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MS Composit › scuffed HII blade...repairable?? PLZ take a look
06-06-2004 11:37 AM  13 years agoPost 1
mattijs

rrApprentice

Keerbergen Belgium

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Last week I crashed my hornet very hard comming straight down from 20 meters, almost crashing on a horse !!!standing in de field next to where is stood. Reason was the tail hs50 gone bad.

My hornet I was equiped with HII blades (second set, last crash killed only one blade so i had one spare). One blade got shattered in 3 pieces the other didn't have anything on first inspection so i could use that with the spare one i had....or so i thought.

Later i saw this:

The other blade got slammed too. The cracks in the carbon go about as far as the pink circle.

Is this repairable?????


I was thinking of trying it by drilling 0.5 mm holes on the end of all the cracks to stop them from shredding further and than use a couple of layers of glassfiber with epoxy to make it sturdy again. Possible?

The damage is on the beginning of the blade, if it were on the outside i'd fly them without even repairing it but now i just am too afraid that it'll fail so.

I am not going to buy an other set as they are too expensive and i am dying for some weighed blades by WALT or even maybe woodies from like90 if they ever make them. Now i am flying on the HI blades and they really aren't anywhere near as efficient especially in climb outs they lack the power unless you use +15 degrees of pitch but my razor v2 doesn't like that very much

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06-13-2004 02:00 AM  13 years agoPost 2
helicopter34

rrVeteran

New Jersey, exit 82

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Guessing

Im guessing that you can just put a light coating of epoxy finishing resin on, probably diluted with denatured alcohol. That way it should seep into the cracks. I'm not sure though if that would be enough though. Wait for the carbon fiber fabricating experts to reply.

Make it idiot-proof, and someone will make a better idiot

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06-13-2004 11:33 AM  13 years agoPost 3
mattijs

rrApprentice

Keerbergen Belgium

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yeah were they at?

It doesn't however feel safe to just glue it. No matter what the experts say i will difinetly use fiber to strentghen. I'll have to do the other blade aswell but i don't care since it's the last set of stock blades i'll buy.

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06-15-2004 11:54 PM  13 years agoPost 4
ChristianM

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Oslo, Norway

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I would use thin CA and spray with CA accelerator (kick'er) afterwards. Alternatively use epoxy as has been suggested earlier. The trick is to avoid the epoxy from flowing away from the damaged area so you would have to let the blade cure with the damaged area facing down and using tape on the outside to “form” the epoxy. Remember, all carbon composites parts are glued together in the first place.

I would definitely not drill any holes in it to stop further cracking. That is a technique that is only valid for metals but not for composites (I will not bore you with the detail as to why that is). Drilling holes in it would only damage more fibers and weaken it further.

After fixing it I would spin the rotor up as fast as the motor can drive it while holding the heli in my hand, being very careful that I can not get hit by the blade if it should fail. Keep your finger on the throttle hold switch just in case.

Christian

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08-10-2004 02:28 AM  13 years agoPost 5
mattijs

rrApprentice

Keerbergen Belgium

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I recently did repair the blade with carbon tow epoxy and CA and after some carefull balancing and adjusting the other blade also they both fly very fine.

I have learned to do 3d now and even hard inverted climbouts do not seem to be any problem (the repair is on the upside, the side that i presume to get the most stress when inverted)

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08-10-2004 12:48 PM  13 years agoPost 6
mattijs

rrApprentice

Keerbergen Belgium

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BTW christianM, i know why you normally don't have to drill out composites....the last torn fiber has an ok one next to it blabla

To my surprise however i found that with the cf blades it IS really necesary.

I tested it on leftovers from other blades. Made a cut in them and then started pulling very hard to try to rip it further.

I made 4 cuts, two were drilled out....those two never ripped further...the other two were a piece of cake !!!!!

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