this is another query for herb regarding his superchargers. i seem to remember that a while back you gave some explanation as to why they worked and it mostly focused around keeping the water flow attached to the outer surface of the fin when it was at a large angle to the water flow in a turn. not a very good summary i know, but to get to my point if there are any other sailors out there then i am sure they are familiar with slotted wave fins. this slot near the leading edge allows water to come through and keep the flow attached to the lower pressure side of the fin. basically this means that it is much more difficult to spin out at the cost of a bit of extra drag. i am wondering if a similar treatment to the outboard fins of a thruster would have a similar effect as herb’s superchargers. has anyone ever tried this sort of setup and what were the results. the thought that plague my mind in the wee hours. trev
I remember that Hamish Graham used this type of fin for a while on his boards when he was shaping Byrning Spears out of Santa Barbara (about 10 yrs ago??). It was your basic glassed on fiberglass thruster fin with a small slot foiled into it. All three fins would be slotted in a basic thruster setup. I never had a chance to ride one that I remember??? But, I did look many over and they appeared functional. I don’t remember any feedback from people that rode it…but then again my memory has never been the best. -g30
I remember that Hamish Graham used this type of fin for a while on his > boards when he was shaping Byrning Spears out of Santa Barbara (about 10 > yrs ago??). It was your basic glassed on fiberglass thruster fin with a > small slot foiled into it. All three fins would be slotted in a basic > thruster setup. I never had a chance to ride one that I remember??? But, I > did look many over and they appeared functional. I don’t remember any > feedback from people that rode it…but then again my memory has never > been the best.>>> -g30 I just ran up the street and spoke to Hamish about the slotted fins. He said they worked great on his channel bottom guns. They were just hard to get glassers to deal with all the extra detail work. Hamish said that they had more bite than unslotted fins. The theory is that the slot pops the turbulence bubbles.
is a well known and heavily researched phenomenon on sailboats. Of course it involves the gap between the jib and main sails but I’m sure we’ve all thought about the similarities between aerodynamics and hydrodynamics. It’s not much of a reach to apply the same principles to fins.
is a well known and heavily researched phenomenon on sailboats. Of course > it involves the gap between the jib and main sails but I’m sure we’ve all > thought about the similarities between aerodynamics and hydrodynamics. > It’s not much of a reach to apply the same principles to fins. … I’ve tried slots at least a dozen times.For me they tend to work well in smaller stuff,but found that in bigger waves they actually caused more outboard drag.Even when they did work correctly they didn’t have nearly the same enhancements that the Superchargers do.Herb.
I know this is a very elementary question… I am new here, but could someone fill me in on what exactly a supercharger is? Thanks, and sorry to pester you with easy questions.
While I’ve never tried the “slot fin”, I wonder if the gap between the main side fins and your superchargers mimic the “slot effect” of jib and main sails on boats?
I know this is a very elementary question… I am new here, but could > someone fill me in on what exactly a supercharger is? Thanks, and sorry to > pester you with easy questions. Go to the archives lots of info. on the Supercharger,In short it’s a evolved C-5.Herb.
While I’ve never tried the “slot fin”, I wonder if the gap > between the main side fins and your superchargers mimic the “slot > effect” of jib and main sails on boats?>>>>>>>.BINGO!!!John.That’s why my set-up is different than Rusty’s ,because the charger’s trailing edge(appears) runs into the main outboard fins like the angle on a jib sail.Herb.