RC India

hi

I'm planning to build the Hobbyking X666 Glass Fiber Quadcopter Frame 666mm with Turnigy Multistar 20 Amp Multi-rotor Brushless ESC 2-4S.

is that ESC correct choice for this??

I request the multirotor guys here to suggest me the suitable motors for this either from hobbyking or local hobby shops.

 :hatsoff:

yes the esc is perfect for motor go for sunnysky 980kv from rcmumbai.com

The SS980kv are very good motors, but for the frame mentioned, I would suggest a lower kv motor. The SS980 on 4s are good for around 1-1.2kg AUW. If you use the SS980's then 30A esc would be a safer option. For lower kv motors 20A should be enough.

Ashimda sir
this quad is not a heavy lifter frame like your tarot so these motors should be good.

Or he could use Emax 810kv motors.

thank u guys but hobbyking suggests 28-XX 1100~1300KV Brushless motors

the frame weight is 415g (w/out electronics)

don't get those ntm motors they are crap ( I am saying this based on 100's of reviews)

with that E-max motor 20A ESC ok or should I go for higher rating ESC?? propellers suggest me the propellers also.

20amp esc is ok. 10" prop is included but I suggest go for 11" or 12" on 3s. http://rcsportz.com/index.php?route=product/product&path=70_82&product_id=92 (http://rcsportz.com/index.php?route=product/product&path=70_82&product_id=92)

You mean 666 mm diameter? Why not a little smaller like a 450 or less

hi sachin,should we start from a smaller one??? bigger is not a stable or what?? thank u..

It's not that. Bigger will fly more stable.

Hi Dinesh, bigger frames means more load to lift and therefore powerful motors and Esc...things start getting expensive..one crash and you will be discouraged.
Not disagreeing with rcritesh.

about the motors:

should I get 2 CW and 2 CCW motors ?? thank you.

Or you can get the quadcopters kit from qk.

Go for nylon arms like quads  such as alien frame quads etc,they are very very strong

My doubt is whether the 2 motors should be ccw?

Don't worry about those CW CCW written on those motor listings.

Basically all it's referring to is "The threading of the prop adapter" and not "how the motor is going to spin"
If you are getting CW CCW set then well and fine. If not, don't run behind it. It's not essential as such.

You can easily reverse the rotation of any of these BLDC motors by simply swapping any 2 wires (from the ESC to the motor)

The above is right.

Quality of sensors and esc refresh rates have improved and you can ignore cw ccw rotation.

all you have to do is make sure that the prop is pushing air downwards and the prop speeds up when
that axis dips

thank u all for the clarification.pls provide a link to know about the basics and setting up a multirotor.

This video here will help in understanding the basics of a quad:
https://www.youtube.com/watch?v=6ffbe8nnuVc&list=UUEIB8GWz-ToKXqrm69EwU9Q (https://www.youtube.com/watch?v=6ffbe8nnuVc&list=UUEIB8GWz-ToKXqrm69EwU9Q)

that video is about setting up the KK board..I want to know  about the basics of a quad building n installing the electronics.thank u.

There are several steps.... I think the frame motor and Esc selection are main steps. So did you select the frame ?

The same hobby king x666 frame,its not that much heavy to go for bigger electronics.

If thesame frame then you should go for the mt2216 800kv motors with blueseries 30 amp esc dont forget 11*4.7 prop.

Ok now you will have to add up the overall weight (all up weight AUW). I know this is before you select the motors and Esc but you can take approx values for those for now. Remember motors prop and Esc are 4 in each quad so add accordingly. Add the flight controller and everything else. What ever weight you get multiply by 3 to factor 3 times the AUW weight...then divide it by 4....this number is the approx thrust to be obtained by each motor and prop combination. Once you get the number let us know.

(Edited)

Duplicate comment..

assume the motors to be 70grams each so 280 grams of motors, esc to be 35grams each so 140grams, controller to be 25grams, frame 420grams, battery 350grams, miscellaneous to be 100grams. Totals to about 1315grams.

You will need the motors to produce more than 2.5xthe frame weight so your motors need to produce more than 3kg thrust to be future proof, the 2216 800kv motors produce 1kg thrust with 11" props, collectively produce more than 4kg!!!!

Is this one is same as the hk frame http://www.rcbazaar.com/products/1465-hiller-x525-v3-glass-fiber-kit.aspx (http://www.rcbazaar.com/products/1465-hiller-x525-v3-glass-fiber-kit.aspx)

Yes same but smaller.

can we mount 22-xx motors where its suggested as 28-xx motor in the quad frame??

Go to www.ecalc.ch and check rpm and max amp ratings for similar motors

Ecacl.ch is not ment for beginners
U cant mount 22 size motors on  28 size mounts
Unless specified that the mounts are compatible with other size motors

Its mentioned as motor bolt holes 14~30mm

I don't recommend ecalc, gives headache!!!

 :iagree: agree with sooraj

I think one may understand all the terms in ecalc after one or two builds, It seems a powerful tool though :thumbsup:

ok here is another simpler excel based one..

http://flitetest.com/articles/choosing-multicopter-motors (http://flitetest.com/articles/choosing-multicopter-motors)

can we mount 22-xx motors where its suggested as 28-xx motor in the quad frame?? Its mentioned as motor bolt holes 14~30mm

So , new to Rc and Building a Quad , Huh? ???

(Just Like Me)

Refer this Blog By OscarLiang(Honk kong) Every thing a Beginner need to know about Quads and Lot more!!!

http://blog.oscarliang.net/build-a-quadcopter-beginners-tutorial-1/ (http://blog.oscarliang.net/build-a-quadcopter-beginners-tutorial-1/)

This is where I Learned Many things, Try for Yourselves. This is the One stop spot For all you need to know.  :thumbsup:

For understanding quad electronics , and PID settings, Refer this Blog...

http://blog.oscarliang.net/build-a-quadcopter-beginners-tutorial-1/ (http://blog.oscarliang.net/build-a-quadcopter-beginners-tutorial-1/)

how the watts power of the motor is related with the thrust in kg??

for example if a motor's power is 300W means it can lift 300g????

Electrical power of a motor is calculated by multiplying the voltage input to the motor and current drawn by the motor.

For example, lets say, you're powering a motor with a 3S LiPo (~12v) and the motor draws about 15A to swing a certain prop,
the motor's power is 12V * 15A = 180W

I don't think there is any formula to directly derive power output of motor in kg-thrust from watts. So 300W is NOT equal to 300g.

Higher the wattage of motor, more thrust it is capable of producing.

@dinesh.fly
Thumb rule for relating watts to thrust:
1. High kv/ small dia (5-6") prop 3-4gms per watt
2. Med kv/ med dia (7-9") prop 4-5gms per watt
3. Low kv/ larger dia (11-12") prop 7-9gms per watt

For a given dia, finer pitch will give better gms per watt static thrust than coarse pitch