I have been reading but have not yet had anyone at the field say that they have had an experience with this new BEC cutout thing when using high technology servos. Has anyone had this happen using an E-Flite speed control with E-Flite S-75 servos?

Linear BEC`s usually are able to deliver 1-1,5Amp only.
The small servoes we use in our small toys have large differences in how much amperes they consume. This means that 3 servoes are not 3 servoes... The difference in current consume could be huge!

I have some Graupner servoes, and they have good specs telling everything:
The C261 is a beauty for depron, and draws max 450mA.
The DS281 is a digital beauty with same specs appr, and draws only 285mA max. Digital, and half the amperes.
But the DS361 which is digital too, slightly more torque but a lot more of holding power draws max 610mA... Digital and 50% more amperes.

Then you get a standard servo like the C577 which is at less than 900mA. Although it weigh 5 times of the small ones [X(]

People often think that small servoes use little current, but it is not true. Either you should buy servoes where the specs are given, or you have to measure it yourself. Be prepared for surprices.

BECs usually cut out when the consumption is too large, or temp gets too high. Don`t think this is related to spesial BECs.

Don`t know the S-75 servoes, but I have not heard they are worse than others.

Parkilot:
Just don't use more servos than what they say. Usually four on two cells and three servos on three cells. I tried that on a CC ESC and it overheated and shut off all power to protect itself. went to three servos and everything was fine.

Thanks for your reply but how will I deal with this problem because my plane needs 4 servos (regular-non digital s-75s). I need to use a 3 cell battery(2100). The option that I am now looking at is running a four AA on board battery pack and switch for my radio but I do not want to add all of that weight. I will end up with a freight ship hauling all kinds of goodies around wondering why I am having problems with vertical and so forth.

[&o][:-][:@]

Another option for more servos is to use a Ubec. It's a separate BEC that's wired into the lipo. The ones I use are the Hercules made by Western Robotics. A google search will bring it up. Handles eight servos.