{"id":3188,"date":"2026-06-12T10:30:17","date_gmt":"2026-06-12T10:30:17","guid":{"rendered":"https:\/\/washerdrone.com\/?page_id=3188"},"modified":"2026-06-22T05:29:47","modified_gmt":"2026-06-22T05:29:47","slug":"nozzle-calculator","status":"publish","type":"page","link":"https:\/\/washerdrone.com\/es\/nozzle-calculator\/","title":{"rendered":"Calculadora de boquillas"},"content":{"rendered":"\n<style>\n\n  \/* \u2500\u2500 WasherDrone brand tokens \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 *\/\n  :root {\n    --wd-bg:          #E7F6FF;            \/* page background (brand light blue) *\/\n    --wd-surface:     #ffffff;\n    --wd-surface2:    #f1f8fd;\n    --wd-border:      rgba(13,42,79,0.12);\n    --wd-border2:     rgba(13,42,79,0.22);\n    --wd-blue:        #1a8fe3;\n    --wd-blue-dark:   #0f5f9e;\n    --wd-blue-glow:   rgba(26,143,227,0.12);\n    --wd-text:        #0d2a4f;\n    --wd-text-muted:  #4a5a6b;\n    --wd-text-faint:  #8595a6;\n    --wd-success:     #1a7f37;\n    --wd-warn-bg:     rgba(191,135,0,0.12);\n    --wd-warn-border: rgba(191,135,0,0.45);\n    --wd-warn-text:   #9a6a00;\n    --wd-danger-bg:   rgba(207,34,46,0.10);\n    --wd-danger-border:rgba(207,34,46,0.40);\n    --wd-danger-text: #cf222e;\n    --radius:         8px;\n    --radius-lg:      12px;\n    --font:           -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;\n  }\n\n  * { box-sizing: border-box; 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}\n  .wd-article td.prohibited { color: var(--wd-danger-text); font-weight: 600; }\n\n  \/* FAQ *\/\n  .wd-faq-q { font-size: 16px; font-weight: 600; color: var(--wd-text); margin: 1.5rem 0 0.4rem; }\n  .wd-faq-a { font-size: 15px; color: var(--wd-text-muted); margin-bottom: 0.6rem; }\n\n  \/* Author \/ closing note *\/\n  .wd-author {\n    background: var(--wd-surface);\n    border: 1px solid var(--wd-border);\n    border-radius: var(--radius-lg);\n    padding: 1.25rem 1.5rem;\n    margin-top: 2.5rem;\n    box-shadow: 0 1px 3px rgba(13,42,79,0.06);\n  }\n  .wd-author p { font-size: 13.5px; color: var(--wd-text-muted); margin: 0; font-style: italic; }\n  .wd-author a { color: var(--wd-blue-dark); }\n\n  .wd-article .wd-cta-row { margin-top: 1.5rem; }\n\n  @media (max-width: 480px) {\n    .wd-article h2 { font-size: 21px; }\n  }\n\n<\/style>\n\n\n\n\n\n\n\n\n\n<div class=\"wd-tool-page\">\n\n<div class=\"wd-calc\">\n\n  <div class=\"wd-header\">\n    <div class=\"wd-badge\">SkyNozzle Calculator<\/div>\n    <div class=\"wd-calc-title\">Nozzle Orifice Size Calculator<\/div>\n    <p>Enter your SkyJet pressure, flow rate and SkyHose inner diameter to find the recommended nozzle #.<\/p>\n  <\/div>\n\n  <p class=\"wd-label\">Unit system<\/p>\n  <div class=\"wd-unit-toggle\" role=\"group\" aria-label=\"Unit system\">\n    <button class=\"wd-unit-btn active\" id=\"btn-metric\" onclick=\"setUnit('metric')\">Metric (bar \/ lpm \/ mm)<\/button>\n    <button class=\"wd-unit-btn\" id=\"btn-imperial\" onclick=\"setUnit('imperial')\">Imperial (psi \/ gpm \/ in)<\/button>\n  <\/div>\n\n  <p class=\"wd-label\">SkyJet pressure &amp; flow<\/p>\n  <div class=\"wd-grid-2\">\n    <div class=\"wd-field\">\n      <label id=\"lbl-pressure\">Pressure (bar)<\/label>\n      <select id=\"sel-pressure\" onchange=\"calc()\"><\/select>\n    <\/div>\n    <div class=\"wd-field\">\n      <label id=\"lbl-flow\">Flow rate (L\/min)<\/label>\n      <select id=\"sel-flow\" onchange=\"calc()\"><\/select>\n    <\/div>\n  <\/div>\n\n  <p class=\"wd-label\">SkyHose inner diameter<\/p>\n  <div class=\"wd-grid-hose\">\n    <div class=\"wd-field\">\n      <label id=\"lbl-hose\">Inner diameter<\/label>\n      <select id=\"sel-hose\" onchange=\"calc()\">\n        <option value=\"6.35\">1\/4\u2033 \u2014 6.35 mm<\/option>\n        <option value=\"7.94\">5\/16\u2033 \u2014 7.94 mm<\/option>\n        <option value=\"9.53\">3\/8\u2033 \u2014 9.53 mm<\/option>\n        <option value=\"12.7\">1\/2\u2033 \u2014 12.7 mm<\/option>\n        <option value=\"15.88\">5\/8\u2033 \u2014 15.88 mm<\/option>\n        <option value=\"19.05\">3\/4\u2033 \u2014 19.05 mm<\/option>\n      <\/select>\n    <\/div>\n    <p class=\"wd-hose-note\">Based on 50 m hose length<\/p>\n  <\/div>\n\n  <hr class=\"wd-divider\">\n\n  <div class=\"wd-result\">\n    <p class=\"wd-result-label\">Recommended SkyNozzle<\/p>\n    <div class=\"wd-result-main\">\n      <span class=\"wd-result-number\" id=\"res-number\">\u2014<\/span>\n      <span class=\"wd-result-unit\" id=\"res-unit\"><\/span>\n    <\/div>\n    <p class=\"wd-result-sub\" id=\"res-sub\"><\/p>\n    <hr class=\"wd-result-divider\">\n    <p class=\"wd-result-us-label\">US Industry Standard Size<\/p>\n    <div class=\"wd-result-us-row\">\n      <span class=\"wd-result-us-number\" id=\"res-us-number\">\u2014<\/span>\n      <span class=\"wd-result-us-unit\" id=\"res-us-unit\"><\/span>\n    <\/div>\n    <p class=\"wd-result-us-note\" id=\"res-us-note\"><\/p>\n  <\/div>\n\n  <div class=\"wd-insight\" id=\"insight-box\">\n    <svg id=\"insight-icon\" width=\"15\" height=\"15\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" color=\"#1a8fe3\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><line x1=\"12\" y1=\"8\" x2=\"12\" y2=\"12\"\/><line x1=\"12\" y1=\"16\" x2=\"12.01\" y2=\"16\"\/><\/svg>\n    <span id=\"insight-text\"><\/span>\n  <\/div>\n\n  <p class=\"wd-note\" id=\"res-note\"><\/p>\n\n  <div class=\"wd-cta-row\">\n    <a class=\"wd-btn wd-btn-primary\" href=\"https:\/\/shop.washerdrone.com\" target=\"_blank\" rel=\"noopener\">\n      <svg width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"9\" cy=\"21\" r=\"1\"\/><circle cx=\"20\" cy=\"21\" r=\"1\"\/><path d=\"M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6\"\/><\/svg>\n      Shop\n    <\/a>\n    <a class=\"wd-btn wd-btn-secondary\" href=\"https:\/\/washerdrone.com\/contact-2\/\" target=\"_blank\" rel=\"noopener\">\n      <svg width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"\/><polyline points=\"22,6 12,13 2,6\"\/><\/svg>\n      Contact\n    <\/a>\n  <\/div>\n\n<\/div>\n\n\n<article class=\"wd-article\">\n\n  <p class=\"lead\">The calculator above returns a <strong>nozzle #<\/strong> \u2014 the orifice size in 1\/64-inch increments \u2014 for your chosen SkyJet pressure, flow rate, and SkyHose diameter. The guide below explains how to turn that number into a complete <strong>drone pressure washing nozzle configuration<\/strong>: which nozzle type to fit, which hose is mandatory, and what pressure and water temperature each surface demands.<\/p>\n\n  <h2>How the SkyNozzle Calculator Works<\/h2>\n  <div class=\"wd-defn\"><p><strong>The calculator determines<\/strong> the orifice diameter required to pass your specified flow at the pressure actually reaching the nozzle \u2014 not the pressure leaving the pump.<\/p><\/div>\n  <p>It runs in two stages. First it models hose friction loss using the Darcy\u2013Weisbach equation with the Blasius friction correlation, based on a 50 m (164 ft) SkyHose length, water at 20\u00b0C (68\u00b0F), and a density of 1,000 kg\/m\u00b3. This yields the net <em>nozzle inlet pressure<\/em>. Second, it solves the orifice flow equation \u2014 Q = Cd \u00d7 A \u00d7 \u221a(2P\/\u03c1), with a discharge coefficient of Cd = 0.95 \u2014 for the orifice area, then converts that to a nozzle # using the ANSI\/ASME standard where one unit equals 1\/64 inch (0.397 mm).<\/p>\n  <p>The friction-loss indicator matters: when hose resistance consumes more than 20% of pump pressure, the combination is flagged red. The fix is almost always a wider SkyHose, which delivers more pressure to the nozzle and lets a smaller, higher-velocity orifice do the cleaning.<\/p>\n\n  <h2>What Is Drone Pressure Washing Nozzle Configuration<\/h2>\n  <div class=\"wd-defn\"><p><strong>Drone pressure washing nozzle configuration is defined as<\/strong> the complete selection of nozzle type, orifice size, spray angle, hose diameter, operating pressure, and chemical injection mode matched to a specific surface and contamination type.<\/p><\/div>\n  <p>A mismatch at any point in this chain produces one of three failure modes: insufficient cleaning impact, surface damage from an over-concentrated jet, or back-pressure overload on the pump when the orifice is too small for the hose and flow combination. <strong>The key difference between drone and ground-based configuration is standoff distance.<\/strong> A drone works at 0.5\u20132 m (1.6\u20136.6 ft) from the facade, so the jet geometry at the nozzle exit directly governs coverage width, impact force, and drift.<\/p>\n\n  <h2>The WasherDrone Nozzle Family<\/h2>\n  <p>WasherDrone supplies four nozzle types as part of its peripheral product line, each engineered for a distinct role. For a full pre-purchase comparison, see our guide on <a href=\"https:\/\/washerdrone.com\/blog\/nozzle-for-drone-pressure-washing\/\">how to select the right nozzle for drone pressure washing<\/a>.<\/p>\n  <div class=\"wd-table-wrap\"><table>\n    <thead><tr><th>Nozzle<\/th><th>Type<\/th><th>Pressure Range<\/th><th>Primary Role<\/th><\/tr><\/thead>\n    <tbody>\n      <tr><td>Jet Nozzle Pack<\/td><td>Fan jet \u2014 0\u00b0\/15\u00b0\/25\u00b0\/40\u00b0<\/td><td>100\u2013200 bar (1,450\u20132,900 psi)<\/td><td>Precision cleaning; multi-angle versatility<\/td><\/tr>\n      <tr><td>Sweeping Turbo Nozzle<\/td><td>Oscillating jet, 30\u00b0 sweep<\/td><td>60\u2013200 bar (870\u20132,900 psi)<\/td><td>Wide coverage; stone, metal, concrete<\/td><\/tr>\n      <tr><td>Rotary Turbo Nozzle<\/td><td>Rotating jet, 22\u00b0 cone<\/td><td>52\u2013200 bar (754\u20132,900 psi)<\/td><td>Solar panels; delicate or uniform surfaces<\/td><\/tr>\n      <tr><td>Jet Foam Nozzle<\/td><td>Chemical injection<\/td><td>Full range<\/td><td>Pre-treatment; always paired with a cleaning nozzle<\/td><\/tr>\n    <\/tbody>\n  <\/table><\/div>\n  <p>The Sweeping Turbo Nozzle is the de facto standard for most facade scenarios. The Jet Nozzle Pack gives surgical precision for joints and edges. The Rotary Turbo Nozzle is the mandatory choice for solar panels. The Jet Foam Nozzle never cleans alone \u2014 it is always paired with a second nozzle.<\/p>\n\n  <h2>Hose-to-Nozzle Compatibility<\/h2>\n  <div class=\"wd-defn\"><p><strong>Hose-to-nozzle compatibility is the constraint that overrides all other configuration preferences.<\/strong> The wrong hose creates back-pressure that stresses the pump and reduces cleaning performance.<\/p><\/div>\n  <p>This is exactly what the calculator&#8217;s friction-loss indicator surfaces. For a full breakdown, see our guide on <a href=\"https:\/\/washerdrone.com\/blog\/hose-for-drone-cleaning-systems\/\">how to choose the right hose for drone cleaning systems<\/a>.<\/p>\n  <div class=\"wd-table-wrap\"><table>\n    <thead><tr><th>Hose<\/th><th>Inner Diameter<\/th><th>Max Flow<\/th><th>Compatible Nozzles<\/th><\/tr><\/thead>\n    <tbody>\n      <tr><td>SkyHose 5\/6<\/td><td>1\/4 in (6 mm)<\/td><td>11.4 L\/min (3.0 GPM)<\/td><td>Jet Nozzle Pack 3.0 (full range); Sweeping Turbo C30 (max 100 bar \/ 1,450 psi); Rotary Turbo 3.0 (caution at 200 bar); Jet Foam<\/td><\/tr>\n      <tr><td><strong>SkyHose 8<\/strong><\/td><td>5\/16 in (8 mm)<\/td><td>17.8 L\/min (4.7 GPM)<\/td><td><strong>All nozzles \u2014 full pressure range. Field standard. Mandatory for dual nozzle.<\/strong><\/td><\/tr>\n      <tr><td>SkyHose 10<\/td><td>3\/8 in (10 mm)<\/td><td>25.7 L\/min (6.8 GPM)<\/td><td>All nozzles \u2014 full pressure range. Maximum-capacity deployments.<\/td><\/tr>\n    <\/tbody>\n  <\/table><\/div>\n  <p><strong>The operative rule: SkyHose 8 is the field standard.<\/strong> It accommodates every nozzle across the full pressure range and is mandatory for all dual nozzle configurations without exception.<\/p>\n\n  <h2>Application Matrix by Surface Type<\/h2>\n  <p>The table below defines the recommended configuration for each surface encountered in <a href=\"https:\/\/washerdrone.com\/solutions-2\/building-cleaning-with-drones\/\">drone-based facade cleaning operations<\/a>. These combinations are derived from WasherDrone&#8217;s operational testing data.<\/p>\n  <div class=\"wd-table-wrap\"><table>\n    <thead><tr><th>Surface<\/th><th>Nozzle<\/th><th>Qty<\/th><th>Hose<\/th><th>Pressure<\/th><th>Chemical<\/th><th>Hot Water<\/th><\/tr><\/thead>\n    <tbody>\n      <tr><td>Glass facade<\/td><td>Sweeping Turbo C30<\/td><td>1<\/td><td>SkyHose 8<\/td><td>100\u2013150 bar (1,450\u20132,175 psi)<\/td><td>Optional<\/td><td>Optional max 90\u00b0C (194\u00b0F)<\/td><\/tr>\n      <tr><td>Aluminium composite<\/td><td>Jet Nozzle Pack 3.0<\/td><td>1<\/td><td>SkyHose 5\/6<\/td><td>100\u2013130 bar (1,450\u20131,885 psi)<\/td><td>No<\/td><td>Optional max 60\u00b0C (140\u00b0F)<\/td><\/tr>\n      <tr><td>Ceramic \/ coated<\/td><td>Jet Nozzle Pack 3.0<\/td><td>1<\/td><td>SkyHose 5\/6<\/td><td>100\u2013150 bar (1,450\u20132,175 psi)<\/td><td>Optional<\/td><td>Optional<\/td><\/tr>\n      <tr><td>Stone \/ concrete<\/td><td>Sweeping Turbo C30<\/td><td>1<\/td><td>SkyHose 8<\/td><td>150\u2013200 bar (2,175\u20132,900 psi)<\/td><td>Yes<\/td><td>Yes \u2014 90\u00b0C (194\u00b0F)<\/td><\/tr>\n      <tr><td>Construction dust<\/td><td>Sweeping Turbo C30\u2013C35<\/td><td>1<\/td><td>SkyHose 8<\/td><td>150\u2013200 bar (2,175\u20132,900 psi)<\/td><td>Yes<\/td><td>Yes<\/td><\/tr>\n      <tr><td>Metal facade<\/td><td>Sweeping Turbo C30<\/td><td>1<\/td><td>SkyHose 8<\/td><td>150\u2013200 bar (2,175\u20132,900 psi)<\/td><td>Yes<\/td><td>Yes \u2014 90\u00b0C (194\u00b0F)<\/td><\/tr>\n      <tr><td>Solar panels<\/td><td>Rotary Turbo 3.0<\/td><td>2<\/td><td>SkyHose 8<\/td><td>60\u201380 bar (870\u20131,160 psi)<\/td><td>No<\/td><td class=\"prohibited\">PROHIBITED<\/td><\/tr>\n      <tr><td>Large flat facade<\/td><td>Jet Nozzle Pack 3.0<\/td><td>2<\/td><td>SkyHose 8<\/td><td>100\u2013150 bar (1,450\u20132,175 psi)<\/td><td>Optional<\/td><td>Optional<\/td><\/tr>\n      <tr><td>Chemical + rinse<\/td><td>Jet Foam + Jet Nozzle Pack 3.0<\/td><td>2<\/td><td>SkyHose 8<\/td><td>100\u2013150 bar (1,450\u20132,175 psi)<\/td><td>Yes<\/td><td>Optional<\/td><\/tr>\n    <\/tbody>\n  <\/table><\/div>\n\n  <h2>Fan Angle Selection for the Jet Nozzle Pack<\/h2>\n  <div class=\"wd-defn\"><p><strong>Fan angle selection determines impact concentration versus surface coverage.<\/strong> It follows a fixed sequence based on soiling type and geometry.<\/p><\/div>\n  <ol>\n    <li><strong>Localised hard soiling \u2014 joints, corners, recesses:<\/strong> 0\u00b0 point nozzle as a pre-pass; follow with 25\u00b0 or 40\u00b0 for the main wash.<\/li>\n    <li><strong>Wind or extended standoff distance:<\/strong> 15\u00b0 \u2014 maintains impact at greater distances.<\/li>\n    <li><strong>Standard soiling, standard standoff:<\/strong> 25\u00b0 \u2014 the default for most scenarios.<\/li>\n    <li><strong>Light soiling, close standoff, large flat surface, or rinse:<\/strong> 40\u00b0 \u2014 maximum coverage, minimum concentration.<\/li>\n  <\/ol>\n  <p>The 0\u00b0 nozzle is never a standalone cleaning pass on open surfaces \u2014 it is a precision instrument for confined soiling, used before the primary nozzle covers the zone.<\/p>\n\n  <h2>Dual Nozzle Drone Washing Setup<\/h2>\n  <p>A <strong>dual nozzle drone washing setup<\/strong> increases coverage rate and enables two-stage cleaning within a single flight. It is not universally appropriate.<\/p>\n  <h3>When dual nozzle is recommended<\/h3>\n  <ul>\n    <li><strong>Solar panel arrays:<\/strong> 2\u00d7 Rotary Turbo Nozzle 3.0<\/li>\n    <li><strong>Large flat facades:<\/strong> 2\u00d7 Jet Nozzle Pack 3.0<\/li>\n    <li><strong>Chemical plus rinse jobs:<\/strong> Jet Foam Nozzle + Jet Nozzle Pack 3.0<\/li>\n  <\/ul>\n  <h3>When it is not appropriate<\/h3>\n  <ul>\n    <li>Narrow or geometrically complex surfaces<\/li>\n    <li>Corner and joint detail cleaning<\/li>\n    <li>Any scenario where jet interference would degrade impact precision<\/li>\n  <\/ul>\n  <p><strong>Non-negotiable rule: all dual nozzle configurations require SkyHose 8.<\/strong> The combined flow of two nozzles exceeds SkyHose 5\/6 capacity in every case \u2014 and the calculator will flag the resulting friction loss red.<\/p>\n\n  <h2>Hot Water Rules<\/h2>\n  <p>Hot water materially improves performance on biological soiling, grease films, and mineral deposits \u2014 but it is not universally permitted.<\/p>\n  <ul>\n    <li><strong>Solar panels: prohibited.<\/strong> Thermal-shock risk; water above 60\u00b0C (140\u00b0F) on a cold panel risks micro-crack formation. Use ambient-temperature water only.<\/li>\n    <li><strong>Aluminium composite: caution.<\/strong> Maximum 60\u00b0C (140\u00b0F); higher risks adhesive-layer delamination on older panels.<\/li>\n    <li><strong>Stone, concrete, metal: highly effective at 90\u00b0C (194\u00b0F)<\/strong> for algae, moss, hydrocarbon films, and traffic grime.<\/li>\n    <li><strong>Glass facades: operator discretion<\/strong> based on surface age, coating, and joint material.<\/li>\n  <\/ul>\n\n  <h2>Frequently Asked Questions<\/h2>\n\n  <p class=\"wd-faq-q\">What is nozzle # and how is it calculated?<\/p>\n  <p class=\"wd-faq-a\">Nozzle # is the ANSI\/ASME standard notation for orifice size, where one unit equals 1\/64 inch (0.397 mm). The calculator derives it as orifice diameter (mm) \u00f7 0.397, after solving the orifice flow equation for the diameter needed to pass your flow at the net nozzle inlet pressure.<\/p>\n\n  <p class=\"wd-faq-q\">Why does a wider hose result in a smaller recommended nozzle #?<\/p>\n  <p class=\"wd-faq-a\">A wider hose has lower friction loss, so more pump pressure reaches the nozzle. Higher inlet pressure lets a smaller orifice pass the same flow rate, and the reduced diameter increases exit velocity \u2014 which improves cleaning impact at the facade.<\/p>\n\n  <p class=\"wd-faq-q\">Can I use SkyHose 5\/6 for a dual nozzle configuration if I keep the pressure low?<\/p>\n  <p class=\"wd-faq-a\">No. SkyHose 5\/6 has a maximum flow rate of 11.4 L\/min (3.0 GPM), insufficient to supply two nozzles simultaneously at any useful pressure. SkyHose 8 is mandatory for all dual nozzle setups without exception.<\/p>\n\n  <p class=\"wd-faq-q\">What pressure and flow should I use for drone facade cleaning?<\/p>\n  <p class=\"wd-faq-a\">SkyJet pumps run from 150 bar (2,175 psi) at 10 L\/min (2.6 GPM) up to 200 bar (2,900 psi) at 20 L\/min (5.3 GPM), depending on configuration. For standard facade work, target 120\u2013150 bar (1,740\u20132,175 psi) at the nozzle inlet. The calculator subtracts hose friction loss and shows the net inlet pressure for your selection.<\/p>\n\n  <p class=\"wd-faq-q\">Why is 50 m used as the base hose length?<\/p>\n  <p class=\"wd-faq-a\">50 m (164 ft) is the standard SkyHose deployment length for most WasherDrone field operations. Longer runs increase friction loss and reduce effective nozzle inlet pressure. For installations needing a longer hose, contact WasherDrone for a custom calculation.<\/p>\n\n  <div class=\"wd-author\">\n    <p>This guide is produced by the WasherDrone field-engineering team. WasherDrone designs and supplies drone-based pressure washing systems and peripheral components \u2014 including the SkyNozzle, SkyHose, and SkyJet lines referenced here \u2014 to operators delivering professional facade cleaning services across multiple international markets. For product selection or a custom configuration, use the buttons below.<\/p>\n  <\/div>\n\n  <div class=\"wd-cta-row\">\n    <a class=\"wd-btn wd-btn-primary\" href=\"https:\/\/shop.washerdrone.com\" target=\"_blank\" rel=\"noopener\">Shop SkyNozzle &amp; Peripherals<\/a>\n    <a class=\"wd-btn wd-btn-secondary\" href=\"https:\/\/washerdrone.com\/contact-2\/\" target=\"_blank\" rel=\"noopener\">Contact WasherDrone<\/a>\n  <\/div>\n\n<\/article>\n\n\n<\/div>\n<script>\n\nvar unitMode = 'metric';\n\nvar metricPressures = [\n  { label: '20 bar \u2014 290 psi',   value: 20 },\n  { label: '40 bar \u2014 580 psi',   value: 40 },\n  { label: '100 bar \u2014 1,450 psi', value: 100 },\n  { label: '150 bar \u2014 2,175 psi', value: 150 },\n  { label: '200 bar \u2014 2,900 psi', value: 200 }\n];\n\nvar imperialPressures = [\n  { label: '300 psi \u2014 20.7 bar',   value: 300  \/ 14.5038 },\n  { label: '600 psi \u2014 41.4 bar',   value: 600  \/ 14.5038 },\n  { label: '1,500 psi \u2014 103.4 bar', value: 1500 \/ 14.5038 },\n  { label: '2,200 psi \u2014 151.7 bar', value: 2200 \/ 14.5038 },\n  { label: '3,000 psi \u2014 206.8 bar', value: 3000 \/ 14.5038 }\n];\n\nvar metricFlows = [\n  { label: '10 L\/min \u2014 2.64 GPM', value: 10 },\n  { label: '15 L\/min \u2014 3.96 GPM', value: 15 },\n  { label: '20 L\/min \u2014 5.28 GPM', value: 20 },\n  { label: '30 L\/min \u2014 7.93 GPM', value: 30 }\n];\n\nvar imperialFlows = [\n  { label: '3 GPM \u2014 11.4 L\/min', value: 3 * 3.78541 },\n  { label: '4 GPM \u2014 15.1 L\/min', value: 4 * 3.78541 },\n  { label: '5 GPM \u2014 18.9 L\/min', value: 5 * 3.78541 },\n  { label: '6 GPM \u2014 22.7 L\/min', value: 6 * 3.78541 },\n  { label: '8 GPM \u2014 30.3 L\/min', value: 8 * 3.78541 }\n];\n\nfunction populateSelect(id, items) {\n  var sel = document.getElementById(id);\n  sel.innerHTML = '';\n  items.forEach(function(item) {\n    var opt = document.createElement('option');\n    opt.value = item.value;\n    opt.textContent = item.label;\n    sel.appendChild(opt);\n  });\n}\n\nfunction setUnit(mode) {\n  unitMode = mode;\n  document.getElementById('btn-metric').classList.toggle('active', mode === 'metric');\n  document.getElementById('btn-imperial').classList.toggle('active', mode === 'imperial');\n\n  if (mode === 'metric') {\n    document.getElementById('lbl-pressure').textContent = 'Pressure (bar)';\n    document.getElementById('lbl-flow').textContent = 'Flow rate (L\/min)';\n    document.getElementById('lbl-hose').textContent = 'Inner diameter';\n    populateSelect('sel-pressure', metricPressures);\n    populateSelect('sel-flow', metricFlows);\n  } else {\n    document.getElementById('lbl-pressure').textContent = 'Pressure (psi)';\n    document.getElementById('lbl-flow').textContent = 'Flow rate (GPM)';\n    document.getElementById('lbl-hose').textContent = 'Inner diameter';\n    populateSelect('sel-pressure', imperialPressures);\n    populateSelect('sel-flow', imperialFlows);\n  }\n  calc();\n}\n\nfunction calc() {\n  var P_bar    = parseFloat(document.getElementById('sel-pressure').value);\n  var Q_lpm    = parseFloat(document.getElementById('sel-flow').value);\n  var D_mm     = parseFloat(document.getElementById('sel-hose').value);\n\n  \/\/ US Industry Standard calculation uses PUMP NOMINAL values (no friction loss)\n  var P_psi_nominal = P_bar * 14.5038;\n  var Q_gpm_nominal = Q_lpm * 0.26417;\n  var usRaw  = Q_gpm_nominal * Math.sqrt(4000 \/ P_psi_nominal);\n  var usSize = Math.round(usRaw * 2) \/ 2;   \/\/ round to nearest 0.5\n\n  var Q_m3s    = Q_lpm \/ 60000;\n  var P_pa     = P_bar * 1e5;\n  var L = 50, rho = 1000, nu = 1e-6;\n  var A_hose   = Math.PI * Math.pow(D_mm \/ 2000, 2);\n  var v        = Q_m3s \/ A_hose;\n  var Re       = v * (D_mm \/ 1000) \/ nu;\n  var f        = Re > 0 ? 0.3164 \/ Math.pow(Re, 0.25) : 0.02;\n  var dP_fric  = f * (L \/ (D_mm \/ 1000)) * 0.5 * rho * v * v;\n  var P_noz_pa = P_pa - dP_fric;\n  var dP_bar   = (P_pa - P_noz_pa) \/ 1e5;\n  var P_noz_bar = P_noz_pa \/ 1e5;\n\n  var ibox     = document.getElementById('insight-box');\n  var iicon    = document.getElementById('insight-icon');\n\n  if (P_noz_pa <= 0) {\n    document.getElementById('res-number').textContent = '\u2014';\n    document.getElementById('res-unit').textContent = '';\n    document.getElementById('res-sub').textContent = 'Friction loss exceeds pump pressure.';\n    document.getElementById('res-note').textContent = '';\n    document.getElementById('res-us-number').textContent = usSize.toFixed(1);\n    document.getElementById('res-us-unit').textContent = 'nozzle #';\n    document.getElementById('res-us-note').textContent =\n      'Pump nominal: ' + P_psi_nominal.toFixed(0) + ' psi \/ ' + Q_gpm_nominal.toFixed(2) + ' GPM (friction loss not applied)';\n    ibox.className = 'wd-insight danger';\n    iicon.style.color = 'var(--wd-danger-text)';\n    document.getElementById('insight-text').textContent =\n      'Hose resistance exceeds available pressure. Select a wider SkyHose or increase pump pressure.';\n    return;\n  }\n\n  var Cd       = 0.95;\n  var A_noz    = Q_m3s \/ (Cd * Math.sqrt(2 * P_noz_pa \/ rho));\n  var d_mm     = Math.sqrt(4 * A_noz \/ Math.PI) * 1000;\n  var nozzleNum = Math.round(d_mm \/ 0.3969 * 10) \/ 10;\n  var lossPct  = Math.round(dP_bar \/ P_bar * 100);\n\n  document.getElementById('res-number').textContent = nozzleNum.toFixed(1);\n  document.getElementById('res-unit').textContent   = 'nozzle #';\n\n  \/\/ US Industry Standard output (always shown, pump nominal values)\n  document.getElementById('res-us-number').textContent = usSize.toFixed(1);\n  document.getElementById('res-us-unit').textContent   = 'nozzle #';\n  document.getElementById('res-us-note').textContent   =\n    'Pump nominal: ' + P_psi_nominal.toFixed(0) + ' psi \/ ' + Q_gpm_nominal.toFixed(2) + ' GPM \u00b7 Formula: GPM \u00d7 \u221a(4000\/PSI), rounded to nearest 0.5';\n\n  if (unitMode === 'metric') {\n    document.getElementById('res-sub').textContent =\n      'Orifice diameter: ' + d_mm.toFixed(2) + ' mm  |  Nozzle inlet pressure: ' + P_noz_bar.toFixed(1) + ' bar';\n    document.getElementById('res-note').textContent =\n      'Based on 50 m SkyHose. Friction loss: ' + dP_bar.toFixed(1) + ' bar. Cd = 0.95.';\n  } else {\n    document.getElementById('res-sub').textContent =\n      'Orifice diameter: ' + d_mm.toFixed(3) + ' mm  |  Nozzle inlet pressure: ' + (P_noz_bar * 14.5038).toFixed(0) + ' psi';\n    document.getElementById('res-note').textContent =\n      'Based on 50 m SkyHose. Friction loss: ' + (dP_bar * 14.5038).toFixed(0) + ' psi. Cd = 0.95.';\n  }\n\n  var insightText;\n  if (lossPct <= 5) {\n    ibox.className = 'wd-insight';\n    iicon.style.color = '#1a8fe3';\n    insightText = 'Wide hose \u2192 low friction (' + lossPct + '% loss) \u2192 high pressure reaches the nozzle \u2192 smaller orifice is sufficient at this flow rate.';\n  } else if (lossPct <= 20) {\n    ibox.className = 'wd-insight warn';\n    iicon.style.color = 'var(--wd-warn-text)';\n    insightText = 'Hose friction consumes ' + lossPct + '% of pump pressure. A wider SkyHose would deliver more pressure to the nozzle and reduce the required orifice size.';\n  } else {\n    ibox.className = 'wd-insight danger';\n    iicon.style.color = 'var(--wd-danger-text)';\n    insightText = 'Warning: Hose friction is consuming ' + lossPct + '% of pump pressure. Nozzle performance is significantly reduced at this combination. A wider SkyHose is strongly recommended.';\n  }\n  document.getElementById('insight-text').textContent = insightText;\n}\n\npopulateSelect('sel-pressure', metricPressures);\npopulateSelect('sel-flow', metricFlows);\ncalc();\n\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>drone nozzle calculator<\/strong> ensures you select the right nozzle for efficient cleaning.<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/washerdrone.com\/nozzle-calculator\/#faq\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is nozzle # and how is it calculated?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Nozzle # is the ANSI\/ASME standard notation for orifice size, where one unit equals 1\/64 inch (0.397 mm). The calculator derives it as orifice diameter (mm) divided by 0.397, after solving the orifice flow equation for the diameter needed to pass your flow at the net nozzle inlet pressure.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why does a wider hose result in a smaller recommended nozzle #?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A wider hose has lower friction loss, so more pump pressure reaches the nozzle. Higher inlet pressure lets a smaller orifice pass the same flow rate, and the reduced diameter increases exit velocity, which improves cleaning impact at the facade.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I use SkyHose 5\/6 for a dual nozzle configuration if I keep the pressure low?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"No. SkyHose 5\/6 has a maximum flow rate of 11.4 L\/min (3.0 GPM), insufficient to supply two nozzles simultaneously at any useful pressure. SkyHose 8 is mandatory for all dual nozzle setups without exception.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What pressure and flow should I use for drone facade cleaning?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"SkyJet pumps run from 150 bar (2,175 psi) at 10 L\/min (2.6 GPM) up to 200 bar (2,900 psi) at 20 L\/min (5.3 GPM), depending on configuration. For standard facade work, target 120 to 150 bar (1,740 to 2,175 psi) at the nozzle inlet. The calculator subtracts hose friction loss and shows the net inlet pressure for your selection.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is 50 m used as the base hose length?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"50 m (164 ft) is the standard SkyHose deployment length for most WasherDrone field operations. Longer runs increase friction loss and reduce effective nozzle inlet pressure. For installations needing a longer hose, contact WasherDrone for a custom calculation.\"\n          }\n        }\n      ]\n    },\n    {\n      \"@type\": \"HowTo\",\n      \"@id\": \"https:\/\/washerdrone.com\/nozzle-calculator\/#howto\",\n      \"name\": \"How to Use the SkyNozzle Orifice Calculator\",\n      \"description\": \"Find the recommended nozzle # for a drone pressure washing system by entering SkyJet pump pressure, flow rate, and SkyHose inner diameter.\",\n      \"totalTime\": \"PT1M\",\n      \"tool\": [\n        { \"@type\": \"HowToTool\", \"name\": \"SkyJet pump\" },\n        { \"@type\": \"HowToTool\", \"name\": \"SkyHose\" },\n        { \"@type\": \"HowToTool\", \"name\": \"SkyNozzle\" }\n      ],\n      \"step\": [\n        {\n          \"@type\": \"HowToStep\",\n          \"position\": 1,\n          \"name\": \"Select your unit system\",\n          \"text\": \"Choose metric (bar \/ L\/min \/ mm) or imperial (psi \/ GPM \/ in) at the top of the calculator.\"\n        },\n        {\n          \"@type\": \"HowToStep\",\n          \"position\": 2,\n          \"name\": \"Enter SkyJet pressure and flow\",\n          \"text\": \"Select the SkyJet pump outlet pressure and flow rate that match your configuration.\"\n        },\n        {\n          \"@type\": \"HowToStep\",\n          \"position\": 3,\n          \"name\": \"Select SkyHose inner diameter\",\n          \"text\": \"Choose the inner diameter of the SkyHose you are running. The calculation assumes a 50 m (164 ft) hose length.\"\n        },\n        {\n          \"@type\": \"HowToStep\",\n          \"position\": 4,\n          \"name\": \"Read the recommended nozzle #\",\n          \"text\": \"The calculator returns the recommended SkyNozzle # along with the orifice diameter and the net nozzle inlet pressure after hose friction loss.\"\n        },\n        {\n          \"@type\": \"HowToStep\",\n          \"position\": 5,\n          \"name\": \"Check the friction-loss indicator\",\n          \"text\": \"Review the friction-loss insight. If loss exceeds 20 percent of pump pressure, select a wider SkyHose to deliver more pressure to the nozzle.\"\n        }\n      ]\n    }\n  ]\n}\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SkyNozzle Calculator Nozzle Orifice Size Calculator Enter your SkyJet pressure, flow rate and SkyHose inner diameter to find the recommended nozzle #. 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