Chris Mitchell
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Can quadcopter motors be mounted upside down ?

Started this discussion. Last reply by Charles Blouin Sep 21, 2016. 32 Replies

I've noticed on my motors and a lot of other motors that having the motors above the quadcopter means that the max lift capacity relies on the little C-Clip under the motor shaft which leads me to my…Continue

How to re-route outputs 3&4 to 5&6 on ArduPilot Mega quadcopter

Started this discussion. Last reply by Nate Volk Mar 13, 2013. 1 Reply

I accidentally shorted motor outputs 3&4 to +5v leaving my Quadcopter with only 2 working motor outputs(1&2). Outputs 5&6 are still operational and was wondering how to go about…Continue

Tags: motor, reroute, quadcopter

El Cheapo Quadcopter fly's

Started this discussion. Last reply by Dana Geary Apr 6, 2016. 2 Replies

So far this Quad Copter has cost about $350(AUD) to build including the radio gear. I will post a build list soon.I had thought this was going to be an expensive hobby to get in to but have been…Continue

 

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Latest Activity

Charles Blouin replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"I did some tests on RCgroups about this subject specifically. It does not do much difference, but a pusher configuration can be slightly more efficiency from an aerodynamic point of view."
Sep 21, 2016
Dana Geary replied to Chris Mitchell's discussion El Cheapo Quadcopter fly's
"Chris I'm working on a Drone project for a Design class and am interested in mounting the propellers under the motors. Did you decide to go with that configuration and are the any special part requirements or will the [arts list you posted…"
Apr 6, 2016
Matt Shane replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"This is a really old post but I thought I'd chime in any way. There is not as much force on that little c-clip as you might think. We actually had a DJI 450 about a year ago that we flew for almost a week with out realizing that one of the…"
Feb 28, 2015
Ben Carson replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"No doubt this has been addressed, however I just wanted to point out that any idea that there is a "pendulum effect" from mounting propellers above the CG as opposed to below it is a fallacy. Because the thrust vector is fixed and gravity…"
Feb 27, 2015
Tumba replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"Here I found no negative effect: http://diydrones.com/forum/topics/new-quadcopter-zecke-q185-max From aerodynamic point of view a pusher is better, The propeller flow is similar, but the motor is located in the region with less flow velocity. From…"
Feb 27, 2015
Gary McCray replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"With current multicopter motors, there is really no difference at all between up or down, push or pull. The bearings used in all multicopter motors at this point are a simple pressed "Conrad" design and they work just as well with the…"
Feb 26, 2015
Scott M Brown replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"Yes Chris I do it all the time! http://monarchmakers.com/index.html Slightly more efficient, we have noticed a 5-10 percent increase in flight times using this method and as you said the c clip popping off doesn't down the bird! Cheers! Scott…"
Feb 26, 2015
Frank Al replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"Well, I actually fly one of my R&D quads without c-clips all the time. The magnetic force is huge, especially when power is applied. Full power only moves the outer part about half a millimeter. Never have encountered a 'fly-away' of…"
Feb 25, 2015
DB replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"The CG location doesn't matter as far as above or below the lifting points.  It's not analogous to buoyancy because resultant buoyancy is "always up" (in an inertial reference frame) whereas propellers generally push in one…"
Feb 24, 2015
Jon Currier replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"I was trying to say, the prop and outer portion of the motor pops off, saving the prop from breaking."
Feb 24, 2015
Jon Currier replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"Indeed, the magnets hold the motor together. I have flown many times with a motor that had the clip missing. No problems. One side benefit is, on the chance of a crash, the prop amd"
Feb 24, 2015
Cala replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"Thank's for this explanation John, it's a good point :) I'm going to check my cuad"
Feb 24, 2015

Developer
John Arne Birkeland replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"The effect is very similar to how a brushless camera gimbal works. The gimbal motors are fast but have have very little torque, so even if the CG is just slightly off they are unable to stabilize out all movements. The same goes for multicopters.…"
Feb 24, 2015
Rick Boden replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"I can agree with that.  It took a lot of force to pull the motor off when I removed the c-clip.  Can we assume the same magnetic force is in place when the motor is spinning?"
Feb 23, 2015
Rick Boden replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"I found mounting my batteries low on my landing gear caused the motors to work much harder in maintaining a stable flight in winds.  Also hovering was fine in calm air but directional flight proved sluggish and battery life was shorter. "
Feb 23, 2015
Marco Leonardelli Lovatto replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"I am far from being specialist on this, but sharing my thoughts, I'd say drones with neutral stability might have a better maneuverability. About taking less energy to maintain stability, I'd like to understand how, as I thought the system…"
Feb 23, 2015

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About Me:
Full time geek/nerd
www.mitchell-tech.com
Please tell us a bit about your UAV interest
i just like things that fly PLUS i'm lazy so if they can do that by themselves...even better :)
Hometown:
Gold Coast

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Quad copter Autonomous tests

Posted on August 4, 2012 at 2:30am 6 Comments

Suggestions on improving flight are welcome :)

Testing the quadcopter in autonomous modes. I normally fly in Stabilize mode but today we tried switching to loiter and then tried to use the mission planner to "fly to here".

I have some work to do on getting it to fly right, yaw seems to react badly to control, yaw right and it gains…

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