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 55 users online :: 5 registered, 0 hidden and 50 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

projectile velocity guesses

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

projectile velocity guesses

Unread postAuthor: rp181 » Tue Mar 17, 2009 6:50 pm

Hey all. I fired the railgun again, it was the best shot yet. Can anyone guess the velocity of it? It put a hole in .02" steel plate. The projectile is .5"x.5"x1" aluminum.

Very last shot on:
http://www.youtube.com/watch?v=C6cV10QE ... annel_page
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Unread postAuthor: psycix » Wed Mar 18, 2009 3:46 pm

Awesome sparks!
Too bad there was music over the sound of it...
I have absolutely no idea of the muzzle velocity of this thing. What is it?
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: Biopyro » Wed Mar 18, 2009 4:31 pm

You can make a rough estimate by measuring the distance the projectile is traveling fo and then finding out how many video frames it appears in. If you know the framerate you can do it fairly well

10m, appears in 2 frames at 30fps so it took 2/30 s to travel 10m 10/0.666=150 so it was around 150m/s.

You could also use a microphone to measure the time between the firing sound and the sound of it hitting the target.

http://www.spudfiles.com/forums/viewtopic.php?p=66156%F0%90%89%AC
  • 0

Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -Benjamin Franklin
User avatar
Biopyro
Colonel
Colonel
 
Posts: 656
Joined: Fri Aug 04, 2006 5:32 am
Location: UK
Reputation: 0

Unread postAuthor: jimmy101 » Thu Mar 19, 2009 2:07 pm

Biopyro wrote:You could also use a microphone to measure the time between the firing sound and the sound of it hitting the target.

Or, just extract the audio track from the video, assuming the video has an audio track.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3129
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: rp181 » Thu Mar 19, 2009 2:57 pm

I tried that. The quality sucks too much. On the plus side, I may be getting access to a phantom 5.1 high speed camera.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'