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Rifle to combustion double camera, caliber 4.75 mm

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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Rifle to combustion double camera, caliber 4.75 mm

Unread postAuthor: hectmarr » Mon Sep 03, 2018 7:20 pm

I was trying to finish this little project and I managed to do it :D
It is a combustion gun that works with ethyl alcohol. It has a double combustion chamber system, to increase a little the firing pressure, because the caliber is very small. I calculate that energy increases approximately 30% - 40%, since with a single combustion chamber the firing is very smooth.
Use a small air pump, to clean the two chambers after each shot, and to spray the alcohol finely inside the two chambers. The amount is regulated approximately, with the amount of pumping, about 4 normally. The ignition is electronic multi spark, of those used in gas stoves.
It has a capacity for 8 steel ammunition, and a manual loading system. The ammunition is loaded after loading the fuel inside the chamber.
It is built in light wood and the chambers are made of aluminum coated with a thin layer of fiberglass. In the future I will upload a video.
The shots are roughly even, acceptable, and the accuracy equally acceptable at 10 meters. It is very fun to shoot, it makes almost no noise, and having everything incorporated you can walk through the green of my property playing a little, with nothing but the gun and the complete magazine, and the ammunition in your pocket. I hope you like it. Regards!! :)
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Attachments
Vista general del rifle.JPG
Vista general, 2.JPG
partes de madera.JPG
sistema de carga de munición BB  acero, 4,76mm.JPG
Sistema del gatillo - chispero.JPG
Vista sistema doble cámara, inflador y cañón..JPG
depósito de alcohol.JPG
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hectmarr
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Re: Rifle to combustion double camera, caliber 4.75 mm

Unread postAuthor: iknowmy3tables » Sun Sep 09, 2018 10:24 pm

nice build, what do you mean by a "double combustion chamber system"
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Re: Rifle to combustion double camera, caliber 4.75 mm

Unread postAuthor: hectmarr » Mon Sep 10, 2018 8:52 am

iknowmy3tables wrote:nice build, what do you mean by a "double combustion chamber system"


Thank you :) Look at my post:
miniature-cannons/topic26503.html
Something more of this here:
hybrid-cannons/topic26676-45.html#p384694
There is the basic explanation of the principle of double combustion chamber. There is a scientific article on this subject:
https://bora.uib.no/bitstream/handle/19 ... sAllowed=y
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