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HK 600 Tail Failure
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hairykarts View Drop Down
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Posts: 455 		  Quote hairykarts Quote  Post ReplyReply Direct Link To This Post Topic: HK 600 Tail Failure
    Posted: 13/Apr/2011 at 1:28pm
On first run up at nominal speed, testing servo's and gyro my tail pitch assembly pulled apart .
 The reason, the thread into the pitch body was non existant and the sleeve which screws into the t arm only srewed in 1/8 of a turn ( probably less than 1/10 mm), this should screw all the way through ( about 5mm). I had no blades on (thank God) but the whole tail swung violently clockwise , due to the torque . Luckily nothing else broke.
If this had been airborne it would have destroyed itself !  Angry


Edited by hairykarts - 13/Apr/2011 at 1:29pm
I must remember .... when inverted .... down is up and up is down .
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Posts: 3804 		  Quote Blind Vision Quote  Post ReplyReply Direct Link To This Post Posted: 13/Apr/2011 at 4:42pm
hairykarts, - you seem to have the knowlegde behind you " this should screw all the way through ( about 5mm)."
-can't figure out why you spun it up (tested it) at first.
nor can i figure out why you would have no blades on, in a run-up test.

Glad you where not hit by it, and that it did not break.
Doing some guerilla gardening... take a peek; http://www.facebook.com/groups/416558261701047/ lokal bustop infront of my flat
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hairykarts View Drop Down
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Posts: 455 		  Quote hairykarts Quote  Post ReplyReply Direct Link To This Post Posted: 13/Apr/2011 at 6:01pm
Blades still in the post, and was just testing the set up and travel of the servos and the running of the belt and gear meshing.
I must remember .... when inverted .... down is up and up is down .
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Posts: 254 		  Quote Mattyc Quote  Post ReplyReply Direct Link To This Post Posted: 14/Apr/2011 at 7:43am
Which part was this on man? Can you post a pic? 
Matt

People who can not solder have no business flying RC aircraft :P
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hairykarts View Drop Down
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Posts: 455 		  Quote hairykarts Quote  Post ReplyReply Direct Link To This Post Posted: 14/Apr/2011 at 1:02pm
Not very good on posting pics , but if you look on the align manual, on part 143 into it is threaded a banjo bolt (hollow) around which the bearing part no 138 sits, that banjo bolt threads into the t piece . On mine there was virtually no thread on the bolt and where it went into the t piece ( 143) there was also no thread on that either. Hope I am clear. Rob
I must remember .... when inverted .... down is up and up is down .
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Posts: 74 		  Quote SubcultureD Quote  Post ReplyReply Direct Link To This Post Posted: 15/Apr/2011 at 1:41am
Had the same problem. I used red locktide (not recommended) and finally it stays put. But in my case it was just the thread in piece 143 that wasn't manufactured well. It's just a little to big for the screw to really hold.

Danny
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Posts: 52 		  Quote solidcarlo Quote  Post ReplyReply Direct Link To This Post Posted: 16/Nov/2011 at 2:59pm
i put a lot of thread lock. and i guess its ok now...

by the way, i lost the small metal part to lock the tail and prevent it from rotating.. where can i get that replacement?
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Posts: 11 		  Quote peasea Quote  Post ReplyReply Direct Link To This Post Posted: 21/Feb/2012 at 7:34pm
I just received my kit this month Feb 2012 and tried to unscrew the banjo bolt to check the thread and it snapped the threaded portion very easily leaving the broken threaded portion stuck in the control link yoke. The pitch slider is now toast....! Does the Align pitch slider and shaft slide bush fit the HK tail rotor grips? This part of the HK 600 looks like one I want to avoid.     
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Posts: 455 		  Quote hairykarts Quote  Post ReplyReply Direct Link To This Post Posted: 25/Feb/2012 at 6:02am
Re align ...yes it fits , also had no probs since with my hk one .
I must remember .... when inverted .... down is up and up is down .
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