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No Spare Parts; BV launcher

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 10, 2012 6:55 pm

kydavies wrote:the end of the projectile can not be flat because the fishing line has to be attached to the back... Cut the PVC on a shallow angle?


peecture?
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Unread postAuthor: kydavies » Tue Apr 10, 2012 10:16 pm

I had another Idea as well, a 2 part projectile that would "split" in half upon impact with the water. but here's what i meant earlier. You need a place to attach the line to the projectile and that place has to be at the back (for stability's sake.
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projectile mkII.png
my second idea, the 2 part "missile". the two halves should separate upon impact with the water due to the increased drag (only if it smoothly enters the water in such a way that the force exerted upon the tip of the projectile is minimal with no super cavitation)
projectile mkII.png (18.86 KiB) Viewed 208 times
mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 10, 2012 11:51 pm

My concern would be that it would split up in flight. Also, do you actually want to use this for fishing? My original suggestion was to provide a more reliable and "permanent" marker for range as opposed to looking for a spash :)
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Unread postAuthor: kydavies » Wed Apr 11, 2012 12:21 am

If built properly it should stay in tact until it hits the water. Our local lake has a very shallow gradient so it is very difficult to fish from shore so "casting" 100-150m would save me the couple hundred bucks I would have to spend to get a canoe.
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 11, 2012 1:05 am

kydavies wrote:If built properly it should stay intact until it hits the water.


I would say the drag from the main line would pull it apart in flight.

Since you need it to be low velocity in order not to tear the line but still reach far, it might be worth the time and effort to make an aerodynamic and high density finned saboted body.
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Unread postAuthor: kydavies » Wed Apr 11, 2012 1:22 am

I plan to put a 40lbs test leader to absorb the "snapping" of the line as it pulls taught so I should be able to fire it at a decent velocity (for my launcher). Also I want to to fit inside of 1/2" sdr 21 because I like the challenge. I'm thinking if I'm careful and go with the 2nd design I Can connect the main line to the front half of the body and run it through a guide on the tail
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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