If i put the fan completly in the back, does it have any use then? I can imagine that a fan in mid-chamber mixes more effectively.. Im thinking about fitting a very small fan (60x60mm) in my future gun so it blocks less and still can be mid-chamber, good idea or should I take the hugest fan that fit...

could you post a scheme?
that would be very very nice

Another question: Doesnt the fan block some explosion or airflow from the explosion? It may divide your chamber into 2. I once saw a few frame by frame pics wich showed he had 2 seperate combustions in his gun (though very very short after each other i kno) First one in the front, then one behind th...

thanks for your answer and thanks for the scheme
my first real comb spud was planned to have a 1:1 ratio
i see now that .8 may be better but indeed, it doesnt really make much difference

so ill keep it that way
well thanks again

I dont know the answer but i think chamber fans dont get damaged by the combustion, they just get warm. (correct me if im wrong)

I would like to add aswell:
What if the fan SPARKS inside!? Ehhh BOOM?

e1337 wrote:Cool, Can you see the flames in the bottle?

yup, it gives an orange flash and the bottle gets very warm

the flames last for a very short time and arent really bright, it are more darker orange flames

Thanks for the answer. I just wanted to add the following: This thing has a C:B ratio of 15! :P And about the ABS-PVC: ABS has chemical resistance, PVC doesnt Though PVC is stronger.... I think ill be using PVC in my realy spud. Im using hairspray as fuel (i know there are better fuel but hey im sti...

Hi guys, I just came on this forum today and I have a question about C:B ratio. Im planning to build my first real combustion spudgun soon. Now i have read alot about ratios and some people say 0.6:1 is best, some say 0.7:1, 0.8:1, 1:1 or 1.5:1 Now i know a ratio thats too small will ruin the perfor...

Hi all, This is my first post here and also my first gun. It is not a real spud gun, its a smaller caliber. It was a nice project to gain some experience with spudgunning and soon ill be going on to the real work. About the gun: It is a 1,5L coke bottle attached to a PVC pipe (13mm diameter, 49cm lo...