Bumpy Leading Edge Foils that is?
Like this,
I’m sure I read about this here, years ago, but search is being uncooperative.
( more detail here, http://www.tda-ri.com/bleftechnology.html )
Roy Stewart
yup Roy is…
one of the guys on the ERBB did it to some of his fins.
IIRC he liked it but thought it wasn’t worth the work.
hi gadgetman !
yep , ’ Wildy ’ was , in the past …
here ya go , mate !
http://www.swaylocks.com/forums/line-and-fin-designat-last
Really? Oh dear!
I thought he was all hoop fins.
Did find a few mentions here, http://www.swaylocks.com/groups/fin-theorytomhalycon-and-others?page=10
but not much.
I tried it on a 10" longboard fin but to be honest I didn’t notice any difference, good or bad. It was a narrow-based fin, though; so I don’t know how much room for improvement there is in those to begin with.
Couple more links and a whole mess of Page Not Founds
http://www.swaylocks.com/forums/tubercle-fins
http://www.swaylocks.com/forums/whale-tubercle-concepts-marketplace
IIRC I saw it on one of Roy’s hoop fins too
I’ve been thinking about the tubercle foil for a while now too. Seems like lots of work for little return though. This is what I’ve seemed to find from looking around on the internet while I should’ve been working ;) The tubercles do reduce drag by a small percentage 5-10 ish. I think it’s mostly tip drag and tip vorticies reduced in combination with keeping the flow attached. This is why they use tubercles on wind turbine blades. They have better results at lower speeds or increased angles of attack so more flow attachement. A heck of a lot more effort to make though unless you have a cnc mill. Also not sure what the varying fin thickness would do to the fin flex. Just my few thoughts.
one guy is kinda into them 
I was thinking it was the increased stall angle that was of most application for surf fins. Most NACA stall out at 12 - 15 degrees, they’ve made BLEFs that stall at 27 degrees! (and a soft stall at that). Maintaining drive in harder turns, less spinning out (but I guess tailslides are kinda fashionble right now).
and …
…who is ’ L.V.’ …please tell ?! …
is it , for instance , sway’s LeeV , the moderator ?
What was L.V.'s comment on how they go , please ?
by the way , speaking of fins …HAVE you ridden those "wavefins " that you were sent , from a year or two ago , yet ?
[ some of the new model ‘wings’ that he recently sent me , have ridges in them , a bit like these ‘tubercles’ thingies …only horizontal of course , not vertical ! ]
cheers !
ben
what were they bitchen ’ about , john ?
I hate it when fins COMPLAIN ! were they humming at you ?? 
linguistic joke aside ,
HOW did you like how they rode ?
cheers
ben