ORIGINAL: grado325
ORIGINAL: goldslinger
I've had it where My heli was almost unflyable just grabbing two out of a box of mixed.
Yeah, that's how mine was.
I'd read all the stuff about boiling the blades, balancing them etc but to be honest I figured it was probably heli fanatics that had to get THE perfect hover. Keep in mind I'm new to this. I never figured it would be a legitimate concern.
I can see the blades being a bit warped, cool too fast to slow whatever but I would have figured the weight would be constant as long as the molds are all the same.
I'm believer now, that's for sure.
That's just it, the molds are not all the same. I use to machine plastic injection molds for Preston Petty Products. PPP was the company that made all the plastic dirt-bike fenders, numberplates, etc. that everyone used back in the 70's.
Molds are finish polished by hand and individual mold cells can vary a few .000" from one to the next. That small amount can cause significant weight difference for something that requires the kind of precision needed for blades on these small helis. If you are a shooter and have reloading scales or some other scale that will measure very light weights then weigh some blades, you'll be surprised.
My experience with four different CX2's (family/friends) definitly indicates changing blades that are significantly different weights causes seriously different flight characteristics from what the prior blade step-up used. Think about that for a minute, if you don't have balanced blades when you first tune your CX2, how can you expect it to fly the same when you break blades and randomly select replacement blades. If you start with balanced blades, when you break one and replace with balanced blades your tune will hold, or at the worst be very very close requiring minimum re-tuning.
Those who claim they never balance blades and their heli always flies the same have been blessed with some kind of "fairy dust" or some other magic
