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HelicopterAlignT-REX 700N › Build Review & First Flight Impressions
07-11-2008 10:45 PM  9 years agoPost 1
bkervaski

rrElite Veteran

Birmingham, AL, USA

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I haven't flown it yet but if my TREX 700 flies as good as it builds it will be the best heli I've ever flown.

In true Align fasion, the TREX 700 is a very easy build. I only had one issue and that was the primary tail control rod carbon tube's hole wasn't big enough for the ball link rod. Beyond that, I think I could have just shaken the box hard and it would have gone together - by far the easiest 90 I've ever built.

A lot of neat design choices - the pics don't do it justice. It's a very sturdy model.

The canopy grommet design is the best I've seen yet and of course the canopy is beautiful.

The fit and finish was great, 10/10 imho compared to other models.

I wasn't sure if I would like the "look" of the model but it definitely grows on you as your building - there is nothing that wasn't thought through. A good example is the blade grips fit to the head. On most models, you can't rotate the blade grips 360 degrees and if you did something would be scratched. There's almost unnoticeable groves cut into the head to allow the grips to slide through. Little things like this throughout the model.

The fan design is slick, very innovative, I like it a lot.

The new shimming method to get your main gear mesh is also very innovative.

This model leaves almost no room for guest work which I like.

The fuel tank is massive and I appreciate the thought put into the design with the extra hole cut for my pressurized fuel delivery system.

All of the parts are very high quality and everything fit perfect. I keep saying this because it's so rare to get a model that the parts just "fit".

With the "boxed" mainframe design, it should crash well.

I haven't weighed it but compared to my Synergy it's very light.

The entire build took 6 hours. This included my engine and servo installation. Radio gear took another 2 hours. I consider myself an above average builder (yea, I crash that much, lol)

Things I would have liked different: I would have liked a thicker or graphite tail control rod. The radio gear tray, although very spacious, could you some more thought. There's no clear way to mount the battery and no easy way to run straps for securing gear. I would have liked less "rounding" of corners in the head and bearing blocks and a more industrial look (personal preference, not a flaw by any means).

Another build note, if your tail control rod seems a bit short your tail shaft isn't in all the way, there's about another 10mm left in there when you think you're meshed up with the gear box. Gently tap on the metal tail box to get it in the rest of the way and everything will line up just fine.

If you have a YS91-SR it fits perfect just make sure you use the outside hole on your fuel tank for the clunk. The inside hole puts the fuel tubing at an awkward angle that I didn't like.

I'll update this again when I finish with the head geometry but the book lengths look pretty close.

Kudos, Jason Kraus, another fine design, great job!!!

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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07-12-2008 01:43 AM  9 years agoPost 2
myaces

rrVeteran

North Bend, Wa

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Sounds great, you will have to give us your first flight opinions.

You mention using the outer hole on the fuel tank, I'm running the YS91 SR and am using the middle hole. I think that was the one shown in the build and it seems the clunk (I'm using OS bubbleless) works really well from the middle, it can reach a lot of the areas of the tank, I'm curious if it will work as well from the side?

No clear way to mount the battery? I guess we should start posting pics as I had some choices there and don't know if I like it. I ended up putting the battery on the top, it works well and there is an area for putting in a strap to hold it down. I put the receiver on the left side (from the front of heli), it works ok and there is a way to strap it down, the only thing I don't like is I can't see the wires going into the receiver very well.

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07-12-2008 06:03 AM  9 years agoPost 3
Locktite

rrVeteran

N.J

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Here are some pics of my wiring..I have the option of mounting the battery on the bottom of the tray or in the right side of the front radio tray, now I just need to decide on which lipo to pick up...I drilled tiny holes in the front tray so i can run zip ties to better secure my servo wires and gyro wires...



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07-12-2008 11:01 AM  9 years agoPost 4
JAGNZ

rrProfessor

Auckland, New​Zealand

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VERY tidy wiring. Nice.


Jason Greenwood

www.3dheli.co.nz

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07-12-2008 01:58 PM  9 years agoPost 5
bkervaski

rrElite Veteran

Birmingham, AL, USA

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@myaces,

I'm using an OMI Fuel Magnet. I did have an issue with the stopper sealing the tank (leakage under pressure). I'll see if I have it fixed today.

I ended up mounting some gear on the "underside" of one of the mounting tray bays and that let me successfully mount my battery on the bottom and strap it through the bottom slot. Worked out well. Flying in a bit.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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07-12-2008 10:52 PM  9 years agoPost 6
swasey1982

rrApprentice

La Ceiba, Honduras

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wow I NEED ONE !!!

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07-13-2008 10:50 PM  9 years agoPost 7
bkervaski

rrElite Veteran

Birmingham, AL, USA

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Been flying all weekend, what a great and confidence inspiring model. If flies very similar to the 600N but with a big presence and of course more power. I found it very easy to get aggressive fast.

The Radix 690's are a perfect match. Very fast but stable response with the Super Stubz (no weights).

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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07-15-2008 04:23 AM  9 years agoPost 8
myaces

rrVeteran

North Bend, Wa

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Here are some pics of my build.

Yes I know that's an 8717 on throttle, it was buy three get one free.

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