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T-REX 700 › Trex 700 - what gives ?
03-24-2017 12:42 PM  18 months agoPost 1
Evolusia

rrApprentice

UK

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Hi, just moved on to a 700e F3c and as this is my first Align heli I was wondering if you guys could point me in the direction of what usually fails on a tail strike ie what gives in the drive line. Also where do you get the part numbers for spares. I've been a Hirobo and Rappy fan up until now and spares have been a doddle to sort out whereas there have been several changes in the drive line of this model and no obvious info on what fits with what. Maybe I've just missed the info but there aint no pn's in my manual.

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03-24-2017 01:20 PM  18 months agoPost 2
FNFAL

rrNovice

Dayton OH

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Indeed it's been many a year since Align removed the p/n's from the manual.

But in Lieu, Align has put out a "Parts Finder" application that you can use for slewthing a part number.

http://shop.align.com.tw/partfinder.php

As far as release versions, that is a difficult thing to track, especially for a "new to Align" owner. You almost have to "live through it" as Align does continuous product improvement on the fly even between official new releases.

Usually whatever is being sold by a vendor is the latest version of something and more than likely downward compatible.

Never hurts to get some front/rear umbrella gears for the gearcase/tailcase.

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03-24-2017 07:42 PM  18 months agoPost 3
Evolusia

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UK

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That's what I thought to do, however do you know if there was a problem with the original white gears or did Align have to upspec the material when they started to put more power through the heli. I'm a bit perturbed that I may have to fork out for main gears, auto hub and tail drive gears if I have an oops moment with the tail.

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03-24-2017 08:34 PM  18 months agoPost 4
FNFAL

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Dayton OH

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White works fine - I still like them and use them. Really didn't need improving. But occasional poor meshing by some builders did cause some occasional tooth damage. If you shim for tight backlash, you're OK.

Black was supposed to be more strong, but it wears faster at speed and more brittle at lower temps due to the introduction of hardening material.

Red is suppose to be where it's at...

This is a nice upgrade if you really want to maintain your mesh.

http://www.rc-tek.com/store/i2rc-t7...ount-p2300.html

But go out and fly and enjoy. Just inspect gears every so often.

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03-24-2017 10:06 PM  18 months agoPost 5
NQNA

rrElite Veteran

USA

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I have personally had a failure of the white gears. I have been using the black gears on my 700 since that failure. Since the cost of the gear failure maybe very high, I'm moving to all reds on my 600's and 700. MHO

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03-25-2017 01:20 AM  18 months agoPost 6
Evolusia

rrApprentice

UK

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I've already shimmed the gears so that's taken care of but I like the idea of a belt drive option.

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03-25-2017 01:27 AM  18 months agoPost 7
Evolusia

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UK

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I see a missing pick off spur gear there. Is that a common failure. Did you stall the tail rotor or did it fail in flight. My set up is the flybared version with the low kv motor and I wont be running above 1900 rpm head speed since I am only into lazy big air stuff.

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03-25-2017 02:35 AM  18 months agoPost 8
NQNA

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USA

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It failed in flight, unfortunately. It did not show any wear before the failure and literally made a loud bang when it failed. Very costly.

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03-25-2017 03:18 AM  18 months agoPost 9
FNFAL

rrNovice

Dayton OH

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One note, is that IC engines with their power pulses tend to be a little more harsh then electric - especially on polymers. If prime motivators are engines (especially single cylinder) usually a service factor is introduced. Not saying don't go Red, but just say'in.

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03-25-2017 11:01 AM  18 months agoPost 10
Evolusia

rrApprentice

UK

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NQNA, what style of flying do you do, are you running very high head speeds, DFC head?

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03-25-2017 02:50 PM  18 months agoPost 11
FNFAL

rrNovice

Dayton OH

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I have a friend in Vegas - happens to be the dry cleaners to a bookie. The guy told him that the odds makers have it 3 to 2 that the next Align gear color will be green, with 5-1 on blue and a distant 12-1 on yellow. I'm hoping on green for the obvious reasons...

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03-25-2017 03:46 PM  18 months agoPost 12
Evolusia

rrApprentice

UK

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Belt or tube?

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03-25-2017 03:52 PM  18 months agoPost 13
JuanRodriguez

rrProfessor

The Villages, Florida

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Probably tube....

I don't think the issue exists with the belt....

I remember that when I had my R60 you had to be "on guard" to keep the tail from coming into contact with the ground....like during an auto, etc....

If you did and got away with it, the gears would get damaged and subsequently fail during subsequent flights.....

I know it's a different heli but the issue is the same.... weak gears.

Or is that "bad piloting" ??

Been there, done that and old enough to know better.....

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03-25-2017 06:32 PM  18 months agoPost 14
Evolusia

rrApprentice

UK

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Sorry Juan but I was asking about the the piccy above. The option to convert to a belt drive for the cost of a major rebuild of the TT is quite appealing. To be honest I bought this heli sometime ago against better judgement about TT drives and I still don't see that there can be that much performance benefit between belt and tube. There is sure to be a profit difference in the spares department though. The reason I started this thread was to see what parts, if any, were regular failure points. Could be a big bill for an easily made mistake especially if I can't replace the original parts and have to buy the newer versions.

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03-25-2017 06:36 PM  18 months agoPost 15
Evolusia

rrApprentice

UK

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FNFAL. I like your choice of head as well. They may have gotten DFC heads to work ok but they are not good enginneering to say the least.

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03-25-2017 06:51 PM  18 months agoPost 16
FNFAL

rrNovice

Dayton OH

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Thanks for the comment. Even Align's new offerings are sans DFC. The minute I spun up a dfc head with the servos disconnected and my hands manipulating the swash at speed on the bench and feeling the pop-and-lock of the head linkages, (more than a break-dancing contest) that was enough for me.

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03-25-2017 08:59 PM  18 months agoPost 17
NQNA

rrElite Veteran

USA

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Well Evolusia, I've never had any problems with the DFC heads on several Align helicopter from 450 500 550 600 and 700 versions. I do see that Align is going away from them. I did just buy the 550 three blade head for my second 600. That head is DFC with a control arm on the swash.

With the white gear failure, I was flying an OS 90 at 2000 RPM. I was doing consecutive rolls in high speed backwards flight when it failed. I general consider that I'm a mid range 3D pilot, but definitely not a sponsor range one.

It's funny how model helicopters started with wire tail drives, then went to belts, then to carbon fiber drive shafts and now moving to belts again. I have had all but the carbon versions fail, so it will be interesting to move back to a belt in the future.

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03-25-2017 11:34 PM  18 months agoPost 18
FNFAL

rrNovice

Dayton OH

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Rigid spindles - no?

"I did just buy the 550 three blade head for my second 600. That head is DFC with a control arm on the swash."

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03-26-2017 01:16 AM  18 months agoPost 19
NQNA

rrElite Veteran

USA

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It still has dampers

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03-26-2017 02:50 AM  18 months agoPost 20
FNFAL

rrNovice

Dayton OH

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Interesting...but the one I see still has the traditional swash driver...must be a different one.

https://www.amainhobbies.com/align-...h004xxt/p525627

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