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T-REX 700 › Tail rotor shaft break
01-23-2013 12:44 AM  4 years agoPost 1
hondamgn

rrNovice

SoCal-USA

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Is this common in a new 700E DFC PRO? after 41 flights no hard landings or crash? since i bought it brand new last november this just cut into half? Mid air,Luckily i was able to land safe, blade grip still intact? But still in idle up when it happened?

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01-23-2013 12:49 AM  4 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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Ever have any crashes or the tail touch the ground?
It does seem a little weird with one 41 flights.

Bill Whittaker

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01-23-2013 06:00 AM  4 years agoPost 3
Toddc72

rrNovice

weed,ca-usa

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Not uncommon. Does happen. Seems to be hit and miss though. They already have a new shaft upgrade out for it. Shaft is now 6mm all the way out and not turned down like the older ones are.

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01-23-2013 01:01 PM  4 years agoPost 4
RDBill

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Sicklerville, NJ

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01-23-2013 02:41 PM  4 years agoPost 5
rcflyerheli

rrKey Veteran

Granbury, TX USA

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There is major thread coverage on this issue over on the "other" forum. Align has come out with an upgrade that incorporates a one diameter 6mm shaft and a new tail hub that fits it.

There are still some issues with the new upgrade. The new black umbrella gears material swells as it cools, and it has to be sanded down before you can get it into the rear bearings without destroying them. Also there is a machining tolerance discrepancy in the shoulder that locates the new shaft in the tail box. It is too short by about .1 to .2mm and allows the shaft to move side to side. Kyosho makes a shim set that is sold by A Main that has .1, .2, and .3mm 6 x 8mm shims for around 5 bucks. That will fix the end play issue.

Another thing that everyone is finding is that the chordwise cg on the stock tail blades is off and they are heavier than other aftermarket blades. In some cases as much as 1.5g. Due to the speed of the tail, this is causing a harmonic vibration in the tail that weakens the old step down tail shaft right at the point where yours broke.

I have been running the new tail on three different helis, and it looks like the fix is working for me.

Good luck.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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01-23-2013 06:45 PM  4 years agoPost 6
knightofcarnage

rrElite Veteran

chicago

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The new black umbrella gears material swells as it cools, and it has to be sanded down before you can get it into the rear bearings without destroying them
You can get them with out sanding. They are harder to get in then the standard. Even in a vice grips i was not able to mar the gear. They are super durable. I have zero slop on mine.

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