How to understand brushless timing Brushless motors have completely taken over racing, and pretty much everyone has switched to brushless. So grab your gears, turn on your calculator, and buckle in, because our first stop will be to look at some jargon and concepts you'll need to know before we really dive in. 318 sold. The chart to the right shows the RPM for each motor with different pinion and spur gear combinations. Free postage. We also need to know what battery we're using. There are two gears that we work with to modify this; the pinion gear and the spur gear. You express the units of torque as the length of the lever times force, with examples being foot-pounds or newton-meters. The force applied at a distance produces a torque that can be used to tighten bolts such as lug nuts found on your car. Less strain and heat on the motor and ESC, More strain and heat on the motor and ESC. When bashing with your buddies, speed is king and I am here to show you how to get the […] Changing the Spur for example from a 74 to a 72 is a small change compared to a pinion change of 28 to 29. Be sure to check out my Simple Guide to Motor Timing, Boost and Turbo, RC Car Nitro Engine Keeps Blowing Glow Plugs, RC Car Racing for Beginners – A Typical Race Meeting, Simple Guide to RC Motor Timing, Boost, and Turbo, How to remove worn tires from rc car rims, When RC Battery connectors melt or overheat, Simple Guide to Motor Timing, Boost and Turbo. There are a few common sizes we use in R/C, such as 32-pitch (32P), 48-pitch (48P), and 64-pitch (64P). We have to keep in mind the pinion and spur gears usually aren't the only gears in the vehicle. When we start discussing motors, we'll be referring to the Kv of the motor, which is a short way of referencing the motor's RPM per volt applied to the motor (when spinning without a load). As you can see from Figure 3-2, by reducing the output shaft speed from the input shaft by 1/2, the output torque increases by a factor of 2. One gear doesn't really do you any good by itself, and if two gears have the exact same circumference, they don't help out much, either, so for our purposes, gearing will refer to a collection of gears of varying sizes working together toward a common goal. Gearing up refers to decreasing the gear ratio, and gearing down increases it. … The lower KV ratings will have powerful torque but lower top speeds. The best way to gain torque and keep wheelspeed is go with a 4 pole motor around 3500kv on 3S then gear down to the desired top end speed. Also shown is a desired speed+torque operating point for the motor+gearbox combination, showing that only … Copyright © 2009-2020, Roger's Hobby Center. Without it possing a risk! The 2.2 monster truck wheels are molded from high-quality nylon and … I later learned about proper gearing, gear mesh and exactly what happens to your RC when your gearing changes. However, be careful not to go too undergeared as this can also cause overheating. Because from looking at 3:1 ratio we can easily tell that it means that the revolution’s speed is reduced three times, which means … 4WD cars put more strain on the motor and therefore must be geared higher. Sometimes there is a transmission, like our Traxxas Slash VXL has. The torque/speed curves shown below are actual curves for the green maxon motor (pictured at right) used by students in 2.007. Gears are useful for multiplying or dividing torque, whether the gears mesh directly or through a belt or chain; the ratio of the size of the gears determines whether they increase or decrease torque. would the motor get too overworked, as gearing it for speed would require more torque from the motor? The gear turns with 600 newton-meters of torque. Page 3-Discussion Going for 6S in Kyosho Inferno GT2 1/8 On-road Cars UK Seller. Therefore, a higher turn motor will need a larger pinion / smaller spur gear combination to make use of all this low end torque. First the stock numbers for a base line. If you wanted to get more speed for this truck, you could either 1) increase the pinion gear's tooth count or 2) lower the spur gear's tooth count. You may change one or both gears to achieve the desired effect. On brushless motors RPMs are given by kV. Overview: 4Pcs MG996R Metal Gear Torque Digital Servo MG995 For JR RC Car Airplane The MG996R is an upgraded version of the famous T-Pro MG995 series. Differences between theoretical and actual performance. Now, we’ve shifted gears and moved onto nitro power. Many factors have been taken into consideration to make this calculator as accurate as possible, but certain variables like vehicle weight, battery quality, drivetrain drag, etc can have an effect on the actual speed. Keep in mind this is all theoretical. For every 10 turns of the input shaft, the output shaft turns once. A slower motor with higher gearing is going to produce less torque while running hotter. Please click "See More" for links and more informationOne of the most common questions we hear about RC cars and trucks is, "how fast does it go?" This is generally true as long as the curve represents the direct output … Its internal gearing and motor are also upgraded to improve dead bandwidth and centering. Pinion gears usually have the number etched on them too, but some manufacturers omit this. We're sorry, But AliExpress doesn't work properly without JavaScript enabled. kv is how fast the motor will spin at 1 volt with no load. Gearing reduces the shaft rpm of an electric power system (it can be used to increase rpm too, but I know of no cases where this has been done for an electric aircraft). This updated version uses high-grade aluminum and is the second generation of model 3650 21.5T. We literally have thousands of great products in all product categories. Lower turn motors such as 5.5t or 8.5t will generally need to use a small pinion, large spur combination. I wanna do willies and flips and jumps at least try. This tends to be the most difficult aspect of gearing for people to keep straight, and I find it helps to think of it in a relative fashion. Your car will accelerate off the mark very quickly, but the top speed it reaches won’t be as high. Slash VXL Stock Gearing23-tooth pinion & 86-tooth spur. By increasing or decreasing the amount of teeth on one of the gears, this affects how many times the pinion gear needs to rotate to turn the spur gear one full rotation (hence why it is called the gear ratio). The nice thing about the Sidewinder 8th is the heavier-duty electronics and larger motor and both handle more heat, and dissipate the heat faster, meaning you can increase your RPM and not worry as much about overheating. Only 1 left. It assumes the motor is under no load — that is there’s no gearing, no resistance, no vehicle being propelled forward. Wheel torque can be calculated function of engine torque if the parameters and status of the transmission are known. This gets a little more complicated, because you're likely to also switch batteries as well, since the Sidewinder 8th opens you up to using higher voltage packs, which will in turn affect the calculations and final RPM. As the motor spins, it rotates a series of gears that ultimately drives your vehicle forward. Example: If your max Torque is at 3300 RPM use 3300 for the RPM. Its internal gearing and motor are also upgraded to improve dead bandwith and centering. Weight- 55g Dimension 40.7*19.7*42.9mm Stall torque 10kg/cm Upgrade MN Model MN-45 D96 D90 D99 Metal Gear Rear Axle & Brace. Gearing for cruising To find the ideal gear ratio for cruising use your RPM at peak Torque. Gearing can be altered by changing the pinion or spur gear. If you look at the gearing for the higher speeds, you notice that the spur,pinion, and voltage increase! The closer the pinion & spur are in tooth count, the higher the speed. Now that we have the equation, we just have to pop our numbers in and determine the outcome. Smooth driving will help you get those consistent lap times, so experiment to get gearing just right for the kind of area or track you want to race on. Let’s say you want to increase the speed or torque of the vehicle; this can be done by simply changing the gearing. The most common gears you can change on an R/C vehicle are the pinion gear, which is the gear directly connected to the motor's output shaft, and the spur gear, which is the main drive gear in a vehicle, and usually interfaces with the pinion gear (a pinion can also be a gear associated with a differential assembly, so make sure to use context to deduce which is being referred to). For the purposes of this article, we'll use a Traxxas Slash VXL 2WD truck, though the concepts we're discussing can be used on almost any vehicle. On low grip tracks, or wet/icy conditions, a high gear will give you more traction out of the corners, so this setup is worth trying even on small, technical layouts. As long as you are paying attention to the temperatures of your motor and speed control, there isn't a wrong gearing. The higher the FDR, the more low-end torque you get. Decrease gearing (higher FDR) = less bottom end, less top end, faster acceleration Now the thing I should probably note here is how I consider top end, bottom end and torque separately. Finally, gearboxes usually come with specifications on the maximum speed allowable at the input shaft and the maximum torque allowable at the output shaft. Let's calculate the gearing based on using a 4S LiPo, with a voltage of 16.8 volts when fully charged, and staying with the 2S LiPo for the stock Velineon motor. One of the more common aftermarket changes a consumer can make is switching out an electric truck's motor. 2020's new deals! A gear is a type of machine. With a low gear, you’ll benefit from longer run times and cooler running temperatures on the ESC and motor. went back to my drift tires and brought the gearing to 85/33 which is how it is currently (with new set of rubber tires) So is it the ratio or the gear size that is more important? January 8, 2020, Gavin, Leave a comment. Topic: Necessary Torque for RC Rover (Read 900 times) previous topic - next topic. The gear ratio is 24:8, which is equal to 3:1. Hell this is a MT. These are often made from plastic and sometimes composites or even Kevlar. Higher end ESC’s allow you to program some throttle softening or punch reduction in. So if you wanted to get more torque and less top speed out of our example Slash VXL, you could either up the spur gear to the 90-tooth option Traxxas offers, or lower your pinion gear down to, say, a 20-tooth gear or any other tooth count lower than 23. 60228 - BLITZ ROADSTER 1/10 190mm Touring Car body-shell 0.5mm - PRE ORDER nmac2011. That’s pretty simple. We're sorry, But AliExpress doesn't work properly without JavaScript enabled. Speed isn't always the most important: 40km/hr is fast enough already on a track. For example the Pro4 4600 motor in a TLR SCTE will often be geared in the 13-15T range, compared to a Pro4 4300HD on the same … Imagine that five-speed bicycle you had as a kid. And don't miss out on limited deals on Rc Gearing for Torque! Consideration of machine efficiency. Its internal gearing and motor are also upgraded to improve dead bandwidth and centering. Your RC Car manual should give recommendations on gear ratios. Touring Car drivers warning! Most racers are hitting tracks with sensored 17.5 brushless setups, but unlike their brushed 27-turn “stock” predecessors, these motors allow you to change the motor’s timing. But the torque at the wheels will change depending on gearing. It will save you a lot of time and money on repairs. Traxxas Servo High-Torque for T-Maxx and E-Maxx, 2055. Thinking about it this way, it doesn't matter which gear you change - it's applicable to any vehicle, any gear pitch, and any tooth count. This will reduce your run times per battery charge when compared to a low gear. If you put a faster motor in your rig and don’t change the gearing to match, you could overheat your motor and/or ESC, resulting in a failure. Dec 06, 2015, 11:45 pm . We have to work out the math to determine our RPMs going into the transmission. For drifting, usually a setting between 7.25 and 8.5 is good since you want that torque to pull you out of a turn. Input gear where torque is applied is known as driver. Add to cart. Gear ratio refers to the ratio of output torque to the ratio of input torque. However, if you wanted to upgrade to a larger battery and larger motor, you're likely to have wanted some more speed and/or performance as a result. To calculate gear ratios and the effect they have on torque, you … rc gearing for torque berkualitas dengan pengiriman gratis global di AliExpress In other words, if you get the final drive gearing right to go with available engine torque, it will make very little difference in acceleration up to 28 mph. How gearing will affect the motor’s output torque and speed. Under gearing a 4 pole motor can and often will create more heat and mah usage than one that is over geared. OK, so given all of that, now you add the pinion gear into the mix. However, you cannot calculate a … For off-road sports, racing focused RC vehicles you will see no other good option then this HobbyWing’s top-notch sensored high-torque brushless RC motor. The higher the pitch, the smaller the teeth. With any RC, make sure the company offers spare parts because parts will wear out, you will crash and things will break. We also need to know that, to figure out what the initial RPM without any gearing is, we need to multiply the Kv of the motor by the voltage of the battery. However I am having difficulty calculating the torque. you also can calculate that max rpm's with 11.1v is 38500, which is well under the max. Free postage. RC Car: Gearing Up and Wheeling Out. $15.99 $ 15. It all depends on the vehicle. Let's say we want to change our stock Traxxas Velineon motor out to something with a little more top end, like a Castle Sidewinder 4 with a 5700Kv motor. If we wanted to increase our speed, but not as much, we'd also have to adjust our gearing. Gear ratios are important as they allow us to better control speed and torque. Therefore, a higher turn motor will need a larger pinion / smaller spur gear combination to make use of all this low end torque. kV means RPM per volt. The first upgrade I would do for any RC is to make a DIY bumper. In theory, a small, winding track with many curves or tight corners will be suited to a low gear, while a high gear will be better for a large, open track with long straights. Cars 2. Tamiya use a proprietory gear pitch they call "0.04". The torque the motor produces does not change, I know that much. Installing an additional fan directed at the motor and cutting some ventilation holes in the body shell should help. First, it's notable that with just a change in gearing, you could gain almost as much speed with the stock motor as you could by changing to a new motor. Gearing and Torque question. Cars 2; Cars 3; Cars 4; Planes; Boats; Post your own setups! Here is a down-and-dirty way of picking the best gearing for a particular car from three choices: 3.07:1 final drive with a wide-ratio transmission, a 3.07:1 final drive with a close-ratio transmission, and a 3.36:1 final drive with a close-ratio transmission. This is the Replacment High Torque Servo for the Traxxas T-Maxx and E-Maxx or any other vehicle that you would like to mount this in. To find mph in gears, use this formula: … Why? This can make the car much easier to drive resulting in smoother driving and quicker lap times. Gearing too high should be avoided, or measures taken to ensure the motor and ESC do not get too hot. The car will be easier to control at top speed, but the high torque and instant power may make the car feel aggressive; especially around the infield of the track when you are on and off the power a lot. This post is about gears and wheels and what we need to know about them in order to run our RC car. If you use a 7.2V battery, a 5000kV motor would spin 36,000 RPM (7.2x5000). Figure 3-2 Diagram of gear’s torque transmission calculation. If you find your car seems to lack power, you may be over or under geared. Only 8 left in stock. A machine is any device that helps you do work. More torque means the motor … FREE Shipping on orders over $25 shipped by Amazon. You would gear your vehicle one way if you want a lot of low-end power, like for a rock crawler, and another way for a super-fast speed run with a sports car. Please note that it is a common practice to calculate ratios in such a manner that they end with 1. The drift tires slip very quickly and therefore there is not much … And now the new motor with stock gearing: That increased the RPM by 4,942 overall; a sizable increase, but as I said above, the increase could lead to an overheating problem. Planes . If you take a look at the traxxas website, for the rustler vxl, theres a chart for gearing. However, the softer acceleration from a high gear may be easier to drive in some situations; a low-geared car on a high grip track may be difficult to control for beginners. The spur gear is the larger gear that the pinion turns. If we just swap motors, we'll certainly gain a lot of speed, but we also might have an issue with overheating due to the reduction of low-end torque. £5.49. So what do you experienced guys say for a starting gear(s) and motor kV. all rc cars i see are geared for torque, even the connection from driveshaft to differentials, why is this? When we take a Torque Wrench and apply an appropriate amount of force on the handle of the wrench we create a torque at the socket. 32P Hardened Steel Upgrade Pinion Gear … If, for instance, a force of 4,000 newtons acts on the gear, and it measures 0.15 meters in radius, 4,000 x 0.15 = 600. Click & Collect. This makes sense; you're nearly halving the Kv, but doubling the voltage — one basically cancels out the other. RC Model White Grease For Plastic Gear Lubrication Drone, Helicopter, Car, Tank. Despite being able to select any gear ratio you like, you should still take into consideration the motor being used. Be advised that gearing your vehicle for speed makes the engine work harder and heat up faster. Torque is best defined or explained by looking at static torque. The only problem is that motor timing is still […] With a 10% change in gearing your 6000 rpm 1-2 shift point changes from 28 mph to 31 mph, … By now you already know that, whatever you are looking for, you’re sure to find it on AliExpress. You can also see 48P written on the Spur gear – P (or DP) indicates the pitch, or size, of each tooth on the gear. What is a pinion gear? MG996R Metal Gears Digital RC Servo Motor High Torque, Black quantity. Add your choice of body, wheels, tires and electronics and unleash your inner beast! The torque multiplication can be calculated directly based off of the gear ratio. The pinion gear is attached to the motor’s output shaft while the spur gear is attached to an output shaft on the transmission. You can alter your car’s gear ratio by using a different pinion or spur gear. Second, the more appropriate gearing for the Castle 5700Kv of 16T/90T is practically identical to simply increasing the pinion gear a single tooth for the Traxxas motor. 4 pole motors make gobs of torque and wasting that torque on an under geared car will mean you’re revving the motor past its optimal use range. We are able to sacrifice speed in order to benefit from increased torque. I don't want to go 50 mph. Finding the right gearing can be a lot or trial and error, but there are many advantages to having a proper gear setup. This extra strain on the motor will cause hotter running temperatures and higher currents flowing. Whereas output gear is known as driven gear. The reason we use gearing in vehicles (both in real life and in R/C) is because of the inverse relationship torque has with how quickly something is spinning. Let's look at an example using our Slash VXL. 4.5 out of 5 stars 45. The figure below shows a speed-torque curve of a motor, and for the same motor with gearboxes of G = 2 and G = 4. There are a few key takeaways here. A higher turn motor (13.5t, 17.5t etc) will have more torque but less top speed or RPM. Gearing for the strip To find the ideal gear ratio for drag racing use your RPM at peak HP. You can see by the F104 Pro gearing chart above that the lowest FDR that the stock gearing will allow is 3.2:1. So because the only modifications we can do to the gearing of the vehicles usually concerns only the pinion and spur gears, that's what we're focusing on. The gear ratio is simply the number of teeth of one gear divided by the number of teeth of a mating gear. This works out to be very little difference between the two. There is also a metric variant on pitch, the module, and the common sizes there are 1Mod, 0.8Mod, and 0.6Mod. Example: If your max HP is at 6300 RPM use 6300 for the RPM. thanks. Great news!! And that's where my understanding ends. Description Additional information Reviews (3) … It's worth knowing 32-pitch and 0.8Mod are the same thing, and can be used interchangeably. Note that the characteristic torque/speed curve for this motor is quite linear. If you drop the 2200Kv Castle Sidewinder 8th in your Slash 4x4, use stock gearing, and upgrade to a 4S LiPo, the performance will be almost the same as a stock truck with a 2S LiPo. Whether you use your RC car for street bashing or competitive racing, knowing the basics of Motor Timing, Boost and Turbo on a modern brushless Motor system is essential if you want to get the best performance out of your model car.. How altering Motor Timing affects performance. Gear reduction reduces speed and increases torque. Genuine EMAX ES08MA II 12g Mini Metal Gear Analog Servo for RC Model - SG90. Multiply the force acting on the first gear by the first gear's radius. Conversely, if you wanted to gain more power, you could 1) decrease the pinion gear's tooth count or 2) increase the spur gear's tooth count. High gear ratios (lower numerical rear axle ratios) provide more torque and acceleration, meaning a vehicle’s engine has to run much faster to achieve a given top speed; hence, increased fuel economy. Change both for maximum effect or fine adjustments. One tip, if you calculate the torque needed to climb a 1 in 10 incline then you're probably going to have enough torque to overcome friction too unless your mechanical system is very high friction. As shown in the previous chapter, you can calculate a gear’s number of rotations by the number of teeth. A differential is a collection of gears designed to allow two tires on the same axle to spin at different rates — check out this amazing video from the 1930's for more information on how differentials work; I've never seen a better informational video. But let's say you had a Slash 4x4 and wanted to upgrade to a Castle Sidewinder 8th motor and speed control. In terms of the speed-torque curve above, a gearbox has the effect of reducing the maximum speed and increasing the maximum torque. Trademarks, logos, and images are property of their respective owners.Use of this site constitutes acceptance of our Terms of Use and Privacy Policy. Post your own setups! As an example, we will use a gear ratio of 10:1. I get about 500 oz-in or about 3.5Nm, I am wonder if that is a … £13.99. Free postage. MG996R Metal Gears Digital RC Servo Motor High Torque, Black ₹ 549.00 ₹ 390.00 inc. taxes. This is due to torque multiplication and speed reduction through the gearbox. The MG996R servo is far more … The best place to start is always the manufacturer's stock , or default, gearing set up. Based on the results from the gearing chart, there's no good reason to upgrade motors if speed is the only consideration, as you can mostly get away with just changing the gearing on a stock Slash VXL and achieve largely the same results. To determine your gear ratio, you divide the spur gear tooth count by the pinion gear tooth count: A Guide to Traxxas' Batteries and Chargers. With less torque, the motor has to work harder while the car is accelerating. The higher turned motors of the same manufacturers and series have more torque, yet lower RPM. Quick, punchy acceleration, lower top speed. For rock crawling, it … Thin motor wires and cheap battery connectors can get very hot and melt if too much electrical current flows through them. Yahboom 20KG Digital Servo Full Metal Gear High Torque Servo Motor for RC Model DIY Waterproof Control Angle 180° DS3218MG. Post up your radio control gearing setups or view the rc gearing chart! RC Cars: Tekno D8T conversion truggy,Hpi vorza buggy; Share; Posted February 1. should be fine Magico just keep an eye on temps i ran a few different motors back in the day on stock gearing like the sport tuned (nice torque for drifting) a vemon fireball 15x3 turn ( rubbish lol ) and a check piont money 17turn ( great motor hard to find now tho ) i ended up fitting a no limit esc and … We usually don't worry about the gearing of the transmissions and/or differentials, because they usually can't be changed — it's rare a company will offer multiple differential gears or transmission gears. This gives you plenty of speed, but still keeps the temps down overall. As you went through the gears, you were able to go faster and faster with minimal additional effort, reaching top speed when you shifted into fifth gear. The pinion gear is the very small gear that fits onto the motor, and is usually made from some kind of metal. Many racers will have lower FDR than shown above but the above is a good starting point. RC Dragsters are designed to do exactly what they sound like. It has a completely new redesigned PCB and IC control system to provide more accuracy. Brushless RC Motors We carry a wide assortment of brushless motors for RC aircraft including both outrunner and innrunner models in all sizes and power ranges. Usually, gears will be used to decrease speed and increase torque. And lower gearing gives you more torque and less top end speed and less stress on the engine. The tooth count is how many teeth are on the gear, and the pitch of the gear refers to the number of teeth per inch of the gear's diameter. Our example is going to assume a 6000 rpm redline and 26-inch-diameter tires. Please click "See More" for links and more informationOne of the most common questions we hear about RC cars and trucks is, "how fast does it go?" Without doing the math on the gearing, someone might spend lots more money than they had to just to gain some speed. Understanding Gearing By AR on Apr 24, 2017. Strong 32-pitch gearing enhances performance in high-torque applications. Ages: 15 years and up . A lower FDR gives your more high end RPMS (some guys relate this to more horsepower and top speed). 4. Aside from the fact most R/C vehicles don't have the ability to shift gears, the concept is the same. For example, if we say the brushless motor can deliver 0.05 ft-lbs of torque at the input shaft, we … A higher turn motor (13.5t, 17.5t etc) will have more torque but less top speed or RPM. We can use this exact number and multiply it by the amount of torque the motor produces. Rather, if you can multiply and divide, and are familiar with how ratios work, you're fully equipped to handle the task. Depending on your motor/ESC combo, your torque will decrease the higher you go in teeth count. There are some that believe 48-pitch and 0.6Mod are also identical, but that is incorrect — while they may be very similar, over time you will notice some wearing on the teeth where they don't fit together exactly right. Other times, there isn't a transmission per se, but maybe a couple of differentials and even a center differential as well. Inefficiency in power transmission – each stage of gearing or chain run is approximately 90% efficient. We recently showed you how to get the most speed out of your electric vehicle with our “7 Ways to go Faster (Electric Edition)” Online Exclusive article. !You’re in the right place for rc gearing for torque. Of two systems using the same type of gearing, the one with the smaller gear ratio is usually more backdrivable. Gear ratio refers to the ratio of output torque to the ratio of input torque. Click & Collect. - if you have found your way to this page from another site and you drive a 4WD touring car then add 1.0 to the above gear ratios eg; Silver Can Brushed becomes 3.7+1.0=4.7:1. I taught myself lots of these concepts over the course of a week. You can gear for a higher top speed at the expense of slower acceleration, or vice versa. Shop our best value Rc Gearing for Torque on AliExpress. Internal: Spur: Pinion: Enter the FDR you looking for ==> Please enter Spur, Pinion and Internal gear ratio. The motor torque will be multiplied by the same amount the motor rpm is decreased between the motor and the wheels. torque and far less angular velocity - something like 10 to 50 fold reduction gearing is normally used. This is because less strain is being put on the motor. Les meilleures offres pour 4PCS MG996R MG995 Metal Gear Digital Torque Servo For Futaba JR RC Truck Racing sont sur eBay Comparez les prix et les spécificités des produits neufs et d'occasion Pleins d'articles en livraison gratuite! SKU: RB786510 Category: Motors. One is a plot of empirical data, and the other was plotted mechanically using a device developed at MIT. Power is torque times rpm, and neglecting mechanical losses in the gearbox, the output power of a geared system will be the same as a direct drive system. Going fast in a straight is easy; the corners are where a race … Step 1. Experience the thrill of arena monster truck action wherever you bash with the Axial® SMT10™ Monster Truck RAW Builder’s Kit. However, changing a motor will sometimes also require you to change your gearing as well. Your RC Car manual should give recommendations on gear ratios. This is gearing in action, providing you with a mechanical advantage, whether you wanted to use as little effort as possible to get going, or wanted to get the fastest possible speed. Whether you want more speed, or more bottom end, the motor is another point of change when we're talking about RPM.
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