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Skywing Edge 540 91': electric is better!

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sandrocacciola@gmail.com:
Here we go again. Let's continue with what concerns the regulator.
Before being used, the ZTW Mantis HV G2 (the factory settings are set for standard use of brushless motors for propeller aircraft) must be "taught" for the throttle stroke from 0 to 100 (min./max.) for optimize the acceleration curve. To do this, simply turn on the radio first and place the accelerator stick in the max position. (100%). Then connect the battery to the ESC and wait about 2 seconds after which the motor will emit two acoustic signals: at this point you will have to return the accelerator stick to the minimum position (0%); the success of the gas stroke detection operation will be confirmed by a new acoustic signal. This calibration procedure is similar to practically all ESCs but is essential for correct modulation of engine power. Finally, I would like to say a few more words about the convenience of the Android app which, with the Bluetooth module, is easy and intuitive and always at hand. The Bluetooth module can be left connected to the regulator even in flight but I am of the opinion that the less electronics you bring on the flight the better, so I remove it.
Finally, an important thing regarding the operation of a 28-pole (or more) engine like the Dualsky GA6000: someone asked me if my engine had jerks or hiccups when going from 0 to 100% throttle: as I have already replied privately, at the moment I have not noticed similar problems but to be sure I inquired directly from Dualsky who kindly replied that these "disturbances" are not engine malfunctions but can occur if you do not use the latest generation regulators that have 32-bit processors. And in fact my ZTW Mantis satisfies precisely these needs and goes very well...

sandrocacciola@gmail.com:
New entry also for servos: Forza Yantrs!
We finish electronics setup of this model with the choice of servos to install which, given the size and weight of the model, as well as the large moving parts to manage, could only be up to the task. And the opportunity to carry out this test was perfect to "experiment" with a new line of servos with very interesting characteristics but which I didn't know existed until I came across some websites where they spoke very well about it . They are produced by a Chinese company (and this is obvious...) "Yantrs" which specializes in the research, design, development and creation of high-end products for RC remote control which has set itself the goal of putting them on the market at a cost that is currently as low as possible. I took a look at the Yantrs servo catalog and realized that, unlike many other companies, the Yantrs servo catalog is essential and designed to meet the needs of an increasingly demanding modeling market in terms of quality and price.
What struck me most when I started reading the characteristics of these servos is the particularity of the gears they mount which are not of a traditional shape but machined obliquely (called helical) which, say the Yantrs engineers, have the characteristic of engaging more gradually with smoother operation which helps reduce shock loads (so they should last longer...), more stable torque transmission with less noise and vibration. These types of gears, unknown in servos until recently, are now increasingly found in other brands in the RC world.
From the Yantrs catalog I chose the B0850MGX-E servo with brushless motor, programmable rotation angle, pitch resolution with 14bit processor and high precision thanks to a high resolution magnetic sensor (therefore no potentiometer present in the servo). Programming compatible with SR/SSR/SUR/SFR super fast mode.

sandrocacciola@gmail.com:
Let's move on and sorry for the slowness... The Yantrs B0850MGX-E servo has an aluminum case, weighs 80 grams and has a reduced depth (measures 40x20x38mm); the rotation shaft has 2 classic bearings and is also pleasing to the eye. It can be powered from 6 to 8.4 volts developing a torque of 50kg at 8.4v (0.08s) and 46kg at 7.4v (0.09s), 36kg at 6v (0.12s). The rotation is 180° but adjustable via programmer.
In the application (downloadable online) to program the Yantrs servos you can find all the main values (more or less identical to other servos with similar characteristics) such as power, rotation angle, speed, servo center, dead zone, reverse, fail-safe etc. Furthermore, in the software there is also the possibility of applying different types of servo management modes depending on the Rx: in addition to the standard mode, there are SR, SSR, SFR, SXR, UR modes, each with min. parameters. pre-set PWM max and midle. I'm not very knowledgeable in this matter but I've read that they affect the amplitude of the servo's movement, power and speed.
By reading a little I understood that the SSR mode is the one that more than others manages to increase the responsiveness of the servo with shorter pulses, which theoretically allows you to increase the transmission speed to more than 384 Hz, thus allowing you to transmit the gear position to the servo more frequently, e.g. reduce what is called latency here (the time needed to propagate the change in position of the steering wheel to the change in position of the car's wheels).
However, it appears that there is currently no transmitter on the market that uses a 384Hz frequency…
These servos do not emit hum and thanks to the slow power delay function at start-up they move to the neutral position slowly without jerks. Operation appears smooth and without any hesitation. The equipment is also excellent and includes a very sturdy aluminum square with two slip-proof fixing bolts on the crown. Some doubts about the servo rubbers which are the traditional round ones while I would have preferred the more robust square ones. But it's a detail...

sandrocacciola@gmail.com:
Good evening guys. Forgive me for the long break but I had some problems that prevented me from continuing with the test. I take this opportunity to continue while waiting for the holidays that will inevitably lead me to a further break. But you will see that we will get to the end.
In the meantime, let's conclude with the topic of servo controls that we interrupted some time ago. It seems to me that I have already explained a lot to you but there are a couple of things that I still have to tell you. The first concerns programming: I have already explained to you that the graphical interface of the Yantrs software is truly complete and many parameters can be changed but this, in addition to being a good thing, can also be a problem for those who do not have the necessary skills to understand what is being changed with the software. My advice is that once a new servo is connected, it is best to save the default parameters that are provided in the software: this is because I have noticed that there is no possibility of restoring the factory values after having made the changes and saved them on the servo. Another thing: after having made the changes to the parameters you will first have to apply them (“derived parameter”) and then write on the servo (“writinbg device”) otherwise it seems not to go well…
The last thing that I have already mentioned is the fact that these servos are equipped with a 25mm aluminum bracket that is very nice and in the same color as the servo, but it is a bit short especially for those who want a lot of travel in the aileron and quote surfaces.

sandrocacciola@gmail.com:
Good morning,
today I have some great news that comes to me directly from ZTW, the company from which I purchased the voltage regulator for this test, the ZTW Mantis HV G2 160A Opto that I talked about a few posts earlier. Reading the data of an ideal setting that Dualsky proposes for this motor (GA6000) with a 24x10 propeller (the sdame that I will use) I realized that although the ZTW Esc has the ability to modify some parameters, the accessible ones were not all those that I had to check for the optimization of the regulator and therefore I contacted the ZTW company directly to understand how to do it. To my great surprise I found exceptional availability so much so that the ZTW engineers purchased my same motor to couple it with the regulator that I purchased to maximize performance. Result? They sent me an update of the ZTW Mantis HV G2 160A Opto regulator that contains a specific setting for my motor (and consequently for other similar multi-pole motors) that will allow for maximum performance and reliability of the Dualsky/ZTW combination. I also received the ok to make this update available to all my readers. Fantastic, take advantage of it!
These is link for download file.

https://www.dropbox.com/scl/fi/huuawr71be53l36zbwxgs/Mantis-aggiornamento-GA6000.zip?rlkey=m4jkvflo7czfxw4cn6r84ul26&st=cm350iyw&dl=0

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