I don't think I need to add much to this. Perhaps handles ought to become standard though.

Views: 1838

Comment by Johannes on May 28, 2014 at 9:12am

Well, mine has $9 Motors which have been eating dirt and mutt on their first live on my testquad.

By the way, i have the C-Clips removed on the Motors as i had to turn the shafts. That way i can pull of the whole bell incl. prop to clean them.

Comment by Gary McCray on May 28, 2014 at 9:58am

Salt water is a killer, you really need to add an additional layer of epoxy to the windings and switch to expensive ceramic bearings (cost more than the motors), but even then tiny little sand grains are hard on them.

Bigger motors with bigger bearings work better, but nobody wants to stick those in salt water either.

Comment by Alejandro Garcia on May 28, 2014 at 10:12am

careyer, just using water won't work, you need to flush the motor and bearings with WD-40.

I've dunked brushless motors many times, in fact I have a FPV plane that is made to land on water (not a seaplane) so pretty much every landing the motors get wet, by using WD-40 you keep the motor, windings and magnets from rusting, but the bearings will have to be replaced sooner or later.

Comment by careyer on May 28, 2014 at 11:42am

@McCray: Problem with ceramic bearings is: Their specs only allow very low RPMs (about 2000-5000rpms - that is way to low for a multicopter) + they are expansive like hell + it is difficult to get very small ones e.g. for motors in the 220x class.

@McCray: You are lucky just having one motor on that water-plane. Chances that you need to change a motor/bearing on a multicopter is at least 4 times as high :-/ - Experience teaches me: Whatever you do... you certainly must revise at least one motor which is btw. a real pain on my DeX Frame.

Best thing you can do is: Choose cheap as beans motors and mount them in a way that lets you replace them quite easily. And always have a trashcan nearby =)

Comment by Gary McCray on May 28, 2014 at 5:38pm

@careyer, actually talking about quads.

I avoid saltwater like the plague even though I live on the coast and I was actually thinking of silicon nitride bearings which are good at high(er) speed (and cost even more).

However, I also agree, if you actually do have to fly in salt water environment, bigger slower motors with big bearings (preferably silicon nitride) and using a lot of good anti corrosive stuff like BoeSheild is the best way to go.

Tiny little steel (even stainless) bearings are very rapidly destroyed by saltwater due to galvanic action.

Really you need to immediately total immersion flush them off with freshwater and then a serious flush in mineral spirits would be good followed by lubricating them with whatever you lubricate them with, (WD 40 is really inadequate as a miniature ball bearing lubricant).

One of the tricks of immersible motors even brushless ones for submersibles is that normally they use self lubricating bushings rather than ball bearings.

Comment by Jon on May 28, 2014 at 7:50pm

Jake has built a few boxcopters as well http://www.youtube.com/watch?v=ZN61RANENGw

Comment by Vladimir "Lazy" Khudyakov on May 29, 2014 at 2:19am

Very funny ! :)))


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