Forums > Windsurfing General

Large sail , shallow water fin project / experiment

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Created by Imax1 > 9 months ago, 18 Aug 2023
fangman
WA, 1774 posts
24 Aug 2023 1:44PM
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Well that's the first hurdle cleared nicely.Congrats Imax!
Got me thinking about elastic deformation - vibration dampening - comfort - endurance (old knees). I notice road bicycles have moved away from super skinny tyres toward wider profiles with better shock absorption, with the argument that the increased friction is outweighed by the decreased vibration fatigue and subsequent improved endurance of the rider. (no clue if this true or marketing).It will be interesting to see how you feel after a longer sesh. Does increased comfort correlate with noticeably increased drag at cruising speeds?

Imax1
QLD, 4863 posts
24 Aug 2023 4:04PM
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I'm keen to see how it bashes through medium chop at 25 kts. That's the real test.

Imax1
QLD, 4863 posts
5 Sep 2023 4:01PM
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Update,
Overpowered , medium chop , NP V8 8.7 27kt peak , 26kts 100m. It worked great . I didn't notice anything unusual about it apart from being able to fire upwind and there being no chance of it spinning out. It didn't try to kill me. 30 kts , here we come . I think I need a smaller one for smaller sails.

fangman
WA, 1774 posts
5 Sep 2023 2:13PM
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This is sounding very cool. Any sign of any stress crazing at the fin base/foil root yet?

Imax1
QLD, 4863 posts
5 Sep 2023 4:28PM
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Select to expand quote
fangman said..
This is sounding very cool. Any sign of any stress crazing at the fin base/foil root yet?


Solid as a rock. I think it will be fine.

choco
SA, 4096 posts
5 Sep 2023 5:43PM
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Select to expand quote
fangman said..
Well that's the first hurdle cleared nicely.Congrats Imax!
Got me thinking about elastic deformation - vibration dampening - comfort - endurance (old knees). I notice road bicycles have moved away from super skinny tyres toward wider profiles with better shock absorption, with the argument that the increased friction is outweighed by the decreased vibration fatigue and subsequent improved endurance of the rider. (no clue if this true or marketing).It will be interesting to see how you feel after a longer sesh. Does increased comfort correlate with noticeably increased drag at cruising speeds?



The wider tyres have better rolling resistance

duzzi
1084 posts
5 Sep 2023 11:49PM
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Select to expand quote
Imax1 said..
Update,
Overpowered , medium chop , NP V8 8.7 27kt peak , 26kts 100m. It worked great . I didn't notice anything unusual about it apart from being able to fire upwind and there being no chance of it spinning out. It didn't try to kill me. 30 kts , here we come . I think I need a smaller one for smaller sails.


All this looks fantastic, but ... maybe carry a spare fin? I had a K4 (plastic) Fang 30 sheer off completely on my FSW (first time ever I had to call for rescue), Just saying, maybe it was not the material and this is a small fin ... but ...

Paducah
2627 posts
6 Sep 2023 1:10AM
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Select to expand quote
choco said..
fangman said..
Well that's the first hurdle cleared nicely.Congrats Imax!
Got me thinking about elastic deformation - vibration dampening - comfort - endurance (old knees). I notice road bicycles have moved away from super skinny tyres toward wider profiles with better shock absorption, with the argument that the increased friction is outweighed by the decreased vibration fatigue and subsequent improved endurance of the rider. (no clue if this true or marketing).It will be interesting to see how you feel after a longer sesh. Does increased comfort correlate with noticeably increased drag at cruising speeds?



The wider tyres have better rolling resistance


or alternatively, better or equivalent rolling resistance and comfort; and as the road surface becomes more irregular an increased margin of safety to flats, punctures, etc. Was on a week long road tour last week, we were all on 30-32s*. It would have been a horror show 15 years ago due to the rough roads when 23-25s that were the norm and many road bikes couldn't fit anything larger.

www.bicyclerollingresistance.com/specials/grand-prix-5000-comparison#drop45

* for the non-cycling, those are the tire widths in mm.

Back on topic, I so desperately wanted something like this when I used to sail a Formula board at a renowned shallow flatwater spot. Even with a normal weedie, I'd have to walk out 200 m or more to get water deep enough to sail at times. But it was still better than being on the beach waiting for more wind. Love to see what the clever and creative minds on this forum come up with.

Imax1
QLD, 4863 posts
6 Jan 2024 5:31PM
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So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.

jn1
SA, 2516 posts
6 Jan 2024 7:23PM
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That's awesome Imax. Well done

Gestalt
QLD, 14471 posts
6 Jan 2024 8:56PM
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Great stuff imax.. Faster than the wind we've been getting!

MobZ
NSW, 356 posts
6 Jan 2024 10:27PM
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Super PB on your own fin. That must feel great. Congratulations.

decrepit
WA, 12444 posts
6 Jan 2024 7:53PM
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Fantastic, great work imax

AusMoz
QLD, 1475 posts
7 Jan 2024 8:21AM
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Imax1 said..
So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.


Hurry up and download it to the Gps challenge!

Imax1
QLD, 4863 posts
7 Jan 2024 8:45AM
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AusMoz said..

Imax1 said..
So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.



Hurry up and download it to the Gps challenge!


I'm so wanting to do that. But my modem just blew up. I should have a new one delivered in a couple days. Then it's official.

fangman
WA, 1774 posts
7 Jan 2024 9:11AM
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That's an awesome bit of news. Stoked for ya buddy

AusMoz
QLD, 1475 posts
7 Jan 2024 5:29PM
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Select to expand quote
Imax1 said..

AusMoz said..


Imax1 said..
So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.




Hurry up and download it to the Gps challenge!



I'm so wanting to do that. But my modem just blew up. I should have a new one delivered in a couple days. Then it's official.


I want officials results! Not excuses! Dont you know my life revolves around GPS Challenge results!

Imax1
QLD, 4863 posts
7 Jan 2024 6:08PM
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Select to expand quote
AusMoz said..

Imax1 said..


AusMoz said..



Imax1 said..
So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.





Hurry up and download it to the Gps challenge!




I'm so wanting to do that. But my modem just blew up. I should have a new one delivered in a couple days. Then it's official.



I want officials results! Not excuses! Dont you know my life revolves around GPS Challenge results!


O.......K .
It will be the first thing I do when I get my new black box.
Perhaps for now you need to run a bath with candles.

Tardy
5106 posts
8 Jan 2024 4:45AM
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Thats taking it to the Max ,Imax ,was it on a cat board ?

Imax1
QLD, 4863 posts
8 Jan 2024 7:47AM
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Tardy said..
Thats taking it to the Max ,Imax ,was it on a cat board ?


Yep. 120 litre. That's a sinker for fat me. Np evo 6.6 ,

olskool
QLD, 2455 posts
8 Jan 2024 10:30AM
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As usual with this Guy,
Ingenuity n Quality formed into One.
Nice Numbers Mr Max !

AusMoz
QLD, 1475 posts
8 Jan 2024 6:41PM
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Select to expand quote
Imax1 said..
So I made a smaller 27cm one.




I'm a happy chap. PB by 2 kts.

Good Idea the batn n candles. Still proud of the PB you got.
Note - keep the candles put of the bath AND put in rose petals



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"Large sail , shallow water fin project / experiment" started by Imax1