There are videos on hub balancing and it may also be in the DuBro instructions.
Because I've seen on this forum a good number of crashes that appear to be related to props flying off, I seldom take mine off. I even bought a case where they can stay on. I'm sure that the internal composite prop threads will eventually reach the end of their service life or get cross threaded. So I just check their hold once in awhile. Seems (in my case) if they're on well to begin with, they don't loosen. If one ever gets scraped, I'll replace it.
Now it makes sense.
Others can explain the airfoil theory, but I prefer balancing a prop by adding a small piece of electrical tape to the underside of blade needing weight. Electrical tape works well because it can be easily repositioned up or down the blade without leaving residue. Clear tape is harder to move (for me) plus my blades are black anyway. I'm just not comfortable with sanding, scraping or adding nail polish to my props. So far I've only had one prop where the hub was so far out of balance that I decided to toss it. Hubs are harder to balance because of the smaller area to work in.
Dont really agree with your statement. Its the higher pressure from below the rotor that pushes up creating the lift. Thats why on a chopper you see the rotors cone as they speed up and begin to provide enough lift for the craft to lift off. Planes and helos are not sucked up, they are pushed up from the bottom. Your illustration does not really apply here. You have pictured a symmetrical airfoil . DJI props are not symmetrical. They are fixed pitch under cambered airfoils. Sanding the props to balance does not decrease lift as long as it is done evenly across the blade. It just makes it thinner. Best not to remove prop material to balance on already thin blades. Tape will work fine on light side. Symmetrical airfoils provide no lift at zero angle of attack. They are best suited for wing design of aircraft that can fly inverted and rotors that have to operate in negative angle of attack as well as positive.Well, lift is produced from the top side of the prop, not the bottom. Sanding the top sides would decrease lift, or make it turbulent depending on the area sanded.
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When I was a kid many years ago and interested in how airplanes fly....I understood how flat bottom wings provided lift but symmetrical wings had me baffled until I begain to understand about angle of attack and how it can provide lift. A flat plank can provide lift but not very efficient.
I found that quite interesting too. Did he forget to mention it?
