Kosmik Capacity Limit - Great Feature

[im4711]

great feature - hard to not notice it.

[jamin_00]

I have mine set to 4.0 (4000mah) and it always comes in at 18-22% left.

Its bloody accurate and you really do not have to stick to 20%

[rossk]

I let mine run after it kicked in on the E820, had everyone at the field amazed by how low the HS can go before it cant hover any more, would have been less than 500 rpm for sure, still finished @ 17%

And for those doubting the accuracy of JLog2.5, doesn't it just read the kosmik values and pass them on, so really it cant be any less accurate than the kosmik itself, since they are the same thing.

[im4711]

Yep - since JLog 2.5 gets the data from the Kosmik as well as from Jive ... the reading is very accurate. I fly based on mAh used for a few weeks now and have to say its really cool since I now do not accidentally fly my batteries down.

[Luisito]

The capacity limit as the video shows is an awesome feature. Throw in the JLog 2.5 combination, makes it even greater.

I'm about to place the JLog on that 770 in the video. Nice to know ahead of time before you are literally inches from the ground inverted

[wblombard]

Originally Posted by Luisito

The capacity limit as the video shows is an awesome feature. Throw in the JLog 2.5 combination, makes it even greater.

I'm about to place the JLog on that 770 in the video. Nice to know ahead of time before you are literally inches from the ground inverted

My voltage slow down is set at default 3V, should i change that as welll? Not sure what V would be at 25%

[Wh1teAfr1can]

Originally Posted by wblombard

My voltage slow down is set at default 3V, should i change that as welll? Not sure what V would be at 25%

no 3v is way below the voltage at the 20% cutoff. if your packs are hitting 3V before capacity limit has gone off it is time to throw them away.

[wblombard]

Originally Posted by Wh1teAfr1can

no 3v is way below the voltage at the 20% cutoff. if your packs are hitting 3V before capacity limit has gone off it is time to throw them away.

Thanks Richard.

My voltage after a flight 3200mah stated 44.9V therefore 3,75V per cel...going to up my capacity limit to 3600mah to come in and land at circa 3800mah. I'm using 5000mah packs. I just hope this is safe for the batteries and that I'm not going to reduce their life time doing this.

[helicraze]

It will be fine!

Good feature, when my timer goes off i fly closer so when it hits i can land quickly

[Luisito]

+1

I use my timer just as a reminder to get ready for the capacity limit to slow down the RPM. Since I like flying low RPM also, I'll do that towards the beginning of the flight since it may not be so noticeable when it kicks in if you are flying away from you. Plus you may not want to be doing low inverted flights low to the ground either.

It's very accurate....

[rebeltrousers]

Tried it for the first time today. I think having your timer as a warning is essential especially if you're flying in the wind at a distance. I do think capacity limit really is a fantastic feature, I don't think I'll ever turn it off now!

I'm using a range of 5000-5200 packs and I set to 3AH and came down with the following voltages on the log. Of course these went up quite a bit when the packs had time to cool:
45.0v (my sh#ttest packs)
45.25v
45.25v
45.4v

Could I get away with much more flight time? These were all 5mins approx.

[Primal]

Bump it up to 3.5 and try again. Mine is set to 3.6 and I come done with plenty to spare

[jamin_00]

Yes, you got loads to go if your only using 3000mah out of 5000. Put it to 4000 and enjoy it

[Seasick78]

Originally Posted by jamin_00

Yes, you got loads to go if your only using 3000mah out of 5000. Put it to 4000 and enjoy it

+1

I also use 4000 as a cutoff point with 5000 and above packs.

[GimpyGolden]

Though Cap Cut is a great feature I do have one gripe with it.
I like to do a nice high auto at the end of my flights and I always feel I'm taken as I have already lost head speed due to the cut off.

If I am way up when it cut's no biggie but if I am down low and need to climb for the auto I've already lost so much I am nervous to then perform the auto.
It would be nice if you could cancel the slow down once you've detected it.
Maybe a quick flip in and out of hold to "reset" to full head speed then at least you are beginning an auto with all you've got.

It's possible the Kos already does this as I haven't tried. Maybe you reps can pass it up the line as a suggestion to 'K' and see if it can be implemented in a future update.

[Luisito]

Please share your experiences using the capacity limit and telemetry. I'm curious how it's working either using Kontronik Teleme or JLog....

[Seasick78]

Originally Posted by Luisito

Please share your experiences using the capacity limit and telemetry. I'm curious how it's working either using Kontronik Teleme or JLog....

I use JLog with all of my ESC's and pipe the telemetry to a Jeti DS-16. With the Kosmik I set the capacitance cutoff slightly above where I want to land. I use the telemetry alarms as my primary indication of when to land. There are a few alerts setup so it's never a surprise, and they are audible so I don't have to state at the screen. If I ignore the alerts/alarms, then the capacitance cutoff in the Kosmik will kick in with enough time to prevent killing my packs. I do not rely on the Kosmik to know when to land though... I prefer to be at full power when I come in to land rather than partial power due to cutoff.

The accuracy of the telemetry vs Kosmik vs what I put back into the packs after a flight has been extremely accurate.

The nice thing about this approach with telemetry is that there is no need to rely on any sort of timer at all; and no surprise cut in power due to throttle slowdown. This is good with any change in rpm during a flight, weather cruising along with sport flying, or hard flying (or both during a single flight... i.e. variable loads on your motor/batteries).

Hope that helps.

[RyanW]

Originally Posted by GimpyGolden

Though Cap Cut is a great feature I do have one gripe with it.
I like to do a nice high auto at the end of my flights and I always feel I'm taken as I have already lost head speed due to the cut off.

Scott- I am in the same boat. I found that when you land, after the capacity cut feature is activated, it will do a 'short reset' for a bit and you have your headspeed back temporarily. I don't know how long this is exactly, but I can usually climb out to auto again. When you lower the throttle (throttle hold) it seems like it pauses the ramp down of the head speed. It has been a while since I tested this, but I remember having a little head speed (not 100%) after hitting throttle hold.

The machine I did this with has gone to a new home and the next Kosmik machine should be up and going within a week or two so I can test this again.

I will keep you updated.

[rebeltrousers]

Still set at 3000 and when the batteries have gotten back to ambient temperature they read about 30% on my monitor which is is about 22.75v.
In the logging they sometimes read a little below 22.2v under load but as soon as I hit hold they go back up to 22.6 or something. Is it unsafe for their voltage to be allowed to go below 22.2 under load?

[rebeltrousers]

To be more exact about low voltage etc:
20v under very light hovering load
21v tiny downward peak on climbout