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Noise cannon for RC planes

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Re: Noise cannon for RC planes

Unread postAuthor: Futterama » Sat Oct 08, 2016 3:45 pm

Steel initiator chamber is ready for testing! 8)

I have also started to prepare the left wing of the RC plane for sound cannon installation. A buddy of mine suggested that the main tube should be split into parts so it would be easier to install, and I see he has a point, because due to the bending of the tube, it would be impossible to install without major wing surgery, which I need to avoid. I don't wanna leave the wing weaker than before cannon install. I have some silicone tubing that I can use for the joint/joints.

Silver soldering the parts together went OK, but I can see I need a bit more practice before it reaches my standards, but this will be fine for testing.
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Re: Noise cannon for RC planes

Unread postAuthor: jean » Thu Oct 13, 2016 5:46 pm

Very good!
Cool project and strait forward solutions..thanks for sharing this stuff.

peace
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Re: Noise cannon for RC planes

Unread postAuthor: Futterama » Mon Oct 17, 2016 1:50 pm

jean, thanks! I enjoy sharing this, and I also use this thread as documentation for my own use.

I tested the new initiator chamber a few days ago, but with 10cm extra main tube, that did not work out very well, and the 3D printed mixer keeps melting.

So I made a mixer from aluminium with a new brass nozzle (M6 brass rod, 0.3mm hole), and attached it to the mixer tube with a 3D printed coupling, this is temporary as I have plans on either use a piece of silicone tubing for connecting the two parts, or make external threads in the aluminium mixer and make a steel adapter with internal threads which can then be silver soldered to the mixer tube.
I also took out the extra 10cm of main tube and went testing tonight in the dark.

What a great experience! :mrgreen:

It worked so well! And for so long too! The only part that gave up was the 3D printed barrel, this is the next part I need to make from steel and I know exactly how I want to do it.
The darkness makes it possible to see the blue flames coming out of both the intake and barrel which is really cool. The sound level was amazing and the obtainable rate of fire is good, the last testing was made at 330 shots per minute still with good consistent sound, I think this is a record! It's going to sound really cool with 2 cannons shooting at this speed 8)

Pictures of current setup:
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Re: Noise cannon for RC planes

Unread postAuthor: Futterama » Wed Oct 19, 2016 2:23 pm

Steel cannon barrel is ready.

I tried to use the tubing from the weed burner, but its OD was 1mm too small to fit tightly inside the main tubing, so I tried to expand the end of the tube, but didn't have much success. So I went to the local plumbing store and got a piece of 3/8" steel pipe, this had the perfect OD for fitting in the main tube but needed boring to get to an ID of 13mm along with a little work on the lathe to get the OD down on the barrel itself. Final weight of the barrel piece was 11.7g.

I managed to make a pretty nice barrel with ID 13mm, OD 14mm and length 60mm. The thicker end fits tightly into the main tube so it was easy to silver solder it in place.

I'm very pleased with the result 8)
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Re: Noise cannon for RC planes

Unread postAuthor: Futterama » Thu Oct 20, 2016 1:23 pm

I tested the new steel barrel today, and it works flawless even though it is 50% longer than the red 3D printed plastic one I have been using up until now.

On the video I'm shooting at 318 shots per minute. I'm far enough away for not wearing ear protection, but the sound is still too loud for my phone camera mic. How can I record this with better sound, any suggestions?

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Re: Noise cannon for RC planes

Unread postAuthor: mrfoo » Thu Oct 20, 2016 3:05 pm

That's a pretty good result, right there. Nice.
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