If you bought a new remote controller for your FPV drone, and in this specific case I am going to show you as an example the Frsky X10S Express radio, you may have realised that the throttle is not smooth at all, and behave as it works on different “levels”. This happens because your remote controller has a throttle ratchet.
The throttle ratchet is useful to fly helis and fixed wings in some cases, but never useful if you want to fly a quadcopter – You need your input sticks, including the throttle, to be as smooth as possible for an accurate flight as possible. The throttle ratchet should be removed in this case. But how?
How to remove the throttle ratchet from your Frsky X10S Express and other similar radio controllers?
You will have to open up the radio by removing the backside screws and unplugging the battery. Then locate your throttle, and you will notice this having two blades: One blade is for the throttle tension, while the second blade, with a dent in the middle, for throttle ratchet. Lose the blade with the dent until you don’t feel the ratchet anymore, then adjust your throttle tension.
Well, this is the quick answer paragraph, but I strongly recommend you to keep reading for a simple, but in-depth guide on how to remove the throttle ratchet from the Frsky x10s express and/or similar radios. For your and our safety, have a peek at the safety warnings page before you continue.
Also, I’ve managed to make a YouTube video covering all these steps, therefore, this guide is available both in text and video format.
How to remove the throttle ratchet on the Frsky Horus X10/S/Express versions?
As mentioned above, the advantage of having the throttle ratchet in a radio transmitter is mainly related to flying UAV planes and helicopters and can have a huge disadvantage in flying an FPV quad drone, in special in acro mode.
That is why, MOST of the radio controllers should come with the throttle ratchet ‘on’, as those radio controllers are made in mind to be used mainly for fixed wings and helis, but can be easily configured for quads.
Removing the throttle ratchet from a radio transmitter will allow the pilot to perform smoother manoeuvres on the throttle and maintain a stable and accurate altitude when flying.
Removing the throttle ratchet does not mean removing any physical device from the radio, but loosening one simple screw for one of the throttle blades not to act anymore on one of the throttle gear.
A throttle device with a ratchet should have two blades and two gears on the throttle.
How to open up the frsky horus x10s express.
When you turn around your radio, on this model on the backside, there should be 4 screws, one in each corner as shown in the photo above. Unscrew those and open up the battery cover and remove the battery. Be careful when you remove the battery that there is a connector directly on the motherboard.
You can easily remove the connector with either your fingers or a small tool that can push out the connector safely.
After you removed the screws and the battery, on this Frsky x10s express model, you can go and open it up from the edges. Just don’t aggressively pull it out as you don’t want any wiring to be stuck in the back cover.
Locating the throttle ratchet on Frsky Horus x10s express
Before you locate your throttle ratchet, you must first locate the throttle. For a mode 2 radio (standard), the throttle gear is on the left side, therefore, after you flip it, this should obviously be on the right side as seen from the backside.
– one of the gears should be a smooth wheel, and the other a cogwheel.
– one of the blades is smooth all across its surface while the other has a dent in the middle.
– The throttle ratchet is the blade with the dent in the middle which acts on the cogwheel.
Loosening the throttle ratchet screw and adjusting the throttle “strength “
– By lowering the tension on the blade with the dent so it doesn’t act anymore on the cogwheel, will smooth out the throttle in general. However, if you do this, the tension of the throttle is lowered, therefore, you must tighten up a bit the first blade which acts on the smooth wheel.
The first blade is indeed the throttle tension. Don’t overforce it but neither underdo it. Tight up the throttle tension and test your throttle from the radio so this to be not loose at all when you hold the controller vertically (e.g. this doesn’t fall by itself)
Due to a higher tension of the throttle blade acting on the throttle gear to compensate for the missing tension from the ratchet, you may feel that the throttle may be slightly sticky if acted very lightly upon.
What I’ve done by myself (not following anyone‘s guide) is that I applied a micro drop of grease (WD-40) on a screwdriver and then applying on the smooth gear from the throttle in order to smooth it out even more. You should not do this if you may think your throttle acts fine enough for you. This is just an addition in order to smooth out the throttle and you should be careful taking this decision if you need to do this or not.
This is not hard, is not difficult at all to remove the throttle ratchet from the FrSky Horus X10S Express. As for other x10 versions, these should have similar implications of following this guide and should not be different. As for totally different radios, the process may be different but in general, the ratchet and the gear should be the same.
Thank you very much for reading this guide and I hope it’s been helpful. Don’t forget, this guide I share with you for free and ask nothing in return, but I would really appreciate a share or mention if you found this helpful. Have a nice day and stay safe!