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What brand BBs are best nowadays? Bang for buck.

Sewdhull said:
The time to target for the same energy is marginally slower at first and by the time you can notice a difference the heavier bb is quicker.

This is the main reason they travel further, higher average speed.

This is because of physics.



From the airsoft trajectory project.
Click to expand...


The physics behind it is fairly simple, Heavier BB's conserve their energy better.

Assume you have a Mini cooper going 100mph and a Truck going 60 down an infinite straight road, If you just let both of them go - no accel no braking - the mini stops LONG before the Truck, even in spite of the speed advantage, because the Truck is way heavier. Same principle for BBs, Light 'mini' BB may be faster at first, but that Heavy 'Truck' BB is still gonna be at a solid 30-20mph by the time that mini stops. 
(This is an Analogy, i dont actually know how accurate my waffle about Trucks and Minis is here)

 
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It’s called the momentum of mass. It is calculated as

p = m*v (m is the mass and v the velocity).

A 0.2 Gramm BB shot at 1 J will travel at about 100m/s. A 0.3gramm BB will travel at about 85m/s. 

0.2 BB -> 0.2g*100m/s = 20 m*g/s

0.3 BB -> 0.3g*85m/s = 25.5 m*g/s

 
Have a stockpile of G&G 0.28g which I plan on using for support gun in the future. Have also used Azimuth BBs, with good results.  Although they seem to be a thing of the past.  Have a few bags of Bushido which I plan on using at some stage this year.  

Also have a few bags of Geoffs 0.32g. Will eventually find something to feed them to. Unfortunately some magazines don't feed reliably with heavier BBs. Okay if you can use PTS midcaps, less so if it's a unicorn gun. 

 
ParHunter said:
It’s called the momentum of mass. It is calculated as

p = m*v (m is the mass and v the velocity).

A 0.2 Gramm BB shot at 1 J will travel at about 100m/s. A 0.3gramm BB will travel at about 85m/s. 

0.2 BB -> 0.2g*100m/s = 20 m*g/s

0.3 BB -> 0.3g*85m/s = 25.5 m*g/s
Click to expand...
It's not about momentum. It's energy. As you can see above they aren't the same.

0.2BB at 100m/s drag is X Newtons.

0.3BB at 85m/s drag is .72X N.

FDrag prop to v²

.2 v² is 10000

.3 v² is 7225 or .72 of 10000.

Drag (force) is directly proportional to the square of the speed, other variables are the same.

0.2BB acceleration is -Y ms²

0.3BB acceleration is -.48Y ms²

a prop to F

a prop to 1/m

.3BB has .72 of the FDrag of the .2

.3BB has 1.5 of the mass of the .2

.72/1.5 = .48 of the acceleration of the .2, a deceleration in this case.

Acceleration is directly proportional to the force on the BB (less on the .3), and inversely proportional to mass (more on the .3).

You can see that the decceleration is less than half for a .3 at the same energy than the .2 .

The .2 will slow to match the .3 velocity but even thenen the .3 will lose velocity slower because of its 1.5 times more mass.

Only when the FDrag on the .3 is 1.5 times the drag on the .2, about 1.25 times faster than the .2 will they deccelerate at the same rate.

I think :)

 
Sewdhull said:
It's not about momentum. It's energy. As you can see above they aren't the same.

0.2BB at 100m/s drag is X Newtons.

0.3BB at 85m/s drag is .72X N.

FDrag prop to v²

.2 v² is 10000

.3 v² is 7225 or .72 of 10000.

Drag (force) is directly proportional to the square of the speed, other variables are the same.

0.2BB acceleration is -Y ms²

0.3BB acceleration is -.48Y ms²

a prop to F

a prop to 1/m

.3BB has .72 of the FDrag of the .2

.3BB has 1.5 of the mass of the .2

.72/1.5 = .48 of the acceleration of the .2, a deceleration in this case.

Acceleration is directly proportional to the force on the BB (less on the .3), and inversely proportional to mass (more on the .3).

You can see that the decceleration is less than half for a .3 at the same energy than the .2 .

The .2 will slow to match the .3 velocity but even thenen the .3 will lose velocity slower because of its 1.5 times more mass.

Only when the FDrag on the .3 is 1.5 times the drag on the .2, about 1.25 times faster than the .2 will they deccelerate at the same rate.

I think :)
Click to expand...




It IS about momentum.

AND energy and wind resistance and air density and temperature, atmospheric pressure, aerodynamics and gravity.

 
if your gun is travelling at 300 FPS, and your BB shoots 300 FPS, your BB will still be travelling at 300 FPS, because the speed of BB is constant regardless of frame of reference according to relativistic physics, it may look faster but it is experiencing time differently because of time dilation via Magnus effect applied by the hop up

 
Looking at proportionality, common values can be ignored if the proportionality is unaffected, so only changes need to be considered.

Air density etc can be ignored.

Only if you need a numerical result would you need to run through the calculations with values.

Pseudotectonic said:
if your gun is travelling at 300 FPS, and your BB shoots 300 FPS, your BB will still be travelling at 300 FPS, because the speed of BB is constant regardless of frame of reference according to relativistic physics, it may look faster but it is experiencing time differently because of time dilation via Magnus effect applied by the hop up
Click to expand...
Dear me

 
All this technical stuff is giving me a headache, let me share my wisdom,

Beef Sausage... 4kg lean beef, 1kg bread rusk, 210g seasoning(special recipe), 3kg cold water. Mince beef through a medium plate, add dry ingredients & mix thoroughly, add water & mix again, mince a second time then fill into skins, link evenly & sell the buggers.

any one disagree?

 
Last edited by a moderator:
gavinkempsell said:
All this technical stuff is giving me a headache, let me share my wisdom,

Beef Sausage... 4kg lean beef, 1kg bread rusk, 210g seasoning(special recipe), 3kg cold water. Mince beef through a medium plate, add dry ingredients & mix thoroughly, add water & mix again, mince a second time then fill into skins, link evenly & sell the buggers.

any one disagree?
Click to expand...
Me, but only because I do not eat meat.

 
Best and most consistent.28s I’ve used (I am sad and check my bb weight quite often with 4 dp digital microscales) are BAW brand, come in bags called Baw bags - lol

https://www.airsoftworld.net/catalogsearch/result/?q=Baw

more recently a couple of top Uk techs, (including Kingdom of Airsoft) who have done some extensive testing have surprisingly recommended Nuprol RZR, having bought a couple of different weights - they are remarkable good clean consistent bbs

 
Cannonfodder said:
You clearly, and fortunately, haven't committed to the meat free cause. You've been here almost a year and a half before mentioning it ?
Click to expand...
I have been here a lot longer than that; my previous account was hacked.  I don't really see why people feel the need to mention being vegetarian or vegan or whatever all the time.

 
Last edited by a moderator:
Pseudotectonic said:
if your gun is travelling at 300 FPS, and your BB shoots 300 FPS, your BB will still be travelling at 300 FPS, because the speed of BB is constant regardless of frame of reference according to relativistic physics, it may look faster but it is experiencing time differently because of time dilation via Magnus effect applied by the hop up
Click to expand...


What if it's on a treadmill?

 
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