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Old Oct 08, 2012, 07:27 AM
Tinkerer of makeshift failures
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Did anyone mention disk loading yet? I guess not :P
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Old Oct 08, 2012, 08:36 AM
buyer of the farm
United States, FL, DeLand
Joined Mar 2009
4,395 Posts
Quote:
Originally Posted by Darsh View Post
Did anyone mention disk loading yet? I guess not :P
Another factor that makes a larger prop turning more slowly not able to react to quick forces on the copter, making it less stable, or at least being knocked out of intended attitude longer than a vehicle with smaller props.

The crazy thing about turbulence, is that, unlike wind, it comes from unknown directions: any side the top or bottom. There's no way to trim for it. You can't see it to anticipate. The only possibility is to react to it. That makes speed the important factor, along with lots of reserve thrust available instantly from your prop/motor combination.

I think it's amazing that models fly as well as they do! The Ladybird would have been science fiction 10 years ago.
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Old Oct 08, 2012, 10:15 AM
KDS450QS(ZYX4),V977,CX-20
FyreSG's Avatar
United States, CA, Monterey
Joined Apr 2012
5,111 Posts
Batteries?

Are all the LB clones using the same type battery (TC702035U, 330mAh)? The two stock batteries for WLtoys V939 are of poor quality. The most important flaw is the lack of "punch" and it definitely does not have a capacity of 330mAh.

I just tested my Turnigy Nano-tech 250mAh 35-70C batteries. I am totally surprised at what my V939 can do! I had assumed the quad felt rather sedated because it was designed that way, then I tried the nanotechs. It felt like a totally different beast! It was extremely responsive and agile, and can fly noticebly faster. There is also an additional bonus of slightly longer flight time.

Has anyone tried other compatible batteries on the V939, other than the stock or nanotechs? Are they good?
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Old Oct 08, 2012, 10:29 AM
MassiveOverkill's Avatar
United States, FL, Melbourne
Joined Feb 2011
5,180 Posts
I've tested with 2 Turnigy Nanotech 130's (25C) in parallel and the difference is pronounced. I have Turnigy 300's on the way from Hobby King and I'm hoping the performance will be even greater.
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Old Oct 08, 2012, 10:44 AM
KDS450QS(ZYX4),V977,CX-20
FyreSG's Avatar
United States, CA, Monterey
Joined Apr 2012
5,111 Posts
I checked a few quads and they appear to come with different stock batteries.

U816:



Mini Pet:



V939:


X100:



I wonder if they offer the same level of performance, or amongst them there is a better one.
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Old Oct 08, 2012, 11:14 AM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
Joined Feb 2007
14,588 Posts
Micro quad OEM and Turnigy Nano-Tech lipo tests 101

WARNiNG!: Before you connect new lipos to your flight controller or lipo charger, be absolutely certain that the polarity is correct! Carefully swap the pins in the lipo connector if necessary to match your flight controller and charger connector. The Nine Eagles and Helimax version of lipos, for example, has reversed polarity from what most other micro and mini multicopters use.

Note 1:
Added Turnigy lipo tests and some cost info as of 12 Nov 2012. Added 600mah tests 14 November 2012. Added Turnigy Q-Bot OEM lipo test 15 March 2013.

Hi F,
I agree with that assessment. Either those V939 lipos are overrated, or end of shelf-life.

Test method and results with 7 OEM and 2 Turnigy Nano-Tech lipos:
-All lipos taken off the charger and measured at 4.2v
-All lipos had between 5-10 charge/discharge cycles before testing.
-All lipos were tested to have a 1min post flight resting 3.7v charge after full flight until the Ladybird LVC landing.
-All tests were gently flown, stationary hover indoors using the Walkera Ladybird V1 with telemetry set to off for the most flight time.

1. WLToys v939 330mah 10.2g(~$3.29ea x10 @Banggood) 5min
2. WLToys v939 330mah 10.2g 5min
3. Walkera Ladybird V1 240mah 8.0g(~$4.85ea x10 @Banggood) 9.0min
4. UDI U816 250mah or 240mah 8.1g(
~$2.40 ea x5) @Banggood) 9.5min
5. UDI U816 250mah or 240mah 8.1g 9.5min
6. MJX X100 300mah 8.1g(~$4.40ea x1 @Banggood) 7.5min
7. Mini Pet V997 300mah 8.1g(~
$2.20 price increase $2.40 ea x10 @Banggood) 7.5min
8. Turnigy Q-Bot 250mah 20c 7.9g (~$2.50ea @Banggood) 6.5min
9. Banggood 380mah 25c 10.5g (~$3.11ea for 5x $15.58 @Banggood) 10.0min

1. Turnigy Nano-Tech 300mah 45-90c 8.8g(~$2.44ea +ship @HK) 8.5min
2. Turnigy Nano-Tech 300mah 35-70c 8.4g(~$1.72ea +ship @HK) 6.5min

Note 2: The difference in the performance between the Nano-Techs was compared with the same lipos in a 10 lot purchase. The same results were noted. I find it odd that there is that much difference, but suspect that the 35-70c lipos are an older manufacture and suffer from a long shelf-life. Most "new" lipos will gain some flight time on the order of 20 seconds to 1 minute after about 5 charge/discharge cycles. It is suspicious to me when this does not happen and indicates either old stock or poor chemistry.

Since I had some 600mah lipos for my mini quads I tested them with the Ladybird micro quad for flight duration since that is what Walkera is using in the latest micro quad QR Infra-X with sonar and IR capability and successfully flying it at over twice the Ladybird V1 AUW. After flight the motor temperatures were 84F/29C, lipo 75F/24C, Flight controller 81F/27C when flown in an ambient temperature of 65F/18C.

1. Tiger 600mah 15c 15.3g(~$2.20ea @Aliexpress) 12.5min
2. Turnigy Nano-Tech 600mah 35-70c 16.1g(~$2.58ea +ship @HK) 14min

Cheers,
Jim
Quadrocopter and Tricopter Info Mega Link Index


Quote:
Originally Posted by FyreSG View Post
Are all the LB clones using the same type battery (TC702035U, 330mAh)? The two stock batteries for WLtoys V939 are of poor quality. The most important flaw is the lack of "punch" and it definitely does not have a capacity of 330mAh.

I just tested my Turnigy Nano-tech 250mAh 35-70C batteries. I am totally surprised at what my V939 can do! I had assumed the quad felt rather sedated because it was designed that way, then I tried the nanotechs. It felt like a totally different beast! It was extremely responsive and agile, and can fly noticebly faster. There is also an additional bonus of slightly longer flight time.

Has anyone tried other compatible batteries on the V939, other than the stock or nanotechs? Are they good?
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Old Oct 08, 2012, 11:16 AM
RC Logger Support
jlcamp7's Avatar
United States, WV, Hurricane
Joined Jan 2010
3,259 Posts
This was posted a few pages back and may give a little insight.

Edit: You beat me out in posting Jim.


Quote:
Originally Posted by Stenkryparen View Post
Best LiPo in my X100 is the original 300mAh (weight/ flying time), the same as sold on banggood as spare batteries for the MiniPet, they are cheap when bought in 5pack and shipping is free.
This is compared to the 350mAh delivered with the V939, 300mAh Nanotech from Hobbyking and Walkera 240mAh original for the Mini CP heli.

LiPo stated capacity and true weights:
300mAh X100 original (MiniPet) from Banggood 7,8gram
350mAh V939 original 9,6 gram
300mAh Nano tech 7,9gram
240mAh original Mini CP heli 7,3gram
240mAh Nanotech 7,3gram

I bought a couple of the 300mAh NanoTech because the are stated to cope with 5xC loading current, don't try it the will be destroyed immediately even when using 3xC loading current.

The 300mAh X100 original (MiniPet) cope well with deep draining (flying until the quad auto land), who want to quit flying before the low voltage protection is actuated.
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Old Oct 08, 2012, 11:20 AM
RC Logger Support
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United States, WV, Hurricane
Joined Jan 2010
3,259 Posts
Jim,

Were you able to feel any real difference from these lipo's when not testing in just a hover? Have you personally tried the nano-techs? I ordered some of the 300mah (mini pets last week) and am patiently waiting for another few weeks when they arrive.
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Old Oct 08, 2012, 11:24 AM
KDS450QS(ZYX4),V977,CX-20
FyreSG's Avatar
United States, CA, Monterey
Joined Apr 2012
5,111 Posts
Thanks Jim! It seems that the Mini Pet battery UDI U816 battery is the best value for money!

UDI U816 battery: http://www.banggood.com/Wholesale-Ud...0-p-48851.html

Mini Pet battery: http://www.banggood.com/Wholesale-Mi...y-p-48703.html

5 x Mini Pet batteries: http://www.banggood.com/Wholesale-5-...y-p-49642.html

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Last edited by FyreSG; Oct 08, 2012 at 11:43 AM. Reason: Jim informed me of his error.
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Old Oct 08, 2012, 11:29 AM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
Joined Feb 2007
14,588 Posts
Hi J,
Yes the above was specifically for OEM lipo comparison. I do have the 300mah 7.9g Nano-Tech lipos and they are also good performers in the above test with 9.5min and good punch. I noticed that the 330mah had less punch than all the others, but again I am suspicious that these were not great quality to begin with.
Cheers,
Jim
Quadrocopter and Tricopter Info Mega Link Index
Quote:
Originally Posted by jlcamp7 View Post
Jim,

Were you able to feel any real difference from these lipo's when not testing in just a hover? Have you personally tried the nano-techs? I ordered some of the 300mah (mini pets last week) and am patiently waiting for another few weeks when they arrive.
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Old Oct 08, 2012, 12:37 PM
MassiveOverkill's Avatar
United States, FL, Melbourne
Joined Feb 2011
5,180 Posts
Quote:
Originally Posted by jesolins View Post
F,
I agree with that assessment. Either those V939 lipos are overrated, or end of shelf-life.

Test results with 7 OEM lipos:
*All lipos taken off the charger and measured at 4.2v
*All tests were gently stationary hover indoors using the Walkera Ladybird V1
1. WLToys v939 330mah 10.2g 5min
2. WLToys v939 330mah 10.2g 5min
3. Walkera Ladybird V1 240mah 8.0g 9.0min
4. UDI U816 250mah 8.1g 9.5min
5. UDI U816 250mah 8.1g 9.5min
6. MJX X100 300mah 8.1g 7.5min
7. Mini Pet V997 300mah 8.1g
7.5min

Cheers,
Jim
Quadrocopter and Tricopter Info Mega Link Index
I'm assuming you have all the quads above. How do the Mini Pet and MJX X100 compare to each other as well as to the 939? Thanks.
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Old Oct 08, 2012, 01:06 PM
Get Airborne
Sweden, Skåne County, Hofterup
Joined May 2012
339 Posts
X100 compared to LB is >4 grams (10%) heavier, this could perhaps explain why the 240mah walkera don't give me long flyingtime, as is the case when used in the LB. And I only tested with one battery, could be a bad example.

The 330mAh OEM delivered with V939 is definitely a very bad LiPo, short lived and bad capacity when new.

X100/ Minipet 300mAh LiPo give me 40-50 flights with good punch and time. Charging current is mostly 1xC and sometimes 2xC. I always use all available power and fly as long as its possible.

My spare part LB (V2 FC) arrived today, built it some minutes ago. Now waiting for my ordered Devo 7E, so I can try the micro quad king.

I shall also test LBs flying times with different batteries when my transmitter will arrive.
I have new examples of following LiPo:
-X100/ MiniPet OEM 300mAh
-Nanotech 300mAh
-Nanotech 260mAh (replacement for walkera 240Mah)
-Walkera OEM 240mAh

I let you now the result.
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Old Oct 08, 2012, 01:26 PM
Registered User
Poland, Śląskie, Bielsko-Biala
Joined Jan 2012
634 Posts
Quote:
Originally Posted by jesolins View Post

1. WLToys v939 330mah 10.2g 5min
2. WLToys v939 330mah 10.2g 5min
Thank you Jim for your extensive testing !

That confirms my suspicions from the very first day i unboxed V939 and explains not so good reviews of V939.

Stock lipo is just crrrap, shame on WL Toys, because V911 and V929 stock lipos are decent.

I now have 5x nanotech 300 35-70C in daily usage, and just recieved 3x 260 mAh nanotech (LB replacement), will test them soon.

Mini Pet lipo also looks good

FyreSG:

I'm glad that you joined V939-beast club

Jim:

How do you feel for a full-fledged review LB V1/2 vs V939 ?
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Old Oct 08, 2012, 01:49 PM
Get Airborne
Sweden, Skåne County, Hofterup
Joined May 2012
339 Posts
TOM Z measured this figures (LB), in another thread. I don't now if telemetry was enabled or not.
Quote:
" Flight Time: - Walkera 240 mah 25C stock battery.
2 Minutes: 3.93V
3 Minutes: 3.84V
4 Minutes: 3.79V
5 Minutes: 3.74V
6 Minutes: 3.71V
7 Minutes: 3.67V



Flight Time: - Hyperion 240 mah 25C battery.
2 Minutes: 3.94V
3 Minutes: 3.85V
4 Minutes: 3.79V
5 Minutes: 3.74V
6 Minutes: 3.70V
7 Minutes: 3.65V"
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Old Oct 08, 2012, 01:51 PM
RC Logger Support
jlcamp7's Avatar
United States, WV, Hurricane
Joined Jan 2010
3,259 Posts
Anyone use one of these for charging?

http://www.wowhobbies.com/hm-cb180-z...1-2-1-1-1.aspx



My ladybird charger seems a little finnicky and because of that I can't verify whether or not it's sometimes getting a full charge. I have a lipo voltage reader but it only works on 2s or more. Didn't realize when I picked it up last week as I was wanting it specifically for these little walkera lipo's to verify whether or not there getting fully charged.
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