Hi,
I’ve been researching a 4s battery for the IRIS in order to gain more thrust and reduce throttle at altitude. I live and fly above 6000 feet and would like to take off and fly as high as 14k ASL, if that’s even possible (I’m guessing that we’re just as altitude limited as many single prop helicopters). The thinner air causes a higher throttle at hover depending on altitude.
NOTE: I’m not talking about flying more than a few hundred feet off the deck - AGL.
I’ve found a 4s battery that seems close to the max physical size I’ve seen diacussed, Kypom K6 4500mah 4s 35c.
The numbers I’ve plugged into ecalc are right on the edge max-power wise , I also wanted to check here in case anyone knows of any other reason that this battery would not be compatible with the IRIS (either electronically or physically) or has a better alternative battery before I spend the money. I have read that the tarot gimbal may need a UBEC in order to be fed 12 volts.
Look at the comments of this video: youtube.com/watch?v=6GLsfeovGFU
"Update: I am finding that using a 4S lipo (I tried a 4200mAh) a much better match if you want to do any more than just hover or cruise around. With a 3S you feel the weight of the quad."
If you give the 4S LiPo a try that you have linked, I’d be interested in finding out how it went.
Kanga,
that’s really awesome. But what does he mean that he’s using the px4 firmware, isn’t that the same code that runs on the Pixhawk? or is he using a different code base that we are not?
Thanks and I will certainly post to the forum if I decide to try this battery.
I honestly have no idea what he means with the firmware.
But I did remember quite a few people mentioning that they fly with 4S batteries. Even someone from 3DR confirmed that IRIS will work with 4S. Only the gimbal needs a voltage step-down board. Can’t recall where I read that though as I don’t have a gimbal and I’m not planning on getting one for IRIS.
[quote=“Tomas”]I am also not sure, if it will be necessary to use UBEC for Gimbal, if it will be powered from pixhawk. Am I right with that?[/quote] The gimbal is not powered from the Pixhawk, the gimbal gets its power from the battery, so in case you use a 4S battery you need to lower the voltage. Here you can find more information: copter.ardupilot.com/wiki/common … he_Pixhawk
[quote=“RogelioN”][quote=“Tomas”]I am also not sure, if it will be necessary to use UBEC for Gimbal, if it will be powered from pixhawk. Am I right with that?[/quote] The gimbal is not powered from the Pixhawk, the gimbal gets its power from the battery, so in case you use a 4S battery you need to lower the voltage. Here you can find more information: copter.ardupilot.com/wiki/common … he_Pixhawk[/quote]
Thanks, after some digging around I figure it out…
Let us know how it goes with that battery!
I’m especially interested in finding out if it fits with the 27mm height. The Lipo I’m using is 25mm in height and has a snug fit. But it would be really cool if it would fit.
