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03-18-2009 01:42 AM  8 years agoPost 1
bopshi

rrApprentice

greenport ny

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Tried to fly my Hawk Pro today. On spooling up it threw a blade. It appears that the nut that holds the blade holder on the feathering spindle blew rite off. threads failed,does not look like it loosened. I always check them and they are fibor lock nuts anyway. Is it possible to over spin a hawk pro with a 32 engine and all stock set up?. The only way I could see doing it, if I had not enough pitch and too much throttle. But with an all stock set up? dave mann

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03-18-2009 02:04 AM  8 years agoPost 2
SteveH

rrProfessor

Texas

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Had the exact same thing happen to me one time on a brand new Hawk Pro. The problem was a bad feathering shaft. The threads on the end where the blade grip came off were deformed.

The government cannot give you anything without first taking it from someone else.

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03-18-2009 02:28 AM  8 years agoPost 3
just4fun2

rrApprentice

torrance

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what's the relationship between the Hawk feathering shaft and swift shaft? I hope they're not the same.?

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03-18-2009 04:24 AM  8 years agoPost 4
oldfart

rrProfessor

Vancouver, Canada

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How long ago was that SteveH?

Would you say it was a fairly isolated case, as I cannot seem to find other threads over the years on this happening?

bobshi

Sorry to hear of your problem.

How old is your Hawk Pro or its feathering spindle?

Is this the one that you have flown for 14 gallons of fuel??

I ask, because I have sold literally thousands of Hawks over a number of years, and I have never had this reported on any I have sold.

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03-18-2009 04:32 AM  8 years agoPost 5
Blade_Master1

rrElite Veteran

Canada

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Hawk feathering shaft and swift shaft

completely differant
Swift

Hawk Pro

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03-18-2009 04:34 AM  8 years agoPost 6
Blade_Master1

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Canada

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I could see it happening from stripping the nut while tightening
those spindles are awfully thin

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03-18-2009 04:34 AM  8 years agoPost 7
SteveH

rrProfessor

Texas

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How long ago was that SteveH?

Would you say it was a fairly isolated case, as I cannot seem to find other threads over the years on this happening?
Phil, it was quite a while ago...maybe three years, and it was the only one I ever saw like that. The shaft looked like the end of it had hit a high speed grinder towards the end of manufacturing, and it had taken at least 1/3 of the threads off. It threw the blade grip on the first spool up. Another case for it being better if it was a total kit, IMHO. I did not take the head apart to check things first.

The government cannot give you anything without first taking it from someone else.

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03-18-2009 12:48 PM  8 years agoPost 8
Ray Fernandez

rrElite Veteran

Guam (U.S.A.)

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I've only heard of one case where the spidle broke, throwing a blade grip and blade but that was on a small electric. This is the first time I've heard of a Century product doing this. Hmmmmmmm.

Ray Fernandez - GUAM

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03-18-2009 01:31 PM  8 years agoPost 9
Frank Bostwick

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Cincinnati Ohio

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I was going to agree with BM on cross threading being the most likely cause but after looking at the OPs profile, I highly doubt cross threading was the cause. No one is perfect but 27 years turning a wrench on aircraft, cross threading is not too likely. Still, I really can't see how that happened. Is that the stock Hawk Feathering shaft or the good idea to upgrade to Raven F/S? Either has a lot of threads for the job.
My preflight includes looking at both ends of the F/S to make sure I see threads sticking out out the nuts.

RIP ROMAN

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03-18-2009 01:33 PM  8 years agoPost 10
SteveH

rrProfessor

Texas

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The thing to keep in mind here is the rotor head on the Hawk Pro is assembled at the factory.

The government cannot give you anything without first taking it from someone else.

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03-18-2009 03:57 PM  8 years agoPost 11
bopshi

rrApprentice

greenport ny

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throne blade

When examining the threads they look like the nut pulled stait across the threads. I did not install the blade holders. Glad to hear this rare so hopefuly this will be my last!

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03-18-2009 04:57 PM  8 years agoPost 12
Frank Bostwick

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Cincinnati Ohio

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Sure is the first one I have heard of

RIP ROMAN

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03-18-2009 06:12 PM  8 years agoPost 13
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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probably the one thing i fear the most is a thrown blade...second from that, total loss of radio control.

glad no one was hurt!

Shawn
Team Leisure-Tech
Team HelixRC

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03-18-2009 06:22 PM  8 years agoPost 14
TOSH

rrElite Veteran

UK.Peterborough

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Had this happen 3 times on a concept 30 ten or twelve years ago. Most helis are beefed up now. Thought it was a thing of the past.

Flybars. Who needs `em.

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03-18-2009 08:11 PM  8 years agoPost 15
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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i know the Align 600N's were having this issue for a while...

the excuse was that 600E blade grips were being used on 600N's...

also, that people were running them too fast (2200rpm range).

i think all of that is completely unacceptable and very ignorant of Align to release a product that could fail so easily...with the potential to kill at that. people should not have to "upgrade" to metal grips to feel confident that their helicopter will not throw a blade through someones neck.

Shawn
Team Leisure-Tech
Team HelixRC

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03-18-2009 08:33 PM  8 years agoPost 16
canbarelyhover

rrVeteran

Sunnyvale, CA

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thank goodness century makes tough plastic blade grips or else i would have been in trouble. when i first got my raven, i leaned it out too much after break-in, never adjusted my initial throttle curves, and on top of that moved zero pitch to center on the pitch curve. all this combined for a 2300 headspeed on half a dozen flights. i didn't know what normal sounded like. to me it was always screaming even when i maidened it with headspeed of 1700.
luckily someone noticed before my engine ate itself. my point is, the stock plastic rotor head never skipped a beat even with that abuse.

Citizen #830

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03-18-2009 08:35 PM  8 years agoPost 17
imnxtc

rrVeteran

BC.Canada

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Seems this one was after 14 gallons of fuel where flown on the heli. That is a lot of flying on a 30.

I replace my spindles more often then every 14 gallons - not through standard maintenance, but I have never gone that long between crashes.. So all my spindles do not get anywhere near that many flights before them and their retaining nuts are replaced.

Seems like it could have been simply metal fatique finally taking its toll.

In my experience, any defects will always show themselves in the first 10 to 20 flights or so.

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03-19-2009 02:35 PM  8 years agoPost 18
bopshi

rrApprentice

greenport ny

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LOL ITS Thrown not throne

Cant spell anymore!

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03-19-2009 03:24 PM  8 years agoPost 19
Frank Bostwick

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Cincinnati Ohio

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When I first saw the topic I thought it would be a collection of busted blades

RIP ROMAN

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03-19-2009 04:22 PM  8 years agoPost 20
TOSH

rrElite Veteran

UK.Peterborough

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l thought he`d made a seat out of them.

Flybars. Who needs `em.

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