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 81 users online :: 5 registered, 0 hidden and 76 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

PVC arrow

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

PVC arrow

Unread postAuthor: POS » Wed Oct 25, 2006 1:59 pm

For those who have a 50 mm barrel, you could make a arrow like this one. It is constructed of PVC. The end works as a flight stabilisator. Inside the endring I 'm gonne construct some PET vins in a twisted way, so in flight, the arrow starts to spin, so the ammo flighs more accurate.

The nose cone os the arrow is constructed out of hard isolating foam, 5 cm (2") thick. I putted a piece on a big screw, and put the srew in a dril, and let it turn slowly (relatively slowly) like a improvices lathe. With a file and sandpaper I then formed the nose cone like it is. The cone is then glued in the pipe with ordinary PVC-glue.

There is a hollow space in it, between the tail and the nose cone. You should put things in it to give it a bir of weight, like forinstance a smoke bomb or so.

You can also put is a pressurized water rocket, so when you shoot it, the pressure releases and gives the rocket extra power and speed. The rocket can be equiped wits a parachute that opens on apogee.

Anyway, her's the rocket or arrow :
  • 0

Attachments
arrow1.jpg
Clear sight on the stabilizer
arrow1.jpg (18.44 KiB) Viewed 1613 times
arrow2.jpg
Sideway of the rocket. good sight of the nosecone and the stabilizor
arrow2.jpg (17.86 KiB) Viewed 1613 times
User avatar
POS
Major
Major
 
Posts: 395
Joined: Thu Sep 14, 2006 4:19 pm
Reputation: 0

Unread postAuthor: Recruit » Wed Oct 25, 2006 3:41 pm

Nice rocket, how accurate is it and does it go far?
  • 0

User avatar
Recruit
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 413
Joined: Fri Oct 06, 2006 4:26 pm
Reputation: 0

Unread postAuthor: POS » Wed Oct 25, 2006 3:52 pm

I 'm gonne test it, hasn't been done for the moment. I 'm going to buy some pressure PVC next month, I have to drive 90 km for that. When I have my gun ready, I let you nof for sure. It is pressty light. According to the GGDT, with a bit of payload, the arrow should fly over 1000 feet.

I dont doubt the fact that it is acurate, since it has a stabiliser and it will spin in midair. I have experience with waterrockets, they are pretty acurate with stabilisers and spinning.
  • 0

User avatar
POS
Major
Major
 
Posts: 395
Joined: Thu Sep 14, 2006 4:19 pm
Reputation: 0

Unread postAuthor: schmanman » Wed Oct 25, 2006 3:54 pm

what size is the pvc? I make my rockets out of aluminum pipe, steel nosecones, and flexible tail fins made from bucket lids.
  • 0

Persistence is a measure of faith in yourself
User avatar
schmanman
Major General
Major General
 
Posts: 1685
Joined: Sat Mar 25, 2006 12:28 pm
Location: Michigan,U.S.A
Country: United States (us)
Reputation: 0

Unread postAuthor: POS » Wed Oct 25, 2006 4:38 pm

post a pic man, I'm curious.

The PVC is 50 mm. But I plan to build a 43 mm barreled pneumatic, so I have to take an other pipe.

What size are your darts ? And what is the use of them ? I make them out of PVC, so they are extra light. The arrow you see up there waighs exacly 100 gram. So room enough for a payload like a smokebomb or something. That should be nice in midair.
  • 0

User avatar
POS
Major
Major
 
Posts: 395
Joined: Thu Sep 14, 2006 4:19 pm
Reputation: 0

Unread postAuthor: schmanman » Wed Oct 25, 2006 8:00 pm

mine are 2-3 feet long, and are used for shooting for distance with my big cannon.
  • 0

Persistence is a measure of faith in yourself
User avatar
schmanman
Major General
Major General
 
Posts: 1685
Joined: Sat Mar 25, 2006 12:28 pm
Location: Michigan,U.S.A
Country: United States (us)
Reputation: 0

Unread postAuthor: Slugfoot » Wed Oct 25, 2006 11:32 pm

Nice one!......but wouldn't spinning it actually de-stabilise it?
  • 0


Slugfoot
Corporal
Corporal
 
Posts: 79
Joined: Sat Oct 21, 2006 4:57 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: weirdwun » Thu Oct 26, 2006 10:23 am

no.....I understand what you're saying, but it does stabilize it.... it's hard to explain. He's talking about spinning on its vertical axis not the horizontal.
  • 0


weirdwun
Private
Private
 
Posts: 14
Joined: Tue Feb 14, 2006 3:05 pm
Reputation: 0

Unread postAuthor: Recruit » Thu Oct 26, 2006 10:48 am

The arrow spins like a top does. That spin is generated by bullets which
is one of several things that stablize them all that is basically is making a
big bullet that will generate this spin better
  • 0

User avatar
Recruit
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 413
Joined: Fri Oct 06, 2006 4:26 pm
Reputation: 0

Unread postAuthor: POS » Thu Oct 26, 2006 2:42 pm

Ok, I'll try to explane what spinning does to the arrow to stabilise it:

The arrow isn't perfectly ballanced in vertical direction I mean. I mean that the left side, the right, the front and backside cant be EXACLY the same. Therefor the arrow will lose track, due to the difference in weight. If left side is a gram heavier that the right side, the arrow wil deviate to the right, cause the extra weight keeps "pushing" the arrow forward, it has more energy (E = MC²) The right side is lighter than the left side, so it slows down faster due to air friction. The result of this is that the arrow turns slowly to the right.

So, when the arow doesn't spin, the arrow will deviate to the right, but due to the spinning, the right becomes the left, back the right, left right ... So the deviation also alters from right to left to right ..... resulting in a straight flight.

Got that ?
  • 0

User avatar
POS
Major
Major
 
Posts: 395
Joined: Thu Sep 14, 2006 4:19 pm
Reputation: 0

Unread postAuthor: boilingleadbath » Thu Oct 26, 2006 4:33 pm

...the formula you are looking for is E=1/2 MV^2.
MC^2 is for a special case (light)
  • 0

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

Unread postAuthor: Hotwired » Thu Oct 26, 2006 4:50 pm

That would be interesting :P

Mass x speed of light^2 = energy of spudgun rocket :D
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
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 ©'