RC Qatar RC

Welcome, Guest. Please login or register.
Did you miss your activation email?
July 17, 2019, 01:27:08 PM

Login with username, password and session length
Pages: [1]   Go Down
Author Topic: Scorpion Commander 45A ESC heat problem - SOLVED  (Read 5863 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline

Posts: 521

« on: October 26, 2008, 11:45:18 AM »

Since I got my Scorpion HK2221-08v2 motor and the Scorpion Commander 45A ESC that went with it, I have run into this issue where the ESC seemed to cut-off after a minute or two of pitch pumping 3D moves (like tic-tocs).  The ESC puts the motor on very low rpm (not a full cut-off though) for like couple of seconds, after that the headspeed recovers.  The ESC was very hot.  I crashed once (mild crash), and was able to recover safely in two other occassions.

I had noticed that it is recommended that the ESC be fixed outside the canopy, which is how I had done it initially itself.  So I contacted Innov8tive Designs (the distributor of Scorpion in the US), and Luciene Miller responded.  I was wondering if the 13T pinion was the problem.  But Luciene confirmed that 13T is fine on this setup.  Instead, I was asked to check if there was at least some airflow on the back-side of the ESC (the side without the heat-sink).  Sure enough, I had put a big strip of double-sided tape there, and there was no airflow.  So I removed the double sided tape, and just attached the ESC with two small strips velcro on two ends of the ESC, and secured the whole thing with another long velcro strap to the frame.

I have been able to do full packs worth of 3D after this change.  Thank you Luciene for the tip, that the backside of the ESC contains the BEC voltage regulator chips which generate a lot of heat. 
« Last Edit: October 29, 2008, 11:07:08 AM by anwar » Logged

Offline Offline

Posts: 44

« Reply #1 on: October 28, 2008, 08:35:25 PM »

Thanks anwar for this info Clap  I think we should apply the same with other ESCs.

Offline Offline

Posts: 521

« Reply #2 on: October 29, 2008, 12:05:16 PM »

Here are couple of pictures, to show the gap between the frame and the back side of the ESC.

* esc_mount.JPG (104.59 KB, 768x576 - viewed 2065 times.)

* esc_mount_gap.JPG (102.5 KB, 768x576 - viewed 2039 times.)

Offline Offline

Posts: 15

« Reply #3 on: January 26, 2014, 04:38:44 PM »

Curiosity: What was your throttle curve when getting too hot?

Not at idle 2 but during the flights that was getting too hot

With a 13 pinion, an low throttle curve will boil it

MFA Sport 500... fixed pitch, no gyro, no simulators, no internet.  Just nitro, wooden blades and two screwdrivers to bend the bladeholders to adjust the pitch.... more adrenaline than flying a real helicopter...
Pages: [1]   Go Up
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder

2008-2011 (c) RC Qatar
Valid XHTML 1.0! Valid CSS!