How to design a boat hull?

To design a boat hull: 1) Enter main dimensions (LOA, Beam, Draft, Depth), 2) Set displacement and speed, 3) Choose deadrise angle (17-20° for planing hulls), 4) Set LCG position (40% LOA optimal), 5) Click Generate Hull, 6) Review 3D visualization and offset table.

What is the Savitsky method for hull resistance?

The Savitsky method is the industry-standard calculation for planing hull resistance. It calculates resistance based on deadrise angle, trim angle, wetted surface area, and speed. Our tool uses a calibrated Savitsky method with 3.41% accuracy compared to CFD and test data.

How to calculate propeller size for a boat?

Propeller size depends on boat speed, engine power, and gear ratio. Use B-Series propeller charts: 1) Calculate thrust required, 2) Determine propeller diameter using BT-BC charts, 3) Find pitch ratio, 4) Check cavitation margin, 5) Verify efficiency. Our tool automates these calculations.

Is this boat design tool free?

Yes! This boat design calculator is 100% free to use. No registration required. No download needed. Works in any modern web browser.

Free Boat Design Calculator Online - Hull Resistance & Propeller Design Tool

Name: Naval Architecture AI - Free Boat Design Calculator
Rating: 4.8 (42 reviews)
Author: Naval Architecture AI

Select Mode:

🎮 Game Mode: Learn boat design through play!

🤖 AI Ready - Type natural language

LOA (m)

Beam (m)

Draft (m)

Depth (m) Deck height above keel / 甲板高度

Displacement (t)

Speed (knots)

Deadrise (°)

LCG from Transom (%) Longitudinal CG / 纵向重心位置 (affects trim)

🏠 Deck House / Cabin

Length (m)

Width (m)

Height (m)

Position X (m)

🔩 Hull Plates Structure

Bottom Plate 船底板 (mm)

Side Plate 舷侧板 (mm)

Deck Plate 甲板板 (mm)

Chine Strake 折角板 (mm)

Keel Plate 龙骨板 (mm)

Material

Longitudinal Seam Count 0=none, 1=keel only, 2=+chine

Transverse Frames Number of plate joints

● Bottom: -

● Side: -

● Deck: -

● Chine: -

● Keel: -

Total: -

Offset Table

请先生成船型

Resistance Calculation

Min Speed (kn)

Max Speed (kn)

🔩 CCS Structure Calculation

CCS《海上高速船入级与建造规范》2005 - Aluminum alloy structure design

Navigation Area 航区

🔹 Frame Spacing 肋骨间距 (m)

Typical: 0.4-0.6m for small craft

🔹 Stiffener Spacing 扶强材间距 (m)

Typical: 0.3-0.4m for bottom plating

🔹 Longitudinal Span 纵骨跨距 (m)

Distance between transverse floors

📊 Hydrostatics Calculator

Displacement, LCB, KB, TPC, MCT calculation using Simpson's rule

⚖️ Stability Calculator

GM, GZ curve, IMO A.749(18) compliance check

VCG (m from keel)

Max Heel Angle (°)

BoatClaw AI:
Hello! I'm Naval Architecture AI.
使用您原始文件的完整代码：
• HullGenerator (变底升角)
• Viewer3D (Three.js)
• ResistanceCalculator (Savitsky)

请告诉我您需要什么帮助！

Thinking...

🎮

USV Simulator Game

A standalone boat simulator game with realistic physics, wave animations, and target collection challenges.

🚤

Realistic Physics

🎯

Collect Targets

🌊

Wave Effects

✨

Particle Effects

🚀 Launch Game →

Opens in new tab • 18 KB standalone file • No external dependencies

🛥️ Mission Planner

No waypoints yet. Click "Add Waypoint" or "Survey Grid"

Game Controls: Arrow Keys/WASD | AI: Click "AI Auto-Pilot" in game
Physics: Based on LOA, Beam, Disp, Speed from your design

Professional Hull Design and Propeller Calculator Online

Boat Designer AI is a free, professional-grade marine engineering tool that helps naval architects, boat builders, and marine engineers design high-performance vessels. Our AI-powered platform provides accurate hull resistance calculations, propeller design optimization, and comprehensive vessel performance analysis.

Key Features of Our Boat Design Tool:

Hull Resistance Calculation - Advanced Savitsky method for planing hulls and displacement vessels

Propeller Design - B-Series propeller optimization with cavitation analysis

3D Hull Visualization - Real-time 3D rendering of hull geometry and offset tables

AI Design Assistant - Natural language interface powered by BoatClaw AI with 5,016 marine engineering Q&A pairs

Performance Analysis - Speed-power curves, resistance predictions, and efficiency calculations

Free to Use - No subscription required, bring your own API key

Who Uses This Tool?

Our boat design software is used by naval architects, marine engineers, yacht designers, boat builders, maritime students, and hobbyist boat designers worldwide. Whether you're designing a high-speed planing boat, displacement yacht, or commercial vessel, our tool provides the calculations you need.

Supported Vessel Types:

High-speed planing boats (25-60 knots)

Displacement hulls and semi-displacement vessels

Monohull and catamaran designs

Patrol boats, yachts, and commercial craft

Vessels from 6m to 50m+ length

Technical Capabilities:

Calculate beam, draft, displacement, LCG, deadrise angle, resistance curves, propeller diameter, pitch, blade area ratio, cavitation risk, engine power requirements, and fuel efficiency. Export designs as CSV, generate offset tables, and visualize hull lines in 3D.

Start designing your boat now - completely free!

Naval Architecture AI

🏠 Deck House / Cabin

🔩 Hull Plates Structure

Offset Table

Resistance Calculation

🔩 CCS Structure Calculation

📊 Hydrostatics Calculator

⚖️ Stability Calculator

USV Simulator Game

🛥️ Mission Planner

Free Boat Design Software - AI-Powered Marine Engineering Tool

Professional Hull Design and Propeller Calculator Online

Key Features of Our Boat Design Tool:

Who Uses This Tool?

Supported Vessel Types:

Technical Capabilities:

📚 Naval Architecture Blog

How to Design a Boat

Hull Resistance Calculation

15m Patrol Boat Design

B-Series Propeller Design

Software Comparison 2026

Planing vs Displacement Hulls