129min 15s flighttime with quad - Page 3 - RC Groups
May 06, 2013, 03:52 PM
Registered User
Quote:
 Originally Posted by catamar Hello, How is the connection of the balancing cables?. Where do I have to connect them to make a balancing connection, like the one seen in the pictures?
4s4p, this say everything.
Four clusters in series, each of them being four cells in parallel.
Think each four parallel cluster as a single bigger element. The balance wires are the intermediate plus-to-minus connections, as in a 4s lipo.
May 06, 2013, 04:38 PM
Alicante, Espaņa
Thank you Renatoa. Understood.

Quote:
 Originally Posted by renatoa 4s4p, this say everything. Four clusters in series, each of them being four cells in parallel. Think each four parallel cluster as a single bigger element. The balance wires are the intermediate plus-to-minus connections, as in a 4s lipo.
May 07, 2013, 05:31 PM
Quote:
 Originally Posted by renatoa 4s4p, this say everything. Four clusters in series, each of them being four cells in parallel.
So....

4x3400mah cells in parallel = 1 cluster = 1x1S (3.7v) = 13600mah @ 200g

4x1cluster in series = 1x4S (14.8v) = 4x3400mah = 13600mah @ 800g?

Thanks.
 May 08, 2013, 10:12 AM Registered User Close, he wrote his cells have 48 grams. So 32 grams less.
May 12, 2013, 04:34 PM
Registered User
Here a video of 57min FPV with this quad. I could have done more than 60min, but I made a small flight before (with the same battery) to get some shots of the quad for the video:
 12mm Frame Quad big FPV endurance test 57min (7 min 2 sec)

best regards

Ferdinand
May 12, 2013, 05:26 PM
Registered User
Quote:
 Originally Posted by EndOfDays @catamar These cells are 100gr, the Panasonic is 50gr @ed_jza80 These Lipos have good specs, but your numbers are 3S the numbers you cited are 4S. best regards Ferdinand
Funny, I've been using the same battery for years in electric RC. We got them from older cell phone packs. I have a 3 cell pack in my 9CFutaba and even a special charger for them.

Great work flying that long, you know your stuff for sure.
 May 12, 2013, 06:39 PM Flying Wood For Fun Wow!!! and I was happy with 18 minutes lol good job!
May 12, 2013, 06:58 PM
Quote:
 Originally Posted by EndOfDays Here a video of 57min FPV with this quad. I could have done more than 60min, but I made a small flight before (with the same battery) to get some shots of the quad for the video: https://vimeo.com/66010657 best regards Ferdinand
That's fantastic!
 May 12, 2013, 08:14 PM Registered User Ferdinand with all the super low kv motors out now perhaps one of the 120 turn gimbal motors would be enough rpm on 4s
 May 13, 2013, 07:34 AM Mobius Cables... I got em' This is awesome! I may have to build a pack for my flying wing... Its peak Amp Draw is around 10A so a 3s3p should give around 15A Peak? at that I would get a 10.2Ah pack for only around 440g! Right now I can fly for 45 minutes on 2200mah that is 190g and some dead nose weight... I could easily add this pack in. Does anyone know the lifespan of the cells?
 May 13, 2013, 08:05 AM Registered User They are the same as used in laptops, so some years, hundreds cycles.
 May 13, 2013, 08:46 AM Mobius Cables... I got em' nice! gonna order some friday!
 May 13, 2013, 08:59 AM CrashMaster How about taking cells out of something like the Lenovo Slice:- http://shop.lenovo.com/us/itemdetail...47BFB52CC4F8E9 That would give 64Wh 19v and the weight, even in the casing, only 370g. A little expensive but may be well worth the trouble and expense if someone knows how to do it and configure the cells contained in the casing and hook up suitable motors and props.
 May 13, 2013, 09:08 AM Mobius Cables... I got em' 370 is the width... the weight is 940g
 May 13, 2013, 09:20 AM Registered User lol, he already seen himself in the sky for hours Actually 64Wh 340 grams is not terrible, this means close to 200W per kg, which is the energy density of MaxAmps.