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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › align 700n pro
12-20-2010 11:13 PM  9 years ago
rcav8tor

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Toledo OH USA

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bolts
The thread was started about the tail bolts not the head bolts
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12-20-2010 11:41 PM  9 years ago
Thumpernator

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Senoia, Georgia, USA

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The thread was started about the tail bolts not the head bolts
OP said,
so any input on what's going to fall apart before I build the kit would be great.
Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk
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12-21-2010 12:12 AM  9 years ago
floppy23

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peace dale RI United States

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tail and spindle bolts
Where can I get the new bolts from?
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12-21-2010 12:33 AM  9 years ago
Santiago P

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Dayton

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Yes please, can someone post a part number for the MA part or Dubro substitute, for those who want to change theirs "just to be sure"
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12-21-2010 12:51 AM  9 years ago
BLUETHUNDER

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Glass City

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12-21-2010 01:03 AM  9 years ago
PC12DRVR

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USA

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MA 0063's work for the tail, for the head I went to Lowes and bought some M6x20 12.9 bolts
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12-21-2010 01:34 AM  9 years ago
knightofcarnage

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chicago

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I have a question about the second video "J.C. Zankl---flight and crash: 2009 XFC"? Is that really a 700N. I nevery seen a canopy shape like that.
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12-21-2010 01:56 AM  9 years ago
yak3

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elmwoodpark new jersey

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tail grips
i am a really good flier and mecanic i have 4 700n i have had this same prblem 4 times using the metal grips it always breaks while piro flipping luckly i was able to safefly auto the heli down withonly the damage from the grip snapping i dont over tighten the problem is align has crapie quality contronl and those grips are interchangeble between the 6and 700 now the 700 is twice the tourqe and power to solve problem on one heli i put the quiks on and the other 3 i changed the bolts to a much harder grade bolt so far so good with 20-30 gallonn on them i have only been flying 2 years but have gone thru 9000.00 in fuel i live and breath the hobby as a matter a fact had bad auto yesterdat and for second time the main shafts brand new fronm align well the holes did not line up for head block aside from a few sorry qaulity parts that you get with kit align is still best for the money on one of my 700s i have over a thousand flights and have only had to change the bearing and ring once but yes this tail grip issue sucks cause it cost around 100-120 bucks each time this happened each time new pitch slider grips tail blades and tail shaft and tube cause the out of balance spins it
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12-21-2010 02:55 AM  9 years ago
HiroboFreak

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Central Coast, NSW, Australia

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That is one long sentence. T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx
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12-21-2010 03:36 AM  9 years ago
Santiago P

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Dayton

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I have a question about the second video "J.C. Zankl---flight and crash: 2009 XFC"? Is that really a 700N. I nevery seen a canopy shape like that.
Yes is a 700, and a very unfortunate mishap.
There are a number of aftermaket canopies for the 700. Think that was a Fusono or Canomod.

This thread because of the video is creating more awareness than all the previous ones and maybe having some folks take a closer look to the cause.

I have been analyzing this and cannot think no other than quality control issue. If it was a design flaw, you would have higher % more tails snapping off in flight, and that is not the case.

Not having all the dimensions and weights I can’t do a full stress analysis, but I am sure someone at Align has and knows the stress margins for this bolt under load, assuming good material qualities on the hardware. If such formal analysis does not exist, well we rather not assume anything.
Most other tails do not use a bolt to hold the grips but the hub itself takes the bending and bearing loads while leaving a nut to take the axial load.
The pictures of bolt breaks look like bending failures.

Thanks you BLUETHUNDER and PC12DRVR for the hardware info.

Santiago
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12-21-2010 04:19 AM  9 years ago
BLUETHUNDER

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Glass City

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A high quality bolt with a large root radius would help prevent
this type of bolt failure mode. (See Link Below)

http://unbrako.ca/docs/Eight%20Adva...f%20Unbrako.pdf
6. RADIUSED ROOT THREAD RUNOUT
At the beginning of 1966, the thread specification for aircraft fasteners, MIL-S-8879, was released. In
Revision A of this spec, it stated that the runout threads must have root radii as large or larger than
the normal root radius of the threads. The purpose of this requirement was to strengthen this specific
area of the fastener, because this was where most fastener failures occurred.
The initial use of this specification was for aircraft fasteners, and while it certainly proved its
worthiness in these applications, it has never been added to any commercial fastener standard.
However, SPS saw the merits of this technological advancement, embraced this concept, and
developed a Radiused Root Runout as a standard feature on all of our socket cap screws.
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12-21-2010 12:05 PM  9 years ago
Felt

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Acworth, Ga

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I just upgraded my tail with the KDE upgrade. I hope this will prevent this problem.
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12-21-2010 12:52 PM  9 years ago
PC12DRVR

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USA

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It should the replacement bolt is grade 12.9
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12-21-2010 06:17 PM  9 years ago
Felt

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Acworth, Ga

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What does grade 12.9 mean? Sorry, I haven't heard this term before.
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12-21-2010 06:32 PM  9 years ago
PC12DRVR

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USA

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It's the grade of the steel, there's grade 8, 12.9 etc, and others but 12.9 is the highest tensile strength you can get in common steel bolts
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12-21-2010 06:57 PM  9 years ago
Thumpernator

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Senoia, Georgia, USA

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What does grade 12.9 mean?
Here's a good FAQ

http://www.boltscience.com/pages/faq.htm

BTW, I agree with everything PC12DRVR said about the spindle bolts. I don't care if a person has never seen it happen before, doesn't know anyone it has happened to before, or any other excuse, it doesn't mean there isn't a problem. Heck, I've never known anyone who had their Ford Pinto blow up or their Toyota accelerate at will, either.

Anyone know the extent of the injuries incurred on that second video?
Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk
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12-21-2010 08:47 PM  9 years ago
BLUETHUNDER

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Glass City

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The person that was injured was Benny Chi (Justin Jees dad) goes by RedZ06 on RR you can PM him. Benny was struck in the eye by the lead
Weight from the broken MS Composite blade. I believe he has some retina Damage from the accident which affects his vision. I hope he
Is doing well and his vision is improving. This accident happened
Because MS blades did not use a safety retaining wire for the blade
Weight like Radix,Edge, & other manufactures have been using. also
Most of the flying @ the 2009 XFC was being done over the concrete
Runway and this is were the crash impact occurred, which scattered
Parts and debris just like you were throwing marbles on ice.
If the crash would have been over grass, the grass would have
Helped contain/absorb the parts and debris from being thrown as far.
For 2010 XFC they moved the flying off the paved concrete runway
For saftey reasons after this accident in 2009.
I would prefer they move the XFC back to the grass field (WACO Field) in Troy Oh.

Benny talks about the accident in this RR thread below.

https://rc.runryder.com/t527803p1/
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12-21-2010 09:29 PM  9 years ago
Santiago P

rrProfessor

Dayton

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I would prefer they move the XFC back to the grass field (WACO Field) in Troy Oh.
Dont think it will ever happen at Troy. The club became somewhat greedy (I heard) and forced the XFC to migrate. The even has lost attendance greatly since.

This year the distance from the flying to the spectators felt huge to apreciate the helicopters. They did to move the helis to the grass, but left the spectators on the same place.

Wish they used a diferent field over grass somewhere else at AMA. The paved runway is high and the ground slopes down, north and south from it making it great foe safety like a barricade, but bad for spectators who can't see shizznizz when helis get low.

There is always room for improvement.

Now back to this regulary scheduled Maury Povich show: "Bolts, and the grips who leave them"
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12-22-2010 02:50 AM  9 years ago
rcav8tor

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Toledo OH USA

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Bolts
I still say studs and nylock nuts
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12-24-2010 01:20 AM  9 years ago
Mike Fortin

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USA

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This past year all helicopters flew off of and over the grass, the edge of the runway was considered the no fly zone.

This change was made in the interest of safety and to put more distance between the models and the spectators.

It was a good change in my opinion and even allowed us to get just a little bit lower in the more forgiving grass.

It will be the same again in 2011.
Have Rotors, Will Fly!
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