Originally Posted by jasmine2501
It is a good idea to keep your blades clean - it makes a difference.
A long time ago when I was flying a glow powered LMH, the thing all of a sudden lost lift, came down rather hard, and then wouldn't take off. It would get light on the skids, but not take off. Normal hover was around 1/2 throttle. I checked everything. Balance, tracking, RPM, replaced glow head, tried different fuel, etc. All appeared to be just fine. Then while re-re-checking the tracking I noticed that there was a spot on the disk that appeared to stick down just a bit more then the rest of the disk.
Here the tracking tape had come un-stuck from the under cambered part of the blade and the pressure from the spinning disk was pulling it down. (kinda like blowing across a piece of paper to make it raise) When it was not spinning it appeared to be stuck down. Now this piece of tape was only about 1/8" wide. I removed it and the heli lifted off and flew just fine. Hard to imagine that that little piece of tape lifting could kill enough lift to effect it that dramatically, but it did.