I revisited this thread because the hydrodynamic discussion was interesting and informative. I miss the mad scientist's pronunciations. It was so sad to see his posts of the motor bikes. But at least, like the saying goes...doing what he loved.
I wonder what GG said to Pyzel about the latter's single with inset double concaves???
Also, an exchange between Mr. J and Senor Sopa about water wrapping around the rail caught my attention this time around. It is a common conception that water wrapping around the rail creates hold. If that is so, why do all makers (and I mean ALL) have hard edges in the tail, where I assume you want the most control? I think Mr J said something about the hard edge on a skimboard creating grip. So what are GG's hard edges forward doing? Releasing=creating speed? Or are they a control element, creating grip? A ridge creating directional stability? Mr J said slight concave with hard edges were slippery. I feel the concave accentuates the release, creating speed at low speed (first turn, immediate acceleration) and then, at high speed, the fins take over for control, reducing the control liability of the hard edges up front. Also the fins reduce the need for a control element in the tail.
Maybe?
ps hard edges (chines) have been adopted by the sailing community. Originally it was to induce planing (release) of skiffs and wide hulled race boats. Now it is also seen as adding directional stability in wide hulled cruising boats.
This part caught my attention- “You want to prevent the boat from sucking itself to the water surface. So, adding a flat and wide stern was combined with the hard chine – this combination of design features made the boats entering plane-mode quickly, especially on reaching points of sail and at the same time prevented the fast hull to suck itself to the surface hence slowing down.”
Release!
"The line of the chine at the same time adds directional stability making the yacht want to sail in a straight line."
(Directional) Stability!
I wonder what GG said to Pyzel about the latter's single with inset double concaves???
Also, an exchange between Mr. J and Senor Sopa about water wrapping around the rail caught my attention this time around. It is a common conception that water wrapping around the rail creates hold. If that is so, why do all makers (and I mean ALL) have hard edges in the tail, where I assume you want the most control? I think Mr J said something about the hard edge on a skimboard creating grip. So what are GG's hard edges forward doing? Releasing=creating speed? Or are they a control element, creating grip? A ridge creating directional stability? Mr J said slight concave with hard edges were slippery. I feel the concave accentuates the release, creating speed at low speed (first turn, immediate acceleration) and then, at high speed, the fins take over for control, reducing the control liability of the hard edges up front. Also the fins reduce the need for a control element in the tail.
Maybe?
ps hard edges (chines) have been adopted by the sailing community. Originally it was to induce planing (release) of skiffs and wide hulled race boats. Now it is also seen as adding directional stability in wide hulled cruising boats.
Hard Chines in Sailboat Design |
no-frills-sailing.com
This part caught my attention- “You want to prevent the boat from sucking itself to the water surface. So, adding a flat and wide stern was combined with the hard chine – this combination of design features made the boats entering plane-mode quickly, especially on reaching points of sail and at the same time prevented the fast hull to suck itself to the surface hence slowing down.”
Release!
| The benefits of chined yacht hulls:Performance Boating
www.performanceboating.com.au
"The line of the chine at the same time adds directional stability making the yacht want to sail in a straight line."
(Directional) Stability!
Last edited: