[HN Gopher] Sail-Trim Simulator
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Sail-Trim Simulator
Author : stass
Score : 66 points
Date : 2025-04-23 18:36 UTC (4 hours ago)
(HTM) web link (simulator.atterwind.info)
(TXT) w3m dump (simulator.atterwind.info)
| zeristor wrote:
| I guess I'm not the only person who opened the link from
| yesterday and didn't see anything about sailing.
|
| https://news.ycombinator.com/item?id=43756926
|
| Thank you, you've resolved my despair.
| quaestio wrote:
| Very cool demo...
|
| Most yachts have polar charts, and the speed is a function of
| sail area, heading, wind speed and direction amongst other
| things. Are you considering calculating estimated boat speed
| based on given conditions and controllable variables?
| stass wrote:
| Not my demo! But I got inspired by it some time ago to build a
| simulator for monohulls which uses a physics based VPP to
| calculate the boat speed based on input controls like
| mainsheet, jib sheet, travelers, backstay and so on at
| https://www.sailrhythm.com/
|
| It uses Catalina 36 Tall Rig as a base model for sailboat
| parameters and was calibrated to match ORC-published polars for
| it within 1-5% on both close, beam and broad reaches.
|
| Mostly built it for myself to help me understand how less
| common control affect the sail shapes, angles of attack and
| boat heel and behavior in a visual way.
|
| It's still WIP, but you might find it useful for yacht-specific
| stuff!
| stass wrote:
| If other people are interested in sailboat physics -- this
| resource is a goldmine of information on how sailboat and sails
| work and physics around it:
| https://www.onemetre.net/Design/Design.htm
| philips wrote:
| I am a lake sailer. And without landmarks or anything it is
| impossible for me to perceive the boat as moving.
| derbOac wrote:
| Even some kind of wake or something would help.
| MOARDONGZPLZ wrote:
| I thought I was doing something wrong. It doesn't seem like
| anything I do has any effect, but guess that's just because
| there is no apparent effect.
| reaperman wrote:
| Eventually it made sense that boat-speed only changes the
| "apparent wind", as it's only simulating wind-boat
| interactions, not water-boat interactions.
| m_herrlich wrote:
| You can set the wind to 0 and the speed somehow stays at 35
| knots, I don't know much about sailing but that can't be right
| cladopa wrote:
| A great project, but it needs some kind of grid movement and
| rocking, foam or something so you can perceive its movement.
| pomian wrote:
| Here is a fun sailboat race simulator. It's very simple, but
| pretty realistic especially for open ocean racing. You can use
| their default race course, sometimes join a planned regatta, or
| make your own. (It was great during COVID, to try racing across
| the oceans, or around the world. It's in real time, so you might
| not need to change anything for days If you are in the trade
| winds, and open ocean, but then when you get closer to land,
| things get "Western" very quickly - just like with a real boat.
| It's called SailNavSim. (Learned about it from HN.)
|
| 8bitbyte.ca
| 867-5309 wrote:
| why so heavy on the water graphics and light on the sail?
| stass wrote:
| You get water graphics for free from three.js
| ge96 wrote:
| it's hard to tell if you're moving
| gitroom wrote:
| That wake thing would've totally helped me too, felt weird not
| seeing any movement. Glad I wasn't the only one who got thrown
| off.
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(page generated 2025-04-23 23:00 UTC)