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<blockquote data-quote="Simon Coffin" data-source="post: 132532" data-attributes="member: 388">Re: No compromises front loaded double 18” cabHey Luke,Nice work on the build.I&#039;m curious about the&nbsp; port design.&nbsp; Based on the link posted earlier in this thread that&nbsp; related aerodynamic theory and especially boundary layer friction to&nbsp; high power port design, your port with the different cross sections top,&nbsp; middle and bottom may not behave consistently.&nbsp; Since the boundary&nbsp; layer is going to affect the narrow center section of the port much more&nbsp; so than the top and bottom, I wonder if the ports effective tuning is&nbsp; going to shift upwards with power.&nbsp; Probably all ports exhibit a change&nbsp; in effective tuning at different air velocities, but this design may&nbsp; exaggerate that behavior.I&#039;m curious what your testing reveals,&nbsp; but a pencil sketch on napkin application of the theory indicates the&nbsp; best port cross section for a high power application is a circle, as it&nbsp; has the least surface area for a given internal area.In either case, nice woodworking.&nbsp; Let us know how they perform.CiaoSimon</blockquote>

[QUOTE="Simon Coffin, post: 132532, member: 388"] Re: No compromises front loaded double 18” cab Hey Luke, Nice work on the build. I'm curious about the port design. Based on the link posted earlier in this thread that related aerodynamic theory and especially boundary layer friction to high power port design, your port with the different cross sections top, middle and bottom may not behave consistently. Since the boundary layer is going to affect the narrow center section of the port much more so than the top and bottom, I wonder if the ports effective tuning is going to shift upwards with power. Probably all ports exhibit a change in effective tuning at different air velocities, but this design may exaggerate that behavior. I'm curious what your testing reveals, but a pencil sketch on napkin application of the theory indicates the best port cross section for a high power application is a circle, as it has the least surface area for a given internal area. In either case, nice woodworking. Let us know how they perform. Ciao Simon [/QUOTE]

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