I am new to the giant scale 3D birds, and I will set up a 33% 3D plane soon and am buying right now all needed stuff. I have already 4 JR 2721 servos (116 oz & .18 sec) on hand, so I really would like to use those (at least on ailerons), so I don't need to buy new ones. My question basically is : Are the 2721's strong and fast enough for 33% applications (for 3D flying), and also : do you use a matchbox for non digital servos also so they don't fight each other, or are the matchboxes only for digital servos and not needed for the 2721's ?
Can I stay with the 2721 servos or should I buy 8411's for the rudder and elevator and just use the 2721's on ailerons or go all 8411's ?
Thanks

What is the plane and what do they recommend? I have 8411's in mine.

After debating a lot and not being able to resist the good deal you can get on them , it will be a Hangar 9 Sukhoi just like yours !

SHWING


I put 4 8411's I had on the tail, and bought some non digitals for the ailerons. I also have 3 matchbox's

So that means the 2721's will be fine on the ailerons with a matchbox ? And then 8411's on the rudder with matchbox and 8411's on the elevator with matchbox ? So a matchbox is not only for digitals ?
Have I used enough the word "matchbox" ? LOL

Khm, for those not familliar...what is matchbox ?

Ill have to go look and see what I ended up putting on the ailerons, but one matchbox for each aileron, one for the rudder. Elevator is on two channels so I made it equal manually.

A matchbox is a JR until that you can plug 4 servo's into and adjust each independently, and only takes up one channel on the rx, I think everyone else has made them since too..

http://horizon.hobbyshopnow.com/prod...p?prod=JRPA900

i thought that analog servos such as the jr 2721's dont need a matchbox.. you just have to try and match the servos as close as possible but its not required to have a matchbox

You should be fine with 4x2721 on the ailerons. I use one 4721 on my Midwest Extra Rudder and it holds up fine. I also have the older H9 Extra with the wing that has one servo per aileron and I have an 8411 in each wing, and they seem to be holding up pretty well. I don't have the throws on the ailerons maxed out, but they are plenty efficient.