RE: *Seagull Extra 260 90 ARF*
I have the Futaba 3152 digitals all round and a 3001 on throttle
The 3152 is about the same spec as the Jr821 at 5kg / 4.8v and about 6.4kg / 6v, which is 88oz in/6v
I'm using a 2s Li-po and 6v regulator for power
I find the 3152 adequate for rudder but slightly spongy
But not having tried a stronger servo for rudder, I'm not sure if it's just the way the rudder is on this plane
If you're into hard 3D, then a stronger servo for rudder would be better
My 2s 2200mAh Li-po / regulator is good for 6 x 8mins of hard flying, using about 1500mAh from battery
I would definately NOT use a 'AA' cell pack on digital servos doing 3D
Do not use thread lock on your JR821 servos!!! it will make the spine brittle and snap