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Old 02-07-2018, 05:27 PM   #1 (permalink)
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Default Need help w/14g difference between blades

I have a 5-blade MD500 project I'm working on. Mechanics is a Trex600 PRO w/a pnp Roban head. I ordered 3 sets of blades and got weight differences that bummed me out. I'm stuck w/the blades because I painted them just the other day. Here's the way they came.
Set 1= 153.2g & 153.5g
Set 2= 139.2g & 139.1g
Set 3= 144.1g & 143.6g
I can see if I only use 2 blades I'd be ok. I needed to use duct tape to get an idea of what was needed to bring sets 2 & 3 up to set 1 weight. After seeing the slight weight gain from painting, I now realize I can't put that much paint on the blades to balance them. I think I'm gonna have to chalk it up, and get a matched set somewhere. Unless someone out there has an idea that can solve this dilemma. If not where's the best deal on 600mm, 5 matched set of blades?

Thanks for your time.
Thomas
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Old 02-07-2018, 10:51 PM   #2 (permalink)
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I'm interested in the solution for this. I've got two leftover blades measuring 280 and 288g's. Even 8 grams difference on 800mm blades I find too difficult to solve!
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Old 02-08-2018, 10:50 AM   #3 (permalink)
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Quote:
Originally Posted by Raptorapture View Post
I'm interested in the solution for this. I've got two leftover blades measuring 280 and 288g's. Even 8 grams difference on 800mm blades I find too difficult to solve!
When I painted both ends of the blades, (4 or 5 coats), there was a weight gain of 4 grams. I hadn't painted the center part yet. So if you're not painting the blades, maybe a clear coating is the way to go. I wish I only had 8 grams to deal with.

After thinking on this, I'm going to try multiple coats of paint then the same w/clear coat to see what happens.
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Old 02-09-2018, 05:22 PM   #4 (permalink)
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I use high density lead tape (used in golf) to balance blades.
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Old 02-09-2018, 06:29 PM   #5 (permalink)
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Quote:
Originally Posted by curmudgeon View Post
I use high density lead tape (used in golf) to balance blades.
Seeeeeeee, that's what I'm talking about! I would have never thought of that! There is hope after all. Thank you!

Raptorapture, did you get that?

curmudgeon, that brightened my day. And for that, I give you the claps.
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Old 02-09-2018, 08:25 PM   #6 (permalink)
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In that case, I'll make a few recommendations. When you add the lead tape to the lighter blades, make sure to add it to the correct area to attain a "perfect" chord-wise and span-wise center of gravity. My very favorite tool for this purpose is the Koll Rotor Pro balancer. I thought this tool was discontinued, but it looks like it has resurrected. I found these two sellers that carry it:

1) Cajun Aircraft. I believe these guys are the US distributors for the new XLPower helicopters.

2) Miniature Aircraft USA

This is a weblink to the manual.

This HeliFreak thread discusses the Koll Rotor Balancer.

After taping the golf lead tape, you must secure the tape edges so the tape does not peel off during flight. I used to coat the tape edges with a smidgen of medium CA traced with a wooden toothpick. Of course, add the lead tape to the bottom of the blades to keep the blades looking good.

Good luck with your project.
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Old 02-10-2018, 07:35 AM   #7 (permalink)
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curmudgeon thanks again for the info.
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Old 02-10-2018, 07:44 AM   #8 (permalink)
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Lead tape will become a flying projectile when it comes loose. Simply add more paint to the light blades......
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Old 02-10-2018, 08:59 AM   #9 (permalink)
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I'm going to experiment w/multiple coats of paint to see how many coats it'll take to accumulate 10g - 12g.
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Old 02-10-2018, 10:45 AM   #10 (permalink)
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These are old pictures of the materials I used to balance blades.

This is what the lead tape looks like.





These are the tools I used. Although the picture shows thin viscosity CA, I prefer medium viscosity CA for this purpose.




This is the end result.

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Old 02-10-2018, 03:11 PM   #11 (permalink)
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Looks like the whole chord of the blade is covered w/the tape. Correct? What's the big shiny spot on the black blade?
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Old 02-10-2018, 06:44 PM   #12 (permalink)
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Old 02-11-2018, 07:34 AM   #13 (permalink)
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Quote:
Originally Posted by curmudgeon View Post
What's your best guess of the weight of the lead on the black blade?
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Old 02-11-2018, 07:44 AM   #14 (permalink)
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About 1 g.
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Old 02-11-2018, 07:50 AM   #15 (permalink)
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OK, thank you
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Old 02-11-2018, 01:40 PM   #16 (permalink)
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The root of the black blade looks like a Rail blade and the white one like EDGE. Did these really require 1g of lead at the very root to correct their CGs? Fun-Key blades should be flyable out of the box.
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Old 02-17-2018, 12:14 PM   #17 (permalink)
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I have used Golf Tape for decades, remember to wash up though, it is lead and you will get lead poisoning form it. Painting the blades is the best way for adding little weight, but that much I don't know. Like was said though, make sure to add to the right area to keep the blade CG at the same point on both blades also. I remember getting a set of blades done perfect than wrecking them on a first flight, 2 days to get them right, 5 minutes to destroy them. I now get Rotor Tech blades and am very happy with them. very little work needed to them.
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Old 02-17-2018, 12:18 PM   #18 (permalink)
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Thanks for the link, gonna get one, will save me lots of time, Koll Rotor Pro
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Old 02-20-2018, 03:34 PM   #19 (permalink)
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The blades are too far off to assume I can just paint them to even out the weight. I got the lead tape. If I destroy these blades in the future, I'll be sure to get a better matched set next time.

In order to apply the tape and maintain the same cg as the heaviest blade I'll need to position the tape center lengthwise. Since the tape is going to be approx. 12" long , I wanted to have an end in the blade grip. This will provide extra security to the tape/blade bond. So I'm thinking peace of mind for safety over the technical aspects and effects of the cg of the blades being off but the weight being equal. So, here I go.
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Old 02-21-2018, 12:32 AM   #20 (permalink)
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Don't move the CG. You need to keep the weight in the middle. I checked out the tape. There are two versions, one is heavier by either 2 or 4 times. I was thinking worse case do 2 or three strips and use the opportunity to double check the CG and move to be consistent if already off which my blades are.
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