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T-REX 550 › 8s power setup
01-11-2015 06:18 PM  3 years agoPost 1
jason46

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MI

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I have 4s 4000mah packs that I use for a lepton and was considering using these for an 8s trex 550 that I'm piecing together. However, I have discovered this limits my motor choice and requires a pricier esc(vs. a talon90) and 8s would be a bit more complex. Would I see any longer flight time with an 8s 4000 setup or should I just go with a standard 6s 5000 setup.

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01-14-2015 02:13 AM  3 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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For an airframe designed for a 6S pack, how do you propose to stick two 4S packs in it?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-14-2015 03:01 AM  3 years agoPost 3
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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your head speed and gearing you choose would have more impact than adding 2 extra cells.
plus lets say you got the battery to fit. then your motor KV would need to be changed and most likely the gearing as well

even though higher voltage draws less amps.
I prefer to gear higher about 10:1 - 12:1 to lower the amp draw
with the right KV motor depending on cell count for the head speed I want to fly.

spending time, paying attention

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01-14-2015 10:41 AM  3 years agoPost 4
Richardmid1

rrProfessor

Leeds, England

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If you kept the headspeed the same yes you would see a slight improvement in flight time but 2 4s 4000 packs are going to be heavier than 1 6s 5000 pack so you would need to run a slightly higher HS for the same performance.

With the more powerful motors and higher C rating packs these days 6s is plenty in a 550.

60% of the time, it works every time!

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02-06-2015 04:17 AM  3 years agoPost 5
jason46

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MI

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For some reason didn't notice the replys.

Two 4s 4000 packs are nearly the same dimensions as a 6s 5000 pack.

I plan on running 520kv with 112T x 16T gearing.

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