RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 466 views
Helicopter
e-
Electric Motors-Controllers-ESC
Other › Humidity and motor temps
01-11-2011 09:31 AM  7 years agoPost 1
helicraze

rrElite Veteran

Victoria - Australia

My Posts: All  Forum  Topic

I am wondering if anyone has any experience, for the first time in a while it was 30degC and very humid, i noticed all my motor and esc temps were right up there, the powerjazz fan was running at end of flight and the motor upto 70deg.

Even had the jive 120HV shutdown!

Is it correct that humidity creates cooling problems for motors etc? I am not an expert in thermodynamics

PM  EMAIL  GALLERY  Attn:RR  Quote
01-11-2011 11:51 AM  7 years agoPost 2
MrMel

rrProfessor

Gotland

My Posts: All  Forum  Topic

Without datalogging its hard to say for sure what causing it, for same the IR in the packs could have changed so your running higher headspeeds, pulling more etc.

Here in sweden we have basically to gear down one tooth in the summer compared to flying in winter, thats how much temp affects packs even if they are preheated in the winter.

Humidity affect air density, so it probably play some role in the cooling, but how much compared to other is the question.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

PM  EMAIL  GALLERY  Attn:RR  Quote
01-11-2011 01:36 PM  7 years agoPost 3
Zbawer

rrApprentice

Singapore

My Posts: All  Forum  Topic

Summer in Shanghai is about 35 Celsius and 80-90% humidity.
My 450s ESC (one Scorpion 50 amp and one CC 45 Amp running one 3s) are getting really hot after 3 min flight, i can't leave my finger on them more than 5 sec ; got to wait 5 minutes to cool down and go for another flight.
But still, nevershut down ...

PM  EMAIL  GALLERY  Attn:RR  Quote
01-11-2011 08:47 PM  7 years agoPost 4
helicraze

rrElite Veteran

Victoria - Australia

My Posts: All  Forum  Topic

I run mode 11 so same RPM.

Strange, i only wonder cause i replaced the actro bearings and wonder if its something wrong, the bearings are henseleit for the grips but same size as the actro motor so i used them.

The 4525LE, i used loctite retainer on the counterbearing to keep the shaft down, so yeh not sure if its what i did or the humidity that caused temp increase

PM  EMAIL  GALLERY  Attn:RR  Quote
01-11-2011 08:51 PM  7 years agoPost 5
MrMel

rrProfessor

Gotland

My Posts: All  Forum  Topic

Even if RPM is the same, when pack IR is less current will flow more easy, motor can pull more, ESC wont complain your normal limiter is the pack.

That's why it's actually "bad" in some setups with too high C packs, you will get shutdowns on the esc (or burn them up if you do not have protected escs)

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 466 views
Helicopter
e-
Electric Motors-Controllers-ESC
Other › Humidity and motor temps
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Wednesday, January 17 - 3:01 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online