creative troubles

[Slug Toy]

well i knew 319 liters per minute was too good to be true. damn me and my late night figuring. i think i was way off.

so this should help visualize things. that picture represents dimensions of a single cylinder.

the math is as follows:

volume of the cylinder equals pi R squared times height, and R equals half the diameter. so the are of the top face of the cylinder is 3.14159265358979 x 2.54cm x 2.54cm, which equals 20.268299163899889164 square centimeters (note that ive decided to convert to the metric system.... just because i like it better). the area times the height equals 20.268299163899889164 x 7.62cm, which is 154.44443962891715542968 cubic centimeters, or millileters. 1 cubic cm equals 1 milliliter.

so ideally one cylinder will pump 154.4ml per stroke (0.1544 liters). then over 30 strokes (the 30rpm) this equals about 4.63 liters per minute. this turns out to be about a quarter of what i need.

i cant make the cylinder bigger because thats just getting too large. the only thing i can do is increase the number of cylinders and speed. i dont want to go too fast, so im limiting the rpm to 60 at most. this doubles the flow rate to about 9.26 liters per minute, but its still not really enough. i may need up to 12 cylinders after looking at the PROPER figures now. looks like the radial design is the way to go after all.

god, only i can disappoint myself like this. its a good thing i know not to trust my first reactions and wait a day. that also probably why most of my designing turns out to be retarded.

[GT40_GearHead]

hhhhmm(twich) need 5 minutes to think its 3:00AM in here

[GT40_GearHead]

ok i'm alive (twich)
first of: I subscribed to youre thread, and you got 5 stars from me
there are 2 ways to get a biger flow:
1) diameter
2) a longer travel

and there is one more(twich)
you dont need to have a flat piston-head you can make it convex, like an U shape, not that extreme but you get my point

[Slug Toy]

so lets see here.

1) diameter

that wont work because anything over a 2 inch diameter is too big to fit in a case. ive already allowed for a 12 inch width on the case i designed.

2) a longer travel

same problem here, at most i could increase it by a quarter inch, but no more

you dont need to have a flat piston-head you can make it convex, like an U shape, not that extreme but you get my point

in theory, this is a good idea. in practice, this only works with engines because it increases the volume that is combusting. for a pump, the output is always a function of the bore and the stroke and no matter what you do to the piston shape or the cylinder head, the bore and stroke are still the same, and the output is still the same.

trust me on this one..... this time anyways.... i need more cylinders.

[GT40_GearHead]

hmmm
you're right about the piston-head(that was 3:00 AM thinking), it will just leave some water in the piston,
about the travel, a quarter inch is like 2,45/4=0.6cm hhmmm well it is better then nothing

last night i did some thinking (i didn't go to bed couldn't sleep) you could try a double radial i dont know the english word, my grandfather was a flight mecanic, thay had this kind of engines , its a good design becouse it wont enlarge the diameter, and you get 2 active cilinders instead of one thus double the flow
<edit> (twich) it just hit my head: you could get a radial 12 damn.... motor porn

[silverdemon]

you could get a radial 12

I think that would look sweet, even when you place it on the outside of the case..
I'm beginning to like the idea more and more... Imagine seeing al the moving part and all

hope it'll work in the end

[GT40_GearHead]

MOTOR PORN
that's what it is

[Slug Toy]

I think that would look sweet, even when you place it on the outside of the case..
I'm beginning to like the idea more and more... Imagine seeing al the moving part and all

im liking the idea more and more too. its a strong possibility that ill go with a 12 radial. im already designing.

MOTOR PORN
that's what it is

if you're into that sort of thing i suppose.... but i dont want to hear about it.

try a double radial

ive already passed by that. two six piston radials together would be interesting, but it adds complexity to the crankshaft. i think the 12 radial is the best option now.

[GT40_GearHead]

the porn was i joke man you know in stead oh girls you get a V12 (my weat dream LOL)

so its a 12 radial, when you make the designs could put a hdd or something like that so i can get a fell for its scale

[Slug Toy]

ya i know it was a joke... i just dont want to know anymore than that....

so i got the picture done... sorta. talk about a hassle getting dimensions right. everything was fighting me through this.

so i put in some numbers again, for the things that arent very obvious:

1. this will be the top block that will also house the cylinder intakes. its going to be part of the reservoir too.

2. the cylinder outputs. so there will be pipes on the outside that you can maybe watch air bubbles pass through.

3. thats what a hard drive would look like compared to the pump. you can see its going to be big (i figure about 15 inches in diameter).


one thing i was thinking about while looking at what i designed is water flow inside the top block. seeming as all the pistons will be connected to the same section of the crankshaft, they will be going up and down like a stadium full of people doing the wave. this may make an interesting current inside the block, and it may be a good idea to put the main inputs on an angle so its doesnt cause any turbulence.

ill figure the rest of this out later. right now im kind of dumping memory resources in my head... i just had a geology midterm today.

so ive got to take a break and make dinner now. if you have any questions, now is the time to ask, and ill get back on here ASAP (probably an hour or two).