HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Sep 19, 2010, 01:16 PM
Registered User
Snohomish, WA
Joined Oct 2009
110 Posts
Discussion
EZ Star cooking my ESC

I have modified my EZ Star as a waterplane (see Epic Fail... in Waterplanes if interested). It has an inrunner Hyperion motor, 25A Atlas ESC, 6x4 APC, and uses Hyperion's CX 2100 mAh 3s. My concern is that the ESC gets really hot. Takeoffs are a full throttle affair and take me several attempts. After a few minutes of flight, I notice a significant drop in power and immediately bring it down. That's when the ESC is hot.

I measured the electrical parameters with my Watts Up meter and got the following:
servo 1; 0.23A 2.5W (moving it quickly)
servo 2; 0.25A 3.0W (same)
motor; 20.5A 244W (full throttle, 5 sec)
everything stopped, 0.05A 0.7W

Anything stand out as a problem? I don't see anything, but I'm still early in the learning curve. If everything is nominal, then the likely culprit seems to me that all the electrical gear in packed into what amounts to a very well insulated compartment and normal heat generation is building up. If that's right, I think a heat sink stuck on the ESC and exposed to the exterior should resolve the problem. That's if something else isn't at play here, hence the post.

Thoughts?

Jeff
Democritus is offline Find More Posts by Democritus
Reply With Quote
Sign up now
to remove ads between posts
Old Sep 19, 2010, 01:44 PM
Clyde, Ca. USA
Clyde, Ca. USA
Joined May 2007
2,382 Posts
Is your ESC mounted outside or inside?
My ESC is mounted outside so it gets some wind cooling.
Here is what I am using. HXT2835 2700kv inrunner Hextronic 36 amp esc
It doesn't hurt to use an ESC larger then needed, it will stay cooler and more easily handle the amps needed by the motor.
You might post here as there are a million Easystar pilots and will have many answers.
http://www.rcgroups.com/forums/showthread.php?t=1167272
Well, maybe not a million but a lot.
john339 is offline Find More Posts by john339
Reply With Quote
Old Sep 19, 2010, 02:13 PM
Registered User
Snohomish, WA
Joined Oct 2009
110 Posts
I thought about posting to that thread, but the size of the thing made me think that a separate posting might be better. We'll see.

The ESC is mounted inside the canopy, as per instructions. That's why I didn't give overheating much thought, as these planes have been around so long that I assumed that just following the manual would be sufficient. I guess my modifications render that assumption void. I thought that a brushless motor, being more efficient than the stock brushed speed 400, would create less heat. However, if I'm pulling more watts than stock (it'd better be! That was the point in the waterplane mod), even if more efficient, more power can be more heat.

Jeff
Democritus is offline Find More Posts by Democritus
Reply With Quote
Old Sep 19, 2010, 09:10 PM
Shelter Kitty "Orange Death"
bartricky's Avatar
United States, FL, Monroe
Joined Jan 2008
3,153 Posts
This is my 20A ESC mounted externally. Never had a problem with it until it went down in a saltwater bay (pic2)...
bartricky is offline Find More Posts by bartricky
Reply With Quote
Old Sep 19, 2010, 09:19 PM
WARNING: May contain spam
Xpress..'s Avatar
Joined Oct 2007
20,918 Posts
Quote:
Originally Posted by Democritus View Post
I thought about posting to that thread, but the size of the thing made me think that a separate posting might be better. We'll see.

The ESC is mounted inside the canopy, as per instructions. That's why I didn't give overheating much thought, as these planes have been around so long that I assumed that just following the manual would be sufficient. I guess my modifications render that assumption void. I thought that a brushless motor, being more efficient than the stock brushed speed 400, would create less heat. However, if I'm pulling more watts than stock (it'd better be! That was the point in the waterplane mod), even if more efficient, more power can be more heat.

Jeff
The Easy Star, while a fantastic airframe, needs to have a nice cooling hole cut up front in order to cool down the electronics. If yours is a seaplane, then you need to mount it ontop of the power pop, like in the above pictures, and wipe it off after flight. Lack of cooling with anything will cause heating problems.
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Sep 19, 2010, 09:26 PM
E-Gliders
outngo's Avatar
South Carolina
Joined May 2009
1,305 Posts
@ bart those hc 2200kvs are good motors, have one in another plane.
outngo is offline Find More Posts by outngo
Reply With Quote
Old Sep 25, 2010, 02:11 AM
Registered User
Jurgen Heilig's Avatar
53859 Niederkassel, Germany
Joined Sep 2000
18,757 Posts
Quote:
Originally Posted by Xpress.. View Post
The Easy Star, while a fantastic airframe, needs to have a nice cooling hole cut up front in order to cool down the electronics.
...
If you use suitable equipment, there is no need for cooling holes on a model like the EasyStar - not even during "NiCd days".

Jürgen
Jurgen Heilig is offline Find More Posts by Jurgen Heilig
RCG Plus Member
Latest blog entry: InterModellBau 2014
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion EZ Star ESC Specs John Hudak Foamies (Kits) 3 Jan 04, 2010 12:23 AM
Wanted Brushless Inrunner for my EZ Star hongrn Aircraft - Electric - Power Systems (FS/W) 1 Dec 09, 2009 09:04 PM
Sold New FPV Setup for EZ Star. 900Mhz 500mw. Dual Output Video. KX191 cam. EZ Pod. Batts. LESLIEx317537 Aircraft - General - Miscellaneous (FS/W) 9 May 13, 2009 12:05 AM
Sold EZ Star-ARC 28-37-3 Suppo 40a ESc Hitec 55 & 81's ALL NEW sparx22 Aircraft - Electric - Airplanes (FS/W) 11 Apr 07, 2008 12:32 PM
Discussion Question about my EZ Star setup... lovespicyfood Power Systems 3 Jun 21, 2006 03:31 PM