Feigao 8XL/9XL Current Requirements
 

Relative to my EDF F103GT project I need to know the current requirements of both motors when running on 4s LiPo. Full-throttle continuous current is my main concern, but peak current would help as well. I'm trying to find a pack which will both fit comfortably in the vehicle and also be able to power the setup without issue. I have a 28x155x55mm maximum area that I can use for the pack.

I was thinking about these. Tanic Packs 4s 3650mAH 20-25/40C Would 70A continuous be enough?

I would try to go 100 amp continuous for those XL motors, if you can fit it. You could probably get away with less if you use high quality batts (flightpower).

On my setup I was seeing peaks of ~120A and a continous draw of around 40A. Now continuous draw didn't happen for about 3secs after a hard launch and the truck was upto full spd. Bashing/racing will be alot more peaky.

I would think if those are 40c burst (~150A) it would likely be ok. Its running it a bit hard, but I would think they would be ok. Perhaps someone with direct exp can chime in. If possible, I would go with a slightly larger batt (like a 4900) to give some more headroom and runtime tho.

Thanks guys. Bear in mind this is powering a 90mm ducted fan, not a MT. I know the XL's can draw tons of current on take-off in a MT but a fan rotor weighs almost nothing. I suppose I'll have to buy a wattmeter and find out for sure. I have batteries that can supply enough power, they just don't fit in the vehicle. I bought some nice capacitors on eBay and I'm going to use one of them in there, too.