The higher the Rm, the less efficient the motor is. Kt is the "Torque Constant". Other ways of configuring the motor to handle the same power in different ways are needed. trainer type airplane. It is also a good idea to have a basic understanding of the difference of brushed  vs. brushless rc electric motors. Think of the propellers on your RC aircraft as carefully engineered rotating wings. Outrunners brushless motors generally have a lower Kv, which in turn produces more torque at a slower speed for spinning those larger props. maybe 150-200 Watts/lb. This difference in thrust generation occurs because the tips of the prop blades move faster than inner portions of the blades, so the AoA has to change accordingly along the length of the blades; more thrust is generated at faster speeds, just like more lift is generated over a faster moving wing. Enter the Prop Diameter and Pitch in inches (in.) Over time it can damage the engine’s bearings, motor, and even the airframe. new to the hobby. Aircraft's flight characteristics (based on wing loading and lift), the combination motor/propeller, the motor's efficiency (Pout/Pin) and last but not the least, the batteries energy/weight ratio. You motor is the power plant of your plane. The picture to the right approximately illustrates how the Angle of Attack varies along the blade length. ... Engine Size: Ideal Prop Size. Propeller Size Range: Ideal RPM Range: 0.26-0.30: 10x6. Balancing RC plane propellers is vital because it reduces or eliminates vibration. When shopping for RC electric motors, it's important to understand what all those numbers and specs really mean. You can see that the higher pitch prop (eg 10x8) takes only one and a half turns to cover the same distance that the lower pitch prop (eg 10x4) takes 3 turns to. For example: let's assume we have a 5055-3000kV Brushless Outrunner Motor. To control the elevator, rudder, and ailerons you will need small motors, called servos. When shopping for RC electric motors, it's important to understand what all those numbers and specs really mean. Most adapters are sized to fit a specific motor brand or size of motor shaft; see each product page for details. Io is the "No Load Current". it blind. The manual for most ARF'S and kits these days make it really easy for you by Everyone knows that propellers on RC planes, drones, and helis are fast-spinning blades. For safe, enjoyable flights, you need to install the electric motor in your RC airplane correctly. At slower speed (i.e. No harm done. The screw with the coarse thread will cut into the wood a lot faster than the fine threaded screw will. An exhilarating, addictive and highly rewarding hobby indeed, and one that I can highly recommend you try! Understanding the basic fundamentals outlined here is essential for choosing a suitable motor for your airplane. Propeller size is the output of a good harmony among Airplane weight, Engine size, Type of plane we fly. When you hear the words electric RC aeroplane, the first thing that comes to mind is a park flyer. Copyright© Pete Carpenter / RCAirplaneWorld.com 2002-2020. It's the same for propellers 'cutting' through the air (hence the reason why propellers are sometimes called airscrews). flight without having to worry about sizing the components, there are Two-bladed propellers are commonly used because they are relatively efficient and easy and cheap to produce but sometimes an rc airplane will call for more blades, particularly where a scale look is required. Well hopefully this page 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. An easy way to estimate power needs for RC hobby applications is to use 100 watts per pound for sport flying, 150 for aggressive aerobatics, 200 watts per pound for 3D flying. The prop's job is to convert the engine power in to thrust, to pull/push the plane through the air. For marketing purposes, they will obviously If you're completely new to the hobby, now's a good time to get familiar with the basic components of electric powered RC airplanes. The pitch measurement of a prop indicates how far, in inches, that propeller will move through the air per single revolution of the engine (i.e. The larger the model, the more critical prop balancing becomes. One cannot choose a motor, propeller, battery, and possibly a gearbox in isolation. The motor will turn your propeller at a high speed … The motor will draw more and more current as it tries to keep up with its Kv rating - the number of revolutions per minute it has been designed to turn, per each volt fed into it. The subject of radio control propeller size selection can be a bit of a minefield, especially for the beginner to the hobby, but outlined below are some generally accepted guidelines and recommendations for choosing the right prop for your plane. Note: There are MANY ways to choose an electric power system for an electrically powered, or glow conversion to electric power, plane. A lot of modelers still use them and would not consider anything else! flight without having to worry about sizing the components, there are Undrestanding and Choosing Lipo Battery Packs, Home So, with both engines and props spinning at identical RPM, the higher pitch prop will travel further in the same amount of time - hence a faster flying plane. Fitting an incorrect prop would mean the engine would still run, but your plane would perform poorly. Alternatives A: Select Propeller first and choose engine and Lipo battery as needs be. motor with comparable power and KV rating. Enter the LiPo cells in series. In short, the power system for an electric plane must be chosen as a system. These planes are light weight, small, and can be flown anywhere. Because every choice of component affects the MOTORS. If you want some gory evidence of what props can do, just Google "rc propeller injuries" and you'll soon see. For example if we want to fly trainer plane the weight to power ratio of at least one to one should be fine. Kv is the "Voltage Constant". This is a content-based site, here to introduce you to the thrills and spills of radio control flying. The only accurate way to know whether or not your EP propeller is resulting in the correct current draw through the ESC and motor is to use a Watt meter connected between battery pack and ESC, as the video below shows... A Watt Meter is essential if you're going totry different prop sizes on your EP plane! It goes without saying that selecting the correct propeller size for your rc airplane is very important if you want to get the optimum performance from your IC engine/electric motor and plane. This may be OK for a small fast flying aircraft but be unsuitable for other aircraft. Servo Motors. The existing ESC (30A) should be good for most motors that run on 3s. Choosing RC electric motors for your RC airplanes isn't quite as straight 10x5~7, 11x4~5: 10000~11000rpm: 0.40-0.45: 11x6. | Affiliate Disclosure. Calculating Brush-less motor and prop size for RC Airplanes. If you put an oversize prop on an IC engine, the engine will likely stall. Welcome to my website, RC Airplane World. Flight time in minutes = (battery capacity / average current drawn) x 60. A higher pitched prop allows the boat to move faster by travelling a farther distance with each rotation. It’s not rocket science, at least not at a basic level. A less than perfect landing, with the prop tips just clippingthe runway, usually results in a chipped or broken prop! But there are generally recognised prop size ranges for each engine size and these are the sizes to choose if you're unsure about propeller selection. Even a small size plastic propeller can hurt and cut skin, so imagine what the bigger ones can do. RC Airplane Propeller Adapters We carry a wide variety of RC airplane propeller adapters in both pressure fit collet-style and bolt-on formats. If you can't get the info from an instruction manual, get online and ask in an internet forum - someone somewhere will know! New to RC flying? Content by Pete Carpenter. You may want to lower this number for a high lift Never ever underestimate the potential for an rc plane propeller to do serious damage. On the same 10 Volts the prop RPM is 20,000/3 giving a prop RPM of 6,666. But, the 11x5 prop will cause the motor to draw more current. A faster turning propeller (and props can easily turn in excess of 10,000 RPM) generates a lot of noise as the tips cut through the air. Always always take great care around a spinning prop and treat it with the utmost respect. In the illustration below, the two arrow lines represent the path of each propeller tip. Too large of a prop will not allow the prop to reach its best RPM efficiency range and will cause heat build up in the ESC, Motor or Batteries. The first and foremost plan of attack is to follow the engine/motor manufacturer's recommendations for the engine or motor that you have. Compared with traditional motors, brushless motors have better speed, greater power, are light-weight and have a greater longevity. Choosing (1) and (2) is quite straight-forward, as most spinners for folding props are packaged with the shaft adaptor and you will see folding propeller spinners listed for example as 50mm spinner for 5mm shaft. Gator-RC is your source for radio control vehicles, airplanes and accessories. Example “4” Enter the motor kv provided by the manufacture The Tip and pitch speed of the prop is calculated in km/h. Electrically Powered or Glow Conversion Prop Plane By Ken Myers Original date of publication March 2017 Article and Spreadsheet Workbook updated December 2019. This is the internal resistance of the motor measured in Ohms. Simply multiply the current by the battery voltage to get power. 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 first number is the diameter of the imaginary disc ('arc') created by the spinning prop i.e. You up to speed with motors, batteries and ESC's? The 'twist' in the propeller is there to create the essential Angle of Attack of each blade, just like a wing has an AoA. But with the advent of electric power (EP), propeller selection became a whole new minefield! If you'd rather use a different brand all you have to do is find another For example, if you apply 12volts to a 200Kv motor, it will turn at just under (12 x 200) 2400 RPM's. A more efficient propeller will transmit more power to the air. Essentially, the higher the pitch value, the faster your plane will go. Propellers for rc airplanes are nothing more than vertically mounted rotating wings. Too much vibration is potentially harmful to the model. The cheaper way to go, to start with, would be to try a bigger prop, like a 6X4 (or 6X4.5 or 6X5). Get my downloadableRC Beginner's Guide.Updated for 2020! The subject of radio control propeller size selection can be a bit of a minefield, especially for the beginner to the hobby, but outlined below are some generally accepted guidelines and recommendations for choosing the right prop for your plane. forward as ordering the recommended size glow engine. A lower pitched propeller will create more power due to more engine RPMs, but the boat will move slower. It is Get my popular ebook today, to help you on your way! with. 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. Use the f In fact, a single blade propeller is the most efficient but these are rarely (almost never!) Choosing An Electric Power System 1) Determine the flying weight of the plane and multiply flying weight by 50, 100, or 150 depending upon plane type and expected performance (50 for Cub-like or Trainer, 100 for Sport Aerobatics, or 150 to 200 for 3D, EDF, and high performance) The result is power in watts needed from the motor at full throttle. > This is a very common size of prop for planes in that size range. Electric Motor and Propeller performance calculator helps you estimate Efficiency, Output Power, Thermal Power, Current, Thrust and RPM. But put an oversize prop on an electric motor and the motor won't stall, it'll just keep on trying to turn the prop. Prop RPM at max speed is predicted. How to choose a propeller. If you are still feeling lost about your propeller sizing, keep these tips in mind: Always check your engine temperature after a dry prop run. Electric Motors, ESCs, and picking a power system. You also need to be fairly familiar with lipo battery packs. A focus on high RPM or a smaller propeller will push you towards a high KV rating, whereas a large propeller or lower target RPM will require more torque … If you don't have this reference, or are working on a glow to electric seen in our hobby although they have been experimented with. A step by step method to choose your motor and propeller that will give a good match for your electric RC plane. Understanding RC propeller size. Roughly speaking, diameter influences the amount of thrust generated but an ever-increasing and non-performance related issue these days, linked to prop diameter, is that of noise. You'll have to ask someone smarter than me where the 1355 comes from, cause I don't have a clue! accepted by most in the hobby that 100 Watts/lb is a darn good "estimate" for the Some adapters also include a spinner for convenience. In fact, when you hear an rc airplane flying it's more than likely the propeller that you're hearing more than the engine. There are countless stories of model pilots losing fingers, or suffering horrendous lacerations to skin on their hands and arms. Nailing down which RC motor to use is only one piece of the puzzle. I personally recommend going with an RTF for your first electric airplane as it gives you hands on experience with the various components of an electric power system. RC powered gliders are equipped with a folding propeller to reduce drag when the motor is not in use. Motor. All the different brands, As with everything, trial and error - and forums! Incidentally a single blade prop has to 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! Hobbico's Nexstar is pictured above is an, If you're completely new to the hobby, now's a good time to get familiar with the, It is also a good idea to have a basic understanding of the difference of. Too small a propeller on an EP motor won't do any damage, but you won't get the required performance for your plane. As with IC, electric motor manufacturers give a specific propeller size range for their motors but it's more critical that the range must be adhered to. Electric Propellers | Propellers -Gator RC Due to the COVID-19 pandemic, USPS … recommending a specific motor. This is the amount of current it takes to spin the RC electric motor with no prop. As already mentioned, following the propeller size recommendations made by your engine manufacturer should always be your first point of reference. Propeller size are the output of a good harmony among Airplane weight, Engine size, Type of plane we fly. The opposite is true with inrunners. power required for an average sports/aerobatic RC airplane. Awesome, let's get onto the basic fundamentals and thought process of choosing an RC electric motor for a specific airplane. However, there are electric motors on the market for RC planes of all sizes, so you are no longer limited to park flyers. conversion, then you'll need to estimate how much power you will need. Drawing too much current will destroy the motor. > RC Electric Motors, By Matt Brown, Copyright © 2007-2021 Hooked-on-RC-Airplanes.com, If you're looking to get into electric sizes, and specifications can make choosing a motor quite intimidating if you're the length of prop from tip to tip. Alternatively a gearbox could be used and a 3:1 is to be used for this exercise. Many of HobbyKing's planes of that size run on 6X4 props and they have good wind penetration. 750 watts = 1 horsepower. A Watt Meter is essential if you're going to. For example, the 200Kv motor will run at 2400 RPM's regardless of whether it has a 10x6 prop or a 11x5 prop. But 100 watts/lb is a good starting point if you going at tons of nice and affordable. We hear a lot about electric rc aircraft these days, and there’s good reason for it. effect depends on the motor and propeller used as much as it depends on the battery. is known for their high quality ready to fly models. For a large range of light beech wood props visitTOP FLITE'S web page.The major problem with the wood propellors is that they tend to be fairly fragile. 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. The prop noise category is provided. If you're looking to get into electric Folding propellers. fundamentals and thought process of choosing an RC electric motor for a specific airplane. It's no secret that matching a prop to an IC engine is fairly easy if you follow the general size recommendations outlined in the above chart, which have long been accepted in the hobby. Adding more blades decreases the overall efficiency of the prop because each blade has to cut through more turbulent air from the preceding blade. The following propeller size chart (© Top Flight, reproduced with permission) is easy to use; select your IC engine displacement along the bottom scale, then follow the vertical line up to the shaded area to give the prop size range for that engine. tons of nice and affordable ready to fly electric airplanes on the market. 1. the weight of the RC plane because if you have not decided the weight of the plane it will be very difficult to choose motor specifications. The blades of the prop are hinged at the root, and when the motor is running the blades are in their normal forward position, thus pulling the glider through the air. For all motors, Kt= 1355/Kv. Keep safe! In the worst case scenario, the wrong prop can cause serious damage to components and this is especially true for electric powered rc airplanes. How RC Props Work. every single complete turn of the prop). Choosing a propeller is rarely, if ever, a cut-and-dry matter. The motor will draw less current and the plane will likely be seriously under-powered. For example, if your motor is pulling 25Amps, and the Io is 2Amps, then you really only have 23Amps turning the prop. The world of RC boating is a diverse one, especially when it comes to boat types, sizes, and shapes. Follow the links below for more insight into this endeavor. The larger the propeller's diameter and pitch, the more current the RC electric motor will draw for a given RPM. Over-propping can do irreversible damage to electric motors and ESCs, because an incorrect propeller will force the motor to work harder than it was designed to. Choice B: Select Battery first and choose engine and Propeller in like manner. Although this chart is related to Top Flight's Power Point range of props, the size ranges suit all brands. Keep hands and fingers well clear and never become complacent. EP prop selection is much more critical because different combinations of motors, ESCs and battery packs can generate huge differences in operating speeds and loads. If you plan to fly high alpha 3D maneuvers you'll want to bump that up to In a nut shell, this means the faster the motor spins for a given voltage (Kv), the lower the output torque will be (Kt). All rc propellers are designated two measurements, both usually given in inches. The maximum current and power is what determines how large of a prop and what size plane can be used with the motor. 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. … There are many factors which you need to consider in deciding the motors for RC planes. Propeller, Motor and LIPO battery will work productively when its blend is "right". This is just ONE way to do it! A larger diameter prop reduces the engine's RPM at any given power setting, because there is more for the engine to turn over and hence more work to do. On the other hand they are the least expensi… #4 How to Balance RC Plane Propellers. 8045 means a propeller with 8 inch diameter & 4.5 inch pitch. In this environmentally-sensitive world that we live, this is a serious consideration to take in to account when selecting a propeller, especially if your flying site is 'noise sensitive' (eg close to houses etc.). And slower turning props generate less noise - therefore, larger diameter props run quieter than smaller diameter props, all else being equal. 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. Most motors come with mounts specially built for … Rm is the "Terminal Resistance". How to choose the propeller for rc plane . When come up with this question there are also more questions involved in the thread. The manufacturer of the plane might also give a recommended prop size, but it's more common for the recommendation to come with the engine or motor. Home | Site map | Search | Contact | About | Privacy Policy/Cookie info. 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. For example If we want to fly trainer rc plane the weight to power ratio of at least one to one should be fine. So please enjoy your visit, and I wish you many future happy landings! On the first run with the new prop, run it at full speed for twenty to thirty seconds, observe how quickly the boat got on plane and the … Copyright© Pete Carpenter / RCAirplaneWorld.com 2002-2020. Just accept it for what it is. Electric powered aircraft have come a long way in the last several years and flying an electric airplane is an easy way to enjoy the hobby since it’s so much simpler and cleaner than flying glow or gas. recommend the specific brand of RC electric motors that they are affiliated 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. Pete. When come up with this question there are also more questions involved in the thread. 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, but on some models fuselage and ground clearance issues might dictate which propeller size you can and can't have on the model. This is how many RPM's the motor turns for each volt applied. Equally important is choosing the correct size electronic speed control and battery. When choosing a propeller, choose a pitch that will keep the engine RPM in its recommended operating range. brushless motor application guide for rc Electric motor power is stated in watts. You'd be forgiven for just thinking of your rc plane's prop as the thing at the front of the plane that spins round very fast, but understanding a bit about how propellers actually work is no bad thing. Hobbico's Nexstar is pictured above is an excellent electric powered ready-to-fly trainer . Brushless motors have become the mainstay of e-powered, RC airplanes, and there are many reasons why they have become so dominant in the RC industry. Mounting the motor securely ensures that the plane will operate as expected, flying at level and at a consistent speed, without sudden plunges. The first radio controlled airplane propellers were wooden. The majority of propellers used in the radio control flying hobby have two blades but props with three or even four blades are available. Electric RC Airplanes How to choose the propeller for rc plane . However, not everyone knows how they work. As for the KV rating of an aircraft’s motor, the call you have to make is much the same as that for model vehicles. Choose The Right Propeller While all engines produce power the Propeller is essential to transmit this power. Brushless motors use a standard numbering scheme to describe their physical size and kV rating. 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. Actually, it's a tad less because motors aren't 100% efficient. One way to understand propeller pitch is to imagine the gauge of two different screw threads, coarse and fine, and picture both being screwed into a piece of wood at the same rotational speed.

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