Severne Dyno 95L

I've spent quite a bit of time on my Dyno 95 now and I have a few notes to add to the stuff already said.
Firstly, it's a lovely board and I'm getting even more out of it the more I use it. and it seems very happy in a big range of wind conditions.

But there are some odd things too:
The board planes early but it slogs best when you are out of the straps and standing well forwards, because of the volume distribution and rocker line. In that position the board will start to come up onto the plane as the wind increases, but you get there a lot quicker by popping the board and getting your front foot in the front strap asap. If you stay too far forwards you actually slow up the early planing release.

I find the board sets up best for me if I set my mast foot well back in the track, and a single bolt deckplate allows you to do that. I find this to be the case with all the 4m, 4.4, 4.8 and 5.0m sails used so far.

I had a suspicion that the 95 was overfinned for some of my size (75kgs) and I was right. I replaced the supplied 20cms centre fin with a 17cms K4 one and the improvement was immediate. The board seemed quicker to plane, and it loosened up on the wave face - whilst still having plenty of 'push' for the back foot.
I may yet try smaller thruster fins as well. I write this as someone who always likes to use small fins.

With the supplied fin set up I did find that the board will start to tail walk in windy weather - but only when I'm using the 95 with a 4m sail, and that's a sail size where you'd expect to be on a smaller board anyway.
As it is, I like the Dyno 95 so much that if I had the money I'd be keen to get an 85litre version too.

Dyno 115 L - I use the stock fins for 6.1 and 6.7 in small waves. I'd use the same set up in bigger waves but we only get small waves in Florida. ??

38 cm freerace fin and 7.5 on flat water.

Basher - did you not go for a Nano 2 in the end? Keen to understand thought process as I am also a South Coast UK sailor looking at these boards. Thanks!

Basher

would be great to understand your thinking on usage of Dyno85 vs Nano82. I have a dyno105 and thinking about adding Dyno85 as a "fast wave board" for uk conditions. I am not an experienced wave sailor and am 80kg

Super helpful - thanks!

the 2020 severne boards now made by cobra ...not china anymore...still made in the same construction ?

thanks in advance

Fin tuning.
I ordered a 16cms fin yesterday. It's a K4, stubby rear, 16cms long and with a powerbox head.
This will be similar to the 17cms version I already use all the time in my Dyno 95, but the 16cms is for the Dyno 85 I just bought.
I already tried the 17cms in the Dyno 85 on the three times I have sailed that board, and realise I could go smaller.

This may seem odd to some of you, when Severne themselves have actually increased their centre fin lengths for the 2020 Dynos.
So here's my reasoning:

1) Firstly, the fin area and fin lengths you want in any board depend on what you want to do with the board. The Dyno is a freewave and a crossover board in that it can take very big sails, for blasting use or even wave slalom. The fins supplied by Severne are very good and they allow you to do just that. You can easily use a 6m rig in tri fin mode with these fins.

2) But the Dyno is actually a very good wave board, especially in the 95 and 85 sizes. You can tune it to be an even better wave board and for better turning, simply by matching the fins to sail sizes used. Wave sailing usually happens with sails of 5m or less. I find with smaller fins there is no loss of early planing or upwind ability, and even when using a 5.3 rig I've had no issues with spinout.

3) Changing the centre fin is the simplest and cheapest way to reduce fin area, because you only buy one new fin - and changing a powerbox fin is pretty quick if you later want to change back. The two thruster fins that come with the Dyno boards are good, if a little big at 12.5cms.

4) When changing a single fin, we usually just talk about fin length but of course the fin width also adds to the area underfoot. With multi fin boards we should really compare total area when considering a change, but few manufacturers give that fin area. What I tend to do with a tri fin set up is to add up the centre fin length and the thruster fin length and see how that compares with a single fin length. So the Dyno 85 and 95 come with a 21cms fin and 12.5cms thrusters for 2020 and those two figures add up to 33.5cms. A 33cms fin is something I might use with a 7m+ sail, so my argument is that that's way too much for wave sailing on a 4.8m rig. My science is a bit dodgy here, but I hope you get my point - namely that it's easy to over-fin a multi fin board and you might not notice until really overpowered.

5) The 17cms fin worked straight away when I fitted it to the Dyno 95. 17 + 12.5 = 29.5 so that's still plenty of area, and the biggest sail I use on that board is a 5.3m. For the Dyno 85, I will soon be using it with 16cms centre fin, so that's 16 + 12.5 = 28.5cms.

6) I'll probably use my Dyno 85 with sails from 5.0 down to 3.6m and the smaller fins are almost essential for the smaller rig sizes. If you stuck with the big 20cms+ centre fin then the board would start to tail walk in 4m or even 4.4m weather - just like single fin boards do.

7) By reducing the centre fin only, you also change the cluster area, with less area at the back - so the tuning effect is also to make the board much looser because, in addition to less fin area, you've also shifted the cluster area forwards. If there's a downside, it's that the board will be less 'drivey' and that might not suit you if you are heavy on the back foot.

8) As I see it, this simple change takes the Dyno out of 'freewave' territory and makes it a proper waveboard, capable of waveriding, almost as good as a dedicated down the line board. For onshore conditions, this board is as good as it gets.

9) My further tuning tip - for those wanting better wave performance - is to shift the mast foot well back in the track when using any sails of 5m or less. This brings the mast foot back closer to the fins and makes the board much more lively for early planing etc. With a single bolt deck plate I'm using both my Dynos with the mast foot right at the back of the track for all sails. Only when I'm overpowered do I think about moving the deckplate forwards and maybe nearer the centre placing - for a bit more control. The front half of the track is completely redundant on my boards.

10) All the above points cover tuning issues - and tuning is always about personal preferences. So the experimentation is really down to you. I'm just telling you what I'm doing, and why. The Dynos are very plug and play, as supplied, so no reason to change the board if you are happy with yours already.

You weren't wrong about the 17cm rear fin for the Dyno Basher. Made a 3D printed powerbox adapter for the 17cm rear fin out of my Nano to see if it worked for me and holy moley what a difference. I think for larger guys on 5+m sails the stock fin is still a great option but at 70 kg the smaller fin made the Dyno faster and smoother and to my surprise planes earlier and points higher. The bit of extra speed helps with jumps too, best forwards so far on it. Can't wait to try it in the waves.

3D printed adapter isn't very strong so going to mold a permanent Powerbox head on it since I only use my Nano as a quad anyway.

Hello guys I've a question for one of my friends: for a man of 72-75 kg, good level in on-shore bump and jump conditions, (speed loop, fast, and strong in overpowered conditions) sail from 3.6 to 5.2 it is better the 85 or 95? He also use a new Nano 82 for nice days.
Thank a lot

Sounds about right.
Applies to other company FSW trips also.
My 92 fsw comes with 10's in front, so needs 20-22 small area rear single.
Needs more as a single fin board.

Oooh.

The Severne Dyno new versions just arrived in the UK, with the red livery.

I'm not in a hurry to replace my existing Dyno 85 (favourite all round board) or my Dyno 95 (light wind wave board), but I see the new Dyno has a tweaked shape with a pointy nose.

But the big news for me, which I've only just noticed, is that they are doing a new, smaller size, at 75litres.
Tempting.

I'm itching to try the 125 out! Who needs wind with that much floatation!!?? I appreciate it's only 5cm wider than my much- loved 115 but hey that's 10l of extra float limping out to the windline, in the big lulls the SE throws up here and for uphauling when there is a nagging suspicion you're in croc country! 115 great, let's see what the 125'll do!!