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View Full Version : Air flow theory, w/****** paint drawing.



NoCoSPL
11-18-2009, 08:43 PM
So the car, lets say its an SUV, doesn't look like one but you get the point. :D

Port facing up and tight against the rear hatch, speakers firing forward. Looking at the air flow it has a push/pull effect on every cycle. This of course is just on a single cycle on the sub being pushed in, change arrows for the sub being pushed out. . . I need to be proven wrong is the thing, i think that this would be louder due to the circular affect of the air moving along the curvature of the vehicle, right? Im sure there are some out there that could explain to me why or why not this would be better than a different setup. I am already preplanning for my next vehicle and im thinking of a VW Gti rabbit or an suv of some sort.

I kinda view a sub back, port back as a circular motion from air being pushed from the speaker front and being ****** into the port right next to it, lost sound? Idk, I need to be told whats up, wrong or right, i wants to learn more about some air flow!!!





http://i49.tinypic.com/1jreaw.jpg

Johnny Law.Lulz
11-18-2009, 08:45 PM
That drawing is ****** :fyi:

ciaonzo
11-18-2009, 08:47 PM
That drawing is ****** :fyi:

X a bazillion. :veryhapp:

infamous_e46
11-18-2009, 08:49 PM
that drawing is sick wow i cant beleive ca.com had such a gifted artist hidden within its bowels

S.B.C.
11-18-2009, 08:50 PM
The theory of your pic would be nice, but isnt usually the case. Once it hits the roof, the wave will bounce in whatever direction.

It will hit the roof, and may come back at the box, or hit the roof and disperse 360 degrees.

If you have minimal flex, then the wave will travel easier.

CRX's are great for this reason, alot of rear window to bounce off of and shoot the wave forward.

Main thing is to eliminate flex- and play w port placement.

Most SUV's like sub up port back

Random1010
11-18-2009, 08:51 PM
God **** I wish I had skills like that..

NoCoSPL
11-18-2009, 08:52 PM
that drawing is sick wow i cant beleive ca.com had such a gifted artist hidden within its bowels

:veryhapp: <3 you

ngsm13
11-18-2009, 08:53 PM
The problem is, that's not how it works in real life.

nG

NoCoSPL
11-18-2009, 09:00 PM
The theory of your pic would be nice, but isnt usually the case. Once it hits the roof, the wave will bounce in whatever direction.

It will hit the roof, and may come back at the box, or hit the roof and disperse 360 degrees.

If you have minimal flex, then the wave will travel easier.

CRX's are great for this reason, alot of rear window to bounce off of and shoot the wave forward.

Main thing is to eliminate flex- and play w port placement.

Most SUV's like sub up port back

I see i see, flex i can see could ripple the sound wave distorting it sending it in wrong directions. Would this theory generally work well if the vehicle is very well rounded?

jonny101abc
11-18-2009, 09:07 PM
God **** I wish I had skills like that..

X2

infamous_e46
11-18-2009, 09:08 PM
http://i45.tinypic.com/whzaqg.jpg

:fyi:

ciaonzo
11-18-2009, 09:10 PM
lmao

S.B.C.
11-18-2009, 09:14 PM
I see i see, flex i can see could ripple the sound wave distorting it sending it in wrong directions. Would this theory generally work well if the vehicle is very well rounded?

The contour of the vehicle will help the wave travel, as long as it doesnt flex

thats why you see extreme vehicles use concrete in their walls, floors, doors etc- but they also use walls..

its all about bouncing that wave off something that wont move- hence why rear walls are usually so thick.

subw123
11-18-2009, 09:27 PM
God **** I wish I had skills like that..

then do some studying bub it aint that hard to figure outr!!

stevew007
11-18-2009, 09:32 PM
ive seen a couple of vw bugs new and old try that same design and did **** pour in both

SSS 18734
11-18-2009, 09:38 PM
lol. That theory might work IF sound waves even remotely worked that way.

You're scoring over 150db and you still think sound works like that?

Supergumby5000
11-18-2009, 09:44 PM
lol. That theory might work IF sound waves even remotely worked that way.

You're scoring over 150db and you still think sound works like that?

and your point would make sense if you took high school english/reading.


he is talking about air, not sound waves

TnT_Sounds
11-18-2009, 10:23 PM
Only problem I see is soundwaves don't travel in a circular motion, if I'm not mistaken.

Edit- Now that I re-read it, I can see some truth to the supposed theory. Come to think of it, I believe that is what the guys in the UK and Brazil do similar in the Pandas. I would imagine to get the perfect circular air movement would require undefined testing and experimenting. The sub correlation could be a conflict when the air movement would come into contact with that part. Seeing as the air would be moving in one direction while the woofer was moving another.

There could be a simple way to 1/10th scale testing I would imagine. Water in place of air in a controled environment, or compressed air with dust particles or slight amount of liquid.

jonny101abc
11-18-2009, 11:08 PM
http://i45.tinypic.com/whzaqg.jpg

:fyi:

just draw arrows on that, and it looks like the OP pic. LULZ

ascitiesburn69
11-18-2009, 11:12 PM
It may work if you took all your seats out and cemented your roof and everything else.

NoCoSPL
11-18-2009, 11:41 PM
I lol'd at the pic for sure

mlstrass
11-19-2009, 12:43 AM
and your point would make sense if you took high school english/reading.


he is talking about air, not sound waves

so you're saying the back wave does NOT come out of the port opening :confused:

Also I don't think the sound waves would have enough velocity to just shoot straight up off the roof. Would be interesting to try and test that...

mlo
11-19-2009, 12:48 AM
After many years of working in fields concerning flow dynamics I have learned one fundamental thing. Air almost never does what you think/expect it to. The situation you have illustrated IMHO would infact not prove out. Air will always take the path of least resistance. And many things would create variables on its influence. Such as inside/outside temp, iniside obstacles, humidity, speed of vehicle etc. This could easily be mocked up in a garage with smoke instituted for some empiracle static testing.