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HelicopterMain Discussion › Trex 700
12-21-2016 03:14 PM  10 months agoPost 1
Peter WalesrrElite Veteran - Orlando Fl - My Posts: All  Forum  Topic

I bought an unflown trex 700 at OHB a couple of weeks back, and today I thought I would start getting it ready for flight. I was very impressed with how smooth the tail drive was, in either direction, until I looked at the maingear, pinion mesh.

I am just starting to get into Trex's for scale applications and am not very familiar with them. So, what do I need to make the pinion and the main gear meet?

The maingear has a bolt through it with no nut on the other end, which suggests that the builder just threw the first maingear on he found, so I guess it's the wrong one. The V2 I have has a helical maingear and straight cut tail drive. This has a straight cut main gear and helical tail drive. What do I need to get?

Peter Wales
http://scalehelicopters.org

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12-21-2016 03:17 PM  10 months agoPost 2
Heli_Splatter

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USA

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drive pinion and main gear are wrong. Should be slant also.

Trex800 Manual calls it; CNC Slant Thread Main Drive Gear 110T
Motor Slant Thread pinion gear 13T

I believe these parts are the same for both birds.

Not sure what head speed you are planning etc. 6S or 12S

My tail drive gear is white, not black. Your gearing is rather smooth and unencumbered. I would say that the builder destroyed the original parts during the build and did not know the right parts to get. If this is so, I would be careful and go over the build extensively.

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12-21-2016 03:50 PM  10 months agoPost 3
gt48

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Kingston, Ontario - Canada

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The skids are on backwards too lol. Not a big deal. I assume you've moved the motor as far towards the main gear as you can?

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12-21-2016 05:06 PM  10 months agoPost 4
Peter Wales

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Orlando Fl

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Skids are coming off and going in the trash, its for a scale bird

The motor mount does not move, but I haven't looked at it to see if the motor mounts in slots, I'll get right to that. Thanks

Peter Wales
http://scalehelicopters.org

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12-21-2016 05:50 PM  10 months agoPost 5
Peter Wales

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Orlando Fl

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I took one look at it and decided that as the bottom mount for the motor shaft was fixed, something else was wrong, but then I took a second look.

As you probably know, the whole lot is adjustable on sliders and after releasing 8 screws, I could slide the motor into mesh.

Thanks again, now for the next problem, whatever that may be

Peter Wales
http://scalehelicopters.org

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12-21-2016 05:59 PM  10 months agoPost 6
tgalo

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USA

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Must have the KDE mount. V2? Great flying machines.

Gravity's a bitch ant it?

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12-21-2016 07:08 PM  10 months agoPost 7
Heli_Splatter

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USA

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Any idea how old this machine is?

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12-21-2016 10:38 PM  10 months agoPost 8
chopper37

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NJ and Long Island

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Looks like a V1, I knew the trex lama would get you hooked on trex's lol great flying helis and great parts availableblity

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12-22-2016 01:06 AM  10 months agoPost 9
RAK402

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Alhambra, CA

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I have the first version of the Trex 700E that came with the FBL head (pre-DFC).

That looks exactly like mine.

Nice flying machine, by the way.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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12-22-2016 02:56 AM  10 months agoPost 10
Peter Wales

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Orlando Fl

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I have no idea how old it is. It has never been flown, none of the screws have loctite on them and are not very tight so its a major rebuild to check everything.

The motor mount is very different from the other V2 machine I have, it has 3 pieces. The motor mount itself and the two pieces which slide into it to make it adjustable. The bottom bearing mount is the same. Is that stock or after market?

You are right, the other V2 I have made me pick this one out of a selection of other helis which did not have flybars. Even for me, a dedicated scale guy, a flybar heli is much more fun and less stress than messing with a head gyro, I love flying it. This one is going into a Vario EC135 and will probably keep the flybar. I will be aiming for 1350 -1400 rpm headspeed like on the other two 700's I have.

Peter Wales
http://scalehelicopters.org

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12-22-2016 12:13 PM  10 months agoPost 11
chopper37

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NJ and Long Island

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EC 135 great choice, I was planning on that one, but after buying the 3 bladed head and tail going with the lama for my 700.

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12-22-2016 03:04 PM  9 months agoPost 12
tgalo

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USA

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The motor mount itself and the two pieces which slide into it to make it adjustable. The bottom bearing mount is the same. Is that stock or after market?
Nice, either KDE or Lynx mount. I had a Lynx mount that had a piece of carbon fiber holding the two pieces together. To my knowledge Align never had a adjustable motor mount for their 700s but I could be wrong.

Gravity's a bitch ant it?

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12-22-2016 04:20 PM  9 months agoPost 13
chopper37

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NJ and Long Island

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The holes for the motor mount are oval loosin motor screws on motor adjust mesh.

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12-22-2016 08:15 PM  9 months agoPost 14
Peter Wales

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Orlando Fl

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Not on this motor mount. They are fixed. The mount and bottom bearing holder are adjustable so I have it perfect. There are other KDE parts on the model so I guess this is a KDE design.

The next problem I am left with is no balls on the elevator lever and no servo arm(ring) on the servo. I have made up the push rods, fitted balls and slid a servo ring on the servo. I am damned if I can get even one of the links on the elevator pitch lever. No access. I guess I am going to have to take a lot apart to get access.

I have had enough for one day, I'll have another go tomorrow.

Peter Wales
http://scalehelicopters.org

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12-22-2016 08:29 PM  9 months agoPost 15
chopper37

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NJ and Long Island

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Oh ok must be the KDE, and yea the elev linkage is a pain in the butt, sounds like you worked it out though.

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12-30-2016 10:40 PM  9 months agoPost 16
icanfly

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ontario

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and make sure you align the lower bearing mount so there's no lateral deflection of the motor shaft before tightening everything.

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01-06-2017 09:41 AM  9 months agoPost 17
DTM

rrApprentice

Belgium

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From what i can see on the picture, the motor shaft is to short to engage the lower pinion bearing.

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