RE: digital servos
Neutral in the servo is where it is not trying to move one direction or the other regardless ofwhere the stick is. It can be at any point of travel. Center is different, On flaps, if the servo is binding at full up, a digital is going to draw more current than an analog, but the analog will also draw more current if the it is stalled before reaching neutral.Just like a throttle servo that has the end points off and at full throttle is jammed and is going to draw more current. The Digitals have a better resolution at center for the most part. If you put a little pressure on the digitalservo while it is centered, you will hear it start to buzz as it if fighting to get back to the neutral condition.
After doing some testing a while back on different servos, I found that the name brand digitalservos, IE Futaba, JR, Hi Tec, etc were better at returning to center than the analog servos. The worst of the bunch I tested was a Tower Pro Digital 995 metal gear that was selling on Ebay for very little money, something like $6 each for a 100 in oz plus. It was awful. The best centering was a Futaba Rudder Servo a 9254, for a gyro. It was lighting fast and the return to center was very precise, 0.8 degrees while the Tower Pro wallowed around 2.5 degrees. Surprising that the next best was a Futaba 3004 at 1 degree.
My 2 cents worth, I like the digitals. The price difference isn't as great as it was 6 yeas back, and with the availability of the 200mah NiMh 4.8 packs at very little weight difference to a 500 mah NiCd packs of old, the extra current draw isn't an issue.
Don
Edited to correct the best servo number and to add servo types