TBS 4s Recommendations

[shazzy]

Making the switch to 4s, anyone have recommendations for a 4s battery on a TBS running sunnysky 980KV, 10x5 carbons and a 3axis gimbal (total wait around 1350g without batts)

[Revs]

Hi Shazzy. Have you worked out what kinda amp flow you';re gonna be pulling with that setup?

Also on a 4s with 980kV and 1050 props I suspect you may be asking a bit much of the motors/ESC';s. I have 700kV';s running 4s with 12x4 carbons and it';s pulling about 20A per motor.

[shazzy]

Hi Shazzy. Have you worked out what kinda amp flow you';re gonna be pulling with that setup?

Also on a 4s with 980kV and 1050 props I suspect you may be asking a bit much of the motors/ESC';s. I have 700kV';s running 4s with 12x4 carbons and it';s pulling about 20A per motor.

Based on the below video I should be pulling 16A max on 4s and 10x5 blades.
I';ve run 11x47 inch props cut to 10 inches and it works fine on 3s!

https://www.youtube.com/watch?v=VuupNMUhSz4

[Revs]

Ah so you';re ok... just. Those motors are rated at 15A/30sec. Just don';t use a more efficient prop. SunnySky say an APC1047 draws over 20A on a 4s with those motors..

http://www.rcsunnysky.com/html/2014/xseries_0916/11.html

So the next question is; have you set a weight limit or desired capacity?

[shazzy]

Ah so you';re ok... just. Those motors are rated at 15A/30sec. Just don';t use a more efficient prop. SunnySky say an APC1047 draws over 20A on a 4s with those motors..

http://www.rcsunnysky.com/html/2014/xseries_0916/11.html

So the next question is; have you set a weight limit or desired capacity?

Would like to have roughly 15mins flight time. With a 3s 5000mah i was getting 22mins . Was looking at some zippy compacts and turnigy 5000mahs.

The new green multistars look interesting but dont know the quality.

[Revs]

I';m using a MS 4000 4s in mine and I';m pleased with it, but I just fly around on GPS so nothing too demanding. As long as you';re not blasting round at speed they';re a good way to go IMO.

Also, don';t forget  that a 4s 5000 will weigh 33% more than a 3s 5000 and will last 33% longer. A 3750 4s is similar in overall capacity to a 5000 3s. So if you';re want to sacrifice flight times for weight saving, something like a 2500-3000 is prolly in the right ball-park.

So lets say 3000mAh and you';re drawing up to 60a, you';ll need 20c minimum, but I';d go 25-30c personally. I';d say these would be a good way to go...

http://www.hobbyking.co.uk/hobbyking/store/uh_viewItem.asp?idProduct=11920

http://www.hobbyking.co.uk/hobbyking/store/uh_viewItem.asp?idProduct=21350

Both are under 300g and should give an improvement in performance while still doing 15min flight time.