In my previous quad project I had already found a cheap, simple solution for creating a diy motor mount that reduces vibration. Now I adapted it for my current Y6 project. The only difference lies in the fact that the quad had square arms and the Y6 round arms. For those who might be interested, I have created a small how-to.
Comments
Very nice design.........
Regards,
UNMANNEDENGINEERIA
I'm wondering how people how balance props do so in an efficient and reproductible manner. I tried and failed. Although I spent 25$ in a supposedly professional magnetic prop balancer, I never could find a reproductible balancing measurement with a specific prop. You just need to turn a bit the locking nut of the prop on the balancer to measure another imbalance on the same prop.
Furthermore, even the least single dent on the prop or on the side of a prop will unbalance it because of air flow disturbances. I'm not sure that sticking a piece of scotch tape on a prop would improve vibrations whatsoever because other relatively more important factors creat vibrations anyway.
I still need to be demonstrated how a prop balancer can effectively be used in a scientific reproductible manner. Eventhough I tried to follow some youtube videos, it does not work when I try it myself.
In that context , "rigid" enough isolation of motors do improve things (like hard felt pads or hard rubber). Of course soft isolation (like silicon gels or soft rubber) would definitively be a bad thing.
@ John Arne Birkeland - As Wipo won't argue the mount issues I will. Give up on the solid mount demand. As - a trained and professional engineer - and as - a home mechanic - ex-biker and busybody.... Nearly all things with motors are mounted with some isolation. I have good proof below for vibration mounting motors. But, I am not too sure of the rubber nib mounts. It seems they will prove to be very flexible under extreme flight stress and cause flight issues. They may likely be good very for easy FPV and photo use though. I expect the Op's flight tests will prove their worth.
As to vibration mounting motors. I use hard felt pads to good effect. See the results below from a five minute slow hover flight around with hard bounce landings.
spending $20 for a prop balancer is not really the problem. It' more like a time issue or just call it laziness :)
My motor mount gives me good results on reducing noise (vibrations) even with unballeced props.
I'm still a noob when it comes to flying and controlling a multicopter so on regularly basis I have to change a broken prop. This way I can just take some prop out of the box, don't have to spend time to balance, and replace the broken one. A second issue is that I use cheap low quallity hobbyking motors and prop adapters with shafts that are not always 100% straight.
I understand that buying high quality motors/props/adapters, balance props,... will always give beter or the best result but when you don't have that there are still other solutions :)
Wipo you should definitely get a prop balancer. If $20 is too much, you can make one. You can buy a simple $2-3 balancer assembly, then create the stand with any material. Mine is a magnetic balancer made with 1" wood. It uses some powerful magnets (bucky balls in my case) to suspend the balancer.
@John Arne Birkeland: thx for your detailed comment. From my side I'll not argue on what is the best way to isolate vibrations. I created these motor mounts because I (like many others) do not have a prop balancer. For me these motor mounts were at that moment the cheapest, easiest, quickest way to reduce the vibrations. And it works really well (see graphs on my quad blog). Like I said, maybe not the best way, but it does what it is made for.
Wipo, first of I am not attacking you or anything. But the topic of using vibration dampening on motor mounts is a pet peeve of mine. In my opinion dampening the motors is fundamentally wrong.
Think of it like this. In a multicopter system you want to prevent vibrations from occurring at the source (motors), and then isolate the critical parts (autopilot sensors) from the left over vibrations that you could not prevent.
So you balance the motor and propeller as best you can, but there is always some minor vibrations left and external ones created by forces put on the propellers during flying that you want to prevent.
And the best universal option to reduce vibrations is to strap the vibrations source to a rigid mass, so that the mass can fight the inertia and reduce vibrations as a result. And in our application the mass is the copter frame and rigid arms as a whole.
By using motor dampeners you decouple the motors from the copter mass, allowing them to vibrate more easily and at higher amplitudes. And those high amplitude vibrations will put excessive stain on motor and propellers, and eventually traverse the motor mount dampening and travel into the frame.
@Daniel Allen: see videos on my quad blog, quad is flying great. Y6 is flying even better :) I'll upload video asap. My motors only provide max 700 gr of thrust devided by 4 rubber dampners is only 175 gr of pull per rubber. That is not much. If you got motors that provide more thrust you can just add extra rubbers.
Wipo. Your design is good, however I'd be wary of the amount of flex these dampeners give. Especially with the top motor pulling hard on the rubber. Those things are made for computer fans.
naish88 - Your design is good, However I'm curious how you're going to bolt the mount to the grommets.
I shared this photo/blog on the DiyDrones Instagram account http://instagram.com/diydrones. I'm going to start getting the social media accs back up and running 100% for everyone who has them added on your non Diydrones.com Social Networks.
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