Very cold weather and Wookong-M are not playing well... - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Electronics Support > DJI Heli Autopilot System(Naza-H/WooKong-H/Ace One)


DJI Heli Autopilot System(Naza-H/WooKong-H/Ace One) DJI Heli Autopilot System(Naza-H/WooKong-H/Ace One) Factory Support Forum


Reply
 
LinkBack Thread Tools Display Modes
Old 12-28-2012, 04:39 PM   #1 (permalink)
 
My HF Map location
Join Date: Jul 2011
Location: Quebec City, Canada
Default Very cold weather and Wookong-M are not playing well...

Had a crash happen yesterday.. Could not find the exact cause. The only reason I can figure is that the Wookong-M froze...

Let me recap:

It was roughly -15°C without windchill. Winds were calm.

I was flying around (for about 45 minutes or on my 3rd set of batteries if you prefer) and the wookong started feeling weird. When I banked in one direction, it wouldn't come back to full level. And same the other direction. So since the bird was far away (well, maybe 500') I started bringing it back. It came back fine, but started to bank right too much as it came back. I watched in horror as the H6 tilted all the way to the right to a point where the bird was upside down... I killed the motors as it hit the snow. Luckily it wasn't hard snow.. Broke all 6 props and one plate on my camera mount which I can probably redneck repair.

The motors were semi-hot after running 45 mins back to back so the snow melted on contact with it and got in the motors. The show then cooled the motor and it froze solid. The motors were stuck... I brought it straight home and blew compressed air all over everything to remove snow/water.

I still don't know exactly what happened, but my best guess is that the Wookong IMU froze....

Hint of advise: Don't fly below -10°C..........
Thalios is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-28-2012, 05:49 PM   #2 (permalink)
Registered Users
 
Posts: 1,864
 

Join Date: Jan 2011
Location: Arizona
Default

That happened to a buddy and his Naza when he left it sitting out on the pit-table for 30minutes around 35degrees before flying.

Sponge inside the Naza box was hard as a rock
__________________
Blade 450X & Blade mCPX BL
Spektrum AR7200BX
ProgressiveRC's "The Neutrino Ticket"
DesJardins is offline        Reply With Quote Quick reply to this message
Old 12-28-2012, 08:57 PM   #3 (permalink)
Registered Users
 
Posts: 1,574
 
My HF Map location
Join Date: Apr 2007
Location: Ellington, CT
Default

Wow sorry to hear that! I wonder if that is why it has an operation temp of -5 deg C.
__________________
Pulse XT 60 Saito 100
~KBDD Team Pilot~
rmalt is offline        Reply With Quote Quick reply to this message
Old 12-29-2012, 08:25 AM   #4 (permalink)
Registered Users
 

Join Date: Nov 2012
Location: Denmark
Default

Could it also be due to lipo voltage suddenly drops dratically due to the cold?
benchmark is offline        Reply With Quote Quick reply to this message
Old 12-29-2012, 08:32 AM   #5 (permalink)
Registered Users
 
Posts: 653
 

Join Date: Sep 2011
Location: México
Default

May be you got some moisture inside you MC it probably made it to fail.
__________________
FUSION 50 /CGY750
PROTOS 500 /SKOOKUM SK540BELT CP V2,CYPHER 3D
BIG NAZA QUADCOPTER
FLIP FPV
SAMUELPINONFLORES is offline        Reply With Quote Quick reply to this message
Old 12-29-2012, 10:11 AM   #6 (permalink)
Thread Starter Thread Starter
 
My HF Map location
Join Date: Jul 2011
Location: Quebec City, Canada
Default

Not lipo voltage as I have telemetry on it.

Really doubtful on moisture as I live in Quebec and it is fairly dry out here.
Thalios is offline        Reply With Quote Quick reply to this message
Old 12-31-2012, 01:15 PM   #7 (permalink)
Registered Users
 
Posts: 158
 

Join Date: Jul 2008
Location: Kansas City, MO
Default

Interesting, I would have though the micro controller itself would have generated enough heat to keep itself from crossing that threshold.

How do you keep your hands warm in that? I get by in 0 C weather by using heated glove liners, and that's pushing it sometimes.
__________________
APM 2x / TBS Frame / Trex 700e
1.2 GHz video / 900 MHz packet telemetry
oosnoopy is offline        Reply With Quote Quick reply to this message
Old 12-31-2012, 01:49 PM   #8 (permalink)
Thread Starter Thread Starter
 
My HF Map location
Join Date: Jul 2011
Location: Quebec City, Canada
Default

Using this mitt:

http://www.greathobbies.com/producti...rod_id=GHPMITT

Works great.
Thalios is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Insurance
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © VerticalScope Inc. All rights reserved.
 

SEO by vBSEO 3.6.1