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Lemon Stabiliser (v4) and DX7 (2nd gen.)

Programming flaps

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Roger Williams05/11/2017 16:29:56
4 forum posts

Anyone tried connecting the Lemon Stabiliser and programming flaps?

I'm trying to program flaps on my FunCub when using Dual Ailerons (needs differential). I'm trying to use Aux2 for the flaps. Aircraft Type = dual ailerons allows the Gear channel to operate the Stabiliser (Green LED only), but provides no flap function. But when I select Aircraft type = Dual aileron + one flap to give flap function, the Gear channel refuses to switch the stabiliser! I might add that I need the BEC plugged into the Gear channel as this is the only empty socket.. I guess I may need to reassign channels somehow but I'm on the limit of my programming ability here!

Anyone any ideas please, I'm struggling?

Cheers, RogerW

Percy Verance05/11/2017 19:26:45
8078 forum posts
155 photos


I recently programmed an Orange flight stabilizer for someone, and the (awful) instructions did clearly state that differential aileron could not be used/would not work with it. Not seen a Lemon one, but maye they're similar?

Can I ask why a stabilizer with a Fun Cub, they're as steady as a rock?

It also may be helpful if you could tell us what transmitter/receiver you're using here, as someone could well have already solved the problem. You mention plugging the BEC in. Why are you using a seperate BEC? Surely the ESC provides a BEC function?



Edited By Percy Verance on 05/11/2017 19:38:09

Denis Watkins05/11/2017 19:57:55
3675 forum posts
173 photos

This depends on you dropping one of the choices you made

2 channels on aileron, a cub needs just one

And the gyro on/off on AUX

If you want to leave flaps free to work, these are not on a stabilised channel

- True diversity dual antennas with independent processor for monitoring singal on both antennas
- Antennas extended for carbon fuselage / metalic structure installation
- 7-Channel receiver when stabilizer is disabled. (AUX2 located at bind position)
- Supports Flaperon by switching J6 to on position while setting the Spektrum transmitter wing type as Flaperon
- Gear channel for remote stabilizer on/off
- Remote master gain on-the-fly adjustment on AUX3.

Using the stabilizer as 7-Channel Receiver
- Turn off J1 to J6
- Follows normal binding procedure by inserting bind plug to the bind location and enable binding on transmitter
- Bind location will become the 7th channel. Use ESC with BEC on throttle channel for supplying power to servo



Edited By Denis Watkins on 05/11/2017 20:07:22

Percy Verance05/11/2017 20:08:46
8078 forum posts
155 photos

Unless I've read/understood it wrong Denis, Roger seems to be attempting to mix flap function into the existing ailerons? Quite why I'm not sure, as the Funcub does have separate flaps. Perhaps he's short on servos?

Roger Williams06/11/2017 12:16:37
4 forum posts

Hi Guys, thanks for the comments.

The transmitter and receiver type are in the title.

I want to check out the Lemon Stabiliser because the FunCub is stable so that I can learn how it may work with unstable planes.

Being a high wing aircraft I believe the Cub will benefit from aileron differential as per the build instructions.

I am trying to program dual aileron and separate flaps with a four servo wing.

The Ailerons are on AIL and AUX1, the Flaps (on a Y lead) are on AUX2, the Gear channel has the BEC connected (power only). I'm using a BEC because I have experienced brown-outs at our field with four servo models and this one has six servos.

According to the Lemon instructions on RC Groups this should be possible, but the Spektrum DX7 doesn't seem to want to play ball and offer me Flap settings with the Flaps on AUX2. The Stabilizer also cannot be switched in this configuration.

I may have to revert to a Y-lead on the Ailerons in order to get flaps (on AUX1) AND control the Stabiliser ON/OFF with the Gear channel, but I just wanted to check if others had been this way before and solved the problem.

Thanks for your comments anyway.

Denis Watkins06/11/2017 14:27:37
3675 forum posts
173 photos

All is revealed now Percy, as it turns out, Roger knew what he was doing, exploring possibilities.

Just as an observation, these stabilisers really come into their own on less manageable models

Steve J06/11/2017 15:44:21
1151 forum posts
38 photos


1) I would splice the UBEC into one of the aileron or flap leads. On my FunCub the power from the UBEC went into the receiver via a short extension plugged into an AR8000's bind/data port.

2) I would be tempted to see if the DX7 gives you more flexibility in glider mode than it does in acro.

3) Have you tried inhibiting aux2 and then using a free mix to copy the gear channel to aux2?


Steve J06/11/2017 19:52:03
1151 forum posts
38 photos

Upon reflection, I realised that (1) and (3) probably aren't going to be a lot of use to you, so here is

4) In wing type set dual alierons, no flaps. Set aux2 to use the switch or slider that you want to use for the flaps. FunCub flaps need elevator compensation. As you are now not using the flap system, I suggest enabling flight modes on the same switch and, in the trim menu, changing the elevator to flight mode (once you have the trim changes worked out, you can move them to a mix).

This works on the DX9.


Roger Williams06/11/2017 20:09:32
4 forum posts

Hi Steve, I like the look of your possible solution, sounds like it has all the features I need. Can I assume this uses the Glider mode as you suggested in your earlier post? It also shouldn’t mess up the stabiliser switching on the Gear channel. Thanks I’ll try it. Cheers, RogerW

Steve J06/11/2017 20:30:19
1151 forum posts
38 photos

(4) is acro. I would still have a look at where the DX7 puts things in glider mode as the Airware flap/camber system is quite powerful.


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