SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Nov 18, 2012, 09:49 PM
20 years on the Internet
Nightstone's Avatar
United States, AZ, Phoenix
Joined May 2012
876 Posts
Discussion
HexTronik DT700 - Motor Madness

I scrapped my quad a few days ago after the kk2 board died from a few uses. So here I was with 4 DT700 motors. Decided to build a foamie and off we went to fly. Noticed right off the bat that the plane was way under powered. No way was I getting 900G of thrust.

Benched the motor. 9A at full throttle with a Gemfan 11x4.7. Should be around 13A. Went through timing cycles on the ESC. Nada. Grabbed different esc's. Results were kind of crazy. Anywhere from 9-14A depending on the esc. All the motors did the same with some variance. Amperage all over the place on the 5 different esc's I tested.

Some questions... Do some motors just not work well with certain speed controllers even with timings adjusted? Thats 347 grams less thrust. What is causing this issue?

Nightstone
Nightstone is offline Find More Posts by Nightstone
RCG Plus Member
Latest blog entry: Vibration and jello on planes
Reply With Quote
Sign up now
to remove ads between posts
Old Nov 19, 2012, 03:07 AM
Reduce the drama...
rick.benjamin's Avatar
USA, OR, Damascus
Joined Apr 2004
4,044 Posts
Battery?
rick.benjamin is offline Find More Posts by rick.benjamin
Reply With Quote
Old Nov 19, 2012, 04:10 PM
20 years on the Internet
Nightstone's Avatar
United States, AZ, Phoenix
Joined May 2012
876 Posts
Answering my own question... have spent hours researching this and came to the following conclusions.

From what I read there can be alot of variance from esc to esc. Not so much from the electronics but more from shoddy coding for the firmware.

That said... I guess I will be testing all my motors with various esc's as well as just doing amperage tests. I guess there is a reason I was getting more power out of that expensive Turnigy esc vs the cheapo's. But then again the one that was really under powered was a name brand also. Buy one test them and if they pass muster buy more.

I learn something new in this sport every day...

Nightstone
Nightstone is offline Find More Posts by Nightstone
RCG Plus Member
Latest blog entry: Vibration and jello on planes
Reply With Quote
Old Nov 22, 2012, 04:15 PM
Registered User
vintage1's Avatar
East Anglia, UK
Joined Sep 2002
29,703 Posts
Quote:
Originally Posted by Nightstone View Post
I scrapped my quad a few days ago after the kk2 board died from a few uses. So here I was with 4 DT700 motors. Decided to build a foamie and off we went to fly. Noticed right off the bat that the plane was way under powered. No way was I getting 900G of thrust.

Benched the motor. 9A at full throttle with a Gemfan 11x4.7. Should be around 13A. Went through timing cycles on the ESC. Nada. Grabbed different esc's. Results were kind of crazy. Anywhere from 9-14A depending on the esc. All the motors did the same with some variance. Amperage all over the place on the 5 different esc's I tested.

Some questions... Do some motors just not work well with certain speed controllers even with timings adjusted? Thats 347 grams less thrust. What is causing this issue?

Nightstone
Timing mostly.

Also occasionally high resistance FETS.
vintage1 is offline Find More Posts by vintage1
Reply With Quote
Old Nov 23, 2012, 03:01 AM
20 years on the Internet
Nightstone's Avatar
United States, AZ, Phoenix
Joined May 2012
876 Posts
Quote:
Originally Posted by vintage1 View Post
Timing mostly.

Also occasionally high resistance FETS.
Thanks!!! Thought for a while there I was loosing my mind... Got to love cheap equipment.

Nightstone
Nightstone is offline Find More Posts by Nightstone
RCG Plus Member
Latest blog entry: Vibration and jello on planes
Reply With Quote
Old Nov 23, 2012, 06:05 AM
Registered User
Joined Jun 2012
811 Posts
Quote:
Originally Posted by Nightstone View Post
Thanks!!! Thought for a while there I was loosing my mind... Got to love cheap equipment.

Nightstone
Do you know which ones drew high current and which ones drew low? Could be super handy info! =D
Nereth is offline Find More Posts by Nereth
Reply With Quote
Old Nov 23, 2012, 05:05 PM
Registered User
flydiver's Avatar
United States, WA, Seattle
Joined Jan 2007
5,264 Posts
Here's one other thread on comparing ESC performance.
http://www.rcgroups.com/forums/showthread.php?t=432140

In my own messing around I have found some notable differences in ESC to motor operation up to and including some incompatibilities where they simply would not work together when both the motor and ESC worked fine with other ones.
flydiver is online now Find More Posts by flydiver
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Two hexTronik DT700 Brushless Outrunner 700kv *NEW* nybeechpilot Aircraft - Electric - Multirotor (FS/W) 1 Sep 19, 2012 01:29 PM
Sold hexTronik DT700 Brushless Outrunners (x4) jimmyslaughter Aircraft - Electric - Power Systems (FS/W) 4 Jul 11, 2012 07:30 PM
Sold 4x Brand New DT700/6246 hexTronik DT700 Brushless Outrunner 700kv daign Aircraft - Electric - Multirotor (FS/W) 3 Sep 22, 2011 01:07 PM
Sold 2 NEW hexTronik DT700 Brushless Outrunner 700kv mattyhawk Aircraft - Electric - Power Systems (FS/W) 0 Jun 23, 2009 04:27 PM