I've had some discussions with various people over the validity of aerodynamic and hydrodynamic comparisons. Some say that air and water are both fluids in a sense but others say air is a gas and no comparisons are valid. I like to think that comparisons are indeed valid but necessarily directly.
In any case, I often think about the similarities of twinzer designs and my own experiences with sloop rigged sailboats which use the slot effect. With the sails, there is a definite relationship between the main and the jib which can be altered dramatically by changing the shape of the foils and the distance between the sails.
Here is one guy's attempt at explaining what's going on. It is part of a much bigger site that examines other aspects of boats which may or may not relate to surfboard design. I leave that to the reader to decide. Also note stuff on composites... http://www.arvelgentry.com/magaz/Another_Look_at_Slot_Effect.pdf http://www.sailboat-technology.com/links/online_articles.php
I can't take credit for the board, I picked it up in San Diego. Shaper is Chris Herel, I've only seen 1 other board like it in my life. I'm actually going to try and copy it, I just haven't gotten around to shaping the 4 blanks I have in the garage.
I personally love the way it surfs, much faster than my thrusters while holding much better than a traditional twin.
There's one! Is that one you did, Blt? Have you any ride reports? That's more the thing I was talking about with the multi-element deal--you'd have to have significant interaction there!
I have two Hynson twinzers. Fastest boards I've ever ridden. Fastest boards at this length I've paddled. Fun.
Got any (lots of) pics?
...i used to love riding my 'Bushfire fish' with small front side fins and bigger back fins . With the abundance of side plugs on that , and the 'prawn' , i could move the side fins closer together or further apart , especially when using 'one tabber' side fins ....
i'm thinking , when my 6'5 byrne [thruster] and the 6'4 [thruster] blank are finshed , an extra side plug or two , will allow me to try the twinzer setup on those , for a [non-'fish' template] comparison ....
[now i'll go and try to find the original will jobson twinzer photo that i posted here so long ago [wish me luck] ]
....there are some 'twinzer' type setups photos in some of these threads , too, by the way ....
will jobson and the twinzer ...
...and , there are a couple more here ... http://www.swaylocks.com/forum/gforum.cgi?do=post_view_flat;post=214840;page=1;mh=-1;;sb=post_latest_reply;so=ASC
[the blue tint ones held in really well . i like the front side fins at half the size of the back side fins ...]
own a Larrry Mabile 6'6" twinzer, shaped for Kane Garden.
came with the FCS fin set that Larmo designed for the board. I switched out the small, single-foil leading fins for
double-foil fins that are the small trailer fin in a FCS MRX set of fins. the change was noticeable and improved the boards turns.
the board flies fast and turns on a dime. works well all over the San Mateo Point area and surrounding wave zones.
the board changed my surfing life last year, and I would consider another one [maybe go to a 6'4"] in a heartbeat. Larmo shapes nice boards!!!
will jobson and the twinzer ...
photo peter brouillet , from ? the 1980s? surfing mag ...
i'll see if i can locate the original [short] accompanying written piece to go with it