i have a edge 540 aeroworks 29% with a zdz 60 im trying to figure out what kind of servos to run in this plane im new to biger gasers, do you need digital servos? what are digital servos or coreless advantages, it has pull pull on rudder and split elevators 1 servo required per aileron, what kind of radio do i need to run pcm? and help would be great please email me at [email protected]

Check these out, can not be beat for the price.

http://www.servocity.com/html/hs-564...al_torque.html

One thing better about Digital servos is that if there rated at 160oz of tourqe that means they will hae 160 oz's of tourqe all the way through the entire throw range unlike normal servos.

Normal sevos would only have 160oz's at the full arm deflection.

If im wrong please somebody correct me, this was one of the advantages i read in a servo shoot out

You're pretty much right on there. These are actually pretty nice servos for the $$. They are actually 168 oz-in and .15 sec at 6 volts. Make sure to use 6 volts to get the best performace out of them. I have these on a CAP232 25% and they are great servos (way overkill for this size plane though).

icando: many radios will do PCM. Check out Servo city's stuff. Futaba 9CAS will do PCM and is a great radio for giant gassers.

Dealspeed - the expanation was not quite right
torque is torque is torque ----digital or analog circuitry.
The difference is HOLDING TORQUE or "holding power" in the advertisments.
All servos follow the input from the TX control stick-
The servo moves to align with the stick position.
Pretty straightforward--
Here is the difference:
As the servo approaches perfect alignment with control input (stick control)--the power to the servo motor lessens -until it is simply sucking enough to center.
As you move the stick OR if the control surface tries to move --more power is fed to the servo motor as needed to HOLD the intended position.
Analog feeds this power in a smooth , rapid curve .
BUT
Digital will provide full power to the servo motor, quicker- which means it will HOLD the intended position much better
This is a very important feature because most precision flying is done using teensy weensy stick movements.
In actual practice -this feature can be felt, simply trying to move the control surface a little bit
It feels "locked in" on the digital and a bit softer on the analog
That's it . All the hubub about differences is just in how well the servo HOLDS position .
And that -is very important for preventing flutter and providing accurate control
It means nada as for total ability to move the surface ( that is torque rating)
Servo speed rating -yet another rating - is another misleading term.
If the load on the surface is low --really low - it can move faster but typically these servos trade speed for power and that is simply not a good trade off.
Best servo?
ANY digital-- properly sized and using good linkage and using maximum rotation to surface throw ratios.

Seems that there was more unanswered question here: Coreless servos have a faster acceration than the non-coreless servos. This is because the coreless have less inertia (weight) and can respond faster. This may not be an issue for your type of flying but I thought I'd take a stab at explaining it. The 5645's are 3-pole and the 5945's are coreless. If money is no issue the 5945 is the better choice.

thanks guys, for all the explanation of servos, would you all run dual recievers or is this overkill as well?

I wouldn't do dual receivers. I'd use a redundant battery system though. Some say this isn't necessary either, but I do it on anything 1.20/25% and bigger. I figure even spending $60 extra bucks on a Li-ion, regulator, and switch is worth it for an airplane that cost me over $1000. Of course, you could bring it down to somewhere around $30-35 depending on what you buy. I just like lithium ions but I also like NiMH.

Thanks for the greta info guys, always to see some good explanations on the differences [8D]