Kosmik 160 shutdown

[mahbouni]

OK guys now you got me worried. Already have a Kosmik 200HV and it has been fine in my E7 with 4525-520 Ultimate, 2300rpm on the head. Spikes of 217A and not a single issue.

But this afternoon I just ordered a Logo 700 with Pyro 800-48L.

https://www.helifreak.com/showthread.php?t=494091

Have I made a big mistake and should I have ordered a 4530 instead? They may not have shipped it yet so I might be able to change it?

[mahbouni]

Just called www.fast-lad.co.uk and they have shipped it already

[NTM]

Mine was fine on 713mm blades, it was when I started really flogging it on 753mm that troubles arose.
So if you're planning to stay on 713mm, you'll likely be fine.
I was probably pushing the motor past it's capability, which caused the rapid peaks.
The pyro/kosmik will be fine on your 713's... highest I could make it peak was 160 amps on the 14s setup.

[mahbouni]

Was your motor hot when the Kosmik shut down? What head speed did you have on 713 and how hard do you fly?

[NTM]

Motor was just warm when the kosmik shut down. It was cold out though.
I tried between 2000 and 2150 on 713's. It has a high tail ratio, past 2150 the tail sounds like it's screaming.
I flew it hard on 713's, loaded it as much as possible just to see what the power system was drawing, being my first 14s setup and all
You'll have to just try it and see if you like it on 713's... some people are happy with it.

[talbot]

Is this shutdown thing a problem with all kosmiks or just a select few?

cheers

[jamin_00]

about 4 or 5 so far so I would say a select few

[andersn]

we are running 12, 14 and misc motors, up to 4530, on now 8? kosmiks in total, will let you know if we have any more shutdowns, we log all flights.

up for test is

pyro 800, 4035, 4525 YY/D, 4530-450YY, 4535-400-550KV, 5035 D-YY 4540 (scared of this) and pyro750/850 when they come in heliversions/shafts


this is all 12s flights/tests
allready tested with good result is
stock 750mx
stock HK-3 4035-560
stock 4530-500LE YY 1.5mm
stock 4530-540LE YY 1.5mm

tested with MEeeHHHEHH result, 750mx YY 1.6mm wind, needs fixed timeing.

[jamin_00]

Add a 4535-550LE to that list as thats what Im running too with many speed flights pulling 230a

[Mercuriell]

NTM - would you mind attaching the .lov file or dat file of the whole flight with shutdown? - you can attach as a .zip - I'd like to go over it with Logview !

[Stolla]

Originally Posted by mahbouni

Just called www.fast-lad.co.uk and they have shipped it already

I would run it and see how it goes, if you have problems pull the bell off the motor and if you see damaged wires flad will take it back for sure.
Im running 800 stock on much lighter banshee without problem but keep in mind ntm spiked 240 amps on occasion, whether it be just his flying or perhaps internally damaged wire on the same group cant say but flying hard on 713 and pyro 850 on 14 s mine peaks at 180 amp. the jury is still out to see whether kosmik 160 will deal with any motor from tailslides with full collective stops, espescially longer blades, somehow i have my doubts although the 200 amp kosmik should be ok.

[mahbouni]

Originally Posted by Stolla

I would run it and see how it goes, if you have problems pull the bell off the motor and if you see damaged wires flad will take it back for sure.
Im running 800 stock on much lighter banshee without problem but keep in mind ntm spiked 240 amps on occasion, whether it be just his flying or perhaps internally damaged wire on the same group cant say but flying hard on 713 and pyro 850 on 14 s mine peaks at 180 amp. the jury is still out to see whether kosmik 160 will deal with any motor from tailslides with full collective stops, espescially longer blades, somehow i have my doubts although the 200 amp kosmik should be ok.

Yeah I think I will just give it a try. 240A isn't that much though. My Kosmik 200 logs show spikes up to 217A. and that's in a lighter machine. A Synergy E7 with a 4525-520 Ultimate and Rail 696 mains @ 2300rpm.

[Stolla]

Depends whether 12 or 14 s, current draw much lower on 14 s, also larger motors lower peaks. Ive peaked over 220 on jive and 4035 12 s, that same motor will peak much higher in l700 due to xtra weight and will have less power than rewind pyro 850 that peaks at 180.
In the end its easy to shut down almost any esc if the pilot is very agressive on collective though, i believe for instance spikes of over 500 is nothing on a 4530 measured with the right equipment. Makes you think twice doesnt it?

[mahbouni]

Originally Posted by Stolla

Depends whether 12 or 14 s, current draw much lower on 14 s, also larger motors lower peaks. Ive peaked over 220 on jive and 4035 12 s, that same motor will peak much higher in l700 due to xtra weight and will have less power than rewind pyro 850 that peaks at 180.

E7 was 12s 5000mAh but my Logo 700 will be 14s 4500mAh.

Originally Posted by Stolla

In the end its easy to shut down almost any esc if the pilot is very agressive on collective though, i believe for instance spikes of over 500 is nothing on a 4530 measured with the right equipment. Makes you think twice doesnt it?

Yes it does

[andersn]

You dont buy a 200A 14s $900 esc with $133 prog card, to be careful with the collective.

[mahbouni]

Originally Posted by andersn

You dont buy a 200A 14s $900 esc with $133 prog card, to be careful with the collective.

This is also true

[Stolla]

Ok but dont you think its unwise to expect 240 current spikes from a 160 amp esc? Thing is we were spoiled with the jive performing well over spec, now expect same from kosmik, but still a shutdown at 240 for a 160 esc is well within spec doesnt matter the cost.
Perhaps the yge 320 is a better bet for crazy fingers

[mahbouni]

To be honest the whole idea of 500A going through a system is scary. Perhaps we need another revolutionary breakthrough in science

[NTM]

240 amps is almost nothing for the kosmik 160.
I have it on good authority that the kosmik's have even more headroom built into them than the jive's.
The shutdown at 240 amps that I experienced had nothing to do with the height of the peak, but rather how quickly it happened.
If I had to guess, the kosmik is shutting itself down because it thinks it's seeing a motor failure.

[mahbouni]

Originally Posted by NTM

If I had to guess, the kosmik is shutting itself down because it thinks it's seeing a motor failure.

So do you think the motor is failing or has the Kosmik just got its nickers in a twist? From my perspective, motors are limited by only 2 things; too much heat and/or too much rpm.