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HomeAircraftHelicopterAlignT-REX 700N › Here we go again!!
08-13-2010 02:09 PM  8 years agoPost 1
PC12DRVR

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USA

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So I was putting the 8-9 flight on my brand new 700N it has a 91SR and is purring, no visible vibration, in the canopy, tail fin, anywhere. Mini-G is locked in at 100% gain, tails holding great. I'm in a hover about 10ft up then pop-zing! There goes my complete TR gearbox off the boom, no problem I hit hold and autoued it in, no further damage. I don't know what the heck happen, that is until I pick up the pieces! I had the upgraded LE tailgrips which come preassembled, the effing grip bolt sheared off!! WTF. The force of the imbalance ripped the tail right off the boom.

I had an incident with my other 700N last fall when one of my main grip bolts failed and the heli blew up, so now I run upgraded bolts on both my 700's, 15 gallons no issues. I don't mind replacing parts when something is my fault but this just pisses me off. Thanks again Align for the junk fasteners.

In the pic in the middle you can see I found the other grip and blade in the grass about 200ft from where it came off. Watch your eyes guys!!

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08-13-2010 03:41 PM  8 years agoPost 2
swasey1982

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La Ceiba, Honduras

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nice save !
PC12 Nice save man, maybe a overtorqued fastener maybe? hope you get this solved soon.

Richard

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08-13-2010 06:24 PM  8 years agoPost 3
Thumpernator

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Senoia, Georgia, USA

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Good save, J.

So here's another high stressed bolt that may need to be replaced with one of higher quality.

I know you did a Search to see if anyone else has had this happen,,,,,, so,,,,,, did you find any?

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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08-13-2010 07:12 PM  8 years agoPost 4
PC12DRVR

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USA

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Thanks guys,

I could swear I read a post about this happening to someone else not too long ago, I went a few pages back here and could not find it. If anyone remembers please post it here.

So I went to New England Heli today and picked up the repair parts and it cost me almost $100 for this stupid bolt failing. I bought a new LE TR assembly since the thrust bearings are ruined in the original, and you can't buy them seperately, and am going to take out the stock bolts and replace them with MA #0063 M3x10mm bolts, I am hoping they are a little better quality than the chinese ones. I have a QUK tail on my other 700 and its been great, but they did not have one at the store and I wanted it fixed, (yes im impatient), and I like being able to use the stock Align TR hubs. We'll see I guess. I love these 700's but geez they gotta watch these cheap bolts,theres too much at risk here, safety and money wise.

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08-13-2010 07:18 PM  8 years agoPost 5
TT2

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Nakhonsawan Thailand

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Thanks for the heads-up. I'm replacing TONIGHT!

I've already replaced the frame screws and spindle bolts with Lynx.

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08-13-2010 07:34 PM  8 years agoPost 6
PC12DRVR

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USA

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I've already replaced the frame screws and spindle bolts with Lynx.
Good call, me too

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08-13-2010 10:34 PM  8 years agoPost 7
HiroboFreak

rrVeteran

Central Coast, NSW, Australia

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There has been a few reports of the 700 tail bolts failing recently.

I actually had mine fail last weekend, but mine was fitted with the KDE V2 Dual Bearing "upgrade".

The bolt sheared off flush with the end of the hub, the inertia tore the entire tail assembly off the boom.
I was in a fast inverted circuit at the time, I threw Hold & managed to get it upright but I was too low to regain any headspeed for a nice landing.
Not a big crash, but still it should not have happened.
My 3 flight old "Bling" canopy made it hurt the most.

I have had this machine for 2 years & this was it's first crash.
I would have much preferred it to have been pilot error!

After receiving my new KDE set I noticed that it now comes with 12.9 grade bolts. (Before they were just run of the mill bolts).
There must have been a few reports, hence the higher quality bolts.

During the repairs I also fitted a set of Lynx spindle bolts.

Should be bullet proof now.

Not happy that it happened, but, "Back on the horse" as they say.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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08-14-2010 03:50 AM  8 years agoPost 8
robv

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SoCal

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Good save PC12! I was wondering how long it took you to find all the parts... Also, are the MA screws longer than the ones from Align?

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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08-14-2010 05:54 AM  8 years agoPost 9
chopper_crazy

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Delphos, Ohio

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sounds like a little bit of luck and whole lot of skill. Nice save.

It's a complex, costly, glow powered anti-gravity machine!

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08-14-2010 08:51 AM  8 years agoPost 10
Kennethk

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Copenhagen, Denmark

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My 700E had the same problem.(metal tail)
After 30 flights the bolt broke, i have mounted the plastic tail with the align bolts and havent had any problems.

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08-14-2010 12:19 PM  8 years agoPost 11
hanzuki

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London, Ontario-canada

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After 115 flights on my 700 on the stock plastic grips one of bolts broke, same as yours. I upgraded (or so I thought) to the metal grips, they broke 6 flights later. I now have a quick uk tail and have had no issues.

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08-14-2010 12:58 PM  8 years agoPost 12
PC12DRVR

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USA

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Robv it only took me about two or three minutes to find the parts, I saw the gearbox fly off and it landed maybe ten feet away from the heli, kinda flew up in the air, the grip still had the blade attached so it was pretty easy to see the white against the grass.

The MA screws are a little longer so I will either have to file them down a little bit, or use an extra washer, hopefully get to it today.

I too have a QUK tail on my other 700 and its been hassle free.

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08-15-2010 03:37 PM  8 years agoPost 13
Thumpernator

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Senoia, Georgia, USA

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Since it was raining all damn day yesterday, I decided to take a look at the bolts on my two 700's. On the one with the blue anodized grips, the bolts were nice and tight with Loctite. Replaced them anyway,,,,, just for the heck of it.

On the LE with the stock grips, the bolts were tight but without any kind of Loctite. Replaced them too,,,,,with Loctite.

I'm wondering if your bolts weren't tight to begin with? If they were loose, or came loose due to the lack of Loctite, the constant flexing could have broken off the bolt head. Just a thought.

BTW,,,,, raining again today!!

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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08-15-2010 03:56 PM  8 years agoPost 14
PC12DRVR

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USA

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I took the other screw out and it was in good with loctite, I can't do anything with the other one, so I don't know?

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08-15-2010 04:05 PM  8 years agoPost 15
Phoenix_8

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USA

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Thanks
for the heads up. Will check my bolts tonight. Good save though; it sounds like it could've been worse.

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08-15-2010 05:10 PM  8 years agoPost 16
PC12DRVR

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USA

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Yeah it could have been alot worse, if that stuff had gone through the mains I'm sure it would have been a mess. The ironic part is the previous two flights I had been practicing piroetting circuits and some non stationary piroflips so when it started spinning it really caused no panic, ten years ago it would have been an Oh **** and a crash, so I can't complain, its been a good flying season so far.

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08-16-2010 02:58 AM  8 years agoPost 17
rudyy

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E. Amherst, NY

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I do not understand why there are always something on a 700N that would fall apart by itself without a crash. Just name a few I have seen the posts in the past here: broken main blade grip bolts, broken tail shaft, broken tail pitch slider etc and now here comes the broken tail blade grip bolts??

I do not have a 700N, but it totally freaks me out. Do you guys prepare for a crash due to some parts possibly falling apart at any time per flight?

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08-16-2010 03:17 AM  8 years agoPost 18
PC12DRVR

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USA

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It freaks me out too Lol hopefully they will start putting better quality fasteners, that's the only problem I've had. Unfortunately in some critical areas.

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08-16-2010 09:24 AM  8 years agoPost 19
Kona Chopper

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Kailua-Kona, Hawaii USA

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I tried finding those MA0063 M3x10 screws at Heliproz and Heliproz South. But, they were out of stock. Found the Avants screws M3x10mm Grde 12.9 alloy steel Socket screw(8) in stock. http://www.heliproz.com/prodinfo.asp?number=100422. I ordered a package. Cheap insurance. By the way this tip about upgrading the screw for the tail grip was mentioned on "smacktalk rc" episode 7. I just watched the video tonight, then saw this post..



Why buy?? when you can borrow and no return

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08-16-2010 03:03 PM  8 years agoPost 20
Entityofme1

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Birmingham, AL.

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Unbelievable or maybe not.
Wow what are the odds of this happening to me just yesterday and feeling like I would be the first person to post about this or ask if this is unusual? I've had my 700 for roughly around 3 months and I've flown probably 15 gallons on it with no major issues. Yesterday on my third flight doing some elevator tic tocs one of the blade grips flies off and almost immediately thereafter, just as the original poster decribes, the tail jumps straight off the back of the boom about 10 feet away. Having flown higher quality machines than the Trex 700 and being able to depend on bolts for the most part, it's very discerning that here a company would rather save $5.00 instead of using higher qaulity metal for the hardware provided in the kits. Honestly how much would higher qaulity bolts cost and is this going to wreck your bottom line for profit? I suppose align makes these bolts using ground up pencil leds and adds a litle bit of plastic to stiffen them. We already knew the frame bolts sucked with their ultra nifty design using the shallow head which will round off just by putting a 2.5 hex driver within 3 feet of them. We could live with that. No big deal right? We buy a $18.00 washer and bolt kit to upgrade them and fly away some more. However with things like this and parts flying off the heli at high speeds it makes me question if every single freaking bolt on the thing is garbage and needs to be replaced (or the entire heli for that matter). Maybe this is how they manage to keep the heli so light weight.

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