hey all ,
i'm planning to buy Great Planes Extra 330S 27% , Da-50 and i have 5 servo (4 Spektrum DS821 Digital Sport Hi-Torque and 1 futaba stantard 3004) so i will use 2 on aileron and 2 on pitch and 1 throttle and am gonna buy 1 Hitec Digital Hi Torque HS-5645MG Metal Gear for rudder . am gonna use 6v battery

is it ok this combo?

thx

You need at least 140 torq on the ail. if using 2 for the ele. then go 140 on those also. For the rudder useat least 200 oz inch. I use Hitec 5985 on elevator and ale. and for the rudder i use 5955.

ok thx , well am short in money so i was thinking of cheap servo and i found those GWS S666NF 18.5kg HEAVY-DUTY for rudder and for ail S15CLN-MG-BB 7.5kg r those servo good?

From the manual:

"Six servos with a minimum torque of 98 oz-in are required–
one for each aileron, one for each elevator and two for the
rudder. A standard servo may be used on the throttle. Futaba®
S3305 servos (FUTM0045) are shown on the model in this
manual because they are a suitable, relatively economical
solution to the high-torque requirements, but there are also
higher-precision servos available if this is your preference."

Now granted, they call for duals on the rudder, so a single 200 would be appropriate... but why do you suggest 140+
on the ailerons? Is this personal experience, or just safe over-engineering on your behalf?

I ask because I am about to drop the cash for this same setup, only I had planned to use the recommended 3305's (99 @ 4.8)
for economy's sake as well, and plan to use the ganged pull/pull for the rudder. I could easily hold out for the cash, and
wait to get, say, 9156's, but the cost differential is just overkill as far as I see it.

Please, correct me if I'm wrong. This is going to be the most substantial aircraft build I've done to date, and although
I feel comfortable ripping through most 3D maneuvers, the last thing I want is for a 1500-2000$ aircraft taking a
dirt nap because I skimped too much on servos.

If you wanted to save some dough, you could have got the dl instead of the da....$300 savings right there.

amount of torque and type of servo for any given surface is a very subjective question, if you ask 100 experienced pilots you will get 100 different answers.

And to make matters more complicated, everyone has their own style of flying putting different amounts of stress on the surfaces.