Obviously to get even higher speeds we could jump to smaller boards again , but I am interested :

What what maximum speed ever achieved on my everyday Isonic 97 liters ?

with
7.0 m2
6.2 m2
??
At this moment I am pushing my gear at about 33 ktn , and see some other guys do 37-38 safely.

What is the upper limit?

I would imagine that depends what conditions it's sailed in and who is on it but I'm sure in the right conditions it can go a bit faster than 33.
If some sailing freaks can get a 137ltr board up around 40 in not ideal water states then the sky is the limit with that 97.

If you are a 100 kg or so you can push a 100 lt slalom board to 40 knots - just need good strong wind and flat water. its more to do with the fin than the volume of the board. a good fin will lift most of the board out of the water - smaller boards are just easier to lift and are more forgiving on tail walks.

Generally you want to use the smallest fin that you can find that will have enuf power to stop the wider board from sliding to reduce drag in the water.
for speed off the wind you can get away with a lot smaller fin than if you are reaching upwind.

Due to our wind conditions on GC , I need volume to go trough the lools before could reach speed bank.
Speed board will sink before I get to the place, most times. So I try to use IS97 and find our how fast I can go without loosing control in stronger winds.
Same speed around 33 feels quite scary on IS but completely harmless on smaller boards, but it could be my lack of experience.At one time when approached 33 ktn and strong gust come, that I was in position and prepared, instead of actually converting into extra speed - gust lift me above of the water sideways .

Still learning so wanted your advice how fast we could push the most popular Isonic 97 Liter safely before need to switch for smaller speed board.
I am 85 kg.

I have a the 2014 Iso 97 wood. I have consistently got 36's and 37's on it with 7.0m and 7.8m Reflex 4 sails the fins I use are 36 and 33 cm Carbon Vector Volt fins. My best is 38knts with a 6.2m and 30cm fin.

IMHO the trick to getting bigger boards to go quick is through tuning and trim settings. Set the mast base all the way back and then set your boom height so that when sailing broad you are almost tailing walking but still in control. Only when the you are just keeping the "Fin wet" will you hit the high 30's on the bigger kit.

Yep its good for 40+

gpsteamchallenge.com.au/sailor_session/show?date=2015-07-13&team=11

macro brad gets 40 all the time leo and i got 37s yesterday I can see where i messed up and cound have done faster . At 37 knots the board doesnt feel to big or anything i recon a 97l and a 7m sail is the best alrounder here and its all i own

Peter its in the bare off I saw you yesterday I only saw you going across the wind you have to go off the wind.
Check out others tracks on KA you will see.

I agree Simon, that the best board I ever had.

Do you recommend also 33 cm fin to get around this 37 knots on 7.0 ?

At this moment I use 36 cm that feel very comfortable and doesn't spin upwind, but I feel I could go faster down wind with smaller fin.

I've hit around 35 on mine with a 6.7, but I have never had it fully powered up in flat water and I am a light weight. When I hit the 33-35 mark, the board feels nice and in control and I feel with more wind, 40s would be doable.

Macro I haven't seen you sail but I'd guess Glynn's onto it, it's the bear off. Try chasing one of your local guns and bear off with him. I don't have that board but I'd think a 36 fin might be a bit big bearing off chasing speed, someone else can say.

I've managed 39.5 out of my 95L CA slalom and a 5.8 Switchblade, but that was at Lake George, flat water helps too

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firiebob said..
Macro I haven't seen you sail but I'd guess Glynn's onto it, it's the bear off. Try chasing one of your local guns and bear off with him. I don't have that board but I'd think a 36 fin might be a bit big bearing off chasing speed, someone else can say.

I've managed 39.5 out of my 95L CA slalom and a 5.8 Switchblade, but that was at Lake George, flat water helps too

39.5 at Lake George... Cmon Bob.. the chop that day was massive!

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red said..

firiebob said..
Macro I haven't seen you sail but I'd guess Glynn's onto it, it's the bear off. Try chasing one of your local guns and bear off with him. I don't have that board but I'd think a 36 fin might be a bit big bearing off chasing speed, someone else can say.

I've managed 39.5 out of my 95L CA slalom and a 5.8 Switchblade, but that was at Lake George, flat water helps too

39.5 at Lake George... Cmon Bob.. the chop that day was massive!

I remember you were also on a slalom and went a little faster, bastard
See you next year, somewhere Oh and look out, I've got one of those rubber things now

Thanks Glynn, next time I will keep close eyes on your tracks and try to follow. Your 37.2 was amazing on that day.

gpsteamchallenge.com.au/sailor_session/show?date=2015-08-04&team=27
38 .119 for me. Man that board is so fast and has got more in it as B Rad found out.

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Bender said..
I have a the 2014 Iso 97 wood. I have consistently got 36's and 37's on it with 7.0m and 7.8m Reflex 4 sails the fins I use are 36 and 33 cm Carbon Vector Volt fins. My best is 38knts with a 6.2m and 30cm fin.

IMHO the trick to getting bigger boards to go quick is through tuning and trim settings. Set the mast base all the way back and then set your boom height so that when sailing broad you are almost tailing walking but still in control. Only when the you are just keeping the "Fin wet" will you hit the high 30's on the bigger kit.

Got a question on tune/trim on my ISO97. I find that I normally put the base a little forward of the recommended position (painted on mast track), and I run a lower boom than most, and probably shorter lines than most (and a higher hook type seat harness). I don't know if I have a strange body proportions, but I find if I move the base back, I can hardly keep my front foot in the strap and put almost all my weight on the back (and the front foot can get knocked out easily by chop). I find it quite uncomfortable. I can counter this by lowering my boom, which seems to get me forward on the board (as mask is raked). Not sure what I am doing wrong, but I cannot get well balanced in my stance unless I put the base forward enough, or boom low enough to counter this. I have the straps in the mid position on front and back. I should say that in this "uncomfortable" position it still feels OK bearing off deep on a fast run, but trying to get back upwind it feels terrible and I struggle upwind. I am sure I have got something all wrong but not sure what. Maybe I am just raking the sail too far back?

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vosadrian said..

Bender said..
I have a the 2014 Iso 97 wood. I have consistently got 36's and 37's on it with 7.0m and 7.8m Reflex 4 sails the fins I use are 36 and 33 cm Carbon Vector Volt fins. My best is 38knts with a 6.2m and 30cm fin.

IMHO the trick to getting bigger boards to go quick is through tuning and trim settings. Set the mast base all the way back and then set your boom height so that when sailing broad you are almost tailing walking but still in control. Only when the you are just keeping the "Fin wet" will you hit the high 30's on the bigger kit.

Got a question on tune/trim on my ISO97. I find that I normally put the base a little forward of the recommended position (painted on mast track), and I run a lower boom than most, and probably shorter lines than most (and a higher hook type seat harness). I don't know if I have a strange body proportions, but I find if I move the base back, I can hardly keep my front foot in the strap and put almost all my weight on the back (and the front foot can get knocked out easily by chop). I find it quite uncomfortable. I can counter this by lowering my boom, which seems to get me forward on the board (as mask is raked). Not sure what I am doing wrong, but I cannot get well balanced in my stance unless I put the base forward enough, or boom low enough to counter this. I have the straps in the mid position on front and back. I should say that in this "uncomfortable" position it still feels OK bearing off deep on a fast run, but trying to get back upwind it feels terrible and I struggle upwind. I am sure I have got something all wrong but not sure what. Maybe I am just raking the sail too far back?

This has happened to me before, I find a bigger fin helps solve this problem

Select to expand quote

vosadrian said..

Bender said..
I have a the 2014 Iso 97 wood. I have consistently got 36's and 37's on it with 7.0m and 7.8m Reflex 4 sails the fins I use are 36 and 33 cm Carbon Vector Volt fins. My best is 38knts with a 6.2m and 30cm fin.

IMHO the trick to getting bigger boards to go quick is through tuning and trim settings. Set the mast base all the way back and then set your boom height so that when sailing broad you are almost tailing walking but still in control. Only when the you are just keeping the "Fin wet" will you hit the high 30's on the bigger kit.

Got a question on tune/trim on my ISO97. I find that I normally put the base a little forward of the recommended position (painted on mast track), and I run a lower boom than most, and probably shorter lines than most (and a higher hook type seat harness). I don't know if I have a strange body proportions, but I find if I move the base back, I can hardly keep my front foot in the strap and put almost all my weight on the back (and the front foot can get knocked out easily by chop). I find it quite uncomfortable. I can counter this by lowering my boom, which seems to get me forward on the board (as mask is raked). Not sure what I am doing wrong, but I cannot get well balanced in my stance unless I put the base forward enough, or boom low enough to counter this. I have the straps in the mid position on front and back. I should say that in this "uncomfortable" position it still feels OK bearing off deep on a fast run, but trying to get back upwind it feels terrible and I struggle upwind. I am sure I have got something all wrong but not sure what. Maybe I am just raking the sail too far back?

Vosadrian, I have the same set up as you. Low boom height, transit harness (higher hook), footstraps same position. I have the mast track 1cm back from recommended positon and find this much faster, jibes way better. I have felt that too sometimes with the 2015 Isonics wanting to pull your front foot out going across and upwind.

I had the same issue when I moved the mast track as far back as possible. Try and move the front strap back and the back strap more forward.

Thanks guys!

I agree that this is worst with smaller fins. I really struggle when using a shallow Delta fin in flat water. It is OK when blasting on a deep bear off, but 90% of the time I am fighting with the board to get comfortable. I usually end up with the base forward and boom down to get comfortable, but I am sure it is slower.

It is much better with good slalom fins, but I still find I am base further forward and boom lower than most people. I will try moving the front strap back.

When I do set it up so I am comfortable (base forward), I find that I am good to go and regularly do 100+km sessions, and most often my speed is comparable with the faster guys I am sailing with (within a couple of knots). So it may be just that my setup is different to others, but I would like to understand why and whether I could improve things. I think I am fairly short in the legs and long in the upper body which may be part of it.

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Macroscien said..
I agree Simon, that the best board I ever had.

Do you recommend also 33 cm fin to get around this 37 knots on 7.0 ?

At this moment I use 36 cm that feel very comfortable and doesn't spin upwind, but I feel I could go faster down wind with smaller fin.

yeah 32-33 cm depends on the fin though that is with bp type R wich are a very powerfull fin for there size if its a thinner fin you probably want to go bigger . Be carefull though for a while I was using a much thinner bendier fin and as I went into the bareoff the board would just start to fly to much i had to be very gentle with it going to a much stiffer fin (custom reshaped cut down/ I'm to poor for new fins )and it made a huge difference . 33 knots isn't a bad speed for that board remember you weigh 15-20 kgs less than some of us so your 97 is equivalent to me on a 107 sort of thing but I'm sure with the right conditions you can improve on your 33 .

Yep keep trying different fins and different sizes. Can make a massive difference.