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Discussion Starter · #1 · (Edited)
I know a few of us have seen this document, but I know a lot of others have not. This is basically a big research project done (by someone else, not myself) to describe the physics of an airsoft BB. Almost anything you want to know about a BB being shot will be in this link: http://mackila.com/airsoft/atp/

Content:
I. Physics Principles and Equations

A. Physical Characteristics of BB's, Pellets, Paintballs, Etc.

1. Diameter

2. Volume / Density and Terminal Velocity

B. Air Density

C. Kinetic Energy

D. Forces Governing Trajectory

1. Drag Force

2. Velocity

3. Distance

4. Magnus Force

5. Terminal Velocity

6. Spin Decay

7. Drag Coefficient

8. Lift Coefficient

9. Gravity

II. Testing and Model Validation

A. Verifying Velocity Calculations

III. Effects of Hop-Up

IV. Effective and Maximum Range for 6mm BB's

A. Definitions of Effective and Maximum Range

B. Effective Range and Recommended BB Weight

C. Effective Range Observations

V. Environmental Effects

A. Effect of Wind on Trajectory

1. Headwind / Tailwind Component

2. Crosswind Component

B. Effect of Altitude on Trajectory

C. Effect of Temperature on Trajectory

VI. Minimum Engagement Distance

A. Determining Muzzle Energy

B. Safe Impact Energy

C. Recommended Universal MED's

VII. Modeled Data

A. Velocity Comparisons Using BB's of Equal Masses

1. Velocity Comparison Using 0.20 Gram BB's

2. Velocity Comparison Using 0.25 Gram BB's

3. Velocity Comparison Using 0.28 Gram BB's

4. Velocity Comparison Using 0.29 Gram BB's

5. Velocity Comparison Using 0.30 Gram BB's

6. Velocity Comparison Using 0.36 Gram BB's

7. Velocity Comparison Using 0.43 Gram BB's

8. Velocity Comparison Using 0.88 Gram BB's

9. Velocity Comparison Using 0.34 Gram 8mm BB's

10. Velocity Comparison Using 0.45 Gram 8mm BB's

B. Mass Comparisons of Projectiles Fired at Equal Energies

1. Effects of Different BB Masses Fired at 0.37 Joules (200 fps Using 0.20g)

2. Effects of Different BB Masses Fired at 0.47 Joules (225 fps Using 0.20g)

3. Effects of Different BB Masses Fired at 0.58 Joules (250 fps Using 0.20g)

4. Effects of Different BB Masses Fired at 0.70 Joules (275 fps Using 0.20g)

5. Effects of Different BB Masses Fired at 0.84 Joules (300 fps Using 0.20g)

6. Effects of Different BB Masses Fired at 0.98 Joules (325 fps Using 0.20g)

7. Effects of Different BB Masses Fired at 1.14 Joules (350 fps Using 0.20g)

8. Effects of Different BB Masses Fired at 1.49 Joules (400 fps Using 0.20g)

9. Effects of Different BB Masses Fired at 1.88 Joules (450 fps Using 0.20g)

10. Effects of Different BB Masses Fired at 2.32 Joules (500 fps Using 0.20g)

11. Effects of Different BB Masses Fired at 2.81 Joules (550 fps Using 0.20g)

12. Effects of Different BB Masses Fired at 3.35 Joules (600 fps Using 0.20g)

13. Effects of Different BB Masses Fired at 3.93 Joules (650 fps Using 0.20g)

14. Effects of Different BB Masses Fired at 4.55 Joules (700 fps Using 0.20g)


VIII. Closing Remarks

IX. References

X. Online Calculators

A. MilDot Scope Calculator

B. Relative Energy / Minimum Engagement Distance Calculator

 

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thanks for postin it :)
 

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Unforgiving, read the thread carefully. You will see he says he didn't.
 

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Discussion Starter · #10 · (Edited)
Sorry to be the bearer of bad news, but this info has already been posted... and stickied. http://airsoftsniperforum.com/showthread.php?t=1684

Although he did not organize it like this.
I actually knew that it was stickied somewhere else so I never intended this to get stickied haha >:D. It would be nice though if this did get stickied for easier access. I wouldn't mind if I receive no credit or even get a slap on the wrist! I believe information like this should be shared in plain sight :tup:.

The original link to that website (in these forums) is VERY obscure. The title of that thread hides the fact that it contains a link with a lot of useful information about BB behavior. Even some of the more experienced and long-time users at this forum had no idea! :lmao:

I believe Mojo posted it first and his intention was for people to see the link so I'm simply helping him out in a sense :)
 
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