Originally Posted by IndyMatt
So those were what 6" takeoffs! That is nuts! Are you running the 3S packs fully charged? Also do they balance through the same UMX battery connector just like the 2S packs? Making it very tempting!
You are flying the B3D & not the V1, right?
Yup - a 6" takeoff roll sounds about right. At 40% throttle.
Yes, many of us are running fully-charged 3s packs. Check the Beast 3D thread. There are a number of posts about running 3s in the B3D, along with a some of videos. As Erkq noted - we have yet to see a failure on 3s with the AS3X brick. The 2300Kv/5043 combo seems to be the best choice for 3s, although a number of people are running the stock 2500Kv w/5030. If you happen to have a 2300Kv motor from a V1 Beast sitting around, it's worth the swap - even on 2s. On 2s, the 2300Kv/5043 combo dramatically outperforms the 2500Kv motor on any commonly-available prop - and it also draws a lot less current.
RCBabbel makes ultra-light Hyp 180 3s packs that fit under the cowl & plug right in. They're light enough that it's still easy to get the CG right, despite the extra cell. The packs use the UMX connector for hot & ground, but they have regular 3s balance taps. Erkq & others are running TP 250s, but I don't know how the fit is. If you're already using a UMX charge adapter harness for your 2s UMX packs, you can use the banana connectors to charge the 3s packs. However, you will smoke the pack if you forget to disconnect the adapter's 2s balance tap from balance-board before connecting the 3s tap from the pack:
First, be sure to disconnect the adapter's 2s balance plug from your balance-board, then connect the UMX connector to the Hyp 3s pack & plug the pack's 3s balance tap into your balance-board. Warning: Never, ever connect the 2s balance plug on the harness & the 3s balance plug on the pack to the balance-board simultaneously!! Doing so will immediately short one of the cells, which will puff within milliseconds.
I accidentally smoked a barely-broken-in 3s Babbelbatt by doing that!
Alternatively, just make a two-conductor UMX-to-banana cable for charging & plug the pack into your charger like you would any larger pack. That's the safest way to go, as it eliminates the possibility of simultaneously connecting the 2s & 3s balance taps to the board.