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Motors for Multicopters

Klonas

Senior Member
#3
What is a difference between a ''simple'' motor and a multicopter motor? And if I have 4 motors on a quadcopter does that mean it has 4 times the vertical thrust?
 

Burg

Never catch a multirotor
#4
Colorex, that HXT 25gr 1300kv is a good motor.
Best performance with a 8x4 props on a 3cell and 9x6 on a 2cell.
That makes it suitable for lets say 500mm quad / tri frames (hobbyking V1 in light spec).
Larger frames require between 28-35 size 750kv and 1000kv motors and 10" to 12" props with 3 or 4 cell lipo's.
Smaller frames around 15-18 size 2000kv with 5"-6" props with 2 cell lipo's.
All depending on the weight off course.
At least, this is my experience ...
I do not recommend prop savers.
 
#5
Yeah I agree with burg I crashed more due to a propsaver failure than actually hitting anything...ill never use them again. A prop is a lot cheaper than losing the whole multicopter
 

ananas1301

Crazy flyer/crasher :D
#7
@colorex: It depends pretty much on the size of your Multicopter, but you should always keep in mind that you want a motor with reasonable low kv so that the motor has lot of torque to accelerate the prop quick enough to compensate any instability.
 

colorex

Rotor Riot!
Mentor
#8
Colorex, that HXT 25gr 1300kv is a good motor.
Best performance with a 8x4 props on a 3cell and 9x6 on a 2cell.
That makes it suitable for lets say 500mm quad / tri frames (hobbyking V1 in light spec).
Larger frames require between 28-35 size 750kv and 1000kv motors and 10" to 12" props with 3 or 4 cell lipo's.
Smaller frames around 15-18 size 2000kv with 5"-6" props with 2 cell lipo's.
All depending on the weight off course.
At least, this is my experience ...
I do not recommend prop savers.
Thanks for the fast and simple answer!

So I suppose that since every motor has 400+ grams of thrust I will have 1200 grams max of thrust on the tri? How long flying time with a 1300mAh 3s or a 2200mAh 3s? Will I need higher C rating than 20C - 30C?

Would it use RD or DD props?

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10048
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10046

I also need the correct prop adapter for the Blue Wonders. Anyone?

I might consider building a tri because of the special opportunities it can bring!
 
Last edited:

colorex

Rotor Riot!
Mentor
#9
Weight

Quantity

Stock

Product description

Price

[TD="align: center"]

[/TD]

 
 

[TD="align: center"]OK[/TD]

HXM2730-1300 - hexTronik 24gram Brushless Outrunner 130..

$24.21

[TD="align: center"]135[/TD]

 
 

[TD="align: center"]OK[/TD]

HXT900 - HXT900 9g / 1.6kg / .12sec Micro Servo

$5.38

[TD="align: center"]36[/TD]

 
 

[TD="align: center"]BK[/TD]

QUAD-CON16K - HobbyKing Quadcopter Control Board V2 (A..
This item is on backorder*

$22.99

[TD="align: center"]99[/TD]

 
 

[TD="align: center"]BK[/TD]

TR_P10A - TURNIGY Plush 10amp 9gram Speed Controll..
This item is on backorder*

$26.34

[TD="align: center"]60[/TD]

 
 

[TD="align: center"]OK[/TD]

GWS-DD-8040 - GWS EP Propeller (DD-8040 203x102mm) (6p..

$3.05

[TD="align: center"]55[/TD]

 
 

[TD="align: center"]OK[/TD]

GWS-RD-8043 - GWS EP Propeller (RD-8043 203x109mm) (6p.. (SWARM54170480)

$3.05

[TD="align: center"]55[/TD]

 
 

[TD="align: center"]OK[/TD]

9171000003 - USBasp AVR Programming Device for ATMEL .. (SWARM54170678)

$4.18

[TD="align: center"]35[/TD]

 

[TD="colspan: 4, align: right"]

[/TD]
[TD="align: center"]475g
[/TD]





EconoTri? What do you tricopter guys have to say?
 
#12
Most likely - yesterday was the last day of getting it from local warehouses before Crimbo so if you act fast I suppose that you'll be alright and once its passed out of HK it should be good.
 

Burg

Never catch a multirotor
#13
Thanks for the fast and simple answer!

So I suppose that since every motor has 400+ grams of thrust I will have 1200 grams max of thrust on the tri? How long flying time with a 1300mAh 3s or a 2200mAh 3s? Will I need higher C rating than 20C - 30C?

Would it use RD or DD props?

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10048
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10046

I also need the correct prop adapter for the Blue Wonders. Anyone?

I might consider building a tri because of the special opportunities it can bring!
In general you can count with 3 times the thrust mention, so 1.2 kg on the tri. I never measured it but it is enough for carry a 0.5ltr full water bottle around ;-) Tri to get it in hoover at half throttle, then it is perfect.

A 1300mah will not give a long flying time. Even very short and can be 'dangerous' for quickly being out of power and crash. A 2200mah is better, gives about 5 minutes max. I start using 2650, 3300 and 4000 mah's to get some more time to practice and not worrying when to land. Remember to program the esc's in Ni-xx type.

C-rate? As high as possible. Turnigy Nano Techs are the best (20-50C are enough). Make sure you use a voltage alarm (led's + accoustic).

Those HK props will work but need quite a bit of CA tweeking for the correct balance. Best it to get the original APC Slow Flying props. Very sturdy and perfectly balanced out of the bag. Little more expensive .. get those when you have a good trimmed tri/quad.

Prop adapters for the BW should be 3mm. The collet type are shorter then the ones with 'grub screws'. Then you need very good balanced props ..
http://www.hobbyking.com/hobbyking/store/__5572__KD_Colet_adapter_for_3mm_shafts.html
But always back order. Try to get them on ebay or something, very cheap but get more then you actually need as they can be badly balanced.