Noise cannon for RC planes

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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hectmarr
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Sat Nov 25, 2017 8:43 am

Very good job, I repeat it again. The shots sound excellent in your video. regards :bounce:
Ideas don't make holes, guns do!
Futterama
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Sat Nov 25, 2017 9:40 am

hectmarr wrote:Very good job, I repeat it again. The shots sound excellent in your video. regards :bounce:
Thanks! I really appreciate your feedback :)
Air2theBrain
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Sat Nov 25, 2017 3:09 pm

That sounds awesome..i would be ducking for cover if i heard that.

In this day and age what a great way to clear a crowd. :)
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jackssmirkingrevenge
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Sun Nov 26, 2017 7:17 am

Air2theBrain wrote:In this day and age what a great way to clear a crowd. :)
ehhh, there are other ways being explored in less stable parts of the world...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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hectmarr
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Sun Nov 26, 2017 9:37 am

jackssmirkingrevenge wrote:
Air2theBrain wrote:In this day and age what a great way to clear a crowd. :)
ehhh, there are other ways being explored in less stable parts of the world...
God ... We can not sleep in peace anymore? Terrible this. :(
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Futterama
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Thu Dec 21, 2017 10:29 am

The RC community is having fun:

https://www.rcgroups.com/forums/showthr ... st38848624

[youtube][/youtube]
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hectmarr
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Thu Dec 21, 2017 4:13 pm

Its design is very interesting. What I do not understand is how he does not feel like ejecting any projectile of any kind. :twisted: :twisted: :twisted: :twisted:



( I say this in jest, no doubt. :))
Ideas don't make holes, guns do!
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jackssmirkingrevenge
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Thu Dec 21, 2017 5:31 pm

Good to see the love being spread :)
hectmarr wrote:You have to make many weapons, because this field is long and short life
Futterama
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Fri Dec 22, 2017 6:35 am

hectmarr wrote:What I do not understand is how he does not feel like ejecting any projectile of any kind.
We don't want to fuel the fire against drones (RC planes are considered drones) so we need to behave :lol:
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hectmarr
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Fri Dec 22, 2017 6:41 am

Futterama wrote:
hectmarr wrote:What I do not understand is how he does not feel like ejecting any projectile of any kind.
We don't want to fuel the fire against drones (RC planes are considered drones) so we need to behave :lol:
I understand very well what you mean ... I am a modeler and we have had problems with gun shots to our models. It is preferable not to "awaken the unscrupulous."
Ideas don't make holes, guns do!
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jackssmirkingrevenge
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Fri Dec 22, 2017 9:17 am

Futterama wrote:We don't want to fuel the fire against drones (RC planes are considered drones) so we need to behave :lol:
That is a fair point and an admirable one, but it's a shame because something like this is fuçking awesome!

[youtube][/youtube]
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Cthulhu
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Fri Dec 22, 2017 9:29 am

jackssmirkingrevenge wrote:
Futterama wrote:We don't want to fuel the fire against drones (RC planes are considered drones) so we need to behave :lol:
That is a fair point and an admirable one, but it's a shame because something like this is fuçking awesome!

[youtube][/youtube]
:shock: I need a tank version of this.
Is he using an AEG system to reduce weight or does he have CO2 cartridges?
This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
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jackssmirkingrevenge
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Fri Dec 22, 2017 9:38 am

From what I can tell it's an electro-pneumatic system that uses a solenoid to reciprocate the barrel, this simultaneously feeds a BB and opens a valve:

[youtube][/youtube]

[youtube][/youtube]
hectmarr wrote:You have to make many weapons, because this field is long and short life
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hectmarr
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Sat Dec 23, 2017 5:34 am

It looks very good this machine gun and not dangerous, I like it. The only thing that is missing is that it sounds louder because it is difficult to hear with the model aircraft a little away from the public, and even more so if it is a model aircraft with a turbojet engine. Maybe yna soundboard ?.
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Futterama
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Sun Jan 07, 2018 11:55 am

The weather has been cold but calm and dry the latest few days so I finished up some work on my test plane to get it in the air again.
I mounted the propane canister and my controller board so I could go test shooting the sound cannon.

I could get the sound cannon to shoot when on the ground with engine off (no blowing of air into the air intake) but it wouldn't shoot on the one test flight I got with it.

My home made exhaust rattled loose so I did not get to test more than 1 flight today.

Good news is I did not crash, the frozen ground did undo all my foam tires from the wheel hubs, but no damage to the plane.

Oh yeah, no radio glitches from firing the cannon, that isolated spark plug must have done the trick because I forgot all about the HV resistor! :shock:

Now the question is, do I get too much air into the air intake or not enough? The easiest to do would be to restrict the air flow and start there, see if less air will make a difference. If not, I will have to make a bigger air intake or start fiddling with forced air from a blower but I hope the natural air intake will do.

More flight updates when weather is better, until then, I will have to test with the plane on the ground and engine off or on at different throttle settings, maybe I can learn something from that.
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