Brushless efficiency ??

[Igoreski]

Can someone with a good brushless background answer a couple questions about KV / voltage efficiency.I ran 2- 380XL 2930kv motors on 3s which was fast but drew a lot of amps.If I ran the same size motor / prop combo with a lower kv around 1480kv but much higher voltage 6s would that run lower amps and be more efficient given that the RPMs would be about the same.[2] Would two 5000mah 30c 3s joined in series give you 6s but cut your run time in half compared to running the same battery packs by themselves,one on each ESC.

[steveo]

#1 higher voltage = less amps at same rpm- in perfect world you gonna draw half the amps with 6s
#2 i would think that your run time might be the same your drawing less amps at 6s but with only 5000 mah feeding both motors, but i am not an expert

[steveo]

6s per motor would best for amp draw and runtime

[Igoreski]

Thanks, I wanted efficiency but wanted to use my abundant supply of 2s & 3s battery packs.

[drwayne]

Use 3S2p with your 2930's for double runtime ...

6S1P with1480Kv equals similar as 1930 on 3S1P runtime

W

[Igoreski]

The 3s on 2930 is the amp draw problem so adding 2p would only add weight making it worse.I have 2 120a ESCs and 2 motors.

[drwayne]

Use 3S2p with your 2930's for double runtime ...

6S1P with1480Kv equals similar as 1930 on 3S1P runtime

W

Doh.
6S1P Vs 3S1P.. of course it has twice runtime.. but similar total rpm at prop.
Late night here in Au ..getting my thoughts confuddled.!

W