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Grappling Hook 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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Grappling Hook Launcher

Unread postAuthor: crreed » Thu Aug 11, 2011 11:17 pm

Check Out my instructable for pretty much all the info. I also posted a youtube video of a few tests I conducted with it.


http://www.instructables.com/id/Grappli ... -Launcher/

http://www.youtube.com/watch?v=tzTZME7UK54
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Unread postAuthor: Lockednloaded » Thu Aug 11, 2011 11:28 pm

Well it's quite an interesting design, amazing for your first actually!

There are some flaws that you could iron out to get the hook higher, the most pressing issue would be the undersized valve and the flow restriction from the tube, but just keep working on it. Congrats on the great build
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Changes

Unread postAuthor: crreed » Thu Aug 11, 2011 11:43 pm

What would you recommend changing to get a better flow or better performance out of it?
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Re: Changes

Unread postAuthor: Crna Legija » Thu Aug 11, 2011 11:57 pm

crreed wrote:What would you recommend changing to get a better flow or better performance out of it?


connect the barrel directly to the qev not via hose, not sure of the qev size(don't like instructable to slow) but looks like 1/2ish'' I would go for a home made one in a 1'' tee

also a way longer barrel at lest 2x what you have now and more pressure.
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Unread postAuthor: LovableAirGuns » Fri Aug 12, 2011 1:46 am

Thats a very clean launcher I hope to see more from you and i think other members would to.
Great job man :D
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Unread postAuthor: nathanhd123 » Fri Aug 12, 2011 3:40 am

Nice gun, cool design. If I were you I would paint your fire extinqisher to match your gun and possibly all the other parts you can see.
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Unread postAuthor: pneumaticcannons » Fri Aug 12, 2011 4:50 am

All I can say is make ur barrel longer but if its only grappling hooks you want to launch then don't increase you're valve size. You would only do that if you want to launch lighter objects
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Unread postAuthor: jhalek90 » Fri Aug 12, 2011 6:59 am

I like how you used a Nerf raider shell.
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POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Technician1002 » Fri Aug 12, 2011 10:03 am

What the members are mentioning on the flow restrictions is related to how fast the air can exit the tank when the valve is open. You can tell this somewhat by the sound of the launcher. Long after the hook is on its way, you can hear air still leaving the launcher. This is air pressure being released that was not used to launch the hook. With a larger valve more air is used to launch the hook and the time to vent the tank is greatly reduced. Just for comparison, you can listen to the hiss on this cannon with a larger valve. As others mentioned, when launching light projectiles, the rate the valve can flow is critical. I've dented a car door with a marshmallow.
[youtube]http://www.youtube.com/watch?v=GJs8gQAlQn8&[/youtube]
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Unread postAuthor: Tim Jones » Fri Aug 12, 2011 12:53 pm

One of the drawings in your instructable refers to a regulator attached to the downstreem end of the coiled hose. I didn't see one in the part list, and it isn't evident in the photos.

Did you actually use a regulator? If so, what make and model, and where is it on the completed launcher?
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Unread postAuthor: mattyzip77 » Fri Aug 12, 2011 2:32 pm

That is a very cool cannon my friend!! However, from the video, it sounds like your choking air from somewheres, air that should be used to make your valve more powerful. Fix this, and your cannon will be alot stronger and have faster opening time!!!
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Last edited by mattyzip77 on Fri Aug 12, 2011 4:30 pm, edited 1 time in total.
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Valve

Unread postAuthor: crreed » Fri Aug 12, 2011 3:45 pm

Thanks for all of the advice. I did notice the air hissing after it left which also indicated to me it was not be realeased quick enough. My question now is what do I use instead to increase the airflow/ how would i mkae my own QEV valve. Thanks
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