Super Soaker Central forums

Silence · 01-18-2007, 10:47 PM

I didn't really explore their formula(s), just the calculator on the site. Pretty neat! Ben has tried to come up with a way to calculate the ideal length before, but it became too complicated too quickly. What we do know is that longer is nearly always better, as the lengths are generally past the limits of pneumatic launchers*. But that's why I recommend a much smaller PC and a longer barrel, for less pumping--but I have yet to build something.

Yup, nested pumps help, but you don't want too many. That would add excessive complexity, especially if a certain stage is already only a few inches long. Try going for a smaller PC/less pressure.

*On a sidenote, if anybody here watches Mythbusters, you might have seen their system to generate winds to send a reed through a palm tree. Not exactly a launcher, but really long, and nobody else is insane enough or rich enough to build one.

TheEngineer · 01-19-2007, 12:34 AM

Oh sweet jebus. Well, after hours of work. I found that it is impossible to do what I wanted.

Unless I can stretch my arms out 4 feet. HA!

I think what is happening. Is that the volume to pressure that I need is on the edge of an asymptote for the pumping ability. Lesson learned. However I will still probably get to working on my launcher idea again. Its just too irresistable. I will also work on some plans on a water gun. Not sure how thats going to pan out. But I have high hopes.

However, I will send my excel worksheet to anyone that wants it. Its got alot of good info on it.

Also, does anyone have any formulas for multiple pumping?

Ben · 01-19-2007, 06:25 AM

You have to follow an algorithm to do more than one pump. Basically, just do one pump to find out the pressure and volume of the chamber first off and then use those numbers again to find out the volume of the second pump. Tedious, but it's the easiest way to do it.

C-A_99 · 03-14-2007, 03:46 PM

Hey, it's pi day.

Sorry, random and relatively pointless post but I just had to get it out.

dizzyd · 11-26-2007, 11:34 AM

Hey can i get that excel spreadsheet please?

Silence · 11-26-2007, 05:41 PM

Just a reminder: note the dates of posts before replying. This thread is nearly a year old, and TheEngineer's public profile says he hasn't logged in since 01-22-2007. He left his email though, so you could try contacting him through that.

01-18-2007, 10:47 PM	#16
Silence Administrator Join Date: Apr 2006 Location: Virginia Posts: 3,285 UserID: 576	I didn't really explore their formula(s), just the calculator on the site. Pretty neat! Ben has tried to come up with a way to calculate the ideal length before, but it became too complicated too quickly. What we do know is that longer is nearly always better, as the lengths are generally past the limits of pneumatic launchers. But that's why I recommend a much smaller PC and a longer barrel, for less pumping--but I have yet to build something. Yup, nested pumps help, but you don't want too many. That would add excessive complexity, especially if a certain stage is already only a few inches long. Try going for a smaller PC/less pressure. On a sidenote, if anybody here watches Mythbusters, you might have seen their system to generate winds to send a reed through a palm tree. Not exactly a launcher, but really long, and nobody else is insane enough or rich enough to build one. __________________ Forum rules

01-19-2007, 06:25 AM	#18
Ben Founder Join Date: Mar 2003 Location: College Park, Maryland Posts: 6,042 UserID: 1	You have to follow an algorithm to do more than one pump. Basically, just do one pump to find out the pressure and volume of the chamber first off and then use those numbers again to find out the volume of the second pump. Tedious, but it's the easiest way to do it. __________________ Note: I am busy so if I am slow to respond, be patient. email: ben at sscentral dot org / Forum rules / Read this page before emailing me. Do not send me a PM or email with a water gun question if someone else could answer the question. Post at the forums. You will get a response from me along with others' views or ideas.

03-14-2007, 03:46 PM	#19
C-A_99 Senior Member Join Date: Aug 2006 Location: MI, US Posts: 470 UserID: 809	Hey, it's pi day. Sorry, random and relatively pointless post but I just had to get it out. __________________ http://hbww.fateback.com/index.html Website w/ info on teams, armory, etc.

11-26-2007, 11:34 AM	#20
dizzyd Junior member Join Date: Nov 2007 Posts: 6 UserID: 1416	Re: Pump Forces, and Pressures Hey can i get that excel spreadsheet please?

11-26-2007, 05:41 PM	#21
Silence Administrator Join Date: Apr 2006 Location: Virginia Posts: 3,285 UserID: 576	Re: Pump Forces, and Pressures Just a reminder: note the dates of posts before replying. This thread is nearly a year old, and TheEngineer's public profile says he hasn't logged in since 01-22-2007. He left his email though, so you could try contacting him through that. __________________ Forum rules

01-19-2007, 12:34 AM	#17
TheEngineer Junior member Join Date: Jan 2007 Posts: 8 UserID: 955	Oh sweet jebus. Well, after hours of work. I found that it is impossible to do what I wanted. Unless I can stretch my arms out 4 feet. HA! I think what is happening. Is that the volume to pressure that I need is on the edge of an asymptote for the pumping ability. Lesson learned. However I will still probably get to working on my launcher idea again. Its just too irresistable. I will also work on some plans on a water gun. Not sure how thats going to pan out. But I have high hopes. However, I will send my excel worksheet to anyone that wants it. Its got alot of good info on it. Also, does anyone have any formulas for multiple pumping?

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