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Home✈️Aircraft🚁HelicopterFuel-Helicopters New or Limited ActivityAvant › my aurora main rotor decides to leave!!!
09-14-2009 05:59 PM  11 years ago
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canopy madness

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GREECE

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my aurora main rotor decides to leave!!!

Watch at YouTube

http://www.youtube.com/watch?v=xxl5G14uUv8
This happend today
The heli was new counting about 22 flights
I cant understand the reason the main shaft pin gone away ( or broke ?)
The resault is a bad damage of the heli , BUT the frame is undamaged!!
That shows the quality of the heli...
when i was going to find it i was thinking that probably nothing left undamaged
is it a good idea to replace the pin with a Socket head cap screw with a Nylon insert Locknut ?
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09-14-2009 06:27 PM  11 years ago
Thomas Moore

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California

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I don't know for sure why your mainshaft pin would come out, but a possibility is that you didn't tighten the main shaft set screw enough. As a hint for the rebuild, when installing the pin again, put blue locktite on the pin before inserting. Just spread it around the pin and insert it. This will ensure that in the event your set screw is not tight enough or it loosens, the locktite will hold the pin in.

If you want to use solely a screw and lock nut, you need to drill out the mainshaft and auto hub to 4mm.

Thomas.
Thomas Moore Team Avant Team Edge
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09-14-2009 06:35 PM  11 years ago
Jason Bell

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California

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Ive seen this happen twice to the team pilots, once they realized the manual called for loctite on the pin itself, they have had many flights afterwards with no issues what so ever. You need to not only loctite the set screw that holds the pin in, but the pin its self.AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus
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09-14-2009 06:38 PM  11 years ago
SunRed

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Denmark

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Aaaaauuuutchhhhh. I feel sorry for you man.

I have tried to break the pin once after an Auto.
Luckily it was the last one, so I discovered when carrying it back to the table.

I think you overtightened the set screw and the pin broke in the end (Maybe after some of your hard autos )

Avant recommends NOT to use anything but the original pin????

Good luck with the rebuild - It doesn't look that bad.
- But a shame with that nice canopy.
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09-14-2009 06:51 PM  11 years ago
canopy madness

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GREECE

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the truth is that i didnt use loctite directly to the pin but only to the screw that holds the pin...
But i didnt overtight the screw because i took the main shaft out before a couple of days to clean the main shaft oneway and i saw the pin it was ok.
anyway i will loctite everythink this time.
Also i want to say that this was the 1st time that the rotor was running at 1950 rpm at idle up 2 (i usualy fly at 1850 rpm idle up 1)

As for the canopy its the last think that i m worried about because i paint them
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09-14-2009 07:38 PM  11 years ago
Justin Barry

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Prescott Arizona

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You need to use loctite on the pin itself and that will prevent the pin from coming out in flight.

Team Avant
Canopy Works
Edge Blades
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09-14-2009 07:51 PM  11 years ago
Thomas Moore

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California

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Justin can honestly say that from experience :PThomas Moore Team Avant Team Edge
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09-14-2009 07:55 PM  11 years ago
John Benario

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Las Vegas

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Make sure to grind a flat on the pin for the setscrew to engage.

John Benario
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09-14-2009 09:04 PM  11 years ago
canopy madness

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GREECE

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Thank you very much for your advices
i d like to ask somethink
is there any posibility that the pin broke when i canceled some autos
with governor on so full power was imediatelly?
could this brake the pin?
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09-14-2009 10:03 PM  11 years ago
John Benario

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Las Vegas

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I was going to mention the autos - doing power recovery autos with a 90 is a bit risky. The engines have so much power it is a lot of stress on the sprague bearing, especially on the Aurora which has had so many issues with the sprague slipping.

John Benario
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09-14-2009 10:05 PM  11 years ago
Justin Barry

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Prescott Arizona

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From the video, the pin came out completely. When the pin breaks, it stays inside the shaft and the shaft doesn't come completely off the heli, it just moves up some.

Team Avant
Canopy Works
Edge Blades
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09-14-2009 10:30 PM  11 years ago
canopy madness

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GREECE

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thats what i think
i examined the main shaft and the gear where the pin was and there is nothing that shows stress
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09-14-2009 10:45 PM  11 years ago
Daniel Jetschin

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Germany

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I use to grind a flat spot on the middle of the pin to have the screw engage. That way loctite on the screw is enough and also ensures that you only need to snug the screw w/o stressing the pin. Loctite on that pin can make it a real pain to get it back out in cases of maintenance Used that method on all pins used in that heli.

Dan
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09-15-2009 03:16 AM  11 years ago
TankDirt

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Illinois

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ouch..always happens at the worst times huh?

I understand Daniel about it being a pain to remove but if this was me I would take all possible measures to ensure it doesnt happen again..includeing drilling and tapping for more setscrews
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09-15-2009 03:02 PM  11 years ago
canopy madness

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GREECE

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I posted the video to Avant forums trying to get some answers from the pro but they didnt allow the post and untill now no answer...
Very good customer service!!!
and i m wondering why they didnt allow the post?
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09-15-2009 05:37 PM  11 years ago
carcrasher

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east coast

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If you're new there they first want to see what the post is. this prevents trolls from going there and posting BS.
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09-15-2009 05:42 PM  11 years ago
Thomas Moore

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California

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You got an answer from most of the pros on here :P both Jason and Justin are team avant pilots not to mention Daniel, so you are in good hands.Thomas Moore Team Avant Team Edge
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09-15-2009 06:04 PM  11 years ago
canopy madness

rrNovice

GREECE

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Yes i know they are pro , but i mean that when somethink is going wrong
the first you ask is the manufacturer
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09-15-2009 08:49 PM  11 years ago
Thomas Moore

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California

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I totally understand where you are coming from. Glad you cam get an answer from both forums.

Here is an excerpt from the manual stating that the pin needs to have locktite applied on the pin itself before installation.

Thomas Moore Team Avant Team Edge
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09-24-2009 09:53 AM  11 years ago
Taipan

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Sydney, Australia

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Why is a pin used and not a nyloc nut & bolt like on the T-Rex 700?
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