My rope launcher (pneumatic)

At this point I think it’s beyond me financially. Lol Plus they use odd shaped projectiles. I’ve seen square and I beam shaped ones. That’s so good for Moving about in the tree. Yes I’ve seen the YouTube videos as well. Pretty cool project if you can get enough raw amperage and volts.

But I never say never!
 
I’ll stick with doing these for the time being.

3D printed throw weights

You don’t need a lot of air to get significant drag. Just stick your hand out the car window when driving just 40 mph. Plenty of drag then. True, but ballistic coefficiency will pale in importance when compared to the other forces, like the throw line, and your only going to cover 100 or so...
www.treebuzz.com
 
Whisper said:
My last robotics project was a 350lb lawn bot. It sports a with wheel barrow on top which empty’s with a 250lb linear actuator. 5mph top speed two 950nm wireless ir cameras and luminator. GPS waypoints. I was hoping to add LiDAR this year but blew my wad on climbing equipment. Lol
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You can't make a post like that without pics ;) !
 
DSMc said:
What direction are the weights loaded?
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I’m sorry I don’t quite understand your question. The projectile that you see is filled with an aggravated of steel shot and concrete. There is no movement whatsoever in the weight.
southsoundtree said:
You can't make a post like that without pics ;) !
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as soon as I get it out from the back of my barn. Load up the 2 12v deep cycle batteries I’ll take a picture of it for ya. I used to have a few on my phone but then I lost them all when my phone died and I wasn’t using the cloud. Live and learn.
 
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Whisper said:
I’m sorry I don’t quite understand your question. The projectile that you see is filled with an aggravated of steel shot and concrete. There is no movement whatsoever in the weight...
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Interesting. I would think the loose shot/dead blow hammer concept would be as important on an air launched weight as it is for a hand thrown weight.

But my initial question was in regards to which way the loop tie on the weight is facing, towards the barrel end or the valve, when loaded?
 
DSMc said:
Interesting. I would think the loose shot/dead blow hammer concept would be as important on an air launched weight as it is for a hand thrown weight.

But my initial question was in regards to which way the loop tie on the weight is facing, towards the barrel end or the valve, when loaded?
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I made this one earlier in the spring long before I thought about using a dead blow type fill pattern. Actually the dead blow hammer type idea came from somebody else in this thread. It goes in the way it looks like it should go based on the projectile shape so to answer your question the line is facing out the barrel. The cupped base to the valve.
 
Whisper said:
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It goes in the way it looks like it should go based on the projectile shape so to answer your question the line is facing out the barrel...
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That is why I asked and did not just assume. So all the ballistics within the design will be negated because the weight will invert at some distance from the barrel, when line drag takes effect.

Thoughts?
 
You are correct it should but I haven’t seen that happen while eye balling it in flight yet. But it is a preliminary prototype.
 
The dead blow effect being restricted to the bottom of the projectile, you would either want it to flip in flight (which might result in poor accuracy), or be capable of being loaded so it’s flowing in the right direction, which a tapered top with the line could potentially reduce some aerodynamic friction (carrot shape), but to load it like that you would either need a groove for the line to get past the weight or some type of sabot/wadding
 
LBF said:
The dead blow effect being restricted to the bottom of the projectile, you would either want it to flip in flight (which might result in poor accuracy), or be capable of being loaded so it’s flowing in the right direction, which a tapered top with the line could potentially reduce some aerodynamic friction (carrot shape), but to load it like that you would either need a groove for the line to get past the weight or some type of sabot/wadding
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The carrot was never designed for the Launcher it’s for hand throwing only. When I designed The Carrot I assume that most people did not have a pneumatic launcher. :) i’m happy with the launch weights I have now and how they operate but I will be reviewing that design in the future to see if I can incorporate a dead blow affect with them. It’ll certainly be a design challenge. Thanks for your input. Cheers
 
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Both gravity and acceleration should keep the shot in the bottom of the projectile. That should make the dead blow effect stronger than with a hammer, where the acceleration of the swing forces the shot away from the impacting end, but gravity attracts the shot to the impacting end, at least in the final portion of a typical swing.
 
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