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Jan 16, 2011, 10:38 AM
Quad Whisperer
Thread OP
Discussion

My heavy-Lift HexaCopter


I have been playing around with a heavy-lift hexacopter.


Some data:

Size: 70cm motor-to-motor
Weight: 3kg with batteries.
Motors: NTM Series 35-36A 910Kv / 350W
Propellers: APC 12X3.8
ESC: Turnigy Plush 25A
Controller: KK
Batteries: 6 x Turnigy nano-tech 2200mah 3S 25~50C
Frame: aluminium rectangular tube 15 x 25 mm/


Some performance data:

2.2kg payload:
11.34A per motor, 68.04A total
132.6W per motor, 795.6W total

3.1kg payload:
14.25A per motor, 85.5A total
161.8W per motor, 970.8W total

4.1kg payload:
18.64A per motor, 111.84A total
207W per motor, 1242W total

5.2kg payload:
25.51A per motor, 153A total
272W per motor, 1632W total

6.1kg payload:
28.33A per motor, 169.98 total
297.1W per motor, 1782.6W total
Comment: poor control.

7.1kg payload:
32A per motor, 192A total
332.3W per motor, 1993.8W total
Comment: No control, motors at full throttle.


Conclusion:
Maximum practical payload seem to be about 5kg, total weight of 7kg.


Here is a video of the lifting tests:

My Heavy-Lift HexaCopter (4 min 20 sec)



Later I am going to find maximum practical payload for forward flight.
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Jan 16, 2011, 11:13 AM
Jakub J's Avatar


Can you measure hovering time with 1, 1.5, 2kg?
Will be useful infor for AP flying (with dSLR)...

Jakub
Jan 16, 2011, 02:56 PM
Registered User
Kaptein -

Kudos on the weightlifting! Wow~!

I have been doing similar experiments using your controller board, except on a quad.

Two things I am amazed about:
1) You are only using 25A ESC's! Were they nice and toasty after those flights?

2) I have been using 13x6.5 APC props coupled with Turnigy C42-50B 600kv and a 4C battery. I can comfortably lift a 5-lb (2.25kg) weight, but I have not been able to dial in the stability that your demonstrated.

How did you decide upon 12" props, and do you have any tips for tuning the pots when you're throwing that much weight around?!

One other question: I have been using a frame that is not well suited for heavy lifting. In fact, its creator (the poster just above me) told me so!!

What are you using for center frame plates on that monster?
Jan 17, 2011, 06:05 PM
Quad Whisperer
Thread OP
Quote:
Originally Posted by Jakub J


Can you measure hovering time with 1, 1.5, 2kg?
Will be useful infor for AP flying (with dSLR)...

Jakub
Yes, I can do that when the weather permits.
Jan 17, 2011, 06:28 PM
Quad Whisperer
Thread OP
Quote:
Originally Posted by Craigolio
Kaptein -

Kudos on the weightlifting! Wow~!

I have been doing similar experiments using your controller board, except on a quad.

Two things I am amazed about:
1) You are only using 25A ESC's! Were they nice and toasty after those flights?

2) I have been using 13x6.5 APC props coupled with Turnigy C42-50B 600kv and a 4C battery. I can comfortably lift a 5-lb (2.25kg) weight, but I have not been able to dial in the stability that your demonstrated.

How did you decide upon 12" props, and do you have any tips for tuning the pots when you're throwing that much weight around?!

One other question: I have been using a frame that is not well suited for heavy lifting. In fact, its creator (the poster just above me) told me so!!

What are you using for center frame plates on that monster?
1: The esc where only lukewarm. They are placed directly in the airflow.

2: The propellers you use might have to high inertia. The 12 x 3.8 slowflyer prop is resonably light for its size.

As the weight of the MC increases, the gain has to go down. I had to reduce it from 100% to 50%.

The centerplate is 17.5cm diametre aluminium discs with 1.5mm thickness.
Jan 17, 2011, 06:41 PM
Registered User
bob4432's Avatar
any chance we could see the power distribution?
Jan 17, 2011, 10:06 PM
Registered User
Quote:
Originally Posted by kapteinkuk
1: The esc where only lukewarm. They are placed directly in the airflow.

2: The propellers you use might have to high inertia. The 12 x 3.8 slowflyer prop is resonably light for its size.

As the weight of the MC increases, the gain has to go down. I had to reduce it from 100% to 50%.

The centerplate is 17.5cm diametre aluminium discs with 1.5mm thickness.
Very interesting.

I am using 60A Turnigy Plush ESC's with the 13x6.5 props because that is what the MK Hexa XL uses, I think the motor has what it takes to properly spin that prop, but it requires a lot more juice! I am thinking, however, that the 600KV is probably working against me.

I also wonder if I should be using more than one 4S battery. Did you use six batteries in order to be able to meet the higher amp draw that the heavy lifter would require?

I'm with Bob - I would like to see the power distribution - that is, how you connected six batteries together and how the esc's are connected.

Thanks for sharing your video and specs! Now to go find a place to design some aluminum center plates . . .
Jan 18, 2011, 06:28 AM
Quad Whisperer
Thread OP
I used 6 batteries for the higher amp draw and for simplicity.
Each ESC has its own battery and LV alarm. They are not connected together. No point in letting all that current pass through a single connector.
Jan 18, 2011, 04:35 PM
Quad Whisperer
Thread OP
I managed one flight time test before the rain.

2kg payload: 9 minutes (mixed flying)
Jan 19, 2011, 12:41 AM
Registered User
is that your own controller? can I buy that controller. I want to build a rig to carry a canon 7d camera.
Jan 19, 2011, 01:37 AM
Registered User
bob4432's Avatar
that would be rolf's (kapteinkuk) controller - https://www.rcgroups.com/forums/show....php?t=1143569

he was more than generous in the fact that he gave the controller to the community, both hardware and software - it is a work of pure genius.
Jan 20, 2011, 02:59 PM
Quad Whisperer
Thread OP
Here is a video of test flying with 4 kg payload.

Hovering time is about 6 minutes.

Heavy-Lift HexaCopter Fast Forward Flight With 4kg Payload (3 min 14 sec)
Jan 20, 2011, 03:01 PM
Pants first, then shoes
I saw that video on your youtube channel, awesome effort.
Jan 20, 2011, 03:19 PM
Registered User
What will you name this one.... the Behemoth?

Or probably more appropriately Ziz.. Anyway nice heavy lifter. v impressive.
Last edited by Niall; Jan 20, 2011 at 04:18 PM.
Jan 20, 2011, 04:38 PM
Registered User
bob4432's Avatar
kaptein - what are you using for the weight? looks to be water?? looks incredibly stable. very nice work


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