Example 2:
ing how you want the servos to move over time. What we want them to do for this ex- ample is to move the clamshell in position and once in position, ramp up the throttle. When the switch is toggled back to position 0, I want the throttle to return to zero and have the clamshells return to their starting position. So knowing the bottom of each box is –100% and top +100% we can start creat- ing our graph. If you somehow get the switch operations backwards, you can go back to the first screen and swap the For- ward and Reverse checkboxes to correct it. If servos end up moving in the wrong direc- tion, that can be fixed on the Servo Reverse screen.
Final steps to creating a sequencer (Second Screen) • Toggle the assigned switch (Switch H) to position 1. • For this sequencer we want both chan- nels to start at –100% position and stay there for a while. So we make sure the screen says “Point: 0” then ... • Define the starting positions for both controls. Point: 0 = (Time: 0%) CLM: –100% and CTR: –100% • We don’t want any movement quite yet,
so we kept the same values. Point: 1 = (Time: 25%) CLM: –100% and CTR: –100%. • Next we want the clamshells to start to
open fully, but smoothly (Propo mode). To do that, we set Point 2 = (Time: 50%) CLM: +100% and CTR: –100%. Notice how the graph is a diagonal line—this shows the smooth proportional travel. • We need to adjust the time delay some, so for Point 3 change the time to 60% but keep CLM and CTR at their same positions (CLM: +100% and CTR: –100%). The reason for this change is because soon after the clamshells are in position we want the Throttle Control channel to start moving the throttle up to generate reverse thrust. • To create a steeper (faster) change, we
adjust Point 4 to have Time: 75%. The clamshells should not move, so CLM: +100%. To ramp the throttle up, we need to change CTR: +100% (full throttle). When our editor tries this in his BD-5, he will ad- just the CTR value to match the amount of reverse thrust he desires. We have now created the sequence for ac- tivating the thrust reverser. We still need to enter values for the deactivating thrust re-
FLYING MODELS
versing. For this we will be looking at the time graph in reverse direction. • Toggle switch H to position 0. You can
see the time icon move in the other direc- tion. When it finishes ... • Note that the starting point (right side
of chart) is point 4. Leave the existing set- tings of Time: 100% and CLM: +100% and CTR: +100%. The CLM and CTR values at the two end points are always the same for forward and reverse travel. Think about it— it has to be that way! • The throttle should be cut immediately as soon as the switch is toggled, so we need to adjust the Point 3 data some. By adjust- ing the time to 99%, it will happen immedi- ately. The clamshells shouldn’t move, so we leave them CLM: +100% but the throttle needs to cut, so change it to CTR: –100%. • To give the throttle some response time, the servo settings for Point 2 should remain unchanged, that is, CLM: +100% and CTR: – 100%. The time should be set at 75%. • To move the clamshells to their retract-
ed position, for Point 1 change CLM: -100% and keep the throttle off CTR: –100%. • You should notice that Point 0 = Time: 0% and CLM: –100% and CTR: –100%. This completes the programming of the sequences for both directions of travel. If you flip the switch, you should be able to visual- ize what happens with the servos. Now that we have created the sequencer functions we need to couple the throttle con- trol function to the throttle channel by cre- ating mixes. At this time, you need to pow- er-cycle the radio. This will cause the system to recognize the new switches you created (the sequencer outputs can act as switches too). When the radio is back alive, • From the Function List select any of the available 16 mixes. It is best to use high- numbered mixes for simple actions like this, since we don’t want to waste an “expo-able” mix 1–8. Pick Mix 9 for this example. • For the master channel select the se- quencer channel called CTR (Throttle Control). • The slave channel will be the Throttle channel. • The mixing rates will be Rate: 100% 0%, Offset will be –100% • The switch selection for this mix is go- ing to be the Clamshell function. • Since we want the sequencer to control
the channel once it starts its sequence, we need to select 1,2,3 & 4 as switch positions.
Now with this mix when the sequencer is activated, once the clamshells are in place the sequencer will move the throttle channel to 100% and when we toggle the sequencer off the throttle channel will return to throt- tle stick position. The Second mix is not absolutely needed if you are using electric, but I like to create it anyway just to keep everything working smoothly. We create a Throttle to Throttle mix to disable throttle stick function when the sequencer is in control of the throttle channel, otherwise we would need to manu- ally pull the stick to low throttle when acti- vating braking. • From the function list select any of the available mixes; we’ll use Mix 10. • Select master and slave as THR > THR. • The mixing rate will be Rate: –100% 0%, Offset –100% • The switch selection is Clamshell, and
Pos.1, 2, 3 and 4 will be selected. These switch settings match the ones we put in Mix 9. There you have it! You just made a config- uration using one sequencer and two mixes to automatically control a thrust reverser. Please remember that all the values provid- ed are examples and you may need to use dif- ferent values based on your specific model.
Example 2: Basic Constant Cycler Did you ever want to have a channel that moves back and forth on its own to control a gun turret, wipers or maybe even a pilot’s head just moving around randomly? Well this next sequencer will get the job done. We’ll start with a basic cycling sequencer function and from there we will add to it for the additional features such as being able to turn it on/off and combining two of them to create a random movement effect. To save space, this section will just note the changes to make. A detailed explanation will follow. Select an unused sequencer from the list. We will call it “S#A” or “S#B” and you can insert the right digit in place of the # sign. • Switch: B (we will change it later, it needs to be a 3-position switch) • Forward: position 0 / Speed 10 • Reverse: positions 1 and 2 / Speed 10 • Type A: Propo / Type B: Step • Select NEXT The NEXT screen will display the Time
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