Large Model Association Forum

Could I have some tips or advice on setting up twin servo ailerons?

Is it better to use seperate channels for the servos or use a Y lead and then programme one of the servos to match?
And how is the best way to go about it...pictures would be a help .
Thanks

totally depends on size, weight and what model it is, plus what is your receiver set up. before any real advice can be offered.

if the model is under 20 kg its a different set-up to a model over 20kg. If its a sports model its different to a non sports model and again its different depending on receiver set up and servos used ie LV or HV, low torque or high torque. please expand your question.

It's a scale mister mulligan dga-6. It's 18.5Kg, so nearly on the 20kg but I'd rather be on the safe side.The wings are 13' span, which is slightly over scale ( I didn't build it.....purchesd elsewhere).
Mark Weeks from Plymouth has been down to see it and recommended twin aileron servo set up. It has flaps as well.
It will be powered by a 62cc petrol. I'm not looking to do aerobatics with it, it's just a big cruiser. I've used Hitec hs645mg servos on all surfaces so far.
I will run a mini power distribution board so will have dual battery with back up.

Can't think of any thing else at the moment. Is that of help?

Assuming you have a modern radio with enough channels I strongly suggest you use 2 channels for the ailerons. The model will need differential on the ailerons (more up than down) and although it is best to set this mechanically via the correct linkage geometry it is nice to be able to "tweak" it via the radio during initial flight trials.
Hi Tec 645's will be fine for the ailerons but if you have big flaps they may struggle with 645's unless you have a linkage that increases mechanical advantage as the flaps lower.

John

I may have misled people in the post...what I meant was 2 servo per aileron, making 4 servos in total. Sorry

You shouldn't need more than one HS645mg per aileron on a 13ft plodder as you've described.

If you want to though, it would be better to stick them on seperate channels so they can be tweaked if necessary so they both have the same movement.

I may go mad and get a powerbox competition. With servo matching and battery redundancy....kills two birds with one stone.

Always used Powerbox, best there is imho

Well, with permission from swmbo, I will purchase a Powerbox Competition. Cheers Robbie and Rob.

As you only need one aileron servo on each side and you can plug each into a separate channel and use the transmitter functions for fine tuning the throws and differential why do you need a Powerbox competition ?
all you need is something to provide battery redundancy and a Powerbox sensor switch (or even 2 switches and a pair of diodes) will do that for a lot less money !!!!?????

John

Mark Weeks, who inspected the model, has recommended twin servo ailerons. I appreciate your concerns John-thank you. I would rather have an extra layer of insurance. At least I know that I have everything possible.

PowerBox ordered

I'm a bit late to the party here(just joined) but as mentioned, the Tx. you use may have a function for this. I fly with a JR DSX11 which has a 4 wing aileron mix, essentially for biplanes with one servo per surface. However I used this on my monoplane with 2 servos per surface. It also has a servomate function allowing you to match another channel to elevator/aileron or rudder eliminating the need to use a dedicated mix.

I'm sure the powerbox will do a better job but an option for the future perhaps.

Cheers
Chris

The Power Box Proffesional is a cool bit of kit. The Stevo matching works a treat. I first tried it on the elevators...really precise. The battery monitor seems accurate.

If anyone plans to get one, watch the polarity. There is a chance that you will risk terminal damage if you get your battery wires crossed.