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HelicopterMain Discussion › CF blade damage
10-26-2009 12:00 AM  8 years agoPost 1
FlaG8r

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Florida

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After a minor crash today one of my blades have separated on the trailing edge. You wouldn't notice unless I split it apart. Can this be repaired? Thank you.

Life is tough, it's tougher if you're stupid

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10-26-2009 12:09 AM  8 years agoPost 2
Heli 770

rrProfessor

USA.

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That looks more like a manufacturing defect, except for the little crash.

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10-26-2009 12:09 AM  8 years agoPost 3
Rob43

rrKey Veteran

Midland, MI USA

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If it were mine, I wouldn't

The reason the trailing edge separated is that the blade buckled due to impact. I have seen this as a primary failure mode caused by blade strike. While you could perhaps use epoxy to re-bond the trailing edge, you can't really diagnose stress fractures in the carbon weave which could fail unexpectedly. Simply the vibrations of routine flight could propogate the fractures if they are present. Too much risk IMHO.

Best wishes.

Rob

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10-26-2009 12:09 AM  8 years agoPost 4
FlaG8r

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Florida

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That looks more like a manufacturing defect, except for the little crash.
Repairable? It was not like this before the crash

Life is tough, it's tougher if you're stupid

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10-26-2009 12:12 AM  8 years agoPost 5
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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That looks more like a manufacturing defect,
yeah, your right, it didnt survive the crash

Shawn
Team Leisure-Tech
Team HelixRC

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10-26-2009 03:02 AM  8 years agoPost 6
chopper_crazy

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Delphos, Ohio

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I would never risk an expensive heli with damaged blades no matter how "minor" it is.

It's a complex, costly, glow powered anti-gravity machine!

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10-27-2009 01:27 AM  8 years agoPost 7
FlaG8r

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Florida

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Finless mentioned over at HF he repairs these all the time with some epoxy...sounds good to me

Life is tough, it's tougher if you're stupid

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10-27-2009 01:47 AM  8 years agoPost 8
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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if you want a real good bond, use paper glue, either bottle or stick form works great. just make sure you clean the surfaces by spitting on it and giving it a good rub.

Shawn
Team Leisure-Tech
Team HelixRC

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10-27-2009 01:51 AM  8 years agoPost 9
FlaG8r

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Florida

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Paper glue? Like Elmers?

Life is tough, it's tougher if you're stupid

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10-27-2009 03:29 PM  8 years agoPost 10
alchemist

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Auckland,New Zealand

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What has happened is the blade has stuck the ground and bent back forcing the trailing edge to delaminate. If you bend the broken blade back hard enough you should be able to re-create the opening of the two laminated CF surfaces (this is easier to demonstrate on a fully bused blade).

Depending on the severity of the damage you maybe able to fix it as suggested with epoxy? The question is are you prepared to risk it with your flying money pit?

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10-27-2009 03:36 PM  8 years agoPost 11
VooDooX

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San Francisco Bay Area CA, US (San Mateo)

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...bad idea replace blades use these for stirring sticks!

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

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10-27-2009 03:39 PM  8 years agoPost 12
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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you can't really diagnose stress fractures in the carbon weave which could fail unexpectedly.
+1. Cut it in half so you won't be tempted. Don't breath the dust, or smash it with a hammer.

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

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10-27-2009 09:18 PM  8 years agoPost 13
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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give it a place on a home made wind generator!

i did that has a project for my gr12 high school Physics. i used a spare rotor head, spare wood blades, used the main gear, put the pinion on a DC motor, and put it all on a stand.

Shawn
Team Leisure-Tech
Team HelixRC

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10-28-2009 06:53 PM  8 years agoPost 14
Zaaaguy72

rrElite Veteran

MN

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I would not use it either. With the headspeeds and strain put on the blades during flight, you dont want to risk getting somebody hurt.

Team Sanjel!

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10-28-2009 08:11 PM  8 years agoPost 15
ccpm raptor

rrApprentice

Delaware

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Go ahead and fix them that way you can order more parts after they fail (agreed cut them in half)

Srimoking

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10-28-2009 09:02 PM  8 years agoPost 16
outhouse

rrVeteran

auburn ca

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just for giggles i'd ca them up really good. let dry overnight.

then i would flex and twist and bend right to the breaking point just to see how well the repair holds up.

depending on what size heli before i'd think about flying. if it was a 450 i'd throw thow on beat the snot out of them. if it was my 600 I dont think i would.

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HelicopterMain Discussion › CF blade damage
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