# twin-fins fin placement

I’ve made a 6’0"x20"x2"3/8 mushy wave weapon inspired to Rusty’s CATFISH but with a wide squash tail which I wanted to put only 2 fins on: what’s the angle and distance from the tail and from the outline?

I’ve made a 6’0"x20"x2"3/8 mushy wave weapon inspired to > Rusty’s CATFISH but with a wide squash tail which I wanted to put only 2 > fins on: what’s the angle and distance from the tail and from the outline? Are you using traditional glass on twin fins (taller with wider fin base) or some other type of fin system? The further forward you place your fins toward the nose the looser the board. Traditionally a twin placement is around 9" from the tail compared to about 11" on a short board. As far as how far you place them to the rail and at what degree it’s personal pref. I like them far enough out to the rail when tipped at 4 degrees the tops of the fins are right in line with the rail line (when you look straight at it from above). I am sure that Herb or Dale can give you much more detail than I.

Being that it is a squash tail instead of a swallow you will lose a little positivity. Go with 7.5" up from the tail to the trailing edge of the fins. toe = to the nose cant = @ 5 or 6 degrees And set them 1-1/2" off the rail(from the rear of the fin ,that is).Herb.

Herb: I was out in the shop pondering this on a 7’ twin. On a split tail design twin, what are the critical parts to the formula for fin placement. I’m using 1.5" off the rail for most of my twin/fish types. Toe has been fixed at 1/4" from the trail edge to leading edge off stringer. The distance from tail tips to trailing edge of fins I’ve varied from 8.25 on a 6’2" to 10.0 on a 7’2". Am I right in thinking that this placement from the tail will vary with the length of the board? (further back=more drawn out turns=larger turning radius, further up the radius is reduced=short arc turns) Where does the offset from the rail come into play and how will 1/4" incremental changes, maybe to 1.75" play into this picture? I know, I know…what I need to do is just set a bunch of plugs and try it. (better yet, a couple of RedX boxes to allow for these on the fly changes). Thanks! Tom>>> Being that it is a squash tail instead of a swallow you will lose a little > positivity.>>> Go with 7.5" up from the tail to the trailing edge of the fins.>>> toe = to the nose>>> cant = @ 5 or 6 degrees>>> And set them 1-1/2" off the rail(from the rear of the fin ,that > is).Herb.

Tom The more to the rail you go, the more edgy the board becomes,it will also hold in better thru turns and in the vert… …By putting them in closer to the center, they become more pivoty(like a single),and rides flatter. Alot varies on fin size,distance,tail width,tail thickness,swallow depth, toe,and cant,fin rake,base length vs. fin height,a little bit can make alot of difference at times. YOU ARE CORRECT ON PLACEMENT VS. BOARD LENGTH AS WELL AS DISTANCE FROM THE TAIL…Aloha,Herb.

Tom>>> The more to the rail you go, the more edgy the board becomes,it will also > hold in better thru turns and in the vert…>>> …By putting them in closer to the center, they become more > pivoty(like a single),and rides flatter.>>> Alot varies on fin size,distance,tail width,tail thickness,swallow depth, > toe,and cant,fin rake,base length vs. fin height,a little bit can make > alot of difference at times.>>> YOU ARE CORRECT ON PLACEMENT VS. BOARD LENGTH AS WELL AS DISTANCE FROM THE > TAIL…Aloha,Herb. I gotta ask…How does what you and Tom just said hold up when you add Spitzer chargers to the fin setup, especially re holding in on steep faces, take-offs, pivoty turns vs. edgy turns, etc.? I’ll take my answer on the web! Also Herb, not to be pushy but…I’ll take the larger chargers as soon as you have time. Much aloha in this. malama pono, nib

I gotta ask…How does what you and Tom just said hold up when you add > Spitzer chargers to the fin setup, especially re holding in on steep > faces, take-offs, pivoty turns vs. edgy turns, etc.? I’ll take my answer > on the web! Also Herb, not to be pushy but…I’ll take the larger chargers > as soon as you have time. Much aloha in this.>>> malama pono, nib…It’s really kind of simple to answer…it will ride like a twinnie…on steriods.It will hold up in vertical better,it’s faster,looser,more positive,and will also paddle better,catch waves earlier,tube ride better,…sounds to good to be TRUE, even to me!!! but THESE ARE WHAT I found to be true of the Superchargers.>>>I just got back from the post office, John Mellor,Zeek,and your sets(NIB) are in the mail. I HAVE BEEN DIVERTING CHARGERS AROUND TO FILL A DEMAND THAT I WAS NOT PREPARED FOR. Swaylock’s Mike was to recieve a set of 2"x 2" but I ran out,so I am sending you a set of “old schools” for the time being ,these will work for thrusters or 2+1 type set-ups or keep them as a gift to you for all your generosity you have given us by providing this site…IN TIME: I plan on making a framed display of the entire collection of Superchargers for you,Thanks Mike P.>>>I have an ace up my sleave that just might push this over …BIG TIME!!!Crafty Herb.

what is the placement for a Twinzer setup? I have my rear fin 1 1/2" over from the rail and 8 3/4" up. The little twinzer fin is over 1 1/2" and up 11 3/4". The fins all have 1/4" toe too. All this doesn’t look right ot me on my board. I am puttinf fcs in and the plugs are kinda close. What should I do

i’ve made a 5’ 6" swallow tail, with the intention of making it a twin fin, possibly with a smaller trailer fin option, fin placement has me stumped, especially whether to measure from the true end in between the swallow points or from the stringer in the v?

i’ve made a 5’ 6" swallow tail, with the intention of making it a twin fin, possibly with a smaller trailer fin option, fin placement has me stumped, especially whether to measure from the true end in between the swallow points or from the stringer in the v?