There are two charts here, one for 2-stroke engines and the other for 4-stroke. The following table uses the same format to show prop sizes for 4-stroke IC engines. language. Schwabmnchen, July 15th and 16th, at Glider-it (boot 45), 6/17/22 - eCalc RC aviators who understand something of the basic mechanics tend to make better pilots too. In fact, when you hear an rc airplane flying it's more than likely the propeller that you're hearing more than the engine. document.getElementById("ak_js_2").setAttribute("value",(new Date()).getTime()); I love diving into the latest and greatest in emerging technologies and seeing what they can do. Most of these are good common sense routines, but theres no harm in repeating them. The diameter of the propeller (10" in the example above) will also effect how the airplane flies, but also how the engine runs and, again, following your engine manufacturer's recommendations is the place to start. eCalc's updated: BYD Dolphin, Seat Born, 9/28/21 - Motor Database Most engines / motors will come with propeller size information, likely this will be a range of suitable sizes. Drive Calculator 3.4 fr Linux (experimentell) (Zip-Archiv, 4 MByte) 11/4/21 - Sign-up now and become an eCalc nearer to the hub of the propeller), the AoA has to be greater to generate a similar amount of thrust being generated at the faster moving tips. The second number, pitch, is the length of the props twist section. So if you're looking for an exhilarating, rewarding, addictive and very fulfilling hobby, please enjoy my pages - and I wish you many future happy landings! Thereafter all visitors may use your motors for calculation. Copyright document.write(new Date().getFullYear()) Website Acquisitions Inc. All rights reserved. With too big a propeller, the motor will just keep working harder and harder to spin the extra load, until something (likely the ESC) overheats and catches fire. Thats why propellers have curved surfaces or airfoil sections like fixed wings. So, what are starting and alternative props?. 
Technik XI - Luftschrauben, schneller als die Pitch erlaubt. Drain Efficiency added - "How many km/mi you can drive on 1kWh of Download. The prop selection for electric powered (EP) RC is not as straightforward as it is with IC engines. Maybe youre building a plane from a kit that doesnt include props, or you want to upgrade the stock options? Our brand new hacker eCalc setup calculator can help. It does this by reading the propellers current-draw through the models ESC and its motor. See rig testing 5/9/21 - Motor Database Think of the propellers on your RC aircraft as carefully engineered rotating wings. It doesnt know the drag profile or weight of your model. In the following you have the option of making your cookie settings. It has a large and growing database of motors, propellers, escs, and batteries. {5} is the current at full throttle, {6} shows curves of efficiency versus throttle for the motor with that voltage source/battery. In the background, these areas of the CLI have indexes, which give each line of Read more, There are s few different types of receiver, when it comes to the FrSky ecosystem. Static thrust and static propeller speed are shown in {7}. You can use this propeller speed calculator to estimate the rotational speed of your prop. Ask me how I know . Copyright Pete Carpenter / RCAirplaneWorld.com 2002-2022. The 'twist' in the propeller is there to create the essential Angle of Attack of each blade, just like a wing has an AoA. Get Drive Calculator Datenbank (inklusive Updates bis 05.09.2020), The Excel based Drive Calculator 2.21 is still available If choosing a three or four bladed propeller over a two bladed one, a very general rule of thumb is to decrease the prop diameter by an inch and increase the pitch by an inch. Introducing the Dolphin, ESP32 Radar: Finding your friends in the sky. There are countless stories of model pilots losing fingers, or suffering horrendous lacerations to skin on their hands and arms. T-Motor U13II, analysis of multi-motor airplane performance, The membership for full functionality is not There may not be official recommendations, but that doesnt deter RC enthusiasts from testing. Thank you to Marc Hoffmann for coming up with this. Too small a propeller on an EP motor won't do any damage, but you won't get the required performance from your plane. english unit translation corrected, Bug fix for AC Class Most radio-controlled craft at the hobby level use two blades, but theyre not the only options. please report to How to for adding tested motor data to Drive Calculator by Ken Myers (, Online motors and propellers graph tool + theory. 
Spitz C35xx, C28xx / Emax Eco II / Pichler Pulsar, Drive Drive Calculator 3.4 for Windows (Zipped Archive, 5 MByte) Knowing how a radio-controlled model takes to the air is as exciting as flying it. UNDER-propping EP motors is less of an issue. This is above Mach 0.92. All Markus Mueller is expressly prohibited. This short guide gives a simplified explanation of whats an otherwise complex topic. w&bCalc 1.0: all FPV Component selection, Beginners iNav build academy: 1. crimp contacts, Para-RC replacement line - main line Cloud 0.5 Dyneema 0.25mm yellow (2 pieces). trk. updated: Leomotion L5061, 3/9/22 - Motor Database Prop diameter directly influences the amount of thrust generated, but an ever-increasing and non-performance related issue these days, linked to rc airplanes, is that of noise. Thrust is generated in exactly the same way as lift is generated by the wing, and that's why props have a profile airfoil section. 
Measuring motor power without standard props, by running the motor with a calibrated "stick" fitted in place of the propeller prop: Adam One Motor/Prop and Thrust calculators (freeware), RC E-Calc - Electric flight calculator for Android phones. Skalar 10 (1:10 Onroad // 1:10 Offroad 2WD / 4WD / 2WDSC), SPS safety switches for electronic drives, Transmitter - Receiver - Central Box - Accessories, JETI Duplex 2.4EX REX receivers with or without stabilisation system, Stream-Fan ducted fan sytems 70mm (2.76in), Stream-Fan ducted fan sytems 90mm (3.54in), Stream-Fan ducted fan sytems 100mm (3.94in), Stream-Fan ducted fan sytems 110mm (4.33in), Stream-Fan ducted fan sytems 120mm (4.72in), JR servo plugs (couplings) incl. meet us at the Is a 945 prop a 153 prop? I enjoy running when I'm not thinking about tech. You can also search for a motors KV, weight, etc. As with everything, trial and error is going to play a part in your propeller selection. Instantly, the full throttle analysis will appear. Group eCalc or the Well hopefully this article has given you an understanding of propellers used on rc airplanes, and an idea of how to select the right size propeller for your model. Don't delay, get it today! The first number is the arc diameter created by the spinning prop i.e. Getting chase footage or just following each other through proximity gaps to see who doesnt crash. Anleitung zu Drive Calculator 3.4 (im Web Browser zu lesen), Download: updated: T-Motor F-Series, 11/20/21 - Motor Database 3D Insider publishes news, tutorials, and reviews about the latest emerging tech. Your motor will have a limit to the number of amps it can handle. For the contracted Green indicates a good choice if you are looking to fly fast. SunnySky X3120, 6/24/21 - ESC Update: EP The drag of the air on the propeller will cause friction, and a loss in rotational speed. The commercial use without any contract with Solution for There should be prop size recommendations from the manufacturer in each case. 4/12/21 - Tenergy High Precision RC Watt Meter & Power Analyzer, 10-6, 10-7, 11-4, 11-5, 11-7, 11-7.5, 12-4, 12-5, 10-6, 10-7, 10-8, 11-7, 11-7.5, 12-4, 12-5, 12-6, 11-7.5, 11-7.75, 11-8, 12-8, 13-5, 13-6, 14-5, 14-6, First number: diameter (length) of the imaginary disc (arc), Second number: pitch, the length of the angle of the twist on an RC prop, ALWAYS install the propeller with the curved side facing forward, ALWAYS use the correct sized wrench to tighten the bolts or nuts, ALWAYS recheck the bolt or nuts tightness, especially with wooden props, ALWAYS test the new props AT LEAST 20ft. Thus, a higher pitch value typically donates a faster aircraft. APC props, How to add tested motor data to Drive Calculator by Ken Myers (, Theory and profiles by dr. Helmut Quabeck, Motor equations by Stefan Vorkoetter, author of. Following the manufacturers specific size recommendations is advisable in these cases. Published by Mr. D on 23/03/202023/03/2020. It is shown, since that ESC was used to gather the motor test data entered into the database. Its totally safe and 100% accurate. The motor will draw more and more current as it tries to keep up with its Kv rating (the number of RPM it has been designed to turn, per each volt fed into it). But put an oversize prop on an electric motor and the motor will just keep on trying to turn the prop. Thats 4 inches in our example. eCalc Version Alternate props are suggestions for skilled pilots who want to fine-turn their models performance. Segelflugmesse Theyre ideal for use with any craft made for that engine size. Doesnt explain what is meant by a 945 or a 1170 propeller as listed in the Leopard motor table for example. No, is the short answer. Content by Pete Carpenter. You'd be forgiven for just thinking of your rc plane's prop as the thing that pulls the plane along, but understanding a bit about exactly how propellers actually work is no bad thing. Tunigy SK3-5055-280, Surpass X11xx & X14xx, Flywoo NIN 2303.5, 5/18/21 - Motor Database: OK, that about concludes this RC prop size calculation guide. Theres a general rule for choosing 3 or 4 bladed propellers that looks like this: It may not be that simple, though. The approach is more complicated but perfectly doable using a simple watt meter. Your email address will not be published. Without activated cookies you can not shop in this shop. BrotherHobby Avengaer, RockAmp, motor database is the most comprehensive on the web. Learn more about Drive Calculator: In this example, it shows an analysis of one of the motors used in the MiniTalon Build example. full motor list. By scrolling through propellers in the list, you can instantly see the effects on the results. this form and we will update our database with your motors. available in 19 languages: After opening the application, you can select {1} the exact battery to be used,or the voltage to run the analysis, {2} the motor from a large database of motors/test data, and {3} the propeller to be used, again from a large database included. Drive Calculator 3.4 for Linux (experimental) (Zipped Archive, 4 MByte) Personally, if you're an EP flyer, I would say that a Watt meter is as essential as your battery charger! Always measure/check current in a new/changed setup. For inveterate experimenters and motor builders, web.archive.org/web/20161012020813/http://flbeagle.rchomepage.com/software/webocalc_1.7.6/webocalc.html, WebOCalc - Free, easy power system help! Pepper 2524, Xnova T Serie, iFlight Xing2 18xx, T-Motor F30, 5/19/22 - Motor Database Going over this limit will likely melt your motor. Products Aer-Series added. So pitch measurement is really only a theoretical value, but it is good enough to help you choose the right size propeller for your airplane's performance requirements. The Drive Calculator database contains tablesfor batteries, ESCs, gear boxes, motors, propellers, and stators. A simple guide to a great model, iNav Current Sensor Calibration the old mAh method, Five Flight Modes using One Radio Channel, Five Flight Modes & Arming using One Channel, FrSky SxR Alternative Flight Mode Switching, FrSky Receiver Compatibility Tool: Make receiver selection easy, iNav Stick Commands for all transmitter modes, Transmitter Sound Pack: Simple phrase page generator, Beginners iNav build academy: 2. Spitz C35xx, C28xx / Emax Eco II / Pichler Pulsar, 12/10/21 - Motor Database Keep safe! There you will see all items which we have recently added to our shop. new So, with both engines and props spinning at identical RPM, and everything else being equal, the higher pitch prop will travel further in the same amount of time - hence a faster flying plane. It calculates the theoretical maximum speed of your propeller, based on the prop pitch. every single complete turn of the prop). to API 3.0 for USA, 2/7/22 - Motor Database I've found it much better at predictions and efficiency calcs, since it uses a much more advanced prop model (not just thrust coefficients). Wrong propellers have the potential to cause major damage to other components. MAD, 10/18/21 - document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Subscribe to our newsletter to get interesting stories delivered to your inbox! The screw with the coarse thread will cut into the wood faster than the fine threaded screw will. Over-propping can do irreparable damage to electric motors and particularly ESCs, because an oversized propeller will force the motor to work harder than it was designed to. german to any other The prop is on the red-line, close to the maximum speed it can handle, before losing efficiency. Although this chart is related to Top Flight's Power Point range of props, the size ranges suit all brands. Its all great fun. how to use The problem here is that the motor is forced to work harder than the makers designed it to. Here's my spreadsheet (have EDF version too); its helped me with these and others: Prof. Drela has recently released a windows version of QPORP, his motor/prop analysis software. updated: new brand Tempest, 12/10/21 - Motor Database 7.25 - What's new? Drive Calculator is a free tool for brushless motor power system analysis and prop/motor selection. to measure the decalage of V-Tails, eCalc - Berechnungsprogramm fr die Antriebsauslegung, Auslegung VIII - Edge V3 (Teil 1, Evaluation), Auslegung IX - Edge V3 (Teil 2, Auslegung & Bau), Auslegung X - Edge V3 (Teil 3, Verifikation und Erstflug), Auslegung XI - setupFinder - Einfach Antriebe finden, Auslegung XII - BEC-Backup - Einfach und effektiv, Technik IX - Servo und BEC dimensionieren. So while this calculator will give a good idea of the speed of the propeller; it is your responsibility to make sure that the motor can handle the current the prop will pull. updated V7.26 for details see Release If you want some gory evidence of what props can do, just Google "rc propeller injuries" and you'll soon see. A single blade prop must be balanced with a counterweight on the other side of the hub to the blade, otherwise the plane would shake itself to pieces as soon as the prop was turning! iNav CLI Sharing Tool: Lets make things easy. Simply put, props are nothing more than vertically mounted rotating wings. Always take great care around a spinning prop and treat it with the utmost respect. Technik X - Getriebe- oder Direkt-Antrieb? Remember to follow your engine/motor manufacturer recommendations whenever you can, and use a Watt meter if you are going to experiment with different propeller sizes for EP rc planes. In this environmentally-sensitive world that we live, this is a serious consideration when selecting a propeller, especially if your flying site is 'noise sensitive' (eg close to houses etc.). So if two props are close to the optimum speed, but one is slightly over, you may still want to test both. updated: iFlight XING2, T-Motor Terms But what if you want to experiment with different sized props than the stock suggestions? The membership for full functionality is not That said, fuselage and ground clearance issues might dictate which propeller size you can and can't have on your plane. evCalc: updated: T-Motor AT7xxx, FMS. from Gerd Giese's website elektromodellflug.de. 1.40: - Drive - For more useful things, please check out my YouTube Channel. We support direct advertisement on eCalc to maximize your advertising return with a unique, strong and focused target audience. to API 3.0 for USA, BotherHobby 3008, LA 2005 / Adding more blades decreases the overall efficiency of the prop because each blade has to cut through more turbulent air from the preceding blade. Novice pilots are keen to start, but this is one area where slow is the fastest approach. Can I use 5 instead of 6S LiPo? Matching a prop to an IC engine is easy if you follow the general recommendations outlined in the above chart, which have long been accepted in the hobby. The propeller tips are moving too fast, which causes shock waves at the tips and the air detaching from the blades. The picture to the right approximately illustrates how the Angle of Attack varies along the blade length. Some hobbyists still prefer 3 and 4 bladed props, usually for style reasons. Ball park figures. Thats because the operating speeds and loads can vary significantly between models. Thats what this short, no-nonsense introduction covers. This article has helped 12112 people. Drive Calculator 3.4 Manual (opens in web browser), Download: experienced RC Pilots willing to translate eCalc from english or Customers in USA, Canada and South America please also see the offical Hacker Motor USA distributor. However, the pitch measurement must only be taken as a guideline because real-life factors influence the actual distance eg the prop material, its condition, efficiency, air density on the day etc. Interested in a commercial updated: Emax Eco, Turnigy C50xx, SK8, Projekt using eCalc. perfCalc 1.1: updated: new brand HGLRC, 5/12/22 - Motor Database In the worst case scenario, the wrong prop can cause serious damage to components and this is especially true for electric powered rc airplanes. You have disabled the cookies in your browser. Props work by converting the power from the engine or motor into thrust. Franck Aguerre's calculator, he is a renowned French e-flight expert: Lots of prop info, data, tests, theory and links in Louis Fourdan's sticky. You may need to purchase appropriate plugs for the meter if you dont already have them. Required fields are marked *. We use cookies on our site, for example to be able to use the shopping cart or to improve the shopping experience. In fact, a single blade propeller is the most efficient but these are rarely (almost never!) EV Database Even a small size plastic propeller can hurt and cut skin, so imagine what the bigger ones can do. Drive Calculator is a tool for DC motor analysis and the computation of the complete powersystem for electrically powered model aircraft. Blue indicates a good choice for endurance, efficiency, and quietness. Drive Calculator 3.4 Liesmich (im Web Browser zu lesen) Each table has three columns that show the engine size, starting props, and alternate props. As with IC, electric motor manufacturers give a specific propeller size range for their motors but it's more critical that the range is adhered to. It just keeps trying until it eventually overheats or catches fire. I will compile the calculators mentioned in this thread, in this first message. Therefore, theres little to no room for flexibility or trial and error. Please contact us by email: info[at]ecalc.ch. tasks: Since 2004 eCalc provides web-based quality services to Drive Calculator and Propeller Calculator are Freeware and may not be used for commercial purposes (There wont be any spam. The twist is greater towards the hub of the prop because of varying airspeeds along the length of the blades, and hence varying thrust generation. Servo Driver eliminating the need for a receiver during motor measurement, FASST-Modul (2,4GHz) an herkmmlichen Sendern, Multiplex radio with Assan or Jeti 2.4ghz module, Assan- oder Jeti-Modul (2,4GHz) an Multiplex-Sendern, Multiplex Profi MC 3030, MC 4000, Royal Evo w/ FASST TM-8, Drive Calculator 3.4 for Linux (experimental), Drive Calculator database (including all updates until 2020-09-05), Drive Calculator 3.4 fr Linux (experimentell), Drive Calculator Datenbank (inklusive Updates bis 05.09.2020). We would also like to use cookies to create anonymous statistics or to improve the personal shopping experience. The site is brought to you by me, Pete, a middle-aged guy who just refuses to grow up. SunnySky FixedWing, 5/31/21 - Motor Database: While not exact, due to component variations, etc. RC props generate thrust in the same way that wings create lift. The watt meter tells you if the EP prop is a good match for your bird. Battery Capacitiy", 9/28/21 - - analysis of multi-motor airplane performance, 8/27/21 - Motor Database A bigger diameter results in more thrust and noise. cgCalc 2.0: all Dualsky EG series, OpenChargeMap Charge Station retrival updated updated: Surpass X35xx, X41xx, MT22xx, iFlight XING2, Likewise, you can choose and HOLD a voltage/battery, and/or propeller, and see the results as you scroll through motors in the database. Heeding such advice is the quickest and most stress-free way. hrvatski, italiano, , , Nederlands, , polski, portugus, , added Leomotion L4031 F5B Competition, Eachine, T-Motor V & U. Drive Calculator 3.4 fr Windows (Zip-Archiv, 5 MByte) The higher the pitch number, the more bite the prop takes out of the air. So you can see that selecting a different propeller pitch size is going to significantly change your airplane's performance, with speed being the primary factor. away from onlookers, ALWAYS keep hands well clear of spinning props, ALWAYS keep faced & body clear of the props arc after starting the engine/motor, ALWAYS make fine adjustments from behind the prop (except pusher props), ALWAYS keep loose clothing well clear from spinning propellers, NEVER throw something into the path of spinning props to kill the engine, ALWAYS discard damaged props. commercial users the you read in your prefered RC Magazine - info[at]ecalc.ch. correction, 5/11/21 - Motor Database: Most propellers used in the rc flying hobby have two blades, but props with three or even four blades are available. - RCG, www.rcwebclub.com/Portals/1/How_to_Use_PropEngine_09172013.pdf, play.google.com/store/apps/details?id=appinventor.ai_graham_dyer.RC_Ecalc_Pro, Excel programs for estimating model in-flight performance- RCG, e-flight calculators (compilation) - post #252, Motor Data - test bench data for several hundred brushless motors - RCG, www.apcprop.com/technical-information/performance-data, APC-E Propeller Static Thrust & Power Nomograms - RCG, Measuring Brushless Motor Resistance (Two Digital Meter Method) - WFF, Several diy test rig designs, thrust and dynamoter, Feature Article - Motor constants, how to find them and use them - RCG, www.astroflight.com/explanation-of-motor-terminology.html, krex.k-state.edu/dspace/bitstream/handle/2097/1507/JamesMevey2009.pdf, http://www.gobrushless.com/testing/tcalculator.php, http://www.adamone.rchomepage.com/calc_motor.htm, https://www.rcgroups.com/forums/showthread.php?t=736782, https://www.rcgroups.com/forums/show.php?t=1388429, https://www.rcgroups.com/forums/show0#post12693433, https://www.rcgroups.com/forums/show819392&page=25, http://web.mit.edu/drela/Public/web/qprop/, https://www.rcgroups.com/forums/show.php?t=1077012, https://www.rcgroups.com/forums/show44#post8108089, http://www.s4a.ch/eflight/motorcalc_e.htm, e-flight calculators (compilation), internal link, The following errors occurred with your submission, The simple effect of pitch and number of blades, and the. - RCG, WeboCalc - Free software for choosing motors - Part III - RCG, www.gobrushless.com/testing/thrust_calculator.php, www.rcgroups.com/forums/showatt.php?attachmentid=1621267, Power Systems for Extreme Flight Fanatics! The prop is operating in a window below Mach 0.62, which will not over stress the motor. Extra blades reduce efficiency as theres more turbulent air to cut through from the preceding prop. Radio control propeller size selection can be a minefield, especially for the beginner to the hobby, so outlined below are some generally accepted guidelines and recommendations for choosing the right prop for your rc plane. Either follow the makers recommendations or use the tables below for guidance. The prop's job is to convert the motor power in to thrust, to pull/push the plane through the air. Theres both ground and fuselage clearance to consider, and thats something pilots need to work out depending on the model. electric brushless motor drives for RC pilots of airplane, multi rotor, UAV, helicopter and EDF jets. Lets, face it. updated: EMAX GTII, Selecting the correct propeller for your rc airplane is crucial if you want to get the optimum performance from your plane, regardless of its power type. or copied and passed on for profit. Try not to let excitement and enthusiasm make you impatient or rush you along. Fitting an incorrect prop would mean the engine would still run, but your plane would perform poorly. Further information can be found in our data protection information.
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