Free RC Car Center of Gravity Balance & Setup Calculator—
gemini-3.0-flash
gemini-3.0-flashOptimize your hobby-grade RC car handling with our free online Center of Gravity balance calculator. Analyze corner weights and visualize weight distribution.
AI Generation Prompt
RC Car Center of Gravity & Balance Visualizer
Overview
A specialized, high-precision utility for RC hobbyists to analyze and visualize chassis balance. Users input weights from four corner scales to generate a visual CoG plot and weight distribution analysis.
Technical Directives
- Architecture: Single-file HTML5/Vanilla JS. Styling via Tailwind CSS CDN.
- Storage: STRICTLY NO localStorage/sessionStorage. All calculations are transient in-memory variables.
- Compatibility: Must function within a sandboxed iframe. Do not use popups/alerts (use custom modals).
- Responsive Design: Mobile-first, utilizing a fluid grid system for input fields on small screens and side-by-side comparison on desktop.
UI Layout
- Header: Title and brief instruction text.
- Input Section: Four numeric input fields arranged to mimic the car layout (FL, FR, RL, RR).
- Visualization Section: An SVG-based canvas displaying a top-down wireframe of a car chassis with an animated, floating "CoG" reticle that updates in real-time as inputs change.
- Data Summary: A table showing calculated metrics (Total Weight, Front/Rear Percentage, Left/Right Percentage, Cross-Weight).
Color Palette (Light-Mode Only)
- Background:
#F9FAFB(Gray-50) - Card Background:
#FFFFFF(White) - Primary Accent:
#2563EB(Blue-600) for active inputs and visual CoG marker. - Text:
#111827(Gray-900) for headings,#4B5563(Gray-600) for secondary text. - Borders/Lines:
#E5E7EB(Gray-200).
Features
- Real-time Updates: The CoG marker moves dynamically on the SVG canvas as the user types.
- Input Validation: Ensure only positive numbers are accepted.
- Dynamic Reporting: Provide a textual summary of the balance (e.g., "Front-Heavy", "Rear-Balanced", "Left-Side Heavy") based on user input.
- Print-Friendly View: A print-stylesheet media query to allow users to print their results for their track notebook.
- Smooth Interactions: Use CSS
transition: all 0.3s ease;for the CoG marker movement to create a high-quality, "premium" feel.
Implementation Guidelines
- Utilize vanilla JS for all mathematical calculations (Sum, Ratios, Cross-Weight).
- SVG coordinate system should be relative to the car dimensions.
- Use
requestAnimationFramefor smooth marker movement if possible. - Ensure the app is fully accessible via keyboard navigation.
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Frequently Asked Questions
Everything you need to know about using this application.
Why is the center of gravity important for my RC car's handling?
The center of gravity (CoG) is the theoretical point where the total weight of your vehicle is concentrated. For remote-controlled cars, achieving a balanced CoG is essential for consistent handling, predictable cornering, and optimal tire traction. If your vehicle is unbalanced, it will exhibit different turning characteristics when turning left versus turning right. By adjusting the weight distribution using our balance tool, you ensure that the car reacts predictably under race conditions, significantly improving your lap times and overall control.
How does this RC balance board visualizer work?
This application utilizes real-world physics calculations based on the four-corner weight method. You input the weight measured at each of the four wheels, and the application calculates the total mass, front-to-rear bias, and left-to-right bias of your chassis. The visualizer creates a coordinate-based map of your vehicle's chassis, plotting the exact Center of Gravity as a marker. This provides an immediate visual representation of where your car is 'heavy,' allowing you to make precise adjustments to battery placement, ballast, or suspension geometry.
Can I save my vehicle setups using this tool?
For privacy and security reasons, this application does not use browser storage technologies like localStorage, cookies, or IndexedDB. All calculations and visual data exist strictly within your browser's memory and are discarded when you refresh or close the page. We recommend keeping a notebook or a separate spreadsheet open to track your changes and findings manually. This 'stateless' approach ensures your data remains private and the tool remains lightweight, fast, and fully functional in any sandboxed browser environment.
What measurements are required for accurate results?
To get the most accurate results, you need an RC-specific corner weight scale set. You should place the car on a flat, level surface and record the individual weight readings for the front-left, front-right, rear-left, and rear-right wheels separately. Ensure that the car is in 'race-ready' trim, including the battery, body shell, and any other components you normally run. Consistency is key; perform your measurements on a clean, hard surface to avoid skewing the weight distribution data and ensuring the visualization accurately reflects your real-world setup.
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