Sniper bullet for airsoft

[Jaxxin]

the link didnt work for me,

that being said i think its pretty obvious those rap4s are horrible!

i read on an airsoft sniper forum that when you shoot over like 300fps they lose there flight stability and tumble.

still worried about flight distance on these APs.
Anyone care to drop science on me? As of now i fullheartedly believe range (or lack there of) will kill this product. I imagine we have enough to come up with atleast a rough estimation.


bb weight: .18
fps: 450

what angle would the muzzle be to the ground to get lets say 150 foot range?

If i actually payed attention in physics i would know how to calculate this!

[Jaxxin]

Originally Posted by Sha Do

The difference with these is that there are no "fins", and the indents that circle the circumferance of the shaft will generate lift, but at what cost to the FPS?? I'm still waiting to see what "at range" ballistic readings will be with the gun equivantly set up to crony 0.20 weight BBs.
I haven't given up hope on this just yet.

SHA DO

forgive my unscientific noobness, but how does an indent on all sides cause lift. if its on all sides, it would be producing the same force down, as up, nullifying the 'lift'... unless its antigravity!

[aznpos531]

haha those finned bb's looked like a bag full of mini-holy grenades from worms =P

[Jaxxin]

Originally Posted by aznpos531

haha those finned bb's looked like a bag full of mini-holy grenades from worms =P

hhahah yeah they do. God i miss that game

[aznpos531]

hehe that was a good game...it really amazed me and frustrated me when the computer would get these impossible shots!!

but seriously...no more updates on these sniper boobies...i mean, bb's?

[tunabreath]

What do you mean was? I still play WWP regularly with my friends

Anyways, yeah, nothing new so far. His forum is back up though:
http://tr.hsairsoft.com/viewtopic.php?lang=en&f=7&t=3

[arcanuck]

Originally Posted by Jaxxin

forgive my unscientific noobness, but how does an indent on all sides cause lift. if its on all sides, it would be producing the same force down, as up, nullifying the 'lift'... unless its antigravity!

Yes, any outward forces that could be generated will be axial and in actuality provide no lift. The ridges will effectively and exponentially create turbulence and drag, thus slowing the projectile. I have a concern of the projectile tumbling at long range while decelerating but that may not be that case; that may have been factored into it's design.

[CDN_Stalker]

I still can't see it working very well for longer range shots, lift and drag factored in, as far as the aerodynamics goes, ridged boat tail spun via rifling vs. a heavy BB with a backspin. The light weight will be prone to air currents regardless of the design, and the low velocities the 'bullet' will be shot.......... be lucky to get a decent 150ft out of it on a man sized target. There will be no lift generated, but there will be some drag reduction based upon the boat tail, but anything shot out of an airsoft gun, regardless of the velocity, will lose velocity very quickly in a short distance.

[FOX_111]

I see a good application for them, and that would be in wooded area where a nice ballistic, stable curve is desirable to shoot in between brushs.

If it can reach 150fts, it will be more than plenty. And the light weight the prototype are, would allow more fps and still be safe.

[CDN_Stalker]

Originally Posted by FOX_111

I see a good application for them, and that would be in wooded area where a nice ballistic, stable curve is desirable to shoot in between brushs.

If it can reach 150fts, it will be more than plenty. And the light weight the prototype are, would allow more fps and still be safe.

Problem is, in the woods is where the air currents are most unstable, so a lightweight BB such as the 0.18g or whatever they are.............. would likely be very unusable unless indoors at ranges less than 100ft and only with a lower powered sniper rifle. Higher fps will cause BBs and those things to become more unstable, as has been proven by my tests (with BBs, not those). I can't really see a use for them unless they are made heavier, and the ballistic coefficient must be brutal with that length vs. weight. Add in only breech loading gas powered guns being able to use them single shot.......... ugh.

[FOX_111]

Since they don't spin like a BB and are more like a bullet, higher fps will give them more lateral spin and they will behave more like a real bullet.

Like a pellet gun, I assume they will be acurate like one.

I wonder how the wind will effect them, more likely more than a normal BB.

Only test will say definatly.

What's the weight of a .177 lead pellet?

[Kimbo]

Originally Posted by FOX_111

What's the weight of a .177 lead pellet?

depends on manufacturer, between 5-10 grains.

I wonder if you used a tanio koba twist barrel if you could impart some rifling sping on this projectile?

I agree that in my mind these should be heavier, but not seeing them yet, it may be short sighted on my part.

[FOX_111]

5-10 grains... that's about .18g to .20g I think.

My pellet rifle that shoot about 450fps with .117 pellet have a usable range of about 250fts.

That does not make any sense... But that's what was on the chrony.

Anyway, I can shoot small birds at that distance pretty consistently.

[CDN_Stalker]

A lead pellet actually sits around what a 0.43g BB will be at, so rethink it all. This type of BB will behave like a short Q-tip at higher velocities with that weight used.

6.5 grains = 0.421192915 grams

[FOX_111]

1gramme=14,43236grains
right?
I had other data on other websites..