Help - CC Ice 75 - new guy needs help
The new guy is trying his best to build a plane with quality components. Yes I am guilty of pruchasing a lot of my stuff from China (plush speed controller and turnigy motors) and this plane...well I want to do the best quality my budget could afford.
So right or worng my research ended with me purchasing a Castle Creations ICE75, Castle Creations ccBEC,Scorpoin S-3032-12, and 4000mA 4S1P Nano tech batteries.
What I'm experiencing is with the prop on (not noticed without the prop) I'm getting studder right at zero speed. Sometimes this studder is more noticable than others. Sometimes you can just hear it. Other times you can see the prop turn 1/4 turn the wrong way, or bobble back and forth a couple of times, before it turns around and runs in the right direction.
I checked all motor lead connections both visually and with a fluke 87. I see could see no measurable risistance or voltage drop across the bullet connectors but I resoldered just for grins and sill no measureable risitance or voltage drop across the bullet connectors. But it still does it.
I have tried every possible motor connection combination that produces proper rotation direction and it does it with all combination. I logged on the the ICE75 and reversed direction in it and then tried all motor lead combinations again and I still get it.
Heck, it happened even when running the wrong direction.
Here are my ICE settings and results.
I have throttle settings in ICE75 set for airplane, auto endpoint detection with medium throttle response
I have Brake disabled
I have cutoff set for auto lipo, 3.2 volts per cell, soft cutoff.
I've tried low, medium, and high motor start power and noticed no difference, left it at medium.
I have not played with PWM frequency but castle creations recommended 8kHz and that is what I have it set on.
I've tried low, normal, and high timing and noticed no change in the studder so I left it at normal.
I am prepared to just live with it. I only notice it when coming off zero speed and I'm not sure if that would affect flying performance or not.
It is just sort of a bummer because my Plush ESC and Turnegy motor runs like a sewing machine and my expectation was this "better" equipment ... well I was not anticipating this problem (if in fact it is a problem).
I'm hoping there is someone out there with Castle creations ICE experience that may be able to offer some advice or a possible solution short of buying a Hacker motor :D
Thanks in advance to any and all that take the time to read and possibly responde.
Try outrunner mode on the Speed Control and see if that helps. Also that is what was known as Scorpion Screech and there is a very good explanation of that here:
P.S. BTW I have a few Scorpions that do it every once in a while and none do it once the planes are in the air.
Reading the spec on the scorpion motor it really does sound like I made a good purchase. I did see some post about bearing periodic maintenance (lube) that I didn't see for other motors but after all my reading I wasn't sure this maintenance is a requirement or just...well...some of the stuff you read on the internet.
And I think the ICE 75 is a good purchase based on what I could read about it.
I'll try outrunner mode and see how that does and not worry about it much if it doesn't clear up. Seems to be while in the air even if I did go to zero speed the windmill effect will keep the prop turning such that I may never notice it during flight.
Also thanks for the link. Interesting reading. But after reading it I'm suprised that playing with the ICE75 starting power setting didn't help. It is my understanding that this variable controls the amount of power sent to the motor when coming off zero speed. Having now read the post in the link you provided I picture as this variable would have delivered more power coming off zero speed to over come the magnets...but I must still be learning and not fully understanding.
Are you using a futaba transmitter?
If you are using a futaba try reversing the throttle on the transmitter.
Your settings look ok, but Id recomend you stick with low timing. Outrunner mode may help or it may not.
Are you running the newest firmware in the ICE? newer versions do start better.
Now to the key question - are you "sneaking up" on the throttle very slowly? That will often result in what you are seeing. Some motors just will not start or run smoothly at very low rpms and very low throttle settings.
If the motor starts ok when you just push on up to 1/4 throttle or so - even if there is a slight initial jerkiness - then I wouldnt worry too much about it.
A word of warning on Outrunner mode. Outrunner mode allows some motors to run waaaaaaaay beyond their max efficiency points. In other words, running outrunner mode may allow you to over load the motor well beyond where it would normally stop working. You could burn it up if its over proped.
My advice it to get and use a watt meter to be sure how many amps your system is pulling.
In most cases outrunner mode is perfectly safe. Its only if your setup is way over propped that you may have trouble.
Normally a motor will complain - screaching, loss of sync, poor starting and stuttering at full power - if its grossly over propped and your trying to push it way too hard.
Outrunner mode is a special mode castle came up with that allows the motor to keep running smoothly even when grossly over worked. So its a good idea to check before you run too much in outrunner mode.
Like I said - in most cases its not a worry and infact it makes many outrunners run a bit more efficiently and with a bit more power. But its best to be safe :)
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