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 52 users online :: 4 registered, 0 hidden and 48 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Speed Record

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

Speed Record

Unread postAuthor: cannon freak » Sun Jun 25, 2006 1:24 pm

Could someone tell me what the highest speed any one has been able to shoot something.. By using some form of potato cannon wheather it be combustion, pnuematic, or a hybrid, Im guessing its a hybrid has the highest speed.

Any way I want to kow this beceause its going to be my summer project to build a sort of mini but not a huge hybird and I want to be able to break the record, it may or may not happen.

I also know that most people do not own a chronograph. But most people don't build guns that go mach 1
  • 0


cannon freak
1st Lieutenant
1st Lieutenant
 
Posts: 272
Joined: Fri May 12, 2006 8:37 pm
Location: New Brunswick, Canada
Reputation: 0

Unread postAuthor: CpTn_lAw » Sun Jun 25, 2006 1:30 pm

Joel from spudtech beat the sound barrier...with a pneumatic. i broke the sound barrier too, with my mini penumatic from galvanized steel, and i shot a 6mm BB at 391 m/s. (barrel was perfect fit and a lentgh of 1m)
  • 0

User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: benstern » Sun Jun 25, 2006 2:01 pm

My pneumatic DOBA launcher when finished and equipted with a GB barrel can shoot golf balls at 2059 feet per second while the spped of sound would be 1162.875 feet per second

however if the barrel is increased to 370 inches the speed would be over mach 2! 2344 ft/s!!!
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Unread postAuthor: noname » Sun Jun 25, 2006 2:30 pm

That's just crazy. That's means you would get a mile in 2 seconds. Jesus I'm glad I don't live near you.
  • 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: cannon freak » Sun Jun 25, 2006 2:34 pm

Benstern are you planning on using helium or another gas in your gun? Beceause if you just used normal air it could not go mach 1. I learned of this little fact in one of my first post when I was wondering how to go supersonic. Its just not possible for air to move a projectile that fast.

Now if you are using another gas than it is could be possible

So are you using helium?
  • 0


cannon freak
1st Lieutenant
1st Lieutenant
 
Posts: 272
Joined: Fri May 12, 2006 8:37 pm
Location: New Brunswick, Canada
Reputation: 0

Unread postAuthor: Velocity » Sun Jun 25, 2006 3:06 pm

noname wrote:That's just crazy. That's means you would get a mile in 2 seconds. Jesus I'm glad I don't live near you.

not necessarily. That is just muzzle velocity. It will definitly slow down a very significant amount as soon as it leaves the barrel. But yeah, it would go far.

Benstern, how exactly are you planning on making a golf ball go that fast?
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: benstern » Sun Jun 25, 2006 3:47 pm

No actually I will use Hydrogen. It is the ultimate gas for pneumatics.
How to make it go fast: build a big launcher!!!
http://rapidshare.de/files/24109775/sup ... l.gdt.html
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: cannon freak » Sun Jun 25, 2006 4:21 pm

Holy crap man thats going to take forever to fill up, unless you are buying the gas. Again, holy crap you better be carfull with that fuel even if the hydrogen can not react with oxygen in the tank, if there is a leak and an ignition sourcs then bye bye launcher.
  • 0


cannon freak
1st Lieutenant
1st Lieutenant
 
Posts: 272
Joined: Fri May 12, 2006 8:37 pm
Location: New Brunswick, Canada
Reputation: 0

Unread postAuthor: crcowboyfan » Sun Jun 25, 2006 5:48 pm

How do i open the .gdt file?
  • 0


crcowboyfan
Private First Class
Private First Class
 
Posts: 31
Joined: Wed Feb 22, 2006 8:15 pm
Reputation: 0

Unread postAuthor: benstern » Sun Jun 25, 2006 6:13 pm

save to disk, then open it with GGDT.
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Re: Speed Record

Unread postAuthor: frogy » Sun Jun 25, 2006 7:17 pm

cannon freak wrote:Could someone tell me what the highest speed any one has been able to shoot something.. By using some form of potato cannon wheather it be combustion, pnuematic, or a hybrid, Im guessing its a hybrid has the highest speed.

Any way I want to kow this beceause its going to be my summer project to build a sort of mini but not a huge hybird and I want to be able to break the record, it may or may not happen.

I also know that most people do not own a chronograph. But most people don't build guns that go mach 1


Joel of http://www.SpudTech.com shot a potato over Mach 1 with one of his guns, he had to be over 1000 fps if he shot from his house according to a Speed\Mach calculator....
  • 0

-FrOgY-

I wish people would stop needing a better signature!
User avatar
frogy
Colonel
Colonel
 
Posts: 603
Joined: Mon May 29, 2006 1:24 pm
Location: Ohio
Reputation: 0

Unread postAuthor: boilingleadbath » Mon Jun 26, 2006 2:50 pm

Many acctualy doubt he got supersonic velocities. It's a fairly short launcher that supposedly fired a reasonably massed projectile using pressurized air.

Any 2 of those in conjunction make it almost impossible to get such velocities, and the GGDT doesn't coincide with his claim at all.
  • 0

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

Unread postAuthor: benstern » Mon Jun 26, 2006 6:59 pm

had to be over 1000 fps if he shot from his house according to a Speed\Mach calculator....


You do know that the speed of sound in air is dependent on temperature not altitude?

In theory if I fired a 0.5 gram projectile 2.25" in diameter from my DOBA launcher equipped with a 80" barrel it could attain a speed of 8974 feet per second.

"WTF would weigh 0.5 grams and be 2.25" in diameter" you ask?
Why an aerogel does!

Aerogels are composed of 90-99.8% air with typical densities of 3-150 mg/cm3.
from http://en.wikipedia.org/wiki/Aerogel

EDIT: that would be mach 7.717 at 100 degrees fahrenheit
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Unread postAuthor: frogy » Mon Jun 26, 2006 9:59 pm

Well in Appleton, Wisconsin with about a 150 gram potato 2", with a Supah Valve and a big ass air chamber to 100+ psi hydrogen, he could break it easily...

Even with helium or compressed air... What are you talking about relatively small? The chambers like 8 ft of 5" from the looks of it, and the barrel looks like 15' of 2"
  • 0

-FrOgY-

I wish people would stop needing a better signature!
User avatar
frogy
Colonel
Colonel
 
Posts: 603
Joined: Mon May 29, 2006 1:24 pm
Location: Ohio
Reputation: 0

Unread postAuthor: benstern » Mon Jun 26, 2006 10:20 pm

Actually three 3" five foot long SCH-80 pipes for chambers. Only 100 pounds :twisted:
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Next

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'