Difference in blade weights

[Grees01]

Hey Guys. I just bought a spare set of 556 mains and 96 tail blades from Amain Hobbies. There are some minor paint blemishes on the 566 which I don't like but could live with, but I checked the weight on my AWS AC Pro-200 scale of the mains, and have a .7 gram difference between the two.  One blade weighs 118.24 and the other 118.96 That's a lot in my opinion. I'm thinking to return these to Amain hobbies for an exchange, but just wanted to ask for a little feedback before doing so. Thanks.

[curmudgeon]

I too use the AWS AC Pro-200 scale.  Goes down to 2 decimal points.  Very accurate.

Just on weight alone, as long as the blades weigh within 1.5% of each other, they should not cause any issues.  Your blades weigh within 0.61% of each other.  As long as the chordwise and spanwise COG are pretty well matched, I would not bother making any weight balancing alterations.

[Mike Spano]

post a pic of the paint issue you are talking about please so we can see.

that amount of weight is not going to be a problem. I don't even bother to check my blades anymore unless I see something is wrong. its usually something else anyway, a bent shaft or something.

[Cliff Chmiel]

I would send them back, if cg is off the with length  wise you can"t fix it, you balance this with each other and length, drive long finishing  in to the wall hang both blades, they have to hang together, if one leads the other DO NOT FLY THEM. like cg off in a airfoil too far back towards trailing edge mean real problems blade lead lag will not match the other blade, and it will shake like you have never seen before. I just went threw this with my scale ship almost destroyed it

[Mike Spano]

I would send them back, if cg is off the with length  wise you can"t fix it, you balance this with each other and length, drive long finishing  in to the wall hang both blades, they have to hang together, if one leads the other DO NOT FLY THEM. like cg off in a airfoil too far back towards trailing edge mean real problems blade lead lag will not match the other blade, and it will shake like you have never seen before. I just went threw this with my scale ship almost destroyed it

he didn't say that CG was off...

he only said the overall weight was off by 0.7g, which is almost no weight at all. they will be fine.

[Cliff Chmiel]

Funny because I have never received a set of rail blades that I had to balance, and I do check every set I have they all were perfect. Makes me wonder, balance them see what happens

[Cliff Chmiel]

I have changed my scale ship from ccw to cw so I could run the 766 blades, ccw Vairo blades almost destroyed my 222, they wear way out on cg length  wise never try that again, I will stick with the rail

[Mike Spano]

I was thinking the same. never had an issue with rail blades at all ever. crazy.

[Grees01]

Hi guys. Thanks for the feedback. I've been slammed busy at work the last few days. I'm off this weekend and Monday too so I will take a few pics and try to capture the minor paint blemishes and a shot of both blades on the scale. I called Amain hobbies and spoke to a guy named Graham who in turn reached out to Jason Bell for some feedback on what is an acceptable degree of difference in weight on a set of blades. Seems like there isn't really a standard for reference, which I find rather hard to believe. It was suggested that I fly them and see how they fly. If there is any issues or if I just feel dissatisfied with the weight difference they will be happy to exchange them for me. Only other little problem is that they are currently out of stock. Should have more within a few days. Also both sets of 566's that I have bought have came without the plastic washers. What's up with that. It would be nice to hear from Matt on the blade weight issue. I'm sure the manufacturing facility has some standard that need to be adhered too. Would be good to know what that standard is.


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[Grees01]

Here's some pictures. Unfortunately a bit windy here for flying today.


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[Grees01]

Hey guys, Only had Sunday off this weekend and it was windy here. I did pull the first set of Rail 556 blades off the E5 and check the weight for comparison purposes. The first set weigh 109.93 and 110.24 which is a difference of .29 grams. Not so bad, in comparison to the set in question at 118 .97 and 118.25 difference of .72 grams. Not so good. I did not mount them on the helicopter and fly as I had very little free time today. But between the weight, the small cosmetic paint stuff, and no washers, I'm thinking to return them for an exchange. I don't know why neither sets of blades that I have purchased have came with the little plastic washers? Does any have some spare washers they can part with?

[Wolf51]

I've bought 3 sets of 556 Rails in the past and none had blade washers in the pack.
Recently I bought a set of 626s and they came with blade washers.
I have no idea why some blade sets include washers and others don't.

[Rodney Kirstine]

Only the 606 and longer Rail blades come with blade spacers.

[Grees01]

  And you can not buy the washers separately? Other options?

[Chris Sexton]

They come with the e5 kit new. That said. I have a ton of extras. Shoot me your address in a PM I'll send you some.


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