STEvil Posted November 20, 2011 Report Posted November 20, 2011 Stevil you are full of misinformation lol. Show us a graph and a pressurized flow-test. MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed.
94retta(219) Posted November 20, 2011 Report Posted November 20, 2011 Everything stevil has said so far i will back 100% I actully like my kerf port more then areo's sound wise BUILD LOG
skittlesRgood Posted November 20, 2011 Report Posted November 20, 2011 Depends on your kerf job and final port mouth area and expansion rate. If you build it identical to an aero then of course it will be the same efficiency wise. A kerfed square or rectanglular port simply cannot be as efficient as a round one because, for a given port area, the square or rectangle will have more internal surface area. You do realize that the optimal throat expansion rate is not what used for aero ports, right? They just chose a generic exponential curve and said "this looks cool, lets use it." That said, the performance difference between the two at any point is miniscule and the expansion rates only influence a very small bandwidth beyond the target ported frequency. If you want a big port you go kerfed. If you want a bunch of smaller ports you can go aero. Its personal preference and beyond getting into horn theory there's not much point in discussing the semantics of which is better.. To me, 'aero' refers to the process or application of rounding a port to reduce drag at its leading edges. Whether or not this is of an 'optimal' degree is, like you said, a very insignificant factor as long as laminar flow characteristics are maintained. the term "aero port" came from a company that made a port called "aero port". so it was a product name. they were actually a good deal better than the "psp" ports everyone uses now and they were better because of the size/shape of the flare. If I answered you in a well mannered, informative way, you asked a good question or had a good attitude. If I was an asshole, you asked a stupid question or you had a fucktard attitude... or I was in a bad mood. Team BassickHU: Pioneer AVIC Z110Front: Peerless SLS 6.5", Peerless HDS 4", Rainbow tweeter - running activeAmp: JL HD600/4 and DC 4 channel (bridged to midbass)Processor: JBL MS-8Subs: 2x 12" AA MayhemsAmp: DC 3kElectrical: DC power 270xp alt. 1/0 big 4. XSpower D3400 and six D680s. http://www.stevemeadedesigns.com/board/topic/121795-29-update-the-buick-is-getting-a-rebuild/ Top career scores: DBdrag 151.7 MECA SQ 82.25My SOTM build Yeah. im pretty sure they dont warranty retarded people.
AmericanLegend Posted November 20, 2011 Report Posted November 20, 2011 Okay, it seems like we are discussing different things here. OP asked whether 'kerfed ports' were more efficent than aero ports. A kerfed port is constructed out of formerly flat wood peices. It has a flared aspect from the top and bottom views and its geometry can be any ratio the builder desires. It also has 90 degree (pi/2) corners when viewed from the front. Correct? An 'aero' port is round. I agree with skittles ^^ that there used to be a company that marketed very large flare round ports called Aeroports. There is not a whole lot of technology involved, so other entities began copying them very quickly. The Aeroport and its subsequent copies are all round when viewed from the front. Correct?
AmericanLegend Posted November 20, 2011 Report Posted November 20, 2011 Stevil you are full of misinformation lol. Show us a graph and a pressurized flow-test. I can show you the math and a graph, if you like. As far as the flow test, we would only need a pressure sensor, a pair of standardized ducts (one round, one rectangular), an enclosure, and a fan. I hypothesize that the rectangular port will have more loss of pressure inside the duct than the round pipe. You disagree?
94retta(219) Posted November 20, 2011 Report Posted November 20, 2011 Stevil you are full of misinformation lol. Show us a graph and a pressurized flow-test. I can show you the math and a graph, if you like. As far as the flow test, we would only need a pressure sensor, a pair of standardized ducts (one round, one rectangular), an enclosure, and a fan. I hypothesize that the rectangular port will have more loss of pressure inside the duct than the round pipe. You disagree? Surface area is surface area. Doesnt matter rather its round or flat. To tune a port its done by effective suface area. Its all about the mouths of it. With a larger enclosure it takes multiple areos, were you could do a really well built kerf port and its going to be the same if not better then the areo. Imo it would be better its less restriction BUILD LOG
STEvil Posted November 20, 2011 Report Posted November 20, 2011 Stevil you are full of misinformation lol. Show us a graph and a pressurized flow-test. I can show you the math and a graph, if you like. As far as the flow test, we would only need a pressure sensor, a pair of standardized ducts (one round, one rectangular), an enclosure, and a fan. I hypothesize that the rectangular port will have more loss of pressure inside the duct than the round pipe. You disagree? That depends, are you making them identical in size, or identical in volume, or averaging the volume/surface area ratio? MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed.
AmericanLegend Posted November 20, 2011 Report Posted November 20, 2011 Stevil you are full of misinformation lol. Show us a graph and a pressurized flow-test. I can show you the math and a graph, if you like. As far as the flow test, we would only need a pressure sensor, a pair of standardized ducts (one round, one rectangular), an enclosure, and a fan. I hypothesize that the rectangular port will have more loss of pressure inside the duct than the round pipe. You disagree? Surface area is surface area. Doesnt matter rather its round or flat. To tune a port its done by effective suface area. Its all about the mouths of it. With a larger enclosure it takes multiple areos, were you could do a really well built kerf port and its going to be the same if not better then the areo. Imo it would be better its less restriction Not true. The shape of the duct plays a major role in its flow characteristics, including its pressure loss over the length of the duct. That's like saying that all 20 inch tires grip the same lolz. Tell you what, build a STAR-SHAPED duct with equal area as a 4 inch un-flanged pipe. The 4 inch pipe will get louder and exhibit less 'chuffing' at the audible end of the port. Why is this?
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