Official Freewing Twin 80mm EDF A-10 Thunderbolt II Super Scale V2 Thread

[Flyinrazrback]

Has anyone had any issues with using adapters on their batteries to change the plug type? I have a bunch of SMC packs with XT90s and was looking at using one of those XT90 to EC5 adapters

[f4u ausie]

Has anyone had any issues with using adapters on their batteries to change the plug type? I have a bunch of SMC packs with XT90s and was looking at using one of those XT90 to EC5 adapters

All my batteries r xt 90 i have changed all to xt90 but previously used an adapted,, never had a problem

[xviper]

My batteries have different connectors and my planes (55 of them) have different ESC connectors. They don't always match. I used to change connectors on the batteries to whatever would fit the most planes but that got difficult real fast as the hanger grew and the battery numbers grew. I started using adapters to save time and effort. Most of the time, it would involve one adapter but on rare occasions, I would have to gang 2 to 3 together to make it work when I just didn't have the "right" one. I try to restrict this option to low draw applications but keep it to 1 adapter for high draw planes like EDFs. Once in a while, the connections would get hot. In those cases, I found that the soldering was sub-par and I'd go in and strengthen the solder. That would cure the heat situation. They way I use adapters have never presented a problem.
Consider that in many cases where you need to put 2 batteries together in series to "up" the cell count or when you put 2 together in parallel to increase the "mah" capacity, you are using an adapter. It's a "tool" or an aid.

[I_Fix_Planes]

Hi all, can the twin 80MM A10 esc's be wired in parallel to run on just one battery? If so, how does that affect the UBEC? Thanks in advance.

[xviper]

Hi all, can the twin 80MM A10 esc's be wired in parallel to run on just one battery? If so, how does that affect the UBEC? Thanks in advance.

Please clarify .......................... Do you mean you want to still use 2 batteries that act as one? IE, twin the existing connectors and then split them again to hook up 2 batteries? Or do you actually want to run 1 battery? Electronically, of course you can, but if you run only a single battery, balancing the plane at the proper CG will be hard. If you run a single 5000mah, you 1/2 the flight time. If you run 10,000mah single battery (if you can find one), it won't fit. As far as the UBEC is concerned, it's still wired to one of the leads, so it doesn't care unless you goof up the twinning and end up with a serial connection.

[I_Fix_Planes]

Hi, thanks for the reply, I would like to use a esc plug adapter that Motion sells which in effect joins the esc’s together in parallel and provides for a single ec5 plug, to run a single 9500 mah 6s battery.

[xviper]

Hi, thanks for the reply, I would like to use a esc plug adapter that Motion sells which in effect joins the esc’s together in parallel and provides for a single ec5 plug, to run a single 9500 mah 6s battery.

Have you checked the dimensions of that battery? Will you be able to close the canopy where it has to live in order to achieve the proper CG?
BTW, you can easily make your own parallel adapter.

[Alphonso]

I'd be more concerned with passing 250 amps through one EC5 connector

[xviper]

I'd be more concerned with passing 250 amps through one EC5 connector

So true. At peak, a "decent" EC5 can withstand ~200A for a short burst, 150A under normal operation. A "bad" one could cook itself. A different connector should be entertained. Or fly at 3/4 throttle the whole time.

[xviper]

So true. At peak, a "decent" EC5 can withstand ~200A for a short burst, 150A under normal operation. A "bad" one could cook itself. A different connector should be entertained. Or fly at 3/4 throttle the whole time.

I'm having to rethink this. When the power flows from the battery thru the EC5 to the ESCs, does the connector actually see double the amps? I can see it if the power went the other way - ie, from the ESCs thru the connector and then to whatever is accepting the power ..................... (hypothetically say, going from the ESCs, then joining up in parallel and then splitting again to the motors - then the "join" gets double the amps.)

[Evan D]

It does double and the standard "banjo" style EC5 will melt. Many that have 80 and 90mm EDFs running over 100A melt them. The split type of EC5 is better but will not hold up to 200+A. I would make my own parallel adapter where you have XT150 connectors on the battery and input to the parallel adapter and then, if you want EC5 to the ESCs. I also would suggest changing the EC5 connectors on the ESC to the better split type. Here are the two types of EC5 male pins, "banjo" on the right.

[Alphonso]

I don't think a 9500 mah pack will CG. It may well fit in the rear lipo space as I used to use 2 Turnigy graphene 5000s in my V1. Stacked on top of each other using a 400mm strap. Those packs were huge and very heavy and I doubt his 9500s are anywhere the size and mass of those. Therefore he will need to mount his pack forward of the very large rear lipo area which will be impossible. Furthermore the current fans weigh 200g combined more than the originals making lipo placement even more problematic. I wager about halfway between the provided spaces, so quite impossible.

In short, inadequate connectors, no space available for achieving CG. I feel you're just making it hard for yourself. Just buy 2 x SMC 5200 80C green labels, really cheap and light for what they are.

[GliderGuy]

Evan…good point and adding that every connection spark vaporizes a tiny bit of the banjo spring. So, what works today may not work in the future. The banjo type have a more limited lifespan…I have proven that several times.

The split type hold up much better under repeated use.

-GG

[GliderGuy]

Yesterday’s Final Flight of the day.

Love this bird and Texas weather!



-GG