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Fin sizing for twin fin board

 
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photodad2001



Joined: 21 Sep 2010
Posts: 22

PostPosted: Fri Sep 08, 2017 5:28 pm    Post subject: Fin sizing for twin fin board Reply with quote

I just got my hands on a HiFly Madd 165. I bought this board to use in light wind and specifically in Hatteras with light wind. It came with 2 29cm pointer fins, but I want to put some True Ames Surfgrass fins on it. I plan on using my 7.0 Ezzy Cheetah up through my 9.0 Aerotech Freespeed. Will one set of fins do it or do I need 2 sets? I was thinking of getting a pair of 22cm True Ames Surfgrass fins and leaving it alone. Will this be enough for the 9.0?
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isobars



Joined: 12 Dec 1999
Posts: 18234

PostPosted: Fri Sep 08, 2017 7:06 pm    Post subject: Reply with quote

Don't forget to consider the area of those Surfgrasses. They are labeled by length, but that doesn't consider their span. I have several brands and models of weed fins, and for a given length, such as 23 cm, my Surfgrasses are MUCH bigger fins than my other models, especially the MFC San Carlos fins. Nothing wrong with that, but we need to consider it.
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U2U2U2



Joined: 06 Jul 2001
Posts: 4324
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Sep 10, 2017 9:53 am    Post subject: Reply with quote

I sail in OBX. ACCORDING TO MAUI ULtra FIN, MUF, the increase from a single fin TO A TWIN AREA SHOULD BE 1.33% of the area of a comparable single.

Without doing that my estimate is twins of 23--26cm.

I suggest a pair of K4, SUP RACE FINS IN 24cm, available from 4Boards in UK.

PM me if you need help.
CNC FINS, designed for Hatteras and beyond would be a great option, email Keith.

You may look for RRD twins in a similar size board, some past topics on here or google as well, lots of info / opinions.

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K4 fins
4Boards....May the fours be with you

http://www.k4fins.com/fins.html
http://4boards.co.uk/
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dennis_c



Joined: 05 May 1998
Posts: 841
Location: Rio

PostPosted: Sun Sep 10, 2017 11:51 am    Post subject: Reply with quote

I have to call "oopsy" on the K4 SUP fin recommendation. I'm pretty sure that Hifly Madd came with power boxes.
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isobars



Joined: 12 Dec 1999
Posts: 18234

PostPosted: Sun Sep 10, 2017 3:51 pm    Post subject: Reply with quote

I just saw some great-looking, ultralight, carbon weed and regular SUP wave fins by Black Project. They were FAR less pricey that their G-10 WSing counterparts, so the shop emailed BP and asked if SUP fins made suitable WSing fins. As I suspected, they said, "No way. The foils are very different due to the speed differences." Seems incompressible fluids are very picky.
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U2U2U2



Joined: 06 Jul 2001
Posts: 4324
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Sep 10, 2017 4:31 pm    Post subject: Reply with quote

dennis_c wrote:
I have to call "oopsy" on the K4 SUP fin recommendation. I'm pretty sure that Hifly Madd came with power boxes.


I failed to recognize that, minor detail..lol.

The shallow water Fin made for Dutch sailors will be available soon from K4.
Called Tide.

_________________
K4 fins
4Boards....May the fours be with you

http://www.k4fins.com/fins.html
http://4boards.co.uk/
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U2U2U2



Joined: 06 Jul 2001
Posts: 4324
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sun Sep 10, 2017 4:33 pm    Post subject: Reply with quote

isobars wrote:
I just saw some great-looking, ultralight, carbon weed and regular SUP wave fins by Black Project. They were FAR less pricey that their G-10 WSing counterparts, so the shop emailed BP and asked if SUP fins made suitable WSing fins. As I suspected, they said, "No way. The foils are very different due to the speed differences." Seems incompressible fluids are very picky.


I use the K4 sup race Fin on my windsup, when planing on rare occasion, it feels just peachy.

_________________
K4 fins
4Boards....May the fours be with you

http://www.k4fins.com/fins.html
http://4boards.co.uk/
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U2U2U2



Joined: 06 Jul 2001
Posts: 4324
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Sep 11, 2017 9:20 am    Post subject: Reply with quote

K4 Tide fin, will be too large , 28/30/32 only.
_________________
K4 fins
4Boards....May the fours be with you

http://www.k4fins.com/fins.html
http://4boards.co.uk/
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lturkevich



Joined: 11 May 2000
Posts: 57

PostPosted: Mon Sep 11, 2017 1:03 pm    Post subject: Reply with quote

I use a pair of 10 inch (25.4cm) Wardog Freeweed fins (same profile as the SurfGrass) on my 135L Madd. Used this combo many times in Hatteras w/ my Retro 9.0.

I weigh 185 lbs, so the 22 cm fins might be a bit small for you.
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