# Latest

**URL:** https://solarboats.discourse.group/latest.md

[Latest](https://solarboats.discourse.group/latest.md) · [Categories](https://solarboats.discourse.group/categories.md)

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## [Welcome to Build Solar boats! 👋](https://solarboats.discourse.group/t/welcome-to-build-solar-boats/5)

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**Author:** [@system](https://solarboats.discourse.group/u/system)\
**Replies:** 0\
**Last updated:** [October 14, 2026, 5:57pm UTC](https://solarboats.discourse.group/t/welcome-to-build-solar-boats/5 "2026-10-14T17:57:40Z")

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We are so glad you joined us. Build Solar boats Solar electric boats - From Design to Economics Here are some things you can do to get started: :speaking\_head: Introduce yourself by adding your picture and informati…

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## [China Zorilla - The World's ;largest electric ferry](https://solarboats.discourse.group/t/china-zorilla-the-worlds-largest-electric-ferry/21)

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**Author:** [@Sandith](https://solarboats.discourse.group/u/Sandith)\
**Replies:** 2\
**Last updated:** [October 25, 2026, 4:59pm UTC](https://solarboats.discourse.group/t/china-zorilla-the-worlds-largest-electric-ferry/21 "2026-10-25T16:59:40Z")

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Based on the information available in public domain the data is entered and the file created. The summary of inputs are as follows: Speed - 25 knots Power @25 knots - 16,000 kW Total Power - 19,200 kW Battery size - …

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## [Simpler input to calculate Economics without system sizing](https://solarboats.discourse.group/t/simpler-input-to-calculate-economics-without-system-sizing/20)

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**Author:** [@Abhimanyu](https://solarboats.discourse.group/u/Abhimanyu)\
**Replies:** 1\
**Last updated:** [October 25, 2026, 8:55am UTC](https://solarboats.discourse.group/t/simpler-input-to-calculate-economics-without-system-sizing/20 "2026-10-25T08:55:29Z")

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If I need to analyze the economics of a publicly known project, I do not need the system sizing approach. I should be able to enter the battery size, motor size, speed-power for cruise speed, Capex of the project, estima…

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## [Propeller series selector duplication](https://solarboats.discourse.group/t/propeller-series-selector-duplication/19)

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**Author:** [@Abhimanyu](https://solarboats.discourse.group/u/Abhimanyu)\
**Replies:** 1\
**Last updated:** [October 18, 2026, 3:38pm UTC](https://solarboats.discourse.group/t/propeller-series-selector-duplication/19 "2026-10-18T15:38:52Z")

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The propeller series selector is there twice in the same sheet. The lower one to be removed else it will create errors.

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## [Resistance source during propeller design](https://solarboats.discourse.group/t/resistance-source-during-propeller-design/18)

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**Author:** [@Abhimanyu](https://solarboats.discourse.group/u/Abhimanyu)\
**Replies:** 1\
**Last updated:** [October 18, 2026, 1:36pm UTC](https://solarboats.discourse.group/t/resistance-source-during-propeller-design/18 "2026-10-18T13:36:41Z")

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When we select “I have a resistance curve” on the left pane, on the right side under Propeller/Propeller Design, the Resistance source still gives drop down for “Holtrop,…” as if we are estimating. Remove this.

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## [Propeller design for Twin hull/twin props](https://solarboats.discourse.group/t/propeller-design-for-twin-hull-twin-props/17)

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**Author:** [@Abhimanyu](https://solarboats.discourse.group/u/Abhimanyu)\
**Replies:** 1\
**Last updated:** [October 18, 2026, 1:05pm UTC](https://solarboats.discourse.group/t/propeller-design-for-twin-hull-twin-props/17 "2026-10-18T13:05:01Z")

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When we are trying to design the propeller after finalizing the speed-resistance using CFD or model test, if it is twin prop system there is no way the thrust is shared in the current module. Can you add the twin prop op…

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## [100 Pax Ferry - From Speed vs Resistance to Economics](https://solarboats.discourse.group/t/100-pax-ferry-from-speed-vs-resistance-to-economics/16)

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**Author:** [@Sandith](https://solarboats.discourse.group/u/Sandith)\
**Replies:** 1\
**Last updated:** [October 16, 2026, 5:29pm UTC](https://solarboats.discourse.group/t/100-pax-ferry-from-speed-vs-resistance-to-economics/16 "2026-10-16T17:29:57Z")

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This file is for a 100 pax solar ferry where start from the speed versus resistance that is obtained from CFD and build the speed-power using assumed QPC of propeller and go to the system design nd economics based on spe…