Sniper bullet for airsoft

CDN_Stalker · March 8th, 2009, 23:24

I typed in the google search engine "6.5grains = grams" or something like that and it spat out 0.42g.

aznpos531 · March 9th, 2009, 01:02

1 gram = 15.432358353 grains
6.5 grains = 0.421192915 grams

http://www.unitconversion.org/

FOX_111 · March 9th, 2009, 10:54

The grain science look inconsistent. I saw so many different values...

Turnbull · March 9th, 2009, 15:15

Just stick to the important measurements.... 1lb is 16oz....1oz is 28 grams.... XD

smith · March 9th, 2009, 15:46

Okay, well if you have your muzzle completely horizontal, you're looking at 275FPS for a BB to go 150 ft if your muzzle is 58 inches off the ground.

For basic computations without getting into the complexities of Drag (unless you plan on borrowing the NRC windtunnel to get your drag coefficient), weight doesn't apply, as it's an "external force". Find any online ballistic calculator and put in 5g and compare that to the answer you get with 150g. Same results.

Basically, you're dealing with horizontal velocity, gravitation acceleration, distance and height.

I threw in Fox's BB Gun velocity into my calc and show a distance of 246.62 feet (that's for a horizontal shot with a 58" gun height).

For our purposes, BB weight is mainly going to affect stability and how it punches through foliage.. and how big of a noise it makes when it hits the wall of a CQB house

Here for some math:
http://www.grc.nasa.gov/WWW/K-12/air...ballflght.html

CDN_Stalker · March 9th, 2009, 16:05

Quote:

Originally Posted by smith

........(unless you plan on borrowing the NRC windtunnel to get your drag coefficient).....

You know, I've actually thought about heading over there and setting up a little model of a spinning BB and getting some aerodynamic footage at various air speeds. Maybe someday. Lol

smith · March 9th, 2009, 16:40

Quote:

Originally Posted by CDN_Stalker

You know, I've actually thought about heading over there and setting up a little model of a spinning BB and getting some aerodynamic footage at various air speeds. Maybe someday. Lol

Lemme know when you do that I wanna ride my bike in the windtunnel for some tests

CDN_Stalker · March 9th, 2009, 16:46

Quote:

Originally Posted by smith

Lemme know when you do that I wanna ride my bike in the windtunnel for some tests

Lol, that'd be the 9m windtunnel (we actually have four or five windtunnels, two are at Uplands.) Ya actually, we used to do a lot of NASCAR testing at the 9m one.

mousqueterre · July 4th, 2009, 23:00

Im work on that pass time maybe 6 mouth and is better im make..... On bed whit this ammunition im cover easy 200 ft at 400 fps whit really good precision....

But whit bb and tubular form i think is really better im suprise that do not exist in market.....

If you take tubular bb whit twisted barrel you make really different airsoft....
But airsoft club can accept this special bb ?

Mitchell12 · July 5th, 2009, 04:03

That looks like gum balls and drugs to me.

Con Murder · July 5th, 2009, 18:06

Quote:

Originally Posted by Mitchell12

That looks like gum balls and drugs to me.

Uppers and downers, thats one crazy airsoft game!

G36Maniac · July 5th, 2009, 23:24

Quote:

Originally Posted by smith

Lemme know when you do that I wanna ride my bike in the windtunnel for some tests

For small scale tests, the mythbusters made an homemade windtunnel with a Fan and packs of Straw. Sadly I do not have any link.

colintheguy · July 9th, 2009, 19:32

The most aerodynamic shape is the teardrop. If you implement this is any way I want 15%.

yuhaoyang · July 11th, 2009, 05:39

does a lower drag coefficient mean more stability?
Does it??

kalnaren · July 11th, 2009, 10:21

Quote:

Originally Posted by yuhaoyang

does a lower drag coefficient mean more stability?
Does it??

Yes. There's a reason footballs are teardrop shaped.

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March 8th, 2009, 23:24	#166
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	I typed in the google search engine "6.5grains = grams" or something like that and it spat out 0.42g. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 9th, 2009, 10:54	#168
FOX_111 Le Roi des poissons d'avril Trader rating Join Date: Dec 2003 Location: Terrebonne, Québec	The grain science look inconsistent. I saw so many different values... __________________ Vérificateur d'âge: Terrebonne

March 9th, 2009, 15:15	#169
Turnbull Trader rating Join Date: Aug 2008 Location: Montreal, Quebec	Just stick to the important measurements.... 1lb is 16oz....1oz is 28 grams.... XD __________________ I knew a man once who said "Death smiles at us all. All a man can do is smile back."

March 9th, 2009, 01:02	#167
aznpos531 Trader rating Join Date: Jan 2009 Location: Toronto	1 gram = 15.432358353 grains 6.5 grains = 0.421192915 grams http://www.unitconversion.org/

March 9th, 2009, 15:46	#170
smith Admits to killing Jimmy Hoffa Trader rating Join Date: Apr 2002	Okay, well if you have your muzzle completely horizontal, you're looking at 275FPS for a BB to go 150 ft if your muzzle is 58 inches off the ground. For basic computations without getting into the complexities of Drag (unless you plan on borrowing the NRC windtunnel to get your drag coefficient), weight doesn't apply, as it's an "external force". Find any online ballistic calculator and put in 5g and compare that to the answer you get with 150g. Same results. Basically, you're dealing with horizontal velocity, gravitation acceleration, distance and height. I threw in Fox's BB Gun velocity into my calc and show a distance of 246.62 feet (that's for a horizontal shot with a 58" gun height). For our purposes, BB weight is mainly going to affect stability and how it punches through foliage.. and how big of a noise it makes when it hits the wall of a CQB house Here for some math: http://www.grc.nasa.gov/WWW/K-12/air...ballflght.html

July 4th, 2009, 23:00	#174
mousqueterre Trader rating Join Date: Feb 2009	Im work on that pass time maybe 6 mouth and is better im make..... On bed whit this ammunition im cover easy 200 ft at 400 fps whit really good precision.... But whit bb and tubular form i think is really better im suprise that do not exist in market..... If you take tubular bb whit twisted barrel you make really different airsoft.... But airsoft club can accept this special bb ?

July 9th, 2009, 19:32	#178
colintheguy Trader rating Join Date: Jul 2009 Location: Ottawa	The most aerodynamic shape is the teardrop. If you implement this is any way I want 15%.

Sniper bullet for airsoft

Airsoft Guns Discussion