Teal Ballista

by thinkpool, published

Teal Ballista by thinkpool Nov 11, 2017
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Teal Ballista by thinkpool is licensed under the GNU - LGPL license.

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1534Views 85Downloads Found in Mechanical Toys


I think drone flying should be an Olympic event and the Teal sport would be the ideal candidate for events like drone aerobatics, obstacle race and "race and target".

My design allows the pilot to fire 5mm plastic pellets using an air compression cartridge released through remote control. The design can hold 100 pellets that can travel up to 50
feet at 185mph. The key to this design is to maintain functionality but also keep the weight to a minimum.

The current design will allow one or several pellets to travel approximately 50 feet with 120PSI compression. I am collaborating with a designer so any reward for this design will be shared.

Its time to broaden the Teal market.


My design utilizes a standard 12g CO2 cartridge found in most stores. The 120 PSI air compression has a load to propel about 100 - 150 pellets.

The components total cost is $58 and as we refine this design to make it lighter, less metal components will be required. Here's the short list:

Pneumatic Solenoid valve + M4 screws
Cartridge intake Valve
1/4" pipe taps x2
1/4" plastic flexible hose
5.2mm barrel
5mm plastic pellets
CO2 12g cartridge

excel 10M 32.8Ft 6mm x 4mm Pneumatic Polyurethane PU Hose Tube Pipe Blue
amazon https://www.amazon.com/uxcell-32-8Ft-Pneumatic-Polyurethane-Hose/dp/B008MO66FO/ref=pd_bxgy_328_img_3?_encoding=UTF8&psc=1&refRID=PGWK5XJV0EYP8PPDQAMS
10 Pcs 1/4" PT Male Thread 6mm Push In Joint Pneumatic Connector Quick Fittings

Some parts can have lighter alternatives that you can find around the home. This is a fun assembly that will require minimal tools to put together including a hot glue gun.

The compressed air is released through the Pneumatic valve via a remote control signal. The Pneumatic valve will close once the electrical charge is gone so you can have single shots or large bursts. The pellet canister on the design can hold about 100 pellets.

How I Designed This

How it works

Unscrew the pellet container on the model and fill with 100 pellets. Connect the CO2 cartridge to the cartridge valve. The Teal will require a remote controlled connection for the air release pneumatic valve. Once the remote control button is initiated, compressed air rapidly pushes pellets through barrel.

Cross hairs will be visible through the viewer goggles and will allow the pilot to target through the camera. (Programming will be required to add this feature.)

Other uses for this design

Customers want options for their drones and a design like this will broaden the market.
Affixed with a night vision camera, a pilot can deter pests from their property at night.
Aligned with the proper software the drone could operate as an autonomous security system for a residency.
You can even get into Combat Droning(TM) through 1 on 1 events.

The possibilities are endless and I will continually perfect the mechanics.

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The CO2 cartridge isn't 120 psi, it's about 800 or 900! You see, when you connect the cartridge to a bike wheel, it leaves the wheel at about 120 psi. However, the CO2 is much more compressed inside the cartridge (as there is less volume, the pressure isn't 120 psi but 900 psi!). The solenoid won't work with such high pressures; it will just let the air out (if it doesn't actually explode xD).

Moreover, you would need to use a relay in order to get the 12V needed for the solenoid!

I'm working on a similar project and I'm using a servo to open a mechanical valve, as I haven't found a cheap, high pressure and lightweight solenoid.

Edit: by using a servo, I don't think you could actually close the airflow once opened.

Google Model Warship Combat. They use homemade BB guns to sink each other's boats (balsa wood sides) and have a variety of firing methods, and a few commercially available, extremely small systems. It's a well solved problem, with solenoids or micro servos used as actuators.

Be careful if you ever do this in real life! The liability risks are probably enormous for putting this sort of thing on a drone.

I'm sure they don't use 800 psi CO2 cartridges with 120 psi solenoids, as thinkpool does in his project...

I think they use the same commercial airsoft cartridges as everyone, and their solenoid-controled systems run at 150 psi. Here's a 150psi regulator:


It's pretty cool stuff. They are actually shooting each other's models with metal rounds and have managed to keep insurance coverage of it through extremely strict safety rules.

Thank you for your interest in this project
We are using a low compression CO2 cartridge that works with the solenoid valve. Ultimately we would like to use the high compression cartridge so we designed a micro solenoid valve that runs on 6V. This micro valve will solve your dilemma but in order to get it manufactured, the Chinese producers want an order of 100K units.
Its seems that everyone including yourself wants a drone of this design so we plan to acquire funding and develop the Drone Combat culture. We've even pitched the concept to a network that requested a demo of the show. The Combat Drone show will pit teams against each other through 4 challenges and ending in a 4 on 4 drone battle royal. We are hoping to pitch the concept using the Teal Sport as the flagship drone. Let me know your ideas we are willing to work together.
So we ask everyone to support this project so that we can get this off the ground. We accept any support from drone enthusiates like yourself.

Comments deleted.

Wouldn't this cause bad weight distribution and unbalance the drone? I get that MAYBE the C02 tank and servo would be balanced by the BB's, but as you shoot, you would loose weight on one side. Also, the discharge of high pressure air would shake and push the drone. Newton's laws. Nice concept, but ultimately counter intuitive.

Thank you for your comment.
You have a keen eye and weight distribution was taken into consideration. If you look closely you will notice that the heavier components (Pneumatic valve and CO2 cartridge) are positioned closer to the center. Secondly the force required to propel a .12 gram pellet can easily be absorbed by the drone. We are continually improving this design and would appreciate any suggestions on balancing, etc. We can't wait to display the prototype. Thanks

First of all, this would be awesome...if you make it please post videos! One question though, it looks like you are simply piping the CO2 into the pellet reservoir and hoping a pellet finds the exit? ...seems extremely unpredictable/unreliable at best. Am I missing something? Nice work on your drafting!

Thanks for the comment.
The simplicity of the design is critical in order to keep the weight down. The uniqueness of the pellets is that they will follow where ever the air flows. Take a look at these Youtube videos.

Let me know if you have another suggestion on how to feed the pellets. Thanks

Thanks for the video, I might have to try that! :) Simplicity is certainly key here and your point about the weight of the pellets makes sense. On the other hand they had a lot more air to work with in the video. I don't know, you've certainly convinced me it's worth at try! Good luck! :)