The only downside to reducing the weight of your car is loss of traction. Replacing an old tired battery with new can certainly improve things. If you are using older Ni-Mh or Ni-Cad type batteries, upgrading to the modern Li-Po type can make a huge difference to performance, especially if you are using a decent brushless motor and ESC combination.
Most ready-to-run RTR electric radio controlled cars bought in the shops are fitted with budget brushed or brushless motor systems to keep the price down. This is fine to get you started, but if you really want to push your car to its limits, upgrading your Motor and ESC electronic speed controller to a high performance system is a great way to do it.
By using a high performance brushless motor and ESC you can expect to see some pretty amazing speeds out of your RC car, with the added bonus of improved efficiency and longer run times that brushless technology has to offer. The motor and ESC you choose will depend on how fast you want to go, and the amount of money you want to spend.
When I first upgraded to a brushless system, I was still using Ni-Mh batteries. Even while using the old brushed motor, the car had much more punch and top end. For this reason, Li-Po batteries are highly recommended. Just remember to take care when using, charging and storing them.
I have seen, first hand, a Li-po burst into flames when it was connected to the car the wrong way around. Brushless motors are usually rated by the number of turns 4. For off-road use you would need a slower motor with more torque; the extra amount of effort to move along on rough ground or grass is going to generate more heat and put more strain on the motor.
The leaflet shown below from Castle Creations gives you some examples of the speeds you can expect from their products. Note that the fastest possible combination on this sheet shows a slower Kv or motor with a 3s The or motor would be the faster option if you were limited to 2s Li-pos or standard 6 cell battery packs.
Using a more aerodynamic body shell can help your car achieve a higher top speed. A large, bulky truck or car shell is always going to create more drag, so using a sleek, aerodynamic shell with less wind resistance is what you need if you are hoping to go faster. Hopefully this guide has given you some great ideas on how you can make your RC car go much faster, so have fun experimenting! You must be logged in to post a comment. Close Menu Home. RC Car Tips Nitro.
Are there any drawbacks to brushless motors? The only possible drawback to a brushless motor system is the increased starting cost, however anyone familiar with maintaining high-power, heavily abused brushed motors will know that you'll quickly see considerable savings because you won't be replacing motor brushes, brush springs, armatures or whole motors How much cheaper could brushless motors be than standard motors?
The cost of racing a typical touring car brushed motor could add up to over Euro per run if you replace the brushes every time you do a 5-minute race. Add in the cost of a variety of springs four pairs of springs at 3 Euro per pair , commutator lathe at over 90 Euro, diamond tip for the lathe at over 50 Euro, then the extra battery pack for the lathe and you've got quite a racing bill on your hands!
Are brushless motors really 'no maintenance'? They are such a time-saver that racers around the world have re-discovered the joys of having fun in the pit area. They no longer have to deal with everything they used to do with their motors between every race: motor removal, disassembly, comm trueing, brush swapping, re-assembly, break-in and finally re-installing The only possible need for maintenance are on well-used brushless motors that might need the bearings cleaned or changed.
This is only ever rarely needed, however, so it shouldn't even be classified as regular maintenance work. Why Sensorless? Apart from basic size and power differences, brushless motors are available in two main types: sensored and sensorless. Sensored motors use very small sensors on the rotor, plus an extra set of thin wires that connect the motor to the speedo, in addition to the three thick wires that give the motor its power.
The extra wires tell the speedo the position of the motor's armature as it spins, hundreds of times per second. This provides a huge amount of data to the speedo, and the speedo's 'brain' takes this data and combines it with the throttle input from the radio system to make the motor spin as smoothly and efficiently as possible.
All this makes for a great system for top-level racers, however it makes the speedos and motors a bit more expensive and slightly harder to install and use. A sensorless brushless system, as you might guess, doesn't have these sensors and extra wires, and the motor armature spins without relaying its exact precision back to the speedo every milisecond. This makes the motor and speedo easier to manufacture, simpler to install, easier to adjust and cheaper overall.
A sensorless system provides the same amount of power as a sensored type, just with a tiny bit less precision - perfect for sport racers, general hobbyists and pretty much anyone that isn't a hardcore, world-traveling racer. At HPI, we decided that our customers would almost never need the precision that is available from sensored systems, and we've chosen to use the popular sensorless brushless system for the Flux series.
Rory Slatter 25 October Here at RC Geeks, we're often asked how fast a specific car will go and, unfortunately, we often have to avoid exact answers. However, we've made this convenient little blog to help you understand the variables which will contribute to an RC cars top speed , and hopefully give you some idea how fast your RC car can go.
Brushed vs Brushless The first variable to tackle has to be brushed vs brushless motors. But, Rory, what's the difference? I hear you ask. Well it's the brushes, of course. The general workings of brushed and brushless motors are essentially the same; however, brushed motors use friction to apply charge to the motor, which allows less of the raw power to be converted to actual rotation. So if it's speed you're after, it's got to be brushless. How do I find out if an RC car is brushed or brushless?
Generally, a quick search of the car in question will bring up the manufacturers page - containing every possible detail of the car, right down to the name of the person who painted it. Well, maybe not quite that far, but you get my point. Luckily for you, RC Geeks have sifted through all of the useless information for you already. Simply visit the cars section of our website, or use our search bar to locate the car that you're looking for. Scroll down on its page and expand the "Specification" box , as seen below.
Under "Power", you'll either see "Brushed" or "Brushless" simple, right? We often also include handy information such as scale size and surface type in this section, you're welcome. NiMH batteries typically have a lower efficiency and a lower energy density than LiPo batteries. Although they are generally considered to be safer and easier to maintain - if speed is what you're after - LiPo all the way. Lithium Polymer batteries have a higher discharge rate, and a larger energy density, meaning that they can channel more power at any one time and, therefore, increase the power being supplied to the motors.
This can be useful for the newbies among us, as the slightly more docile NiMH battery can be used initially, during the learning phase, and the LiPo upgraded to at a later stage.
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