How do I figure CLw for sponsons with any other deadrise (bdr) besides 10 degrees?
I’m glad that you’ve enjoyed the STBD book. To answer your 1st question, the calculation for water lift coefficient CLw for varying deadrise (BDR) is very complex, which is why I didn’t put it in the book. The TBDP software (Version 7) allows for the input of specific sponson deadrise and also a center-pod deadrise (for modified vee designs), and completes the analysis of performance and stability based on these and many other inputs. In your 2nd question, you mentioned the question of induced drag due to edge vortices. This affects both water drag and aero drag. I think you were referring to aero drag. There are edge vortices associated with the airflow over the deck surface. The tunnel walls (under the tunnel) reduce overall vortex shedding significantly, but there remain some affects of air spilling off the deck into lower pressure areas in the chine and sheer areas.
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- How do I figure CLw for sponsons with any other deadrise (bdr) besides 10 degrees?
