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08-09-2009 12:10 AM  8 years agoPost 1
Phoenix Flyer-2

rrNovice

Adelaide, Australia.

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Hi all..
Yesterday morning i went out to my local club for a fly. To come back 30mins later..
I starting flying with new SAB 710 Red Devils. I did about half a tank then when i was in a hurricane something went bang....
i auto and landed it..

i noticed that i was missing a fair chunk of blades and a dent in the boom..
i did noticed that the blades were not as tight as they were when i took off.. could this have been the problem..
cheers
Hamish

Logo 600 vbar | Beam E4-A mini vbar | Futaba Fasst on a 12z

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08-09-2009 12:19 AM  8 years agoPost 2
Blade_Master1

rrElite Veteran

Canada

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yep
loose blades can and will do that.

tighten em up some, those are long blades they should be somewhat stiff to move.

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08-09-2009 10:55 PM  8 years agoPost 3
BrunoBL

rrKey Veteran

Pomerode, SC, Brazil -26.71, -49.17

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Good save!
Autoing in was a wise move. The heli might otherwise have shaken itself to pieces from vibration caused by the missing blade piece.

With those large blades, my indication for good tightness is to attempt to slowly initiate a swinging movement on the blade, while also grabbing a flybar paddle. The flybar should flex about 1" from its resting position. If it flexes more, or less, I'll know that the blade is too tight or too loose, respectively, in its grip.

For reference, this is on a 4mm flybar, and the paddle inboard section is about 220mm from the main shaft centerline.


...Bruno.
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DX7

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08-09-2009 11:04 PM  8 years agoPost 4
BONO1

rrApprentice

AR

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I just tighten as tight as I can and they still straighten out and stop shaking before take off. Any tighter and it never stops shaking.
This has worked for me.
Sam

blow smoke

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08-11-2009 05:51 PM  8 years agoPost 5
Justin Stuart (RIP)

rrMaster

Plano, Texas

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This was on a Stratus, right? And the 710s are mounted to a Tempest head? You're sure the blades hit the boom and not one of the t/r blades?

Avant RC
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08-12-2009 11:44 AM  8 years agoPost 6
AaronJohnson

rrElite Veteran

mason,MI

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You need to "pin" your boom. Use a small screw thru the boom support clamp and into the boom. Keep the screw short enough so it doesnt touch the torque tube. It keeps the boom from sliding in the clamp and reduces a lot of flex. Kyle Stacey had a few boomstrikes this year and they found that pinning the boom took care of that problem. I beleive he uses 710's also.

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08-13-2009 12:45 AM  8 years agoPost 7
Warrick

rrApprentice

Perth, Western Australia

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Hey Hamish,

I had a similar issue a couple of weeks ago, in my case it was lack of maintanence in the rotor head (Hadn't needed to touch it for a few years!).

Grab the blade grips and try and move them in and out, if they are moving then you certainly have issues with the dampeners that you need to address.

Then holding the head so it doesn't move try pushing the tip of your blade down to the boom, if you can and the blade grips are tight then you definatley have issues.

The other thing to check is the main shaft bearings, mine had just started to collapse when I managed to hit the rotor blades into the horizontal fin bolts. So my main shaft just rocked 2-3mm at the top which wasn't good.

Hope that helps ya!

Cheers,
Warrick

Cheers,
Warrick

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