Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 72 users online :: 5 registered, 0 hidden and 67 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Pocket Vortex (Football)

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

Pocket Vortex (Football)

Unread postAuthor: Mishkan » Thu Aug 09, 2007 11:58 am

Anyone know the drag coefficient or close to it of a pocket vortex right off hand?
  • 0

Last edited by Mishkan on Thu Aug 09, 2007 1:16 pm, edited 1 time in total.

Mishkan
Corporal
Corporal
 
Posts: 63
Joined: Tue Jul 17, 2007 11:31 pm
Reputation: 0

Unread postAuthor: noname » Thu Aug 09, 2007 12:00 pm

The Pocket Vortex was a gun, and it wouldn't have a drag coefficient unless you were planning on using it as ammo.
Maybe I'm a dumbass, that's probably it. When I saw Pocket Vortex I thought you were talking about the strafer, not those little nerf footballs.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: Mishkan » Thu Aug 09, 2007 1:16 pm

Talking about the footballs :wink:
  • 0


Mishkan
Corporal
Corporal
 
Posts: 63
Joined: Tue Jul 17, 2007 11:31 pm
Reputation: 0

Unread postAuthor: boilingleadbath » Thu Aug 09, 2007 5:58 pm

"Low".
I don't know of any wind tunnel tests involving vortex football-things, but I have seen a test that pegged a football at a Cd of about .22, in the turbulent regime (our situation).

Add a bit of drag to account for the fins, and we might consider a Cd of .25 - .3

On the other hand, I've seen far lower amounts of drag reported for a football shape... I think as low as .15.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'