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Home✈️Aircraft🚁HelicopterSynergy R/COther › Synergy Tail Failure ... Again!!!!!
08-05-2007 08:24 PM  13 years ago
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chem

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Synergy Tail Failure ... Again!!!!!
Hello,

This afternoon, during my first flight of the day I crashed my Synergy because of a tail grip screw breaking.
Few weeks ago a friend of mine have had the same tail failure two times in a row.
Note that this screw wasn't overtighten, as writed in the manual.

Here's some pictures:





Someone had this kind of tail failure too?

What would the solution to solve this problem?

What type of screw must we use?
Chem
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08-05-2007 08:54 PM  13 years ago
P.J.

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Ireland

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chem

Its looks like you over tightened it

P.J.
SAB Heli Division
Hyperion
Spektrum RC
Scorpion Systems
Spartan rc
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08-05-2007 08:56 PM  13 years ago
ecosse2253

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n.ireland

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I second that pj diffinatelty over tightenedwww.westonuk.co.uk compass field rep uk and ireland
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08-05-2007 11:45 PM  13 years ago
bobc1

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Southern California

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Just curious. How can you tell that the bolt was over tightened from the photo's?
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08-06-2007 12:20 AM  13 years ago
j5coat

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Phoenix

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happened to me once, thankfully i hit the hold switch right away and landed with no damage. i just replaced the hub and put new screws in it and it has been fine.Trex 700, Trex 600n
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08-06-2007 03:59 AM  13 years ago
RCHELILOVER

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augusta, ga

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It was definitely overtightened, notice the missing part...

Charles
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08-06-2007 04:17 AM  13 years ago
vitek

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Corvallis, OR

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Possibly overtightned, definitely overstressed. Were you guys using 105mm tail blades?

Travis
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08-06-2007 05:18 AM  13 years ago
j5coat

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Phoenix

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i was using sab blades that came with the kit, but my bolt looked like it was defective. you could see when you looked at the bolt that only about 1/2 was a fresh break. The rest was a darker color that looked like it was cracked long before the blade was ejected.Trex 700, Trex 600n
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08-06-2007 07:04 AM  13 years ago
chem

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Dijon - France

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I use 105mm SAB tail blades that came with the kit.

Maybe the screw was overtighten... But then how tighten this one correctly, because I'm sure I didn't too much tightened it during assembly.
Chem
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08-06-2007 07:46 AM  13 years ago
chem

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Dijon - France

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This 3mm screw seems to be very fragile and don't endure any over tighting.
Maybe it would be better and safer with 4mm screw...
Chem
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08-06-2007 08:16 AM  13 years ago
Buzzin Brian

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College Station, Texas

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The best practice I have found in this area is to turn the nut down until it just stops, and only tighten further to take out in and out play. The keeps the stress off of not only the bearings, but the point that fractured in the PICS. I am sorry, but I have to agree. It looks to have been overtightened to me as well.Build it, fly it, crash it. Repeat as often as needed.
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08-06-2007 12:57 PM  13 years ago
Scraptor

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South East, England

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I had exactly the same problem, bolt sheared in an identical way. Cost me £100 because the whole tail shaft twisted through 90 degrees stripping the crown gear, tail gears, tail blade tore off, tail output shaft bent...... Auto'd it down fine. Perhaps I too overtightened the bolt!

Speaking to others, this has happened once or twice before.

Paul
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08-06-2007 05:00 PM  13 years ago
chem

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Dijon - France

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Maybe the good way would be that Synergy RC made a new Tail Rotor Hub with 4mm screw... What do you think about that?Chem
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08-06-2007 08:05 PM  13 years ago
Chuckie (RIP)

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Crofton Maryland

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Maybe the good way would be that Synergy RC made a new Tail Rotor Hub with 4mm screw... What do you think about that?
Well then Synergy would have to replace the radial bearings, thrust bearings, and blade grips to fit the larger screw. I would not want to see less metal on the hub ends.

Charles
Please stand by for faster service!
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08-06-2007 08:32 PM  13 years ago
UK Helinut

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Gloucestershire

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I had the same fault with mine. I did not over tighten either. Same fracture, same tail blades ect.
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08-07-2007 03:07 AM  13 years ago
RCHELILOVER

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augusta, ga

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I would not want to see less metal on the hub ends.
Why would that be? Wouldn't it make it more reliable?

Charles
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08-07-2007 03:42 AM  13 years ago
carzan

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Lone Star State

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had the same failure but mine was after a crash. I had repaired the heli and i obviously didn't dig deep enough. so one crash led to a stripped crown gear and a new tail hub.
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08-07-2007 06:04 AM  13 years ago
Mark C

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Houston, TX - USA

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chem I'm not here to tell you that you overtightned it or undertightend it. I'm just here to say that I feel your pain dude.

Been there and done that. Of course mine was "undertightened" and "uderlocktited" according to the powers that be.

This can likely be solved using a better grade bolt, a little less torque and a lot more locktite of the green variety.

Good luck on the rebuild. Get 'er flyin again ASAP.

Mark C.
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08-07-2007 06:54 AM  13 years ago
vitek

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Corvallis, OR

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I was told by some of the Synergy guys to use 95mm tail blades to avoid this exact problem. They said the 105s make a very large tail disk and put a lot of stress on that bolt and the hub. The 95mm blades dont' appear to hurt performance any.

I realize the kit comes with 105s, and lots of guys use them, but that is just the information that I was given.

Travis
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08-07-2007 10:47 AM  13 years ago
Revolution man

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France

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Me also I have crasher 2 times in one week because of Synergy Tail Failure.
I was equipped with 105mm Vblades
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