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Split elevator roll mix for DX18
Posted by 7oneWo1f |
11-02-2013 @ 11:56 AM | 15,063 Views
If you think like I do, testing mixes in the air before building muscle memory is risky when using a model that cost real money and time to assemble.
Consequently, I like to test unusual mixes in a flight simulator, where in flight mistakes are cheap. This way I am more accustomed to enabling and disabling the mixes at the proper time. I figure this reduces the probability of dumb thumbing a new model.
Here, I will describe one way to setup a mix on a DX18 for a split elevator roll mix, that you can test in Phoenix Flight simulator. It makes for some wicked fast rolls and blenders.
With the help of AndyKunz (Spektrum/RCG) and freechip (RCG), I was able to figure it out, after I wasn’t reading the manual carefully enough.
On the DX18:
Now that you’ve setup the DX18 per above, you will need to setup your radio in Phoenix flight simulator.
With the mix off on the DX18, and the radio switch off, but the cable plugged into the DX18, start up phoenix flight simulator.
Setting up Phoenix Flight simulator for dual aileron dual elevator.
You’re good to go.
Go fly the Beast 100CC in Phoenix and watch how fast your rolls are with this new roll elevator mix.
There are other ways to accomplish this, e.g., especially with regard to reversing and reassigning channels, but if you follow this step by step you should be good to go.
The critical point in setting up a split elevator roll mix is succinctly described in the manual, but I found that it requires more thinking than I am accustomed to while reading manuals, and I was doing it wrong by starting with the AIL>REL mix.
The reason for the channel reassign in step 6 is that Phoenix flight simulator doesn’t seem to be able to see the AUX4 channel, but it can see the AUX2 channel (Phoneix enumerates the DX18's AUX2 channel as "Channel 7"). If your flight simulator (or receiver) has an AUX4, there is no need to reassign the left elevator (LEL) in step 6.
Note also, when setting up a mix to a split dual elevator, do it before you reassign the left elevator channel. If you reassign the left elevator to AUX2 before programming the mix, it won't work. If you setup your mix wrong, restore AUX2 back to Aux2 and Aux 4 back to "L Eleavator" before editing the mix.
Regarding step 5, if you program an aileron stick to to right elevator mix, AIL>REL, you will get a pitch response on the elevators. On the other hand, it does an aileron stick to roll response on the split elevators if you did a AIL>LEL mix, as we did above.
This is clever firmware on Andy’s (or his tem’s) part in that it reduces the number of mixes necessary. However, I found it a bit confusing just reading the manual.
To recap: An AIL>REL mix will give you a pitch response on the split elevators, but AIL>LEL will give you a roll response on the split elevators.
Similarly, if you do an ELE>RAL mix you will get a roll response on the ailerons with an elevator input, but if you do an ELE>LAL mix you will get a pitch response on the ailerons with elevator input.
By the way, this ELE>LAL mix at -100/-100 makes for some wicked high speed no altitude gain walls--but make sure your airframe can handle it.
Consequently, I like to test unusual mixes in a flight simulator, where in flight mistakes are cheap. This way I am more accustomed to enabling and disabling the mixes at the proper time. I figure this reduces the probability of dumb thumbing a new model.
Here, I will describe one way to setup a mix on a DX18 for a split elevator roll mix, that you can test in Phoenix Flight simulator. It makes for some wicked fast rolls and blenders.
With the help of AndyKunz (Spektrum/RCG) and freechip (RCG), I was able to figure it out, after I wasn’t reading the manual carefully enough.
On the DX18:
Code:
1. Setup an arco model.
2. Configure it for dual elevators and dual ailerons.
3. Set all your servos to 150%.
a. Servo setup => travel
i. THR 150/150
ii. RAL 150/150
iii. REL 150/150
iv. RUD 150/150
v. LAL 150/150
vi. LEL 150/150
4. Reverse the left elevator servo in the DX18.
a. Travel => Reverse
i. LEL Reversed
5. Add an aileron to split elevator roll mix
a. Mixing
b. P-Mix x 1 => AIL > LEL
c. Rate -100% / -100%
d. Switch F-Mode (or whatever switch you want it on)
6. Assign LEL (left elevator) to AUX 2
a. System setup -> Yes -> Channel Assign
b. Aux2: L Elevator
c. AUX4: You can keep on L Elevator if you want.
Now that you’ve setup the DX18 per above, you will need to setup your radio in Phoenix flight simulator.
With the mix off on the DX18, and the radio switch off, but the cable plugged into the DX18, start up phoenix flight simulator.
Setting up Phoenix Flight simulator for dual aileron dual elevator.
Code:
1. System->your controls->spectrum->Spectrum DX8
2. Select Edit profile. This will start using the DX8 model,
but rename it to Spektrum DX18 in the box labeled "Name of
Profile" to "Spektrum DX18". Select the DETAILED box in
the upper right.
3. Use the slider to slide down to fixed wing.
4. Select channel 7 (DX18's AUX2) for Left elevator.
5. Select Channel 6 (DX18's AUX1) for left aileron.
6. Make sure left elevator and left aileron is not inverted.
7. Select finished.
8. Make sure your mix is off, and calibrate phoenix to your
expanded range.
9. Select system->your transmitter.
10. Select Calibrate.
11. Follow on screen instructions (which may vary depending on
what other switches you’ve programmed.)
Go fly the Beast 100CC in Phoenix and watch how fast your rolls are with this new roll elevator mix.
There are other ways to accomplish this, e.g., especially with regard to reversing and reassigning channels, but if you follow this step by step you should be good to go.
The critical point in setting up a split elevator roll mix is succinctly described in the manual, but I found that it requires more thinking than I am accustomed to while reading manuals, and I was doing it wrong by starting with the AIL>REL mix.
Quote:
|
Back mixing applies a mix to all related servos in a wing or tail type. For example, if you select 2 AIL, 2 FLAP in the aircraft type screen, a mix to one aileron channel affects both aileron servos. The mix response depends on the aileron[, elevator or flap surface] [strike]channel[/strike] included in the mix. [edited by 7oneWo1f] A Back Mix also enables you to use fewer mixes to achieve the desired response, for example, adding roll to a split elevator--Copied and edited from Spektrum DX18 manual[/url] |
Note also, when setting up a mix to a split dual elevator, do it before you reassign the left elevator channel. If you reassign the left elevator to AUX2 before programming the mix, it won't work. If you setup your mix wrong, restore AUX2 back to Aux2 and Aux 4 back to "L Eleavator" before editing the mix.
Regarding step 5, if you program an aileron stick to to right elevator mix, AIL>REL, you will get a pitch response on the elevators. On the other hand, it does an aileron stick to roll response on the split elevators if you did a AIL>LEL mix, as we did above.
This is clever firmware on Andy’s (or his tem’s) part in that it reduces the number of mixes necessary. However, I found it a bit confusing just reading the manual.
To recap: An AIL>REL mix will give you a pitch response on the split elevators, but AIL>LEL will give you a roll response on the split elevators.
Similarly, if you do an ELE>RAL mix you will get a roll response on the ailerons with an elevator input, but if you do an ELE>LAL mix you will get a pitch response on the ailerons with elevator input.
By the way, this ELE>LAL mix at -100/-100 makes for some wicked high speed no altitude gain walls--but make sure your airframe can handle it.
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