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Zoom › Q. What's fast, wooden and scarey?
02-12-2006 01:34 AM  12 years agoPost 1
Rob_T

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A. These:

Look Ma, no blades!

So, I'd just switched my trusty HS50 tail servo to a HDS-877 (digital micro) and was making a few short flights to try to get the gyro adjusted. I was spooling up again after adjusting the delay when there is a loud bang from the garden fence, and I notice the heli is "sans blades". One blade had hit the fence, the other was half way across the lawn. If they'd let go 90 degrees sooner or later they'd have scored a direct hit on me. (I did not see the blades during their escape, they went too quickly for that!)

The blades haven't been crashed, and my head speed is about 2250 RPM, not what I would call excessive.

Apart from the blades, damage seems to be bent flybar, bent main shaft and bent spindle

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02-12-2006 01:39 AM  12 years agoPost 2
PacketStorm

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Atlanta, GA - USA

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Pics haven't been released/verified yet...I'm anxious to see them

Good thing they both let go at the same time! Otherwise the damage would have been incredible. Did the feathering shaft let go?

Glad you weren't in the air and luck was on your side!

***
I just got the pics to show...wow check those "stretch marks"! How long had you flown that set of blades?

You fly...you crash...it's life

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02-12-2006 01:44 AM  12 years agoPost 3
Rob_T

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No, it was the blade roots that let go!

They're the cheap Evoflight woodies. There is no root reinforcement, and it looks like its needed!

The blades weren't old, I'd put them on since christmas and hadn't done much flying on them. They were accurately balanced (this pair actually came that way!) and the tracking was good.

I think the marks on the blade with the bigger "bite" out of it are just from the lawn- there is no matching mark on the peice of the root that was left in the grip.

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02-12-2006 06:32 AM  12 years agoPost 4
PacketStorm

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Atlanta, GA - USA

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D*mn dude!

Looks like a good message to stay away from that brand of wood blades.... You're right, absolutely no reinforcement on the roots. Trouble just lookin' for a place to happen.

Glad the damage to your bird was minimal - could have been MUCH worse!

You fly...you crash...it's life

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02-13-2006 11:47 PM  12 years agoPost 5
Blue

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Tupelo, MS

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I imagine your leg would be hurtin' too had they flown off at the right (actually wrong) time.

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02-14-2006 04:39 AM  12 years agoPost 6
flyhigh

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USA

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That's dangerous, should I stay away from evoflight brand blades? I had asked about getting carbon fiber blades. Imagine if that was the carbon ones that flew off.

I just might stick with the foamy ones.

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02-14-2006 06:47 AM  12 years agoPost 7
Mark C

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Houston, TX - USA

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I am at a loss as to how/why and what are the mechanics/physics where both blades let go (without the spindle letting go) and just leave the heli sitting there. I know this happens if a spindle bolt lets go. But that didn't happen here.

I can imagine one blade letting go then the insanely out of balance heli thrashing the crap out of itself and beating the other blade off but having both blades exploding off of the mast head at exactly the same instant?

Who'd a thunk it?

Mark C.

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02-14-2006 07:48 AM  12 years agoPost 8
Rob_T

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My guess is that one blade (the one with the neatest bite out of the root) let go first, and the incredible vibration ripped up the other blade immediately afterwards. It happened so fast there's no way I can say from watching it what happened first- it was all over in much less than a blink of the eye!

I dread to think what would happen if the blade had gone in a different direction. I was the only soft target nearby this time, and the heli was still on the ground, both of which were lucky! I will be re-evaluating what I consider a safe separation from the heli in the light of this- and more fussy about putting on safety glasses while checking tracking - although I doubt they would survive a direct hit on the lens!

Every shaft in the heli was bent - even the tail shaft! As I had flown it only a minute earlier I know every shaft was straight before the incident, as there was no vibration. I also picked up a very small dent in the tail boom, from the position I think a paddle managed to boom strike. The flybar was bent afterwards too.

The good news is that my Shogun is repaired and flying again with the replacement parts I mentioned.

I would still recomend Evoflight carbon and glass blades. I think they are made well enough to not suffer this type of failure (I have taken quite a good look at how those are made to get ideas for making my own composite blades). It's specifically the woodies with no root reinforcement that I'd suggest being carefull about!

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02-14-2006 08:04 AM  12 years agoPost 9
Rob_T

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The places the blades landed suggest the blades broke off in the order I said with just under a quarter revolution between the 2 going, as one was at the 3 o'clock position and the other at the 11 o'clock position. (But I'm sure there are many other ways the blades could have landed in these positions...)

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02-18-2006 01:51 PM  12 years agoPost 10
HeliBillAZ

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Sierra Vista, Arizona USA

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Rob,
Wow! I think I'll put my Evo blades back on the shelf. Thanks for sharing.
Bill.

Did Anyone See Where My Bird Went?

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