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Dual elevator servos and flap mix - AAARRGGGHHH !

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David Banks 118/04/2017 20:07:42
5 forum posts

DSX9 - I am using 2 servos - one on each elevator - by having a mix between ELE & AUX4. Works great!

I want to add 5% down elevator at half flap and 10% down at full flap.

I have activated the FLAP SYS in the menus but when I add the 5% and 10% and lower the flaps it only gives the down elevator trim to one elevator! The one on the ELE channel - the AUX4 side doesnt move.

I have tried all sorts inc threats about F#T#B# and swearing at it

Am I missing something or is there a better way of achieving this?

Thanks in advance.

john stones 118/04/2017 20:20:50
11591 forum posts
1517 photos

Inhibit the switch for AUX 4 ?

Steve J18/04/2017 20:23:26
1975 forum posts
54 photos

Why are you using a mix? You should using the mate facility for dual elevators.


PS Mate is in wing type (system menus). You will have to inhibit the channel that you want to use in devicesel first and I don't think that it will let you use aux4.

Edited By Steve J on 18/04/2017 20:33:08

Denis Watkins18/04/2017 20:24:37
4527 forum posts
122 photos

Why not set the wing type to flaperon

And adjust the movements from there

Page 44/45

David Banks 118/04/2017 20:50:38
5 forum posts

Aux 4 switch is inhibited

I tried to mate in the high level menu but the only option to mate with Ele channel is Rudder ?

I havent tried the Flaperon option yet

Thanks for your suggestions

Dave Wilshere18/04/2017 21:26:42
56 forum posts


You have to go into device select and inhibit all the channels you are not using on Aux4. Then it will be available.

But JR default is Aux 3 for the second elevator.

When setting up a new model inhibit all channels you are not using, then select wing and tail type, Flap system and its easy

Gary Manuel18/04/2017 21:34:29
2276 forum posts
1552 photos

Yes - what Dave and Steve said - not sure about default channel though - I think you can assign any un-assigned channel as the slave.

You'll know when it's right because the 2 elevator halves appear as "RELE" and "LELE" in menus / monitor screen.

David Banks 118/04/2017 22:17:18
5 forum posts

Thanks guys - looks like I cant do what's suggested.

Only aux2 and aux3 show as available channels to use a slaves for elevator and I have used those for the two flap servos and two aileron servos leaving no options. Aux 4 doesnt show as an option anywhere? I need all 3 aux channels to show as options for that to work.

I think I have found a workaround - I have mixed ele and aux4 - that got the two elevators working.

Then I mixed left flap with left ele and right flap with right ele and playing with the % I now get down ele with flaps.

It's a very old DSX9 - maybe thats the problem? Must be 10 years old !!

Thanks for all your help. Maybe time for an upgrade.

Denis Watkins19/04/2017 06:52:14
4527 forum posts
122 photos

It is not because it is old David; if you think back to 4 channel 35mhz, we flew flaps. My current 6 channel delta has ailerons, 2 position flaps, simply with ailerons on a Y lead.

The glider boys have spoilers/airbrakes, crow etc etc, as well as aileron, elevator, rudder, on these Tx.

When the surfaces are assigned correctly, the 5% can be added, to the channel

Or slow down before deploying flaps

Just a note, 20 - 25° flap is usually adequate on a model

Keep on trying,

Steve J19/04/2017 08:01:32
1975 forum posts
54 photos
Posted by David Banks 1 on 18/04/2017 22:17:18:

Only aux2 and aux3 show as available channels to use a slaves for elevator and I have used those for the two flap servos and two aileron servos leaving no options. Aux 4 doesnt show as an option anywhere?

I would advise moving things around so that you can use the mate function.

The DSX9 is a nice transmitter. The main reasons that I now use a DX9 are the voice and telemetry functions on the DX9.


Frank Skilbeck19/04/2017 08:04:37
4750 forum posts
104 photos
Posted by Denis Watkins on 19/04/2017 06:52:14:

Just a note, 20 - 25° flap is usually adequate on a model

Depends what you are trying to achieve, if all you want is extra low speed lift then yes, but if you want lots of drag to allow steep approaches and short landings then 60 degs can be more beneficial. On my old Maule and Beaver I had 15 deg for take off and 60+ for landing. My HP 18 glider drops them 70 deg of so on crow braking.

Steve J19/04/2017 08:15:54
1975 forum posts
54 photos

Indeed. Landing flap on my P47 is around 60-70 degrees and my four servo wing gliders have even more flap movement.


Peter Christy19/04/2017 08:45:23
1829 forum posts

Why not simplify the problem by using a "Y"-lead for the two elevator servos? That way, you would only be using one channel for the elevator function, which would make mixing in flap trim much easier.

I use a "Y"-lead for models using two aileron servos - one in each wing - and not had an issue with it....



Shaunie19/04/2017 08:52:04
951 forum posts
78 photos

I don't know if this is relevant or not but with my DX7 (the original one, which apparently was made by JR) you had to set "trim include" to on so that trim is carried across with the mix.


Denis Watkins19/04/2017 09:28:59
4527 forum posts
122 photos

Ah ! but Frank,

And Steve

You can fly properly

A novice could read this, dial in 60° flap, then Wayhayyyyyyyy ! he he

Edited By Denis Watkins on 19/04/2017 09:32:49

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