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MS Composit › Himax motor won't spool up smoothly with Phoenix 10
02-13-2006 12:08 AM  12 years agoPost 1
awangofo2

rrNovice

Shropshire, UK

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Hi all,

This is my first ever post on RunRyder so please bear with me.
I've searched for ages for some help with this so I'm hoping a Hornet expert with much more experience than me can help.

My Hornet CP-X flies pretty well now after months and months of tinkering, damage, crashes and finally learning to fly it.
I'm running a Himax/Himark 2015/4100 with a Phoenix 10 ESC in Fixed Throttle setting and 11.1v 1300mah Lipos.
My problem is that the motor won't spool up smoothly.
From 0 to 35% stick it stutters and tries to rotate in both directions before finally leaping violently into life at high RPM.
Once it is going I can drop the motor speed to very slow and it picks up again just fine. I've yet to stip a pinion, but this can't be doing any good and it makes the tail very difficult to control on the ground.
Does anyone else have experience of this sort of thing?
I know that in Governor Mode there is a Slow Spool Up setting, but I understand from other posts that this isn't ideal for the Hornet.

Any thoughts on this would be very much appreciated.

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02-13-2006 01:25 AM  12 years agoPost 2
Gary Jenkins

rrElite Veteran

Nowhere, US

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What pinion are you using? Use a 10, 11 or 12 not the 13.

Phoenix 10 Settings:
Cutoff Voltage - 4.V
Current limit - Disble
Brake - Disable
Throttle - Fixed
Timing - Standard
Cutoff type - Hard
Soft Start - Soft start

One other this is the gear mesh tight?

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02-13-2006 08:54 AM  12 years agoPost 3
awangofo2

rrNovice

Shropshire, UK

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Hello Gary, thanks for the reply.

I'm using a 12 tooth pinion and the gear mesh is not too tight. Everything in the gear train is smooth.

My ESC setup is like you say except:

The cut-off type is set to Soft - so as the heli doesn't suddenly drop from the sky if the battery is low!
The Soft Start is programmed in, but I didn't think it worked in Fixed Throtle mode.

Cheers for your help.

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02-13-2006 11:16 PM  12 years agoPost 4
Gary Jenkins

rrElite Veteran

Nowhere, US

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My Himax starts up smoothly so I can only conclude it's a motor or esc problem.

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02-14-2006 12:14 AM  12 years agoPost 5
heli_madken

rrApprentice

Liverpool, England

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Hi, did you cut off the original connectors and solder the joints to the motor wires? the problem you have sounds like poor connectivity, himax motors have a clear varnish on the wires that needs to be burnt off with a 50 watt or higher soldering iron, leave the iron in place for a while to burn it off. Ideally the original connectors should no be cut off, just a hunch

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02-14-2006 10:49 AM  12 years agoPost 6
awangofo2

rrNovice

Shropshire, UK

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Thanks for the idea heli_madken,

No I haven't cut or soldered the connectors.
But I have just tried Governor Mode (low rpm) as suggested to me by someone in the Hornet-Heli forum. It seems to work pretty well, although there is still a back and forth movement from the motor as it begins to spool up. The pinion kind of moves back and forth in a nervous twitch until it seemingly gets enough power to twist in the correct direction. After that all is well.

Could it simply be that small brushless motors require a fair bit of current to get moving and overcome the inertia of the blades etc?

Cheers for your time.

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02-14-2006 12:32 PM  12 years agoPost 7
heli_madken

rrApprentice

Liverpool, England

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If it is only a momentary thing (thought it was something more) then that is normal behaviour for the Pheonix range of ESC's, its part of the soft startup routine although for the life of me I cant see how it helps

Cheers

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