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 60 users online :: 3 registered, 0 hidden and 57 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

unstabilised projectiles

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

unstabilised projectiles

Unread postAuthor: jackssmirkingrevenge » Wed Dec 09, 2009 1:05 am

[youtube]http://www.youtube.com/watch?v=Num9TR7wlrw[/youtube]

Just a point about projectiles without gyroscopic/drag stabilisation, they start to tumble almost immediately after leaving the muzzle. Not a groundbreaking revelation, I'll grant you, but seeing it in slow motion does hammer the point home ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: POLAND_SPUD » Wed Dec 09, 2009 2:54 am

I think you've posted it before... anyway it's worth seeing again

I've downloaded rocksim again.. not that I am interested in rocketery but I am curious if it's stability and cd predictions are right
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: jackssmirkingrevenge » Wed Dec 09, 2009 3:09 am

I don't think I had posted this particular one, I've certainly wanted to refer to it in the past and hadn't found it.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: dewey-1 » Wed Dec 09, 2009 9:19 am

POLAND_SPUD wrote:I think you've posted it before... anyway it's worth seeing again

I've downloaded rocksim again.. not that I am interested in rocketery but I am curious if it's stability and cd predictions are right


Here are some other useful calculators for CP location of rockets/projectiles and other model rocket calculations.

http://my.execpc.com/~culp/rockets/Barrowman.html


http://www.mrhq.org/software/freeshar/freeshar.shtml
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: POLAND_SPUD » Wed Dec 09, 2009 9:47 am

thx, rocksim can use barrowman stability equations

I am really interested if it's cd predictions are accurate... it's not that hard to design a drag stabilised rocket with a cd value of 0.2 or less so that could be used to design long range projectiles for spudguns
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'