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HomeAircraftHelicopterMain Discussion › have you fixed a main blade?
04-28-2010 03:17 AM  8 years agoPost 1
alexz

rrApprentice

shakopee mn usa

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Has any one fixed their main blade that got a gash in it like this? If So how did you do it, and did it work?

I'm thinking on trying to fix this blade. As is it's lateral flex still feels as strong as the good blade. The torsion flex is stell strong but dose flex a little at the gash. But you realy have to twist it to see it. So I'm thinking ones that gap is filled in with some good epoxy that it'll stop that.The balance of the blades will be off a bet. But I think that it wouldn't be something that couldn't be fixed with some tracking tape.

Any ideas?
I'm thinking that first I'm going to fill in the gap with some expanding foam. Sand that to mach the profile of the blade and then put a good coat of epoxy over that. Sand that to shape and then see how the torsion flex feels. Also see how bad the balance is.

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04-28-2010 03:23 AM  8 years agoPost 2
freakyreef

rrKey Veteran

Kansas\Colorado border

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Get rid of it.. I trashed a set for less than that.
Just not worth it. While it looks like minor damage, who knows what damage is internal till it gets up to around 2k rpm.

Walk on water long enough, eventually you will get your feet wet.

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04-28-2010 03:24 AM  8 years agoPost 3
Dirthead

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Thornton Co.

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You cannot "fix" any main blade!

Keep ur head out the dirt only in the grass

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04-28-2010 03:31 AM  8 years agoPost 4
Swoop

rrElite Veteran

Newark, DE USA

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ooh thats a nasty one, get rid of it.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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04-28-2010 03:35 AM  8 years agoPost 5
VooDooX

rrElite Veteran

San Francisco Bay Area CA, US (San Mateo)

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use as a paint stick and dont be wreckless could fly off and impale someone

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-28-2010 04:02 AM  8 years agoPost 6
alexz

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shakopee mn usa

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How do the blade makers test their blades? Has any one set up some kind of a test head reg that can safely spin the blades at fling speeds and with everything stell there on the head, can pitch pump the blades to death if they wanted to.

How about a blade making company that can sell singe blades. Or send your good blade to them and they can match one to that.Or if the damage to your blade can be fixed that they could offer that for a price less then a new one.

Could I send my good blade back to Maverick,and dose any one now if they have done this?

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04-28-2010 04:48 AM  8 years agoPost 7
nickt919

rrVeteran

New Orleans, Louisiana

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Most likely there are stress cracks you cannot see. ...and, just spinning a blade up to rpm is not enough to test it. A blade gets a work out in flight. IF.... it does break off close to anyone at flight rpm lots of stiches may be necessay to fix the next crack.
As hard as it may be to get rid of that blade it may save you lots of heartaches later. At the very least it may take out your heli when it comes apart. I'd get a new set.

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04-28-2010 05:12 AM  8 years agoPost 8
ShuRugal

rrKey Veteran

Killeen, TX

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cant repair carbon fiber. The strength of the blade comes from the unbroken, continuous stands of carbon which run the length of width of the blade, giving it nearly untouchable tensile-strength. But once the strands are damaged, the whole thing can come unraveled.

You cannot stress-test a rotor blade with your bare hands and hope to come close to even a fraction of the load it will take in flight. the blade will be under several hundred pounds of linear tension, as well as constantly changing torsional and perpendicular loads. There is no way short of high-power computer modeling to simulate the kind of forces a rotor blade is subject to.

this is not a looks-only body part. Your "expanding foam" fix will last about as long as it takes the foam to cure, the first time you spin it up, the expanding foam will fail from the stress.

AMA 700159

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04-28-2010 06:01 AM  8 years agoPost 9
alexz

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shakopee mn usa

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So has any one been able to send their good blade in to get a match for it? Really it would be nice to have that option. Being that damaging one blade and not the other is pretty common.

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04-28-2010 06:11 AM  8 years agoPost 10
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..

If you've ever seen what happens to a heli when it sheds a blade in the air...You won't try to fly this one again...EXTREMELY dangerous.
Good luck with finding a matching blade...you might get lucky with a new set, but my luck over the years has been poor....

John.

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04-28-2010 06:11 AM  8 years agoPost 11
The man

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at home

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Do not even try to use or fix that blade. Keep the other blade and if you happen to damage one blade from another set, then you can try to balance both good blade.

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04-28-2010 06:22 AM  8 years agoPost 12
Ray Fernandez

rrElite Veteran

Guam (U.S.A.)

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Don't go cheap. Your blades are toast. Extremely dangerous. Don't take a chance on them. Replace, Replace, Replace......

Ray Fernandez - GUAM

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04-28-2010 08:24 AM  8 years agoPost 13
Hamo

rrVeteran

Ireland

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If you must, try fine wire mesh with 5 minute epoxy, let it set overnight and sand it to restore the shape as close as you can.
Then you'll have the job of balancing the blades. Good luck.
Hamo

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04-28-2010 10:44 AM  8 years agoPost 14
F3CWNB

rrVeteran

Napier, New Zealand

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DUDE

I know a guy that "Fixed" a main blade; He was hovering about 50 feet away when the blade let go and stabbed him in the chest, missed a main artery by millimetres.

He has not flown a Heli since...

Go outside now & Cut the blade through the mounting hole...

'Life' is Looking Up!!!

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04-28-2010 11:45 AM  8 years agoPost 15
ChrisMoore

rrApprentice

Bay Village, OH

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This is probably the only thing that all helicopter pilots on RunRyder agree about. Get rid of it.

Chris. AMA 497715 IRCHA 3351

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04-28-2010 12:29 PM  8 years agoPost 16
red_z06

rrProfessor

Dumont, NJ

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So has any one been able to send their good blade in to get a match for it? Really it would be nice to have that option. Being that damaging one blade and not the other is pretty common.
If you fly X brand only, then it is worth keeping the good blade. Eventually, you will end up with more orphan blades that you can match up with and balance. Ask the company if they match orphan blades.

SWE rotors will match orphan blades but due to shipping costs, you will have to collect few before sending to Korea for matching.

Any blade that has even a hairline stress crack is no longer fit to perform. If you wish to repair it and re-balance the blade, it should be tested in a safe lab environment with shield to protect from projectile. Fixture should be able to handle 50% more RPM (3100rpm for 90size) and pitch cycling from full + (+20deg)to full - (-20deg) at this RPM for at least 500 cycles.

Most likely, the blade will either shoot out or crack at the repair during the fatigue testing.

If you fly by yourself from a private field with no one in 1000' radius, you can skip the lab testing. But, I suggest you wear a body armor and heavy face and neck shield every time you fly the repaired blade to protect you in case the blade decides to let go.

www.JustinJee.com

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04-28-2010 01:13 PM  8 years agoPost 17
bkervaski

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Birmingham, AL, USA

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Not worth the safety risk, replace it.

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04-28-2010 01:25 PM  8 years agoPost 18
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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have you fixed a main blade?
Yes I have.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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04-28-2010 01:50 PM  8 years agoPost 19
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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The leading edge has 70% of the strength, and you have lost that part. As others has stated, trash/cut the blade so you won't be tempted.
Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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04-28-2010 02:21 PM  8 years agoPost 20
oteskate

rrApprentice

Long Island, NY - USA

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Definitely get a new set of blades, man. Not worth the risk of injury to yourself or anyone else for the sake of saving some $$ on a new set.

Always check over your blades before and after a flight and never underestimate any cracks, nicks, etc. They can cause a catastrophic failure in flight that could lead to horrible results.

Jeff
Team Hirobo/MRC, KBDD, RC Booya, Switchglo, JGF, Castle Creations, Magnum Fuel

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