Forums > Stand Up Paddle General

Fins

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Created by stehar 28 days ago, 30 Jan 2020
stehar
NSW, 285 posts
30 Jan 2020 9:13PM
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Arrived today - try out tomorrow on Woolgoolga lake - into surf next week

pete53
NSW, 176 posts
30 Jan 2020 10:16PM
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What board are they going on?

stehar
NSW, 285 posts
31 Jan 2020 9:19AM
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Board is a custom blue planet - quad only - the " Jimmy Lewis quad converted me! Brilliant board but too small for me inthe end ( very tiring ) this is a beefed up version and is ideal for fast semi close out beach breaks. Steve

DHUPEDNORTH1
94 posts
31 Jan 2020 10:31AM
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I believe a quad set of Quobbas is not too far off now (been using a top line specialist in quads to assist in development apparently - they only do things properly so these things take time). And they're loving working with the SUPers, happy to split sets (e.g. for the JL riders), have a chat to them, love their keenness for innovation and to try new things/set ups, etc. They have a real interest in SUPs now considering the company was originally started some years ago by shortboarders (proners) for shortboard fins.

stehar
NSW, 285 posts
1 Feb 2020 11:48AM
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The Quobba fins measure 113mm deck to top - the back set measure 110mm deck to top { height } Is it necessary to have much smaller back fins - what effect will my setup have on performance?

Just noticed that most quad setups have smaller back fins!

Steve

colas
3657 posts
1 Feb 2020 3:38PM
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Select to expand quote
stehar said..
what effect will my setup have on performance?

Just noticed that most quad setups have smaller back fins!



In my experience (and Tom Carroll also mention it in a video), SUP quads need smaller back fins than what is used on prone shortboards. I guess because SUPs have longer and heavier, and bigger rear quads will stiffen the board too much: the board will tend to track. For instance I used L or XL fronts with S rears, or even twin fins in front with trailers as rears.

Basically, in your turns, if you understeer, you need a bigger difference between your front & rear fins, and the opposite if you oversteer.

The exception is very short (about less than 7'6") and light SUP boards, and if you can put your rear foot locked between the kick & arch on the rear pad in top turns, then you can use rear quads as big as the prone shortboard ones. I thus can use quobba L fronts with Quobba M rears on my 6'10" small wave board.



Also there are 2 type of quads: the ones with the rears close to the front ("edge fin"), which can handle bigger quads, and the most common ones, the McKee setup (as on my pic above), where they are closer to the central fin of a thruster, where they can be quickly overfinned.

stehar
NSW, 285 posts
1 Feb 2020 10:02PM
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Thanks Colas



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