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  • Bad Raven: Balance lead extensions are pence from China, I bought bulk. I also cut the old balance plugs with lead off and if I get a broken plug body I just solder a new one lead to lead, can extend at the same time.
    Today at 14:17:22
  • Reman: Bajadre, With reference to balance leads, I bought a cheap JST XH crimper, plus a shed load of male/female plugs and pins a while back. It's amazing how many times that lots come in handy. Not just for repairing battery packs, But for things like adding quick release plugs to wiring harnesses so you can do things like pop gimbels on and off camera drones quickly, Or add plugs to the cables of hardwired components so you don't have to desolder them when you need to get them out of the way in a rebuild, And making charging extension leads so you can get the battery right into a Li-Po safe bag and away from the expensive charger. They're well worth adding to the toolbox..... The other day I only spent about 5 minutes hunting for my 4S charging lead before giving up and making a new one. If I didn't have the crimping kit I'd probabbly still be looking. :)
    Today at 14:00:55
  • hoverfly: Not unusual Reman, they just cant be ar$ed to deliversome if they get behind schedule.. Yesterday i had a delivery by Herpies,  got a sms telling me when they were going to deliver, then rang the door bell and knocked. The parcel was intact and damage free.  Not sure what is going on.... :hmm:
    Today at 13:23:11
  • Bad Raven: Where is it broken?
    Today at 13:22:29
  • hoverfly: If you cut them off make sure  you insulate the ends. :smiley:
    Today at 13:18:42
  • Bajadre: Quick question guys is it ok to snip off a broken balance lead and not run it i know i wouldnt be able to balance charge it again but would the pack be ok ? its a 3s 5500mah which the lead got dragged along the floor on sundays bahs :(
    Today at 12:44:55
  • Reman: About an hour ago I had the Yodel tracking system tell me that I wasn't in...... That's f*ckin' news to me !!!!!
    Today at 10:17:20
  • Reman: Like I said, In the past I've had a handful of packs "Go off" at me like fireworks after bad crashes (Usually with RC helis), So it's hard to get that image out of your head while stripping down Li-Po's. :)
    January 21, 2019, 11:22:54
  • shawdreamer: the horror stories will always incite worry when messing about with Lipo's but its the same as everything else when working on electronics alike, alsong as your careful and methodical there's very little to panic about, I regularly recycle 4s's with a single dead cell into usable 3s packs, end of the days its alot more economical, safer and enviro friendly than having to bin them....just a pain that the dead cell is NEVER one of the outer cells so you always end up having to strip a good cell off to get at the bad cell before putting it back afterwards, its like dropping toast, it'll always land buttered side down and inevitably covered in pet fur :angry:
    January 21, 2019, 00:11:16
  • Reman: Just did the one electrical job that still scares me. I dismantled some Lipo's with knacked cells and built usable packs out of the good cells. I've had packs go "VOOOOOOSH" at me in the past so I'm always slightly scared of having bare lipo contacts anywhere near what I'm working on, But all appears to have gone well and one of them is currently doing a charge/discharge cycle to make sure nothings a miss. :)
    January 20, 2019, 22:28:43
  • Reman: My original Dremel Pro made it to 14 years of heavy weekend use (And abuse) before it crocked. Dismantled that but it turned out to be a "Control module" fault, And Dremel made it ni on impossible to get into that without pooching it completely. :(
    January 20, 2019, 22:17:27
  • ched999uk: BR  ::)
    January 16, 2019, 22:26:54
  • Bad Raven: That's a warrnty claim if ever I heard one....
    January 16, 2019, 20:32:55
  • ched999uk: My 28 year old 12v 35w Weller soldering iron failed  :( I didn't fancy forking out £100 for a new one. Stripped it down and found conductor snapped in cable. 10Mins later all back working great. :smiley: ::) I am very happy!!
    January 16, 2019, 17:23:06
  • shawdreamer: "look up there....its a drone!.....and whats this noise?..... no.....no..... it cant be!....NOOOOOOOO.......OOOOOOOOOOOOOPS I DID IT AGAIN, I PLAYED WITH YOUR HEAR....."
    January 10, 2019, 14:17:24
  • shawdreamer: <starts downloading britney spears albums and preping his large frame to carry a PA system>
    January 10, 2019, 14:15:08
  • Bajadre: defo steveo :) we should get loads of drones together up there so how they handle more that one lol
    January 08, 2019, 19:39:07
  • steveo9007: its all a ploy to get who ever has won the contract for geofencing the airport in, i reckon  ::)
    January 08, 2019, 18:38:26
  • Bajadre: more lies hope they prepped the police staement already lol
    January 08, 2019, 18:27:49
  • Bad Raven: Take Offs resumed
    January 08, 2019, 18:24:45

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Author Topic: Balancing Blades  (Read 2680 times)

Offline Bad Raven

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Balancing Blades
« on: December 10, 2015, 11:25:40 »
Been around RC since 1972, Helicopters since 2006. Currently own more than 20, from 91 powered 3D down to Blade Nano CPX.

Have always bought budget but "named" blades for the i.c. ones, often Thunder Tiger.  The rest get OEM sourced blades or named replacement buys. In all that time I have never balanced any blade pair nor felt the need to.

I now fly with a small group weekly indoors, and notice that their blades are covered with strips and squares of "balancing" tape, and some have been spraying clear varnish on to balance. It is seemingly a topic of frequent conversation and complaint, especially on Blade heli';s. 

The only reason I have changed blades is to make the colour more suitable for the use (though I';ll admit to putting white blades to main and tail on the MCPX just before a period of snow which was not ideal!!  :rolleyes: )

I must be a really lousy pilot as I have never noticed blade imbalance, and I have Nano, MCPX, 130, 180, 230, all unbalanced by me............... So, is it me?  :shrug:

Do you balance your blades? Static or Dynamic? What measurable improvement or solved problem do you achieve?

Offline Two-Six

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Re: Balancing Blades
« Reply #1 on: December 10, 2015, 12:00:33 »
UG!

Balancing small blades is really really hard.  I have 4 blade rotor balancing devices now, one is home made.  The only way to balance small rotors blades like the MCPX';s have is to bolt them together and let the bolt pivot on something.  That';s pretty good but still not accurate enough.

My MCPX-BL has had random severe vibrations that I so far can';t sort out.  I was using "upgrade" blades from Blade and another manufacturer...Both the same, I haven';t tried it with the stock blades for a while, I am hoping that will sort it out.  If its not the blades then its the non standard "upgrade" main shaft I have or the "upgrade" swash plate that';s wonky....I dunno.  Its quite random when it goes shaky.  Its very annoying.

I have just bought a little magnetic prop balancer and that is probably the best device I have for small rotors like on my quad, its pretty accurate.  I use fine sand paper on the back of the blades to get them to balance.  All the rotors I have needed balancing and the difference was noticeable afterwards with no vibration that I could feel when revving up my quad.  So I think that worked and it was worth it.

With my helicopters I have a heli blade balancer which is pretty good.  I do think it is worth at least trying to balance your rotor blades, at least have a go at checking them, they might be way out.

I wouldn';t advise using sand paper on composite heli blades, tape is the way to go.

One thing I have seen on youtube is using a smart phone with  a vibration detecting app, that looks like a good way to go, or using a laser pointer and a  reflective thing.  Fit the reflective thing onto you frame, shine the laser on the reflective thing, observe the reflected dot on the wall, rev it up, watch the dot move, add tape until the dot stays still.....
« Last Edit: December 10, 2015, 14:18:25 by Two-Six »
Nighthawk Pro, Trex 450 L Dominator 6 cell *FLOWN*, Blade 450-3D, MCPX-BL, MCPX-V2, Hubsan X4, Seagull Boomerang IC .40 trainer, HK Bixler, AXN Clouds fly,, Spektrum DX7, Taranis, AccuRC

Offline jamesb72

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Re: Balancing Blades
« Reply #2 on: December 10, 2015, 12:22:01 »
I';ve always balanced heli blades - you have to add tracking tape anyway (do you not do tracking either ;)

I do it with microscales (0.01g scales from ebay they are about a fiver) and a metal ruler, takes a couple of minutes to balance a set of blades, and works fine on everything from MCPX up to 550.

Weigh both blades, stick tracking tape on the lighter blade, check CofG and mark with a pen on Leading edges, then you just add a bit more tape to even up the weights, if the CG between blades match then add it on the CG mark, if not then adjust tape position to match CG between the blades. Lastly check CG and weights both match, then fly.

I';d say 9 times out of ten the blades need balancing, so I do wonder how badly your heli';s are flying/vibrating ;)



Offline Bad Raven

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Re: Balancing Blades
« Reply #3 on: December 10, 2015, 12:31:20 »
I do tracking.............under duress..........   ;)

Offline Two-Six

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Re: Balancing Blades
« Reply #4 on: December 10, 2015, 14:17:36 »
Jamesb72,

 I had forgotten about how to do that ruler/weight/tape thing. 

I am going to give it a go again and see what happens.  I think I found it hard to weigh my small rotor blades, just getting them to sit on the scales right the last time I tried it.  I seen to remember the indicated weight varied quite a bit....

I did really have a go at this once but perhaps I did it wrong, it didn';t seem to help my wobbles at all, it made them worse if anything! 
Nighthawk Pro, Trex 450 L Dominator 6 cell *FLOWN*, Blade 450-3D, MCPX-BL, MCPX-V2, Hubsan X4, Seagull Boomerang IC .40 trainer, HK Bixler, AXN Clouds fly,, Spektrum DX7, Taranis, AccuRC

Offline jamesb72

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Re: Balancing Blades
« Reply #5 on: December 10, 2015, 20:03:20 »
0.01g scales are the trick. They make it super easy. I should stick a video up on it sometime.