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HelicopterAlignT-REX 700N › Torque tube is approx 10mm too short!
12-23-2008 07:33 AM  8 years agoPost 21
mchammer

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California,USA

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anybody have a measurement of how much boom is showing when fully inserted in the frame? I want to double check mine without taking it apart.

Peace Through Superior Firepower!!!

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12-23-2008 06:04 PM  8 years agoPost 22
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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Now that's a great question!!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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12-28-2008 03:05 AM  8 years agoPost 23
Filby

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Adelaide, South​Australia

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Boom is 786mm in total length and the inside when seated correctly is 705mm.

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12-29-2008 03:23 AM  8 years agoPost 24
heli3dmax

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DuBois, PA USA

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Torque tube to short, or boom to long?

I to was going to start this thread a long time ago but didn't because I was afraid of the same old... Hey dumb a$$ did you get your boom slide in the whole way! The answer is yes I did.

I opened the slot in my boom a little deeper and a little wider than the factory and my torque tube is as much as 10mm to short as well.

I measured the depth of the tail boom case to where the boom would stop with the pin on the back side of a set of dial calipers then slid the boom in the whole way until it bottomed out with the slot fully engaged and put a piece of masking tape around the boom at the end of the tail boom case.

Then I pulled the boom back out and measured the distance from the end of the boom to the tape and the distance is the same as the depth of the tail boom case.

With that being said once the aluminum tail case is slid on the boom with the torque tube fully engaged in the front of the heli the torque tube does not in my honest opinion engage the aluminum tail case nearly a safe amount.

I will order a new torque tube and a new boom to see if the dimensions on the new equipment are the same and if I come up with the same results as I have now I will cut off the front of the boom and extend the slot in the front until I get what I feel is the same amount of backlash I'm running with all my 600's that are fully adjustable.

All this being said I feel my tail pushrod was to short as well so I made my own carbon fiber push rods for the front and rear instead.

Thanks to all who read and view,
Ronnie L.
Team Air Thunder

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12-29-2008 07:40 PM  8 years agoPost 25
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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Taipan,

So with your boom inserted into the frame, and your tail case inserted onto the boom, how much boom is exposed between the rear of the frame, and the front edge of your metal tail case?

My boom, which I believe is inserted correctly, is showing 27 1/2 inches.

Also, I measured my aluminum boom which I did not use, and it's full measurement is 30 7/8 inches.

Are these numbers close to what you are seeing?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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12-29-2008 10:28 PM  8 years agoPost 26
Filby

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Adelaide, South​Australia

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Is it possible to use metric measurements on here as the States is the only industrialized world to still use the imperial system and all of the components on Align helis are built with metric measurements?

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12-29-2008 11:28 PM  8 years agoPost 27
Taipan

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Sydney, Australia

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Rocko,

Exposed boom on my 700 is 701.5mm or 27 5/8". Full boom length is 787mm or just shy of 31". Therefore BOTH of your measurements are about 3mm or 1/8" shorter than mine which proves your boom is fully inserted.

Btw I measured inside of holder and amount of boom inserted, both are exactly 60mm. Therefore fully inserted but guess some still won't believe me!

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12-30-2008 12:24 AM  8 years agoPost 28
Filby

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Adelaide, South​Australia

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Taipan

My exposed boom is 705mm when inserted properly which is 4mmm longer than yours. The heli is from the first batch that hit aussie shores and as far as I can tell the TT is seated correctly. The heli has done about 50 flights without any dramas.

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12-30-2008 01:03 AM  8 years agoPost 29
Filby

rrApprentice

Adelaide, South​Australia

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Ive just gone out and pulled the TT out and the tail off to take some more measurements. My boom wasnt fully seated as I backed it out during the build as per instructions. So the fully seated exposed length is 701mm.
My TT is a total of 823mm in length.
The tail case from where the TT bottoms out to where the boom is fully seated is 19mm. With the TT fully seated in the 'frame drive end' there is 14mm of 'teeth' exposed to be seated into the tail case THEREFORE this allows for 5mm of 'slop' in the TT from end to end which I would say is perfect and also makes the instruction to back out the boom a bit null and void.

Taipan, I guess if your TT and boom is the same length you will have the exact same end play and this wont cause any problems.

Fil

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HelicopterAlignT-REX 700N › Torque tube is approx 10mm too short!
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