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07172017, 02:25 PM  #1 (permalink) 
Active Member Join Date: Jun 2016  force of propellant
Does anyone know the amount of force that hits the paintball to propell it? I would prefer force of pressure because i do not want to convert haha. im looking for lbs force please if psi is all that is known, i will convert but i would rather have it in lbs force thanks 
07172017, 02:31 PM  #2 (permalink) 
Brass Monkey Customs Join Date: Oct 2006 Location: Bowie MD 
According to am old article by Tom Kay of AGD fame, the pressure is around 60 PSI. According to an online area of a circle calculator, the area is .37 sq in. Therefore 60 PSI x 0.37 sq in = 22.2 pounds of force Someone with a better understanding might be able to get you a more exact number, but this "feels" inline with my experience with markers. Ty
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07172017, 02:40 PM  #4 (permalink)  
Active Member Join Date: Jun 2016  Quote:
P(area)=force now that i have that, i can solve for time in my force equation F=ma a=v/t v=d/t so F= d/t/t or F=md/t^2 therefore time = sqrt(md/f) then once i have time, i can solve for acceleration and then for force of paintball hitting you with in a 3 foot distance. granted the force is less when further away because velocity slows down. thats what im going to calculate next is that. just gotta figure out how to use math equations to calculate the velocity at x distance. might need to use one of the big 3 for it. thanks  
07172017, 02:45 PM  #5 (permalink) 
Some People Juggle Geese Join Date: Mar 2006 Location: Northern MD 
It would depend on the gun you are using. Pounds force is a measure of force and Pounds per square inch is a measure of pressure. You wouldn't be able to convert it with out the area. You need the volume released by the valve at a certain pressure to give you the answer. 
07172017, 02:48 PM  #7 (permalink)  
Active Member Join Date: Jun 2016  Quote:
i could use volume as well and use a differnt equition, probably yield very simular answer as above. thanks for all the input guys.  
07172017, 02:50 PM  #8 (permalink)  
Some People Juggle Geese Join Date: Mar 2006 Location: Northern MD  Quote:
What is your end goal here? To find the force of a paintball hitting a person? To find the force of air hitting a paintball? I don't really understand your intent. If you could give us some more info, we can help.  
07172017, 02:51 PM  #9 (permalink)  
MCB Member Join Date: Dec 2008 Location: Houston, TX  Quote:
 
07172017, 03:04 PM  #10 (permalink) 
Active Member Join Date: Jun 2016 
Yes, i am trying to find the force a paintball hits a person at 3 ft, 50ft, 100 ft and 120 if force=mass(accel) but i do not have acceleration so i must substitute another equation in for a. that is where i use velocity/time but velocity is also distance/time. i sub that in and get force = (mass)(distance/time^2) now i can solve for time and then solve for acceleration. i could use v/t since i know the fps of my marker. but i wanted to try it out this way first for practice now i can solve for force at very close distance but i will need to use another equation for the other distances since velocity is not constant at 3ft vs 100 ft after that, i will then calculate different masses of projectiles and what not. 

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