Trimming your Aerobatic Model - RC World

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Note the master channel is the first channel listed, and the slave is the second channel listed – both are preset to throttleby the mixing logic. I recommend you start by setting the correct master and slave channels, which in our case themaster is the rudder, and the slave is the elevator. Then, zero out all of the mix ratios at each programmable point (i.e.Point- 0, Point- 1, and so on). When you’re done, the page should look like this.If you choose to switch <strong>your</strong> mixes on and off, now would be a good time to do so. There is a switch select icon on theleft side of the screen for this purpose. I, however, recommend leaving the mix on at all times. There are very fewinstances where this will present even the slightest problem, so the simplicity allowed by eliminating the need for anyadditional switching just makes sense.With the base mix menu set, it is time to adjust the values. In general, most small models require less than 10% mixingin either the pitch or roll sense. I would recommend starting with a small mix of 2-3%, followed by a test flight and furtheradjustments. The final numbers on the Yak were slightly higher than my initial estimate, so after test flying several times,I ended up with a rudder/elevator mix screen that looks like this.Looking at that screen, you’ll notice the two mixes aren’t exactly the same. One direction has slightly more mixpercentage than the other, and this is completely normal. It is rare that models need the same mix with rudder in bothdirections. Also note that the mix is basically linear, i.e. at full deflection, the mix point is 8, then at 2/3 deflection its 5,and at 1/3 deflection it is 3 – basically a straight line on the graph. The beauty of the 9303 is that it allows me to preciselyfine-tune the mix to match my airplane perfectly with its multi-point mix curve.Rudder/Aileron Mixing – JR 9303I generally use the second P-mix for rudder/aileron mixing and use the exact same technique for rudder/aileron mixingas I did for rudder/elevator. Start by activating the mix, setting the master and slave channels, and zeroing the mixvalues. Your screen should look like this.
On the Yak, I ended up with what I would describe as a 5% linear mix.Notice that the mix graph looks slightly different than the rudder/elevator graph. For the rudder/elevator mix, we wereusing up elevator for both directions of rudder deflections. With the rudder/aileron mix we use aileron opposite the rudderdirection, thus the graph of the rudder/aileron mix shows a line that extends above the baseline on the left, and belowthe baseline on the right. This indicates different directions of travel on each side of neutral rudder. Be sure when you’resetting the model up to check the actual direction of the mix by moving the flight controls and visually confirming the mixis moving the slave channel correctly.Rudder/Elevator Mixing - Futaba 9CAPThe Futaba 9CAP uses P-mixes that are similar to the 9303, with a total of seven Prog Mixes (P-mixes). The first fiveare a basic simple linear ratio mix, while mixes 6 and 7 each have a 5-point curve similar to the 9303. The procedure touse the multi-point mix is virtually identical to that used in the 9303 detailed above, so let’s take a look at applying one ofthe basic percentage mixes to compensate for coupling in the Yak.With the transmitter on, enter the Basic/Acro programming mode by holding the Mode/Page button.The Prog Mixes are located on the Advanced/Acro function page, which is reached by pressing the Mode/Page button asecond time.Remember, Prog Mixes 1-5 are a basic percentage mix and lack the ability to fine tune the mix through a multi-point mix.If you anticipate the need for the multi-point mix, I’d recommend using Prog Mixes 6 or 7. In my case, the Yak isperfectly happy with a basic linear mix, so I chose Prog Mix 1 for the rudder/elevator KE mix. Selecting P-mix 1 brings up
Page 2 and 3: Aileron DifferentialIf you think ba
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Trimming your Aerobatic Model - RC World

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