Information

ArduCopter User Group

Discussion group for ArduCopter users

Members: 2977
Latest Activity: 4 hours ago

Discussion Forum

An assembled kit for learning to code for control theory?

Started by XJZeng. Last reply by Craig 17 hours ago. 11 Replies

Hi all, I'm hoping that my question is not too open ended.I'm interested in learning how to code the control systems for quadcopters. As a start, I would like to look into solving the equations and…Continue

Coax 8X quad

Started by David Pulvermacher. Last reply by Forrest Frantz on Monday. 4 Replies

Is there any reason why one cannot add four pushers to a quad using just four escs to control all the motors?I know that there would be no redundancy with that configuration, but there is an…Continue

Non-responsive RC Input in Loiter Mode

Started by Austin Madson. Last reply by leonardthall on Saturday. 11 Replies

Hi all,I recently switched to an external GPS/compass (3DR) and resolved some EKS variance issues I was having. Woohoo. So, I went out today to test a few things (Loiter being one of them). When…Continue

tarot t4-3d gimbal compability with pixhawk

Started by Nichon. Last reply by B Petru on Friday. 5 Replies

Anyone managed to get pixhawk to control the t4-3d gimbal?i've tried following the same steps in the wiki but that was for the 2 axis gimbal…Continue

Comment Wall

Comment

You need to be a member of ArduCopter User Group to add comments!

Comment by Ramesh Tahlan on February 24, 2012 at 7:14am

About the issue of thrust, yes, if ur motor has 1000 g thrust, it is supposed to be able to lift a 1000g wt, however, because u never get 100% efficiency, it better to take 80% of that value, so it will lift 800g physically, that is how u calulate the motor thrust u need for a planes. so for a trainer for which u could use a 600g thrust motor for a all up flying wt of 1000g, or 700 to 800 g motor thrust for sport flying of same fly wt  of 1000g or 1200g to 1500g motor thrust for 3D. That is the direct equation and u will never go wrong. There is something called thrust to wt ration, if u have a plane of 1:1 thrust to wt ration, (good enough for sport but not 3D) then if fly wt of plane is 1000g , ur motor thrust is 1000g, but do remember that motor thrust to be 1000g do take efficiency into account so u would actually take a motor thrust of 1200g for 1:1 ration.

Comment by Rui Manuel Cravo Marques on February 24, 2012 at 6:20am

Chris Gough, yes me too. Correct me if I'm wrong, but have you tryied to push a car ? It has about 2000kgs, are you making that force ? I seriouslly doubt that 1000gr of thrust in spec sheets would be lifting capability but more "suited for a 1000gr airplane model", so it accelerates untill it has a speed where air can sustain the weight. I see spec of motors with 1200gr thrust with a 10" prop... put 4 of this on a quad and see if you can lift 4800gr :)


Developer
Comment by Marco Robustini on February 24, 2012 at 5:01am

Ecalc work fine, when I designed my X8 got it right:

Comment by Chris Gough on February 24, 2012 at 4:45am

Pay attention, sometimes motors have in their specs the thrust, but it's not lifting thrust but horizontal thrust (for planes)

??? I thought thrust was thrust.

motocalc works well for me.

Comment by Rui Manuel Cravo Marques on February 24, 2012 at 4:38am

Gjango, I don't know if you're familiar with this site : http://www.ecalc.ch/ 

The thrust depends on several factors : motor power, motor kv, propeller used. A 100w motor with 800kv and a 13" propeller will give you less thrust than a 300w motor with 800kv and a 13" prop, since the last one will be able to maitain higher rpms with such a "eavy" prop, but the motor will also be heavier. Pay attention, sometimes motors have in their specs the thrust, but it's not lifting thrust but horizontal thrust (for planes)

Comment by Gjango on February 24, 2012 at 4:28am

hi to all

How can I calculate the thrust produced per motor in kg?

Comment by Ellison Chan on February 18, 2012 at 10:36pm

Well, 850kv @ 20amp would probably generate over 1kg thrust per motor.  So your flying weight with the gopro is over 4 kg?  That does seem like a heavy drone.  If you're really over 4kg, you should probably be looking at a hexa or octo.  Since if you try to find motors for a quad that can lift greater than 4kg, you're talking about expensive motors and escs.

Comment by Adli Shahnaz on February 18, 2012 at 10:06pm

Elison, 850kv with 20amp ESC. I just transferred from the normal jdrones ardu frame to the X1 frame. Should I change the motors and the ESC?

Comment by Ellison Chan on February 18, 2012 at 10:02pm

Adli, what kv motors come with that frame?  12x45 sounds like they're big for a 20amp rated motor..  Adding another battery in parallel will likely make the lifting ability worse, since there will be the extra weight of the battery added to what you say is an already heavy drone.

Comment by Adli Shahnaz on February 18, 2012 at 9:46pm

Hi guys,

Can I add an extra battery to the arducopter?What do I need to do in order to do that? Help please. Right now, I am using the JDrones X1 frame with 20amp of motor and 12 x 45 props. It seems  a little bit heavy to lift with gopro attached to it. Thanks.

 
 
 

DIY Drones Monthly
Newsletter

Groups

Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Vertical Horizontal one, is here

© 2016   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service