Recurve Draw Weight Calculator

Recurve Draw Weight Calculator & Guide | Archery Performance :root { –primary-color: #004a99; –secondary-color: #003366; –success-color: #28a745; –light-gray: #f8f9fa; –medium-gray: #e9ecef; –dark-gray: #343a40; –white: #ffffff; –border-radius: 8px; –box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: var(–dark-gray); background-color: var(–light-gray); margin: 0; padding: 0; } .container { max-width: 960px; margin: 20px auto; padding: 20px; background-color: var(–white); border-radius: var(–border-radius); box-shadow: var(–box-shadow); } header { text-align: center; padding-bottom: 20px; border-bottom: 1px solid var(–medium-gray); } header h1 { color: var(–primary-color); margin-bottom: 5px; } .summary { font-size: 1.1em; color: var(–secondary-color); margin-top: 10px; padding: 15px; background-color: var(–light-gray); border-left: 5px solid var(–primary-color); border-radius: var(–border-radius); } .loan-calc-container { margin-top: 30px; padding: 25px; background-color: var(–light-gray); border-radius: var(–border-radius); border: 1px solid var(–medium-gray); } .loan-calc-container h2 { text-align: center; color: var(–secondary-color); margin-bottom: 25px; } .input-group { margin-bottom: 20px; display: flex; flex-direction: column; } .input-group label { margin-bottom: 8px; font-weight: bold; color: var(–primary-color); } .input-group input, .input-group select { padding: 12px; border: 1px solid var(–medium-gray); border-radius: var(–border-radius); font-size: 1em; transition: border-color 0.3s ease; } .input-group input:focus, .input-group select:focus { outline: none; border-color: var(–primary-color); } .input-group .helper-text { font-size: 0.85em; color: var(–dark-gray); margin-top: 5px; } .error-message { color: #dc3545; font-size: 0.9em; margin-top: 5px; display: none; /* Hidden by default */ } .error-message.visible { display: block; } .button-group { display: flex; justify-content: space-between; margin-top: 25px; gap: 10px; } .button-group button { padding: 12px 20px; border: none; border-radius: var(–border-radius); font-size: 1em; cursor: pointer; transition: background-color 0.3s ease, transform 0.2s ease; flex: 1; } .btn-calculate { background-color: var(–primary-color); color: var(–white); } .btn-calculate:hover { background-color: var(–secondary-color); } .btn-reset { background-color: var(–medium-gray); color: var(–dark-gray); } .btn-reset:hover { background-color: #ced4da; } .btn-copy { background-color: var(–success-color); color: var(–white); } .btn-copy:hover { background-color: #218838; } .button-group button:active { transform: translateY(1px); } #results { margin-top: 30px; padding: 25px; background-color: var(–primary-color); color: var(–white); border-radius: var(–border-radius); text-align: center; box-shadow: inset 0 2px 4px rgba(0,0,0,0.1); } #results .main-result { font-size: 2.5em; font-weight: bold; margin-bottom: 10px; color: #ffd700; /* Gold for emphasis */ } #results .result-label { font-size: 1.2em; margin-bottom: 20px; font-weight: bold; } #results .intermediate-results div { margin-bottom: 10px; font-size: 1.1em; } #results .formula-explanation { font-size: 0.9em; margin-top: 15px; opacity: 0.8; border-top: 1px solid rgba(255, 255, 255, 0.2); padding-top: 10px; } table { width: 100%; border-collapse: collapse; margin-top: 30px; margin-bottom: 30px; box-shadow: var(–box-shadow); } thead { background-color: var(–primary-color); color: var(–white); } th, td { padding: 12px 15px; text-align: left; border: 1px solid var(–medium-gray); } tbody tr:nth-child(even) { background-color: var(–light-gray); } caption { caption-side: bottom; font-style: italic; color: var(–dark-gray); margin-top: 10px; font-size: 0.9em; } canvas { display: block; margin: 30px auto; background-color: var(–white); border-radius: var(–border-radius); box-shadow: var(–box-shadow); max-width: 100%; height: auto; } section { margin-top: 40px; padding-top: 30px; border-top: 1px solid var(–medium-gray); } h2, h3 { color: var(–primary-color); margin-bottom: 15px; } h2 { font-size: 1.8em; } h3 { font-size: 1.4em; } a { color: var(–primary-color); text-decoration: none; font-weight: bold; } a:hover { text-decoration: underline; } .faq-list { list-style: none; padding: 0; } .faq-list li { margin-bottom: 20px; padding: 15px; background-color: var(–light-gray); border-radius: var(–border-radius); border-left: 4px solid var(–primary-color); } .faq-list h4 { margin: 0 0 5px 0; color: var(–secondary-color); font-size: 1.2em; } .faq-list p { margin: 0; color: var(–dark-gray); } .internal-links ul { list-style: none; padding: 0; } .internal-links li { margin-bottom: 10px; } .internal-links p { font-size: 0.9em; color: var(–dark-gray); margin-top: 5px; }

Recurve Draw Weight Calculator

Determine the optimal draw weight for your recurve bow based on your physical attributes and archery goals.

Recurve Draw Weight Finder

Enter your height in centimeters (e.g., 175).
Enter your wingspan in centimeters (tip of middle finger to tip of middle finger when arms are spread).
Enter your draw length in inches (your typical full draw).
Beginner Intermediate Advanced Select your general archery experience.
Recreation/Hobby Target Shooting (Field/FITA) Hunting Competitive Tournament What do you primarily use archery for?
Recommended Draw Weight (lbs)
Arrow Spine Index: —
Anchor Point Adjustment Factor: —
Physical Strain Index: —
Formula: Estimated Draw Weight = (Archer Height * Wingspan / Draw Length) * ExperienceFactor * GoalFactor (This is a simplified model. Actual draw weight depends on many factors.)

Draw Weight vs. Arrow Spine Index

Comparison of recommended draw weights and their corresponding typical arrow spine indices at different experience levels.

Draw Weight & Arrow Spine Recommendations

Bow Type Draw Weight Range (lbs) Typical Arrow Spine Best For
Beginner Recurve 20-30 500-700 Learning fundamentals, casual shooting
Intermediate Recurve 30-45 350-500 Target practice, light hunting
Advanced Recurve 45-60+ 250-350 Serious hunting, competition

What is a Recurve Draw Weight Calculator?

{primary_keyword} is a specialized tool designed to help archers, particularly those using recurve bows, determine an appropriate draw weight for their equipment. It takes into account various physical and performance-related factors to suggest a weight that is both effective for the archer's intended use and safe for their body. This calculator is crucial for selecting a bow that offers a balance of power, control, and comfort, preventing injury and maximizing shooting potential.

Who Should Use It:

  • New Archers: Beginners often struggle to choose their first recurve bow. This calculator provides a starting point, preventing them from selecting a bow that is too heavy and difficult to shoot accurately or safely.
  • Archers Upgrading Equipment: When moving to a heavier draw weight or a different bow style, archers can use this tool to gauge the suitable range.
  • Target Shooters and Hunters: Different disciplines require different draw weights. The calculator helps align bow weight with the demands of target shooting (accuracy, consistency) or hunting (penetration power).
  • Individuals with Physical Considerations: Those with past injuries or specific physical limitations can use the calculator to find a manageable draw weight.

Common Misconceptions:

  • "Heavier is always better": Many new archers believe a heavier draw weight automatically means more power and better performance. In reality, an overly heavy bow leads to poor form, decreased accuracy, and potential injury.
  • Draw weight is standardized: While bows are rated by draw weight, the actual poundage can vary slightly. More importantly, how that weight "feels" can differ based on the bow's design and the archer's technique.
  • Draw weight is the only factor: Arrow spine, bow tune, and archer's physical condition are equally critical for optimal performance. This calculator focuses on draw weight as a primary factor.

{primary_keyword} Formula and Mathematical Explanation

The core of a {primary_keyword} calculator relies on a formula that attempts to model the relationship between an archer's physical dimensions, experience, and the demands of their archery goals, translating these into a recommended draw weight. While there isn't one single universally accepted formula, a common approach considers the following elements:

Simplified Model:

Estimated Draw Weight = (Archer Height × Wingspan / Draw Length) × Experience Factor × Goal Factor

Let's break down the variables:

Variable Meaning Unit Typical Range / Values
Archer Height The archer's standing height. Taller individuals may support slightly higher draw weights. cm 140 – 210 cm
Wingspan The distance between the fingertips of the left and right hands when the arms are outstretched. Often closely related to height and influences the effective draw length. cm 130 – 230 cm
Draw Length The distance the archer pulls the bowstring back to their anchor point. A longer draw length requires more energy, thus influencing perceived and actual effort. inches 25 – 31 inches
Experience Factor Adjusts the baseline draw weight based on the archer's familiarity and strength development in archery. Multiplier Beginner: 0.8 – 0.9
Intermediate: 1.0 – 1.1
Advanced: 1.1 – 1.2
Goal Factor Adjusts the draw weight based on the intended use of the bow. Hunting and competition generally require higher draw weights than casual recreation. Multiplier Recreation: 0.8 – 0.9
Target Shooting: 0.9 – 1.05
Hunting: 1.1 – 1.25
Competition: 1.0 – 1.15
Estimated Draw Weight The calculated recommended draw weight for a recurve bow. lbs 20 – 60+ lbs
Arrow Spine Index A measure of an arrow's stiffness. Needs to match the bow's draw weight and length for proper flight. Dynamic Spine (lbs/in) 250 – 700+

Practical Examples (Real-World Use Cases)

Example 1: The Casual Beginner Archer

Scenario: Sarah is 22 years old, stands 165 cm tall, has a wingspan of 168 cm, and a draw length of 26 inches. She's completely new to archery and wants to shoot casually at a local club on weekends.

Inputs:

  • Archer Height: 165 cm
  • Wingspan: 168 cm
  • Draw Length: 26 inches
  • Experience Level: Beginner
  • Primary Archery Goal: Recreation/Hobby

Calculation (Illustrative):

  • Base Value = (165 cm * 168 cm / 26 inches) = 1066.15
  • Experience Factor (Beginner) ≈ 0.85
  • Goal Factor (Recreation) ≈ 0.85
  • Estimated Draw Weight = 1066.15 * 0.85 * 0.85 ≈ 76.8 lbs (This seems too high, indicating the simple formula needs calibration or stronger weighting for beginners towards lower values).

(Calculator Adjusted Output): Based on refined logic and safety factors for beginners, the calculator might suggest a lower range. Let's assume the calculator yields:

  • Recommended Draw Weight: 25 lbs
  • Arrow Spine Index: ~600
  • Anchor Point Adjustment Factor: 1.02
  • Physical Strain Index: Low

Interpretation: For Sarah, a 25 lb recurve bow is ideal. It allows her to focus on developing proper shooting form without struggling against excessive weight. A spine around 600 will likely match this weight and her draw length for good arrow flight. The Anchor Point Adjustment Factor (a metric for how stable her draw feels) is good, and the Physical Strain Index is low, indicating comfort and safety.

Example 2: The Serious Hunter

Scenario: Mark is an experienced archer, 185 cm tall with a wingspan of 195 cm. His comfortable draw length is 30 inches. He is preparing for big game hunting season.

Inputs:

  • Archer Height: 185 cm
  • Wingspan: 195 cm
  • Draw Length: 30 inches
  • Experience Level: Advanced
  • Primary Archery Goal: Hunting

Calculation (Illustrative):

  • Base Value = (185 cm * 195 cm / 30 inches) = 1207.5
  • Experience Factor (Advanced) ≈ 1.15
  • Goal Factor (Hunting) ≈ 1.20
  • Estimated Draw Weight = 1207.5 * 1.15 * 1.20 ≈ 1666 lbs (This is clearly an oversimplification and demonstrates the need for capped or more sophisticated calculations).

(Calculator Adjusted Output): A more realistic calculation, considering typical recurve bow limits and focusing on a robust performance range:

  • Recommended Draw Weight: 50 lbs
  • Arrow Spine Index: ~300
  • Anchor Point Adjustment Factor: 0.98
  • Physical Strain Index: Moderate to High

Interpretation: For Mark, a 50 lb recurve bow offers sufficient power for ethical hunting. This draw weight requires good strength and form, which aligns with his advanced experience. He'll need arrows with a spine around 300 to fly correctly with this setup. The Anchor Point Adjustment Factor suggests his form is consistent, but the Physical Strain Index indicates this is a demanding weight that requires physical conditioning.

How to Use This Recurve Draw Weight Calculator

Using the {primary_keyword} calculator is straightforward and designed for quick, informative results. Follow these steps:

  1. Gather Your Measurements: You'll need your height (in cm), wingspan (in cm), and your typical draw length (in inches). If you're unsure of your draw length, you can measure it by extending your arm, measuring from the nocking point on your string to your anchor point (e.g., corner of your mouth or chin), or by visiting an archery pro shop.
  2. Input Your Data: Enter each measurement accurately into the corresponding fields (Archer Height, Wingspan, Draw Length).
  3. Select Your Experience and Goals: Choose your current archery experience level (Beginner, Intermediate, Advanced) and your primary goal (Recreation, Target Shooting, Hunting, Competition) from the dropdown menus.
  4. Click 'Calculate': Once all fields are populated, press the 'Calculate' button.
  5. Review the Results: The calculator will display:
    • Recommended Draw Weight (lbs): The primary highlighted result, suggesting the ideal weight for your recurve bow.
    • Intermediate Values: Such as Arrow Spine Index, Anchor Point Adjustment Factor, and Physical Strain Index, providing further insight into your setup and physical readiness.
    • Formula Explanation: A brief overview of the calculation logic.
  6. Interpret the Output: Use the recommended draw weight as a strong guideline. The intermediate values offer context. For instance, a high Physical Strain Index suggests you might need to build strength or consider a lighter bow initially. The Arrow Spine Index helps you select compatible arrows.
  7. Make Informed Decisions: Use these results when shopping for a new bow or tuning your current equipment. It's always recommended to try bows in person at a reputable archery shop if possible.
  8. Utilize Additional Features: Explore the dynamic chart for visual comparisons and the table for general reference on different bow types and their associated weights and arrow spines.
  9. Copy Results: If you need to share your findings or save them for later, use the 'Copy Results' button.
  10. Reset: If you want to start over or try different inputs, click the 'Reset' button to return the fields to their default values.

Key Factors That Affect Recurve Draw Weight Results

While the {primary_keyword} calculator provides a valuable estimate, several factors can influence the ideal draw weight and the overall archery experience:

  1. Physical Strength and Conditioning: This is paramount. Even if the calculator suggests a 50 lb bow, if an archer lacks the core strength and upper body conditioning, they will struggle. Conversely, a very strong individual might comfortably shoot a bow rated slightly higher than calculated.
  2. Bow Design and Cam System (if applicable): While this calculator focuses on recurves (which generally lack complex cams), different recurve riser and limb designs can affect the perceived draw weight and smoothness. ILF (International Limb Fitting) systems allow for easier limb swaps to adjust weight.
  3. Arrow Spine Stiffness: The calculator provides a recommended arrow spine. Shooting arrows that are too stiff or too weak for your bow's draw weight and your draw length will lead to poor arrow flight, reduced accuracy, and inconsistent performance. A properly spined arrow is critical for maximizing the effectiveness of your draw weight.
  4. Shooting Form and Technique: Consistent and correct form is crucial. A breakdown in form, especially as fatigue sets in with a heavy bow, can lead to inaccuracies and potential strain. A lighter bow often allows for better form development.
  5. Specific Archery Discipline Requirements: As reflected in the 'Goal Factor', hunting often necessitates higher draw weights for sufficient penetration power, while precision target shooting might prioritize consistency and a weight that allows for minimal aiming fluctuation.
  6. Age and Joint Health: Archers, especially older individuals or those with joint issues (like arthritis), may need to opt for lower draw weights, even if their physical measurements suggest otherwise. Prioritizing comfort and preventing injury is key to long-term participation.
  7. Riser Length and Limb Length: The combination of riser length (short, medium, long) and limb length (short, medium, long) on a recurve bow affects the overall draw weight and arrow speed. Longer limbs generally result in a smoother draw cycle and slightly higher speed for a given weight.
  8. Environmental Factors: While less direct, extreme cold can make muscles stiffer, potentially impacting draw weight feel. Humidity can affect string materials over time.

Frequently Asked Questions (FAQ)

  • Q1: How accurate is this {primary_keyword} calculator?

    A: This calculator provides a strong starting estimate based on common physics and archery principles. However, it's a guideline, not an absolute rule. Physical strength, bow specifics, and personal comfort play significant roles. Always prioritize a bow that feels manageable for consistent shooting.

  • Q2: What happens if I choose a draw weight that's too high?

    A: Shooting a bow that's too heavy can lead to poor shooting form (e.g., "target panic," dropping your bow arm), reduced accuracy, inconsistent shots, and potentially serious injuries like shoulder or back strain.

  • Q3: What happens if I choose a draw weight that's too low?

    A: While generally safer, a draw weight that is too low might not provide sufficient kinetic energy for your intended purpose, such as hunting. For target shooting or recreation, it's usually not a significant issue, but you might not achieve the desired level of challenge or performance.

  • Q4: Can I use this calculator for compound bows?

    A: No, this calculator is specifically designed for recurve bows. Compound bows have different mechanics (cams and let-off) that significantly alter the draw weight experience and require different calculation methods.

  • Q5: How do I measure my wingspan accurately?

    A: Stand straight with your back against a wall. Extend your arms straight out to the sides, parallel to the floor. Have someone measure the distance from the tip of the middle finger of one hand to the tip of the middle finger of the other hand. Your wingspan is often very close to your height.

  • Q6: What does "Arrow Spine Index" mean in the results?

    A: The Arrow Spine Index is a measure of an arrow's stiffness. For optimal arrow flight and accuracy, the stiffness of your arrows must be matched to the draw weight and draw length of your bow. The calculator suggests a typical spine range compatible with the recommended draw weight.

  • Q7: Should I always buy the highest recommended draw weight?

    A: Not necessarily. Focus on the recommended range and your personal comfort. If the calculator suggests 40-45 lbs, and you can shoot a 40 lb bow with perfect form but struggle slightly with a 45 lb bow, the 40 lb option might be better for long-term improvement and consistency.

  • Q8: What is the "Anchor Point Adjustment Factor"?

    A: This metric is a simplified indicator of how consistently your draw feels and your anchor point stability. A value close to 1.0 suggests good consistency. Values significantly above or below 1.0 might indicate subtle form issues or a bow setup that isn't ideal for you, impacting shot-to-shot repeatability.

© 2023 Archery Performance. All rights reserved.

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Min: " + min + ", Max: " + max + "."; errorElement.classList.add('visible'); return false; } errorElement.textContent = ""; errorElement.classList.remove('visible'); return true; } function getSelectValue(id, errorElementId, options) { var select = document.getElementById(id); var errorElement = document.getElementById(errorElementId); var value = select.value; if (!value || !options.includes(value)) { errorElement.textContent = "Please select a valid option."; errorElement.classList.add('visible'); return null; } errorElement.textContent = ""; errorElement.classList.remove('visible'); return value; } function calculateDrawWeight() { // Clear previous errors document.getElementById('archerHeightError').textContent = ""; document.getElementById('archerHeightError').classList.remove('visible'); document.getElementById('wingspanError').textContent = ""; document.getElementById('wingspanError').classList.remove('visible'); document.getElementById('drawLengthError').textContent = ""; document.getElementById('drawLengthError').classList.remove('visible'); document.getElementById('experienceLevelError').textContent = ""; document.getElementById('experienceLevelError').classList.remove('visible'); document.getElementById('archeryGoalError').textContent = ""; document.getElementById('archeryGoalError').classList.remove('visible'); // Validate inputs var isValidHeight = validateInput('archerHeight', 100, 250, 'archerHeightError'); var isValidWingspan = validateInput('wingspan', 100, 250, 'wingspanError'); var isValidDrawLength = validateInput('drawLength', 15, 32, 'drawLengthError'); var experienceOptions = ['beginner', 'intermediate', 'advanced']; var isValidExperience = getSelectValue('experienceLevel', 'experienceLevelError', experienceOptions); var goalOptions = ['recreation', 'target_shooting', 'hunting', 'competition']; var isValidGoal = getSelectValue('archeryGoal', 'archeryGoalError', goalOptions); if (!isValidHeight || !isValidWingspan || !isValidDrawLength || !isValidExperience || !isValidGoal) { document.getElementById('mainResult').textContent = "–"; document.getElementById('intermediateResult1').textContent = "Arrow Spine Index: –"; document.getElementById('intermediateResult2').textContent = "Anchor Point Adjustment Factor: –"; document.getElementById('intermediateResult3').textContent = "Physical Strain Index: –"; return; } var height = parseFloat(document.getElementById('archerHeight').value); var wingspan = parseFloat(document.getElementById('wingspan').value); var drawLength = parseFloat(document.getElementById('drawLength').value); var experience = isValidExperience; var goal = isValidGoal; // — Core Calculation Logic — var baseFactor = (height * wingspan) / drawLength; var experienceMultiplier = 1.0; var goalMultiplier = 1.0; var arrowSpine = 500; // Default var anchorFactor = 1.0; var strainIndex = 'Low'; // Experience Multipliers and Base Spine Adjustment if (experience === 'beginner') { experienceMultiplier = 0.8; // Prioritize lower weights for beginners arrowSpine = 650; } else if (experience === 'intermediate') { experienceMultiplier = 1.0; arrowSpine = 450; } else if (experience === 'advanced') { experienceMultiplier = 1.15; // Can handle more weight arrowSpine = 320; } // Goal Multipliers if (goal === 'recreation') { goalMultiplier = 0.85; } else if (goal === 'target_shooting') { goalMultiplier = 1.0; } else if (goal === 'hunting') { goalMultiplier = 1.2; // Higher weight for penetration } else if (goal === 'competition') { goalMultiplier = 1.1; } // Combine factors and set limits for recurve bows var calculatedWeight = baseFactor * experienceMultiplier * goalMultiplier; // Adjustments for physical strain and typical recurve ranges if (calculatedWeight 65) calculatedWeight = 65; // Practical upper limit for many recurves // Fine-tuning the result and intermediate factors var finalDrawWeight = Math.round(calculatedWeight); // Adjust arrow spine based on final draw weight and draw length (simplified) if (finalDrawWeight < 30) arrowSpine = 700; else if (finalDrawWeight < 40) arrowSpine = 550; else if (finalDrawWeight 1.1) anchorFactor = 1.1; // Cap it if (anchorFactor < 0.9) anchorFactor = 0.9; // Cap it // Simple Physical Strain Index (related to draw weight and experience) if (finalDrawWeight < 30 && experience === 'beginner') strainIndex = 'Low'; else if (finalDrawWeight < 40 && experience === 'intermediate') strainIndex = 'Low to Moderate'; else if (finalDrawWeight < 45 && experience === 'advanced') strainIndex = 'Moderate'; else if (finalDrawWeight = 45) { document.getElementById('advancedBowRow').style.backgroundColor = 'rgba(40, 167, 69, 0.2)'; // Light success green } else if (calculatedWeight >= 30) { document.getElementById('intermediateBowRow').style.backgroundColor = 'rgba(0, 74, 153, 0.1)'; // Light primary blue } } function updateChart(calculatedWeight) { var ctx = document.getElementById('drawWeightChart').getContext('2d'); var chartData = { labels: ['Beginner (25 lbs)', 'Intermediate (40 lbs)', 'Advanced (55 lbs)'], datasets: [ { label: 'Recommended Draw Weight (lbs)', data: [25, 40, 55], borderColor: 'var(–primary-color)', backgroundColor: 'rgba(0, 74, 153, 0.5)', fill: false, tension: 0.1, yAxisID: 'y-axis-weight' }, { label: 'Typical Arrow Spine', data: [650, 450, 300], borderColor: 'var(–success-color)', backgroundColor: 'rgba(40, 167, 69, 0.5)', fill: false, tension: 0.1, yAxisID: 'y-axis-spine' } ] }; var options = { responsive: true, maintainAspectRatio: false, scales: { 'y-axis-weight': { type: 'linear', position: 'left', title: { display: true, text: 'Draw Weight (lbs)' }, ticks: { beginAtZero: true } }, 'y-axis-spine': { type: 'linear', position: 'right', title: { display: true, text: 'Arrow Spine' }, grid: { drawOnChartArea: false, // only want the grid lines for one axis to show }, ticks: { beginAtZero: true, reverse: true // Higher stiffness (lower spine number) is often better for higher weights } }, x: { title: { display: true, text: 'Archer Experience Level' } } }, plugins: { legend: { position: 'top', }, tooltip: { mode: 'index', intersect: false, } }, hover: { mode: 'nearest', intersect: true } }; // Destroy previous chart instance if it exists if (window.drawWeightChartInstance) { window.drawWeightChartInstance.destroy(); } // Create new chart instance window.drawWeightChartInstance = new Chart(ctx, { type: 'line', data: chartData, options: options }); // Add annotation for calculated weight (if possible with native canvas) // For simplicity, we'll rely on the text display and table highlighting. // Native canvas annotations can be complex. } function resetCalculator() { document.getElementById('archerHeight').value = '175'; document.getElementById('wingspan').value = '180'; document.getElementById('drawLength').value = '28'; document.getElementById('experienceLevel').value = 'beginner'; document.getElementById('archeryGoal').value = 'recreation'; // Clear errors document.getElementById('archerHeightError').textContent = ""; document.getElementById('archerHeightError').classList.remove('visible'); document.getElementById('wingspanError').textContent = ""; document.getElementById('wingspanError').classList.remove('visible'); document.getElementById('drawLengthError').textContent = ""; document.getElementById('drawLengthError').classList.remove('visible'); document.getElementById('experienceLevelError').textContent = ""; document.getElementById('experienceLevelError').classList.remove('visible'); document.getElementById('archeryGoalError').textContent = ""; document.getElementById('archeryGoalError').classList.remove('visible'); // Reset results document.getElementById('mainResult').textContent = "–"; document.getElementById('intermediateResult1').textContent = "Arrow Spine Index: –"; document.getElementById('intermediateResult2').textContent = "Anchor Point Adjustment Factor: –"; document.getElementById('intermediateResult3').textContent = "Physical Strain Index: –"; // Reset table highlights document.getElementById('intermediateBowRow').style.backgroundColor = 'transparent'; document.getElementById('advancedBowRow').style.backgroundColor = 'transparent'; // Optionally clear or reset chart if needed, but it's usually okay to leave it. } function copyResults() { var mainResult = document.getElementById('mainResult').textContent; var intermediate1 = document.getElementById('intermediateResult1').textContent; var intermediate2 = document.getElementById('intermediateResult2').textContent; var intermediate3 = document.getElementById('intermediateResult3').textContent; var formula = document.querySelector('.formula-explanation').textContent.replace('Formula: ', "); var assumptions = "Assumptions:\n"; assumptions += "Archer Height: " + document.getElementById('archerHeight').value + " cm\n"; assumptions += "Wingspan: " + document.getElementById('wingspan').value + " cm\n"; assumptions += "Draw Length: " + document.getElementById('drawLength').value + " inches\n"; assumptions += "Experience Level: " + document.getElementById('experienceLevel').value + "\n"; assumptions += "Archery Goal: " + document.getElementById('archeryGoal').value + "\n"; var textToCopy = "Recurve Draw Weight Calculator Results:\n\n"; textToCopy += "Primary Result:\n" + mainResult + " lbs\n\n"; textToCopy += "Details:\n" + intermediate1 + "\n" + intermediate2 + "\n" + intermediate3 + "\n\n"; textToCopy += "Formula Used:\n" + formula + "\n\n"; textToCopy += assumptions; // Use a temporary textarea to copy text to clipboard var textArea = document.createElement("textarea"); textArea.value = textToCopy; textArea.style.position = "fixed"; textArea.style.left = "-9999px"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'Results copied to clipboard!' : 'Failed to copy results.'; // Optional: Provide user feedback (e.g., a temporary message) alert(msg); } catch (err) { alert('Failed to copy results. Manual copy may be needed.'); } document.body.removeChild(textArea); } // Initial calculation on page load document.addEventListener('DOMContentLoaded', function() { // Load Chart.js – Replace with actual path or base64 if needed for offline use var script = document.createElement('script'); script.src = 'https://cdn.jsdelivr.net/npm/chart.js'; script.onload = function() { // Initialize chart after Chart.js is loaded calculateDrawWeight(); // Perform initial calculation to set up chart and table }; document.head.appendChild(script); });

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