How do you make throttle-channel active for the whole flight only if throttle-stick is in it’s lowest position when throttle-cut switch is activated? This is interesting brain-exercise, I saw this on some forum not long ago and it’s been on my mind ever since. Now I tried to search it and did not find it anymore so I thought that maybe it was this way. If it was not, well, this works. With Jeti there’s usually several ways to do things.
We could use a simple AND to make it as “when throttle stick is -100 and throttle-cut is off” but then this would activate during flight every time throttle stick is in it’s lowest position. So, that does not work. We need to get fuzzy!
Fuzzy logic to rescue!
We need to think a bit fuzzy here for a while. What we need is a command like “Disable throttle-cut when throttle-cut switch is off and throttle stick is at it’s lowest position”. What we really need here is fuzzy to keep throttle-cut from jumping on and off during flight every time throttle-stick is in it’s lowest position. Since we are making a throttle-cut and not a simple throttle-off this has difference.
Turned out it is simple, done with only two logical switches!
How to make Throttle Cut with dual safety
First create a logical switch with name “Throttle”, then another with name “ThrottleCu” (for throttle-cut).
Settings for logical switch 1
Control 1 is your throttle stick, make it centralized and proportional:
Control 2 is your physical throttle-cut switch. Make it so it shows as ON when throttle cut is OFF (you’re flying):
Now we can make the rest of the settings to the Logical Switch. We want Control 1 to be active when throttle stick is in it’s lowest position. So make it as “X is less than -97%”. Condition is “Multi” as shown below. Control 2 is as it is.
NOTE: If you use your equipment if hot weather you might have a non-working safety switch! If this is the case you might need to put “X is less..” value to -96% or -95%! This is due changes in component-values in warmer temperatures.
You are done with first logical switch. Now, let’s make the other one.
Settings for logical switch 2
What we need in here is control 1 where we choose the logical switch 1 we just made, again, make it centralized and proportional:
Control 2 in this logical switch is again our physical throttle cut switch, make it exactly the same way as in control 1:
Again, it’s time to tie it all up. Since our logical switch 1 is a MULTI-switch it can be OFF, ZERO or ON. We want to use only the ON, so we make the Control 1 as “X is bigger than zero”. Condition is AND in this logical switch and control 2 is again just control 2, the physical switch.
Testing the function
Make sure your physical throttle-cut switch is on, meaning your throttle is cut. Center your throttle stick. Now your logical switch screen should look like this, both our logical switches are OFF:
Now, activate your physical throttle-cut switch like you were to activate throttle. Keep your throttle stick still in the middle, what you see is this:
As you can see the logical switch 1 is now in ZERO. It’s not yet ON because your throttle stick is not in it’s lowest position. That is also why our logical switch 2 is still OFF meaning your engine is not activated even when your physical throttle-cut is off. We need to lower the throttle stick to it’s lowest position to enable normal function, so, lower throttle stick to it’s lowest position and keep it there:
As you can see, now both logical switches are ON. If you now move your stick up and down to any position the logical switch 1 is either ZERO or ON and the logical switch 2 is kept in ON position, it never goes off until you activate your physical throttle-cut switch. After physical switch is used you need again move the throttle stick to it’s lowest position to enable the logical switch 2. Try it out!
Use in transmitters Throttle Cut
Let’s put this added safety to good use. You could activate a hold flight mode with this if you wanted but using it on actual throttle cut might be better. In that way you can test all your flight modes without having the risk of engine starting to run in mistake. (Always, always test your setup for these anyway!).
So head on to “Menu” -> “Advanced Properties” -> “Other Model Options” and scroll down to throttle cut:
For the throttle-cut switch select the logical switch 2, but reversed:
That’s it, your done!
Safety warning and disclaimer
Always make sure everything works as expected before actually flying your model. This is especially important on everything engine-related. RC-Thoughts or me personally are not in any way responsible for anything you do to yourself, your models or surroundings when using these how-to’s.