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Old Sep 11, 2013, 01:55 PM
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United States, NY, New York
Joined Jun 2012
67 Posts
Help!
SunnySky 600kv + 4s + 30A + 13" Prop Flight Time

Hello all,

I am a little disappointed with my setup which based on other postings in this forum I should be getting a much longer hover time.
The setup below is my latest:

All up weight 2,800gr with the following included:

Naza M + GPS
Tarot 650 Carbon Fiber Frame
Sunnysky 600kv (From Bambucopter)
Afro ESC 30a (HK)
13"x4 Carbon Fiber Prop (From Bambucopter)
Venom 20c 4s Lipo 5000 mah (one only, lifting two was challenging)
Brushless Gimbal + Sony Nex (included on the AU weight)

I am getting 6 min. End each cell ending at 3.75v

Other postings mentioned same setup (but with go Pro) hovering between 12-18 minutes! I am lucky to get 8 minutes with mine. What is wrong? Using e-calc I shows 9.8 minutes but I am not getting that either.

Any light? Thanks for your help in advance.
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Last edited by TopViewShots; Sep 11, 2013 at 05:47 PM. Reason: title change
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Old Sep 11, 2013, 09:45 PM
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New Zealand, Canterbury, Christchurch
Joined Dec 2012
1,419 Posts
3.75v is quite high under load. You could probably quite happily go down to 3.5v which would buy you a decent amount more time. You want to aim to be putting 80% back in your battery when charging, so in your case you want to put 4000mAh back in.

What does your charger report is being put back in?

You also don't have a lot of pitch on your props. You don't mention exactly which motors but seemingly you'd be better off with 13x6 props to get your throttle down a bit for hover (at least according to ecalc)
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Old Sep 14, 2013, 08:06 PM
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United States, IL, Cowden
Joined Mar 2013
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Quote:
Originally Posted by TopViewShots View Post
Hello all,

I am a little disappointed with my setup which based on other postings in this forum I should be getting a much longer hover time.
The setup below is my latest:

All up weight 2,800gr with the following included:

Naza M + GPS
Tarot 650 Carbon Fiber Frame
Sunnysky 600kv (From Bambucopter)
Afro ESC 30a (HK)
13"x4 Carbon Fiber Prop (From Bambucopter)
Venom 20c 4s Lipo 5000 mah (one only, lifting two was challenging)
Brushless Gimbal + Sony Nex (included on the AU weight)

I am getting 6 min. End each cell ending at 3.75v

Other postings mentioned same setup (but with go Pro) hovering between 12-18 minutes! I am lucky to get 8 minutes with mine. What is wrong? Using e-calc I shows 9.8 minutes but I am not getting that either.

Any light? Thanks for your help in advance.
You can go down to 3.5v / cell under load. Thus will recover to 3.75v / cell. This will help...but still not double your air time.

Probably any steeper pitch prop, with a 600KV motor on 4S, it may stall.

Have you thought of trying a 5S? One more volt will allow another 600rpm's, which may give you more lift to throttle ratio. Check on the esc rating, first though.

Assuming you're flying in gps and/or atti modes. Try this:

In manual mode: when you go full throttle, does it shoot straight up? Anything other than straight up, soemthing isn't quite right. This translates to the FC making more corrections in flight...all using more juice.
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Old Sep 17, 2013, 07:30 PM
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United States, CA, Roseville
Joined Feb 2012
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Going up to 5s will add 4.2 volts on a full pack givong another 2400+ rpm. You would likely need smaller props to do that and keep your amps under limits. Not to mention your esc's might not like 5s. Just check first.
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Old Sep 19, 2013, 04:22 AM
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Joined May 2011
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6 min is good result for 2800gr AUW and 3.75v per cell end.
Try under the 2500gr AUW if possible and 3.5V per cell end.
Get rid of unnecessary weight. then it will be above 10 min
My same Quad build 1200gr and 20 min hower fly time with 4500mAh zippy compact lipo (470gr)
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Old Sep 22, 2013, 08:35 PM
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United States, NY, New York
Joined Jun 2012
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Based on your input I set a LIPO alarm to buzz at 3.50v per cell and now I am getting 8 minutes with AUW of 2,800g and 11-12 minutes with no load. Thanks!
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Old Sep 22, 2013, 08:39 PM
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United States, NY, New York
Joined Jun 2012
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Quote:
Originally Posted by RDTague View Post
You can go down to 3.5v / cell under load. Thus will recover to 3.75v / cell. This will help...but still not double your air time.

Probably any steeper pitch prop, with a 600KV motor on 4S, it may stall.

Have you thought of trying a 5S? One more volt will allow another 600rpm's, which may give you more lift to throttle ratio. Check on the esc rating, first though.

Assuming you're flying in gps and/or atti modes. Try this:

In manual mode: when you go full throttle, does it shoot straight up? Anything other than straight up, soemthing isn't quite right. This translates to the FC making more corrections in flight...all using more juice.
I am using HK Afro's and SunnySky 4108 motor so 5S is not allowed as per specs.
Thanks for the idea!
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Old Sep 22, 2013, 08:42 PM
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Quote:
Originally Posted by snipeworm View Post
Going up to 5s will add 4.2 volts on a full pack givong another 2400+ rpm. You would likely need smaller props to do that and keep your amps under limits. Not to mention your esc's might not like 5s. Just check first.
I've checked and Afros and SS 4108 only take 2-4S batteries. Thanks!
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Old Sep 23, 2013, 01:58 PM
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Well. Give me a week for UPS to arrive and I'll have a comparison for you.

I just ordered a Tarot 690S that I'll be using SunnySky X2216-11 880KV II motors, 30A Opto ESC's, Naza V1 w/gps, swinging 1238 props off of 4S/5300/30C GensAce power. With all the other "stuff"(osd, vTx, tarot BLG, etc.), I'm shooting for an AUW of 3000 grams...3500 if I run 2x 4S LiPo's.
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Old Sep 23, 2013, 09:50 PM
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Canada, QC, Saguenay
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Quad vs Hexa, not sure if you can really compare.
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Old Sep 23, 2013, 10:52 PM
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Originally Posted by jparchib View Post
Quad vs Hexa, not sure if you can really compare.
You are correct. I was thinking the 650 was a hex, too. No, not to compare, at all.
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Old Sep 23, 2013, 10:56 PM
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I'm using the 4108 sunnies with a rc timer brushless gimbal with gopro one on 3300 4s. I hover at about 17 amps. I can do roughly 9 minutes. I plan to go to a 4500 mah Lipo for 10+ minute flights. I'm using 12x4.5 APC multirotor props but plan on going for some 13x4 carbon fiber props.
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