What is the difference between coreless and brushless servos?
Coreless motors are manufactured with a rotor attached to a commutator plate. They are lightweight and have very low starting inertia, which provides maximum acceleration with relatively low power consumption.
Brushless motors are comprised of magnets and a spinning armature. They are more efficient than coreless motors, but they have a bit more starting inertia. They generally provide very low power consumption and have a longer lifespan than coreless motors.
Both servo types are very efficient these days, in reality your decision should be based more on personal preference, coreless servos are less expensive and can provide the same if not better performance than brushless servos. Brushless servos on the other hand are more efficient and could potentially last longer, but this comes at the expense of higher cost.
Would a coreless servo work well on a large machine, such as a 700 class heli?
Absolutely! One of the most popular servos manufactured a few years ago was a coreless servo. Bert Kammerer himself flies coreless servos on some of his large 700 and even 800 class helicopters. It would be wrong to assume that because you have a large machine you must get brushless servos.
Do I need to run your servos are high voltage?
Yes you should! Our servos were manufactured for high voltage operation. Even though they will operate well at voltages as low as 5.5V, we recommend running at least 6V with 8V being the ideal voltage of operation.
I plugged my helicopter in and one of my coreless servos didn’t boot up, why?
This situation is common when using some BECs. Basically our servos require stable voltage in order to boot up, some switching BECs power up at low voltage and increase their voltage over a certain time frame. If the servo doesn’t get enough voltage, it simply won’t boot up. The reason why only one servo doesn’t boot up is because it is perhaps the last servo in the power up sequence determined by your flybarless system.
Although annoying, this particular issue is not one to be worried about, simply make sure all your servos are powered up before every flight. If you encouter this issue, simply unplug your battery and plug it back in, once all servos power up you are safe to fly.
You can eliminate this behavior completely by using a faster switching BEC, such as those made by Western Robotics or by using a 2 cell lithium polymer battery.
Can your micro servos operate at 8.4 volts?
Yes they can! We specify a maximum voltage of 7.4 volts on our micro servos simply because their motors being so small, running voltages above 7.4 can shorten their lifespan. However, they can certainly tolerate voltages up to 8.4 without issue.
What is so special about your brushless servos?
Our brushless servos offer incredible centering thanks to their 0.0005 μs (microsecond) step. Most FBL controllers can’t even match this short step as of right now, but rest assured that our brushless servos are ahead of the game for when they do and will provide you with years of high-end performance. Our brushless servos also use a 32 bit processor and are extremely quiet!
Why is centering so important on a helicopter?
Unlike fixed wing, helicopters require an extremely precise servo with good centering; this is because the swash plate should move to its intended position with every single stick movement. Using servos with poor centering on a helicopter will adversely affect its behavior to where any pilot will have a feel of “disconnect”. We have always believed that a helicopter will fly as good as the servos it has installed.
At what frame rate (Hertz) should I set my FBL unit with your servos?
Some flybarless units don’t offer an adjustment for the hertz rate. However, others do. If you have a way to adjust your frame rate, simply set it at 333 Hz for all your BK cyclic and tail servos. Cyclic servos will operate perfectly fine at 200 Hz as well.
At what pulse should I set my FBL unit with your servos?
All BK cyclic servos operate at the standard 1520 microsecond pulse. All our BK tail servos operate at 760 microsecond pulse.
Do you offer a warranty?
Yes! We are proud to offer one of the best warranties on the market!
Coreless Servos: 2 year limited warranty.
Brushless Servos: 3 year limited warranty.
Please note that this warranty does not cover crashes, abuse, and/or other issues arising out of improper use.
I have issues with a servo, how can I request service?
Please click to contact us. Provide us with a full description of your problem! The more information you give us, the easier it will be to help you troubleshoot your issue. We take pride in our excellent customer service, in most cases you will receive an answer to your question or concern within a matter of hours.