Do any of you feel that a battery isolator system is necessary for a 28% Edge with the following servos/gear. A JR 649 9ch PCM RX (2) Hitec 5945's for the elevator servos, (2) Hitec 5945's for the aileron servos (1) Hitec 5955 for the rudder, and (2) 425BB for the Throttle & choke. Running these seven servos will be dual 6v packs (Size and type to be determined later).
I was also wondering if the stock 1” aluminum Hitec servo arms will be long enough for the WH 28% Edge 540t or should I go with longer arms?

Thanks WW2 Ace

A battery isolator is not needed, at least in my opinion. I have used dual batteries in quite a few planes, and done tests about one pack charging another, and while there are a lot of myths running around, there really isn't a need to worry. Two packs and two switches works very well.

Generally the stock aluminum arms aren't long enough for 3D type throws. If you want to set up the throws listed in the manual, you will need longer arms.

HTH
Jim

I agree with Icebird. You will need servo arms 1-1/8 to 1-1/4" to attain the large control throws. The short metal Hitec arms won't cut it for large travels.

Invest in the AirWild MLP arms for Hitec. They come in different lengths in either half or full arm. They also make them for JR. They will give you what you need for 3d throws. Even if you dont fly 3d right off, its nice to be able to have the amount of throw for anything you might do in the future. The MLP arms have a nicely designed hub that fits on the servo to eliminate any slop that might occur when the servo arm is stressed. If you look at one online you can see what I am talking about.

I would think the only reason you would need the isolator is if you were having interference problems with just the batteries and regulators. I dont think this will be the case though. In case you did want one I4C makes one as well as SmartFly.

I personally don't think the isolators are needed either. I use 2 6v receiver packs on 2 seperate switches plugged into 2 free channels in the reciever....Hitec digitals all the way around..... no isolator or the like. Over 200 flights on my 28% Edge without a hitch. I also have the AirWild MLP servo arms on all my servos except throttle. 3" on the rudder pull/pull and 1 1/4" on everthing else. Using the Rocket City/Dubro style control horns that Tom supplies in the hardware pack, you can get 50 degrees + travel on the surfaces. The arms are very nice. I personally like them better than the SWB arms myself. they put the load closer to the bearing on the servo ouput shaft.

Cap

My feeling on isolators and power boxes is well known. They just add complexity to solve a problem that you don't have.

Now, when you get to a plane with 14 highque servos that's another story, but with 5 servos use 2 batteries and 2 switches into a single rx.

TF