Observed arrival · 2026-09-25
A sail lab that turns trim into visible forces
An interactive sail-aerodynamics simulator shows how wind and sail trim affect airflow, forces, and boat speed.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Sailing learners and boat-trim tinkerers
- Worth noticing
- Its flow guide compares luffing, attached flow, stall onset, and stall through suction, drag, and telltale behavior.
Field notes
The page pairs live force-and-speed readouts with explanatory panels for lift and drag, suction along the sail, drive against hull resistance, and a polar diagram. Controls include wind, trim, gusts, and four points of sail. The boat selector names the monohull as based on an Oceanis 40.1 class cruiser and the catamaran on a Lagoon 440 class cruising catamaran. The extracted evidence does not describe the model's assumptions or validation.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue