No, I'm too heavy!

Jurriaan

Jurriaan

Well-Known Member
Hi guys,

I think I need your advices and opinions. A couple of months ago I started building my first quadcopter. Since then, with ups and downs, I learned a lot and finished my first concept. Attached a photo and below the configuration. Good to mention, my goal is building a quadcopter which I can use for filming using a gimbal.
  • 450mm frame.
  • CC3D flight controller.
  • Battery 2700mAh 3S 25C.
  • Turnigy Plush 30amp speed controller (40amp burst).
  • Turnigy D2830-11 1000kv brushless motor (max current 21amp).
  • 1045 props.
  • Hobby King quadcopter power distribution board.
  • Simple BGC 2 axis gimbal.
  • In total 1,6 kg.
The idea was good, I learned a lot but I think I have to replace the motors and battery because I guess the quadcopter is too heavy because my goals changed during the building phase (from “simple” quadcopter to quadcopter with gimbal). Now the motors are getting too warm and I need more than half throttle just to maintain hover. Without the gimbal and camera (less weight) it’s a big difference. I also guess that motors are underpowered and I read on the Internet I need less kv motors (for heavy lifting) and use it in combination with a 4s battery instead of a 3s battery.

I found the following:
  • Battery: I think about 5200mah + 4s + 25 C rating
  • Motors (AX-2810Q-750KV Brushless Quadcopter Motor)
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=25556&aff=99809

Is this enough for lifting a 1,8 kg (bigger heavier battery and maybe separate battery for the gimbal (11,1v)) quadcopter with in mind the filming purposes? And what about the C rating for the battery? I think you need at least a 25 C rating (5,2x25=130 (=4x30 ESC). ESC can burst to 40amp.

Thanks in advance!
 

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GJH105775

GJH105775

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Are you planning on holding a DSLR, or action camera?

Looks like a pretty heavy build for 4 1000kv motors, make sure your motors and ESCs will support 4S, as for having a different battery, you can just use a step down converter to control the gimbal. Lower KV motors are better for lifting, or you can buy more 1000kv motors and make a oct, or hex.




Here is an example build:
Atg x4 with rctimer pancake motors 360 kv, 6s 10000mah. Hover time +45 min, 17 inch Props all up weight 2,8kg
 
Jurriaan

Jurriaan

Well-Known Member
Well, I have a gimbal installed (with a dummy camera). When everything works ok I want to order a GoPro or replica like SJCam. The gimbal is working fine and with my transmitter I can change the pitch of the camera. Works great!

Yes the ESC supports lipo cells 2-4 and the motor I mentioned in my first post supports 3 and 4 cells.

But do you have an advice when I want to use my 450mm frame, with a new 4S lipo, Turnigy Plush 30amp speed controllers and 1045 props? How do I know my suggested motors are sufficient to lift 1,5 kilo? And what about the C rating? Is my calculation correct?
 
GJH105775

GJH105775

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Xiaomi Yi is pretty nice.

Here is how you calculate battery C rate.


The Multistar 5200 10c- 20 C will do 52 amps draw and 105 burst
 
H

HDtallrider

Well-Known Member
Here is a combo that you can use with 3s or 4s and will work with your frame and other electronics:

http://www.ebay.com/itm/like/161835772968?ul_noapp=true&chn=ps&lpid=82
Motor mounts
http://www.ebay.com/itm/4x-Sunnysky...-F450-FY680-/301603704923?hash=item4638fb505b
http://www.ebay.com/itm/New-2-Pairs...-QuadCoptor-/311421472974?hash=item48822a90ce

The motor mount extensions allow the larger props. With 3s 50% throttle should give you just under 1.9kg lift. With a 4s battery and a12v UBEC (for your camera, etc) you should be able to get just over 2.4kg lift at 50% throttle. These motors are pretty efficient as well as strong and will yield impressive flight times. Like GJH105775 said, check into the 6000mah-10000mah 10c batteries from multistar. They are light weight and unless you are an aggressive flier the 10c is more than adequate. Don't forget to balance your props.
 
Jurriaan

Jurriaan

Well-Known Member
Thanks guys.. no I'am not an agressive flier. I just want to build a quadcopter with enough lifting power en fly steady and shoot some videos. I didn't knew that 10c would be good in this situation. Of course I discussed this with HK, they advised me a multistar 4s 10c lipo. But I started to doubt because of the low C rating.

Battery:
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=56840&aff=99809

Motors:
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=25556&aff=99809
 
Jurriaan

Jurriaan

Well-Known Member
PS: good tip for the step down converter. Do you have an example of those? So I can step back from 4s to 3s 11,1 V for powering my Gimbal?
 
GJH105775

GJH105775

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DC-DC adjustable step down (regulator)

Option 1 (Prefered) Option 2
$6.51 or $3.57

I have a couple of the $6.51 ones and they are fantastic.

Also those are some great motors, they'll last good, and can be rewound to extent their life if you have something break or burn.
 
Last edited:
holtneil

holtneil

Well-Known Member
Moderator
Hi mate change the 10x4.5 to 10x4.7 the lift will be amazing my 450 came in at 1.6 and on 10x4.7 prop it took off like a rocket
 
Jurriaan

Jurriaan

Well-Known Member
Ok, 1047 props and voltage regulator are in the cart :) Motors and battery is something for tomorrow. What kind of motors did you used for your 450 Holtneil?
 
holtneil

holtneil

Well-Known Member
Moderator
Hi most 450 use 1000kv to 1200kv if you want a rocket ( 1200kv) if you want a slow fly stable camera ship then 450kv to 600kv all will be good on the 450 , this is my very old one 450 flame wheel 1200kv motors 10x4.7 plastic props just for test ( they ant good get carbon fibre , as plastic lets the quad wollow this is why it hit the floor then took off again as it would not stop on throttle carbon fixes this )
 
Jurriaan

Jurriaan

Well-Known Member
I thought I had a simple question but it's hard to find a "simple" anwser. How can I calculate how many grams a selected quadcopter configuration can lift? I'am not searching for exact numbers, but to give me an impression, an idea. Let's say I choose the following:

- 450mm frame
- 4s multistar 6600mah 10c lipo (http://www.hobbyking.com/hobbyking/...0mAh_Multi_Rotor_Lipo_Pack_EU_Warehouse_.html)
- 750kv motor (http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=25556&aff=99809)
- 30 amp speedcontroller (http://www.hobbyking.com/hobbyking/...ush_30amp_Speed_Controller_EU_warehouse_.html)
- 1045/1047 props

How many grams will it lift and how can I calculate the lift?
 
H

HDtallrider

Well-Known Member
You can subscribe to ecalc. They will give you a rough idea within +/- 15%. BTW I believe those motors are all wrong for your build. They are for heavy lift applications using 13" and larger props and when I was looking around for info on them they seem to have a large # of defects. The better motor manufacturers have some reasonably accurate specs available to help you choose the correct power system. Here is an example of a well done manufacturers chart:

https://cdn.shopify.com/s/files/1/0...ting_-_KDE2315XF-965.pdf?13250022135093590036

As you can see all the information you need is there, including efficiency #'s to help you judge potential flight times. These guy's are the best of the best and they cost accordingly but you can find less expensive, decent motors from SunnySky, Cobra etc. Many of the forum members have found some pretty good cheap stuff out there. Hopefully they will chime in.
Jurriaan said:
I thought I had a simple question but it's hard to find a "simple" anwser. How can I calculate how many grams a selected quadcopter configuration can lift? I'am not searching for exact numbers, but to give me an impression, an idea. Let's say I choose the following:

- 450mm frame
- 4s multistar 6600mah 10c lipo (http://www.hobbyking.com/hobbyking/...0mAh_Multi_Rotor_Lipo_Pack_EU_Warehouse_.html)
- 750kv motor (http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=25556&aff=99809)
- 30 amp speedcontroller (http://www.hobbyking.com/hobbyking/...ush_30amp_Speed_Controller_EU_warehouse_.html)
- 1045/1047 props

How many grams will it lift and how can I calculate the lift?
Click to expand...
 
GJH105775

GJH105775

Off and on
Moderator
Jurriaan said:
I thought I had a simple question but it's hard to find a "simple" anwser. How can I calculate how many grams a selected quadcopter configuration can lift? I'am not searching for exact numbers, but to give me an impression, an idea. Let's say I choose the following:

- 450mm frame
- 4s multistar 6600mah 10c lipo (http://www.hobbyking.com/hobbyking/...0mAh_Multi_Rotor_Lipo_Pack_EU_Warehouse_.html)
- 750kv motor (http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=25556&aff=99809)
- 30 amp speedcontroller (http://www.hobbyking.com/hobbyking/...ush_30amp_Speed_Controller_EU_warehouse_.html)
- 1045/1047 props

How many grams will it lift and how can I calculate the lift?
Click to expand...
http://www.ecalc.ch/xcoptercalc.php
 
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