system.
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