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Feb 12, 2010, 07:07 PM
Boom goes the dynamite!
verticalflight's Avatar
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7000 watt club


From a flight this morning, on the B08
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Feb 12, 2010, 11:04 PM
Registered User
grobbins666's Avatar
Nice Kris, what were you running?
Last edited by grobbins666; Feb 13, 2010 at 12:19 AM.
Feb 13, 2010, 12:06 AM
Needs to do 52 legs !!
jjmouris's Avatar
Kris, welcome to the club.

Would not risk a B08 tho.

Joe
Feb 13, 2010, 01:27 AM
Boom goes the dynamite!
verticalflight's Avatar
grobbins - 1511 1.5D with 6.7 gb, on 6s with CC180, and Sergey prop 17.7x22 Banana, lipos heated to 90 degrees pre-flight

Joe already thinks I am a nutter!
Feb 13, 2010, 01:50 AM
Registered User
grobbins666's Avatar
Sweetness, I just ran a 1512 1d 5s and a gm 16*18 today and is was crazy Can't imagine another 1-1.5k
Where can I get that prop if possible? Sounds like you might have hit 200mph
Feb 13, 2010, 03:31 AM
Registered User
epwierman's Avatar
Dude, slow down.... You keep this up and I'll be adding a drag chute to your plane as well!
Feb 13, 2010, 04:23 AM
The props of tomorrow
Grob , check the eflight site after a week , and you will see there the new GM 17x19,5-21",
and the swiss 15x15 prop.
Feb 13, 2010, 10:34 AM
Cumulus Altimus
FASTBEN's Avatar
wow,that is some crazzzzzyyyy power VF....cant Imagen the sound of that motor/prop.
ben
Feb 13, 2010, 11:11 AM
Needs to do 52 legs !!
jjmouris's Avatar
Note, good battery's those Turnigy's. Aren't they.

Feb 13, 2010, 11:25 AM
The Kid
Thekid3418's Avatar
2.84V/cell? Presumably 3000mah (maybe 2650?)? Thats a WHOLE LOTTA C's!!!
Feb 13, 2010, 11:34 AM
Boom goes the dynamite!
verticalflight's Avatar
Indeed, here is climb 5
Feb 13, 2010, 12:26 PM
Needs to do 52 legs !!
jjmouris's Avatar
No, the 2650mah packs don't take the F5B loads. Or atleast not reliably.

If any one of you is going to use Turnigy's, please do check the soldering is done well. So remove the plastic at the front and check the PCB out. That there is plenty of tab area soldered on there as well. Sometimes they don't press the PCB down far enough before they solder it up.

Anyway, back to the subject.

Kris, i am very happy for you and fully understand the amount of fun you are having. Been there.

However, i am very worried for your P180. I know you have had a great track record so far on 6S but i am 110% sure it is just a matter of time. When i had my last P180 burn half a bridge worth of fets, i took the logic board off and ran some tests on it. The SO8 regulator got to +90 degrees C without even running the motor. When i put the logic board upside down so that the heat was accumulating rather then rising up into the air, it would shut down every few minutes for a split second. If one of those shut downs coincides with a motor run, you've had it. Infact, i managed to do this even on 5S with a little added heat. Something you might get from say running the motor. However i realise that if you run the motor normally, the plane is flying and the ESC should get some air cooling. This might explain why the 5S setups have been relatively safe to use as the margin is just the much bigger.

In other words, the stock P45/80/125/180 logic board is not 100% reliable on 6S. It seems much more suited to 2-4S with all the linear regulators on it.

For this reason i am switching to the ICE 200 lite for 6S provided it's fets can take the strain. So far it seems OK as i measured the fet temperature and it didn't get above 45 degrees C even when blasting through the full 1750W.min in 3 minutes. I get higher temps on the P180. Then again it's got a lot of copper strips soaking up the heat instantly and the fets could be working harder internally as there is less of them. My old P180 and P125 controllers will have a modification to reduce the logic board heat production. Either my own 2S balance tap solution (has flown) or George's latest componant swap mod. There is still a lot of testing to do on this but George has already modified and flown 3 of his P125's so it seems he is pritty sure of it.

You can test all of this your self. Just take the setup out the plane, connect it all up (without prop for safety reasons) and wait a few minutes. Then touch the top of the logic board and you will burn your self on a few of the componants if running 6S. The worst being the SO8 (chip with 2x4 legs). Measure it with a temp gun. Note, the controller has to be armed, this is when it produces more heat. You could even measure the output of the SO8, when it shuts down with the motor not running, nothing happens and there is no other sign this is going on. Note, some logic boards are better then others. Meaning some get slightly less hot and some might not shut down untill they get a little hotter. Again, we are talking (small) safety margins.

I have been in contact with Bernie and hope he will take this matter seriously as there have been to many unneccacery controller fires already.

I was going to e-mail you in private but i feel the time has come to get this information out in the open. As atleast when people know there is a problem they then have the option to do something about it.

Take care,

Joe
Feb 13, 2010, 01:01 PM
The props of tomorrow
Joe what max wattage the ICE 200 been pushed ?
Feb 13, 2010, 01:13 PM
inactive
7kW:
http://www.powercroco.de/12N10P4025speedscorpion.html


10kW:


>12kW:
comming soon.
we are still waiting for the 14S 320A yge controller.

15kW:
just in building. using a 4530 outrunner with>6mm^2 into the winding.
Feb 13, 2010, 01:21 PM
Needs to do 52 legs !!
jjmouris's Avatar
Georgi, ask Steve Neu. He has flown it much more then me.

Here is a few shots of my P125 in transformation, just one side of it.

This is not the type of stuff that anyone can do. As such my recommendation is to use P180 up to 4S and ICE 200 lite for 6S. An overlapping at 5S where both controllers could be used.

5v regulator replaced by a 12v version and voltage doubler removed. This saves half the heat build up in the SO8 on the top side of the PCB.
Last edited by jjmouris; Feb 13, 2010 at 01:59 PM.


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