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Curtis fins 60 vs. 70

 
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raffar



Joined: 23 Dec 2007
Posts: 47

PostPosted: Sun Jun 28, 2015 10:50 pm    Post subject: Curtis fins 60 vs. 70 Reply with quote

Hi all,

I'm trying to figure out which fin size shall I use:
Curtis 60cm Race vs Curtis 70cm Race
Why would you use one instead of the other?

Setup:
Lake (mostly) flat surfing, generally 10-20 knots
Starboard formula 156.
Sails Aerotec 9.0, Maui 8.0

RAF
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joethewindsufa



Joined: 10 Oct 2010
Posts: 1138
Location: Montréal

PostPosted: Mon Jun 29, 2015 5:19 am    Post subject: Reply with quote

60 for the 8 and 70 for the 9 ??
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d0uglass



Joined: 28 May 2004
Posts: 1275
Location: Bonita Springs, Florida

PostPosted: Mon Jun 29, 2015 9:14 am    Post subject: Reply with quote

70 cm is a better all-around choice for early planing and good upwind on a 100 cm wide formula board. You need a lot of lift from the fin to get that wide board to trim right.

60 cm would be OK in 15+ knots with smaller sails, but even then it might feel a little funny.

I'd get the 70 cm to start with, then try the 60 if you feel like you need more control in high winds.

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manuel



Joined: 08 Oct 2007
Posts: 1102

PostPosted: Mon Jun 29, 2015 9:50 am    Post subject: Reply with quote

Sailed this exact combo for years, awesome light wind freeriding.
For my 160lbs the 70cm had too much lift and associated drag.
Used a 60cm up to 9.2 and it was wonderful!

For 9.5 maybe 64cm, I'd keep the 70 for 10.5+
Now if you weigh closer to 200lbs then it'd make sense to increase fin length.

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coachg



Joined: 10 Sep 2000
Posts: 3059

PostPosted: Mon Jun 29, 2015 11:26 am    Post subject: Reply with quote

+1 to what Manuel said.

You have the older formula board with the narrower tail. Free sailing with 8.0 & 9.0 under 20 mph 60 cm will be plenty unless you are a really big guy or are needing super high angles for some reason.



Coachg
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techno900



Joined: 28 Mar 2001
Posts: 3900

PostPosted: Mon Jun 29, 2015 12:12 pm    Post subject: Reply with quote

Also depends on your weight. The Drake 70 is OK in lighter winds, but it doesn't have much range. If you need the 70 to plane, fine, but if there is enough wind to plane with the 60, then that's your call. This assumes you are not racing.
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DanWeiss



Joined: 24 Jun 2008
Posts: 2288
Location: Connecticut, USA

PostPosted: Mon Jun 29, 2015 1:41 pm    Post subject: Reply with quote

70 to maximize upwind and downwind power and angles. 60 is fine if just beam reaching very powered up.
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raffar



Joined: 23 Dec 2007
Posts: 47

PostPosted: Mon Jun 29, 2015 11:57 pm    Post subject: Reply with quote

Yeah I'm just past the 200 lbs mark Embarassed
Maybe it'll explain why I haven't had too much issues with too much lift on the 70.

Thank you for the tips. I will keep on trucking with the 70 and reserve the 60 cm for windier days.

RAF
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joethewindsufa



Joined: 10 Oct 2010
Posts: 1138
Location: Montréal

PostPosted: Wed Jul 01, 2015 8:15 pm    Post subject: Reply with quote

and i am past the 230 mark Embarassed
reason for my suggestion Sad
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Sailboarder



Joined: 10 Apr 2011
Posts: 656

PostPosted: Fri Jul 03, 2015 6:19 am    Post subject: Reply with quote

You might also find that the chop level will influence your choice. If water if flatter than usual, you'll go faster and any fin will generate more lift. You might then like better your 60 instead of the 70.
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