superchargers

[red]

Anybody had experience with placing small fins (1"x1") ahead of rail fins?
http://i87.photobucket.com/albums/k143/ ... 1171677553

They are called superchargers and attributed to shaper Herb Spitzer. They are meant to loosen up the board while improving directionality.
Some serious thought behind the concept that relates to the turbulence at the fin base/board boundary.

Before youse smarties come up with it - I know 4 fins leverage off the similar concepts.

Further reading:
http://www.swaylocks.com/forum/gforum.c ... ead#unread

[Bob]

Ask Rainbow for the front fins for a twinzer set up. Put them in the box right next to your larger side fins.

So much faster than a traditional tri fin.

Something about guiding the water across the bigger side fins and stopping turbulence across the fins.

Not for huge waves.

I ride a Mark Richard's "super twin" set up with the two front fins added for surf up to double overhead. It is like a Rusty C-5 but uses twin fins with a small trailing fin instead of a thruster cluster.

Tri fin with smaller back fin for large surf or a really heavy wave.

[hart]

[albumimg]1461[/albumimg]

this board was shaped in 2003 using an influence from John Ware c 1978

transition thru tradition

all cool

hart

[scoop]

Red
Are you coming up to Bendalong next month?????
I have the board Bruce is talking about and have had since he kindly lent it to me for Coff's 04 ....I loved it so much I rang him after the comp and negotiated a price
I can bring it along for you to peruse ... even try!!!
cheers
Tony

[Bob]

Those are the exact fins on my board except the back one is smaller on mine.

One board has the front four fins like this. The other has more overlap in the front fins.

Cannot really tell the difference.

Both boards are fun.

[KneeBumps]

Never heard them called "superchargers: before this (but I did go back to the Swaylock's forum and read thru). I have always seen them called canard fins, after aerodynamics lingo- small fins placed forward of larger ones (wings on a jet) to alter airflow across the larger fin/wing. It's an old concept in areodynamics and lift. You can Google 'canard' and read all night on the theory.
MNot sure if that's what make my twinzer fly, but it does...

[red]

Thanks for the responses
May tack some onto my midday flier - it's too fast and drivey for most conditions, but I hate the idea of a small back fin - makes top turns sooo draggy...

Yeah Bruce, I remember that board. Couldn't remember the fin settings, though - I thought the leaders were 100mm or so in front of the rail fins. Interesting that these loosen up the board. Does this mean you pushed the wide point forward in that outline?
Thanks for the John Ware reference.

Scoop - love to do Bendy, mate, but just can't do it. Looking at Coffs with a new quiver.