Thread Tools
Feb 28, 2012, 11:48 AM
Registered User
Discussion

Battery selection for DJI F550 hex kit


HI

I am going to be building my first multicopter (settled on DJI F550 ARF with NAZA). Quick question (yes I am total newbie) - I was told to get a 4S 4000-6000ma battery. I can see a few options on the internet but with different C ratings 30C vs 40C vs 50C. Can anyone provide some recommendations here? I don't understand the difference, but want an optimal choice for my set up in terms of flight time and power (I am using the stock DJI motors). Thanks
Sign up now
to remove ads between posts
Feb 29, 2012, 06:35 AM
Registered User
Anyone?
Feb 29, 2012, 07:11 AM
Registered User
OK, let's see if I can help a little.

The 'C' rating tells you how much current you can reasonably expect the pack to deliver but it is a very vague number in most cases as the quoted rating is not usually based on cells assembled into a pack but special testing on a single cell in very favorable circumstances

So for a 5000mAh pack with a 40C rating they are claiming it can support up to 200 amps continuous, which few if any of them actually will, but fortunately you are not likely to be drawing that much either ...

The other consideration is that weight tends to increase along with higher C ratings (and capacity) and you don't want to carry more weight than you need.

In the absence of any specific recommendations from others I'd say don't go beyond a 40C pack and in all probability a 30C pack would still be perfectly adequate.

Now, a brief question in return

Did your F550 ship with both 8" and 10" props?

Just curious as the manual lists both in the box, but mine only had 10" included.

Just wondering if that is 'normal' or if something got left out by accident?
Mar 01, 2012, 06:05 PM
Registered User
30C should be enough, my F550 comes with both 8 x 8" and 8 x 10" prop
Mar 01, 2012, 07:47 PM
Registered User
The higher C rating means the more current output of the battery, which help save the battery and make it last longer meaning more cycles. The lower C rating will work but for more power and longer lasting battery go to the higher C Rate 40 or 50 will be more than enough but you can even go higher it will not hurt angthing you just end up with cooler running battery and can charge it quicker as well.

Michae64
Mar 02, 2012, 04:25 AM
Registered User
Quote:
Originally Posted by Telrin
OK, let's see if I can help a little.

The 'C' rating tells you how much current you can reasonably expect the pack to deliver but it is a very vague number in most cases as the quoted rating is not usually based on cells assembled into a pack but special testing on a single cell in very favorable circumstances

So for a 5000mAh pack with a 40C rating they are claiming it can support up to 200 amps continuous, which few if any of them actually will, but fortunately you are not likely to be drawing that much either ...

The other consideration is that weight tends to increase along with higher C ratings (and capacity) and you don't want to carry more weight than you need.

In the absence of any specific recommendations from others I'd say don't go beyond a 40C pack and in all probability a 30C pack would still be perfectly adequate.

Now, a brief question in return

Did your F550 ship with both 8" and 10" props?

Just curious as the manual lists both in the box, but mine only had 10" included.

Just wondering if that is 'normal' or if something got left out by accident?
Thanks. That certainly clarifies. As for the props - have not received kit yet but it does say a pair of 10" and 8" -which is puzzling. Would one put different size props on a single craft?
Mar 02, 2012, 05:01 AM
Registered User
Quote:
Originally Posted by copters3d
Thanks. That certainly clarifies. As for the props - have not received kit yet but it does say a pair of 10" and 8" -which is puzzling. Would one put different size props on a single craft?
No, you will need 6 the same size.

Each 'pair' is one CW and one CCW of the same size, so 3 pairs gets you a set.
Mar 02, 2012, 05:55 PM
Registered User
8" prop is for 4S, use 10" if you have 3S lipo, my F550 hover at 22amp using 3S 35C battery.
Mar 26, 2012, 01:21 PM
32 ft/sec^2 sucks
yoadrian's Avatar
What kind of flight time can you expect with a 5000mah 3S pack stock with no payload?
Mar 26, 2012, 01:26 PM
I never finish anyth
3s and 10inch props = higher payload
4s and 8inch props = more sport flying

There are so many variables to flight times... it's easy to assume about 10 minutes depending on weight and how you fly. More sport flying = less time, general hover = more time. It's best to just test it then check your battery to see how much you ran it down (I start with 6 mins.... then 8.... then 10mins...
Mar 26, 2012, 10:00 PM
SMILE you're being recorded :)
Velociraptor73's Avatar
Quote:
Originally Posted by MCrites
3s and 10inch props = higher payload
4s and 8inch props = more sport flying

There are so many variables to flight times... it's easy to assume about 10 minutes depending on weight and how you fly. More sport flying = less time, general hover = more time. It's best to just test it then check your battery to see how much you ran it down (I start with 6 mins.... then 8.... then 10mins...
I think hovering consumes more power then flying forward.
Mar 27, 2012, 07:43 AM
I never finish anyth
I guess it depends on definition. In general hover I do move around a bit, just easy level flight @ 50% throttle. When I am sport flying I am almost constantly above 50% throttle in climbs and banked turns. More throttle = more RPM = more juice to run the motors
Mar 27, 2012, 08:09 AM
My cat moderates better
BillzillaAus's Avatar
Quote:
Originally Posted by MCrites
3s and 10inch props = higher payload
4s and 8inch props = more sport flying
I'm curious about why that is so?
Jun 07, 2012, 04:37 PM
KittyKatt

Got two coming


Getting tired/bored of my f450 and 550 so I order two bare kits, BBB, from HobbyCool and some spare parts .. Ordered my fourth NAZA from HeliProz.. After adding it up (motors and esc) I might as well have bought the full kit but was afraid of the OEM NAZA and it's oddities. . Of course we are waiting on the NAZA GPSs this month probably not supported on BBB version I would think.

Thanks for the thread as it made up my mind. I have been waiting on HK to get theirs but free freight (HL) and almost instant gratification makes it better. Even though I had to buy motors this way. Thanks again.
Jun 07, 2012, 10:13 PM
SMILE you're being recorded :)
Velociraptor73's Avatar
Quote:
Originally Posted by Velociraptor73
I think hovering consumes more power then flying forward.
Yep, I was wrong! Hovering gives me considerable more time on the air than flying around.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product DJI-F550 Hexa ARF+NAZA Kits Now in Stock At RcHobbyHelicopter johnIn2SonAZ Multirotor Drone Talk 4 Feb 10, 2015 09:19 AM
Discussion DJI F550 Hex Build, with 2-axis NEX-5N/GH2 Gimbal... GGoodrum Multirotor Drone Talk 9560 May 27, 2014 11:06 PM
Discussion Pics of my new DJI FlameWheel F550 brianshell Multirotor Drone Talk 21 Mar 20, 2012 06:40 AM
Discussion DJI F550 Hexa Custom Build by AddictiveRC johnIn2SonAZ Multirotor Drone Talk 31 Mar 18, 2012 04:23 PM
Help! What Tool?? Hex screw kit for copterx oacilamaf Electric Heli Talk 4 Feb 23, 2012 01:05 PM