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HelicopterCrashed? Discussion and Photos › Main Blade Seperation!?!?!?
06-05-2004 01:34 PM  13 years agoPost 1
OkiPilot

rrNovice

Okinawa Japan

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Okay...a little confused here! It was the first flight with my Hawk Sport after replacing all normal crash items (including feathering shaft) and upgrading to carbon/glass blades, from woodies. I was hovering for about 1/2 tank, trimming and adjusting tracking of new blades. After the hover was stable I went for some spins around the field. Just as I entered forward flight, about 30 yards away and roughly 40 feet up, both main blades went soaring in 2 different directions! I tell ya, it was a pretty cool whoosh sound, followed by the thud of the heli hitting the dirt. upon inspection I found that one of the bolts, holding the blade holder to the feathering shaft, had come off. Not come loose, but slid right off over the threads. One end of the feathering shaft no longer has any threads at all, it is completely smooth?!?!?!?! Anyone else ever have anything like this happen? No pics because the damage was pretty minimal, I am actually rather impressed with the way the hawk held up the impact.
BTW--this was a brand new feathering shaft and bolts that were torqued down very tight and locked with thread lock!

Happy flying...
"It wasn't me, it was a sudden gust of gravity!"

"it wasn't me...it was a sudden gust of gravity!"

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06-07-2004 12:13 AM  13 years agoPost 2
jdowns

rrNovice

San Diego, CA

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Very interesting to hear that. I had a similar disaster with my Raptor 30, but wasn't aware such a problem might also happen with the Century Hawk.

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06-07-2004 01:38 AM  13 years agoPost 3
rcheliheaddaz

rrApprentice

Sth Wales / UK

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I had a similar thing go wrong when I was replacing my feathering shaft. Fortunatly I felt it happen as I was assembling my main rotors. I was tightening the bolts and as you stated allso, I was making sure they where tight.
Thing was as I was just getting satisfied with how tight they were, Then one went soft. I took them back off only to find that the one end of the feathering shaft threads were worped from me over tightening them.
I was glad to have noticed this because had I gone on to fly the heli I could have suffered what you did.
I now only tighten them to the point just beyond resistance and with threadlock if they are not Nylock nuts which mine are normaly. I monator them before and after each flight. But the cause was me being overly aggressive tightening them.
Not saying that this is the cause of your malfunction, But it is one to be aware of as it sounds so like mine.
Sorry you where flying though.

Regards,
Daz.

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06-07-2004 08:35 PM  13 years agoPost 4
Ninjak2k

rrApprentice

Centreville, VA

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I agree with Daz. It sounds like you overtightened the nuts and it warped the threads. Don't recall if the manual mentions not overtightening. I know I became aware of it from other posts in the Century forum while looking for something else.

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HelicopterCrashed? Discussion and Photos › Main Blade Seperation!?!?!?
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