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Umm depends what sort of scale i spose, like 2 blade 3,4,5 blade head, tail type would also have to be thought about, i would assume that the more blades-headgear the more load to the servos wieght of scale body used. my apache 500 is running ok on align 510's and 3G with four blade head. i'm planning on a HIND with a Trex 600e in it i will have a five blade head n three on the tail. i'm thinking for this, a Baest X (when thay turn up!) and Spectrum 6040's (13kg@6v) i use them in both my 700n beast and 600n 3G. at the moment i am using mah per flight (rx) 450, 350 ish and the apache dose about 300mah per fly't ,flt times of 10mins nitro n four on the AH64 i don't know what you would expect to get per flt but it seems ok to me.
i know 6040's are a lil more dosh but i think worth it, plus spectrum's after sales is PDQ top banana!
GAUI X7 Beast X V3 (a nice bit of fish!)
Trex600n Fbl ys56sr BeastX V3
Trex500Fbl AR7200BX
Trex500 Apache x4bld BeastX. Trex 600E HIND mil x5bld BeastX
DX7se
Like everything else in life, it kinda depends on your budget, but if it were me, I think I'd want sensible digital servos that are accurate and hold well. I wouldn't want to risk my scale pride and joy to cheap and nasty servos and equally I wouldn't need blisteringly fast servos or 6-8V power supply systems.
I would suggest a regulated 5V system with JR 8231 or 8321 cyclic servos. You won't need to worry about a tail step down and these will give your scale heli all the accuracy and hold that it needs, and will be reliable as hell.
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