Thread: "Warning" Torsion 106mm tail blades in Trex 700N

I have flied about 20 flights with these Torsion 106mm tail blades in my Trex 700N. I use original tail with plastic bladeholders. Yesterday I lost other tailblade after two minutes flight - you can guess the rest. Landing was very "unhappy". Both bolts where on place, but blade has gone broken - see the picture. Be careful -these blades are not really made for flying

- 4D -

That dosent look good!

Anyone else had this happen with these blades?

The blade on the left has been ripped out but the one on the right looks to have a metal collar still in place, how is this possible if the bolt ripped through the blade mounting?

John

Nice back drop rubbish blades. Their main blades aren't much better in my opinion.

I've been using them on my Aurora for ages now - not seen that issue, thankfully!

Cheers,
Rob

Yes unfortunatly it was me and the result was a smashed up 700

See in my pics the brass collar was still on the bolt and then the blade came apart.

Like Jamie says though I contacted Petr and did get a very quick result and very satisfactory too with the out come.

And I did use some again with no issues might I add.

pm me for more details if you like.

That,is simply NOT good

Do the brass inserts come glued in? One thing I don't like about the tail grips on the 700/600 is that the grips don't have a flush contact with the root of the blade. It means that if the brass insert comes loose, it can slide along the blade bolt leaving the tail blade loose on the bolt and with only the carbon to hold it in place.

Has this ever happened on anything other than an Align heli? I was always very careful with NHP to glue them in properly as this was a concern after seeing it first hand.

Looking at the image again, the area where the brass has been apparently pulled through the root does not look wide enough for it to pass through?? Hence my questioning of the brass inserts position at point of failure.

My guess is that this wouldnt of happened had the brass inserts been sandwiched on both sides by the grip

Either way, its not good that they came loose (unless they are glued by the user) and also not good the way the grips have been designed.

I was told at the time of my incident someone said to me did I not check the brass insert as they always did as a matter of caution.

I dont think in my case it would have made much difference though.

The CF around the insert AFTEr the accident was very weak and flexable so that would have been how it came of the bolt.

Originally Posted by Tom Burgess

Looking at the image again, the area where the brass has been apparently pulled through the root does not look wide enough for it to pass through?? Hence my questioning of the brass inserts position at point of failure.

That's easy to explain, I'd lay odds that the apparently narrow section between the bushes start position and their final position is very soft broken carbon, which has sprung back after the bush passed through.

As already stated, I'd contact Petr, he's a pretty decent bloke.

Originally Posted by Jamin_00

I was told at the time of my incident someone said to me did I not check the brass insert as they always did as a matter of caution.

I dont think in my case it would have made much difference though.

The CF around the insert AFTEr the accident was very weak and flexable so that would have been how it came of the bolt.

Yeah totally understand that. However, add to that the fact that if the brass insert was loose, vibration on a tail spinning 9000 rpm upwards would soon eat through the root. I make it a mandatory step now with any new blades to wick some thin CA around any brass bushings.

I'm not saying you have to as I believe they should be ready to fly out of the packet, but I believe it reduces the chances of this happening.

Originally Posted by Janek

That's easy to explain, I'd lay odds that the apparently narrow section between the bushes start position and their final position is very soft broken carbon, which has sprung back after the bush passed through.

Yep, that is likely the case and in fairness you can see the loose carbon returning on the right hand blade.

Originally Posted by Tom Burgess

...One thing I don't like about the tail grips on the 700/600 is that the grips don't have a flush contact with the root of the blade. It means that if the brass insert comes loose, it can slide along the blade bolt leaving the tail blade loose on the bolt and with only the carbon to hold it in place...
.

I thing that this is part of the main problem: tail grips don't have a flush contact with the root of the blade and there is space for brass collar to slide along the blade bolt (and sooner or later it will slide if it is not glued properly). Anyway I have used Align original tail blades, Radix tailblades etc. without broblems with original bladeholders.

- 4D -

Hi,

I got letter from Torsion company last week. They have inspected the broken tailblade and answer was: "whit big probability it was mistake if material. We opened that tail blade whit my workers and all layers of the carbon are in the right position like is usually in that process".

- 4D -

So what is going to happen now.

Bear with them as it took time in my case but it was excellent customer service I received from Petr.