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 85 users online :: 4 registered, 0 hidden and 81 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Amazed at performance of my new potato gun. Read this.

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

Amazed at performance of my new potato gun. Read this.

Unread postAuthor: Johnny Blast » Sun Jul 09, 2006 12:13 pm

My new gun has a cylinder (pvc of course) 2 feet long and 4 inches in diameter for the combustion chamber. I have a 2 inch diameter barrell that is six feet long. Total length probably 8.5 feet.

Remember wiffle balls with holes made of light weight plastic? If you put a spin on them when you threw them they would curve easily.

Now: I've shot some potatoes which spun so fast that they actually curved like a wiffle ball when shot straight up into the air. The height was unbelievable. It was scary regarding how much height was reached. I used Suave hairspray which is fantastic and a lantern lighter igniter.

Have a great day people. Just a story for you.
  • 0


Johnny Blast
Private
Private
 
Posts: 17
Joined: Mon Jul 03, 2006 4:50 pm
Reputation: 0

Unread postAuthor: WOW!! » Sun Jul 09, 2006 12:30 pm

Have any pics of it??
  • 0

(\__/)
(O.o)
(> <)
This is Bunny. Copy Bunny into your signature to help him on his way to world domination.

My girl friend says I dont listen, at least thats what I think she said...
User avatar
WOW!!
Brigadier General
Brigadier General
 
Posts: 889
Joined: Thu Mar 16, 2006 9:47 pm
Location: New jersey
Reputation: 0

Unread postAuthor: Johnny Blast » Sun Jul 09, 2006 12:38 pm

I don't have any pictures yet. I don't think I'll be using the gun too much because of the saftey issue: "Where is it going to land"?
  • 0


Johnny Blast
Private
Private
 
Posts: 17
Joined: Mon Jul 03, 2006 4:50 pm
Reputation: 0

Unread postAuthor: benstern » Sun Jul 09, 2006 1:00 pm

Preformance can not be it's best unless you use metered propane and a spark strip.
  • 0

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

Unread postAuthor: SpudStuff » Sun Jul 09, 2006 1:03 pm

im sure there are instances where by chance you can get the exact amount of fuel with arosol
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: huse_spud » Sun Jul 09, 2006 1:09 pm

Johnny Blast wrote:I don't have any pictures yet. I don't think I'll be using the gun too much because of the saftey issue: "Where is it going to land"?


this sounds like your first or second spudgun, trust me, the explosiveness of combustions makes them seem pretty powerful, but yours prolly isn't that good compared to people who have been doing this for awhile. i was impressed with my first combustion cannon too because i had never been exposed to any other types of spud guns.

that was a little more than 4 months ago and ive built far better cannons since then. (pnuematics)
  • 0

User avatar
huse_spud
1st Lieutenant
1st Lieutenant
 
Posts: 269
Joined: Sat Apr 15, 2006 6:52 pm
Location: Center Junction, IA
Reputation: 0

Unread postAuthor: boilingleadbath » Sun Jul 09, 2006 3:18 pm

To be kind, I went and plugged some data into EVBEC:

You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.

If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.
  • 0

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

Sponsored

Sponsor
 


Unread postAuthor: Johnny Blast » Sun Jul 09, 2006 5:49 pm

--------------------------------------------------------------------------------
To be kind, I went and plugged some data into EVBEC:

You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.

If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.

You are very kind. And yes this is only my second gun I have made, to answer a previous post. You guys are good and I had no idea that it's possible to delve into this subject so scientifically and in such detail.
  • 0


Johnny Blast
Private
Private
 
Posts: 17
Joined: Mon Jul 03, 2006 4:50 pm
Reputation: 0

Unread postAuthor: Mihlrad » Sun Jul 09, 2006 8:23 pm

all in good physics and chemistry, i hate both subjects but they help... Get some pictures up i still wanna see it.
  • 0

User avatar
Mihlrad
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 467
Joined: Tue May 23, 2006 6:45 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'