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Tarot 450 FBL build issues


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matelot
Extreme 3D
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Joined: 09 Jan 2012
Posts: 331
Location: Back in Blighty

PostPosted: Tue Sep 11, 2012 2:46 am
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.
Ah, no probs. I looked at where you said 'Used', and took it for the past tense of what you'd done... as opposed to advising me to use... Laughing

OK, I'll source some serrated washers. Could save hassle another time trying to get them out if threadlocked. Cheers.

***********

I've now got to sort out the CF tail control rod - it's about 6mm too long overall, even with the eyes screwed in as far as they'll go. Tail slider centred and servo arm at right angles to the body.

I've looked at adjusting for length by sliding the boom back. No. Redrilling the frame to move the tail servo forward. Really rather not, but the link ball does scuff the underside of the boom box. Could turn the servo round 180 degs., but all advice says not and to keep the arm at the rear. Moving the servo arm round by about 20 deg. Best not.

Or finding a way to take off one of the threaded ferrules (could be epoxied on), and shortening the rod by 5mm.

Just when I think I'm getting there, these awkward problems crop up. Huh!
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Burgess
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Joined: 27 Mar 2012
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Location: Wales

PostPosted: Tue Sep 11, 2012 4:23 am
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Typographical error, didn't see the ‘d,' anyway I genuinely suffer from dyslexia, the letters can take on a life of their own and jump around even ones you didn't intend using elect to get in on the act.

Back to your problem:
Dose the carbon fibre rod go into crimped steel ferrules?
Crimped, that is a dimple on either side.

If the rod is 2mm diameter it goes into that sleeve about 6-7mm.
Then, with a razor-saw or junior hacksaw, cut through the rod up against the metal adapter, drill out carbon fibre stub.
Ease out the dimples with 2mm rod.
File shallow notches either side of the rod so as to aline with the dimples and refit the rod using a slow CA or a fast epoxy.
Re-dimple the sleeve light tap with a hammer and centre punch or similar.


Burgess


Last edited by Burgess on Wed Sep 12, 2012 9:08 pm; edited 1 time in total
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matelot
Extreme 3D
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Joined: 09 Jan 2012
Posts: 331
Location: Back in Blighty

PostPosted: Tue Sep 11, 2012 4:38 am
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I cleared the servo by removing the rubber grommets. They kept it about 1mm too high. The fastening screws have wide heads anyway.

So if I need the ability to lengthen and shorten with the tail slider centred and the servo horn at right angles, I'll go your way and shorten the rod.

It's 2.5mm dia. and the ferrule (uncrimped) caters for about 7mm at each end.

Thanks for the tip. Way to go.

Edit - been thinking about this all night and trying to avoid cutting the rod.
The link eyes are screwed up tight and that makes the rod exactly 345mm as per the diagram. With it fitted, the servo horn is at 90deg and the tail slider is bang on centre.

I read somewhere last night that setting 7-8deg on the tail to counter main torque (which would involve shortening the rod - the cutting operation), is not necessary as the 3-axis ZYX gyro will compensate with tail input to keep the heading. Centred slider and 0deg is fine, apparently.

Have I understood correctly, or am I way out?

Cheers
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Burgess
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Joined: 27 Mar 2012
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Location: Wales

PostPosted: Tue Sep 11, 2012 10:27 pm
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I did think it odd that you'd been supplied with an over-long rod, but these things can happen.

If the rod is the specified length,
and the servo horn is at 90 degrees to the servo,
and the tail pitch slider is dead centre.
Then do not cut the rod to shorten it.

If the servo is held hard and fast to the bracket with just the screws and no grommets, that ought to be OK, anyway watch the is vidio.
This video covers tail servo installation:
Tarot 450 Pro Build Page 16
http://www.youtube.com/watch?feature=endscreen&NR=1&v=y5rQupqaYH8

This video covers tail setup
Tarot 450 Pro Build Page 17
http://www.youtube.com/watch?feature=endscreen&NR=1&v=KXfe5-nEJXU

This is a good video covers setting up
Horizonhobby.com How To - Setup your Head Lock Gyro the easy way
http://www.youtube.com/watch?v=OlJ5TLhFA9k

Servo mount alternatives
http://www.youtube.com/watch?v=m8td9LPlrqI

Align 450 Pro V2 3GX Build Guide Part 9 First Flight & Final Gyro
http://www.youtube.com/watch?v=vQvoBPfbiBE

Align Trex 450 Pro 3gx FBL Flybarless servo horn 90 degree trick
http://www.youtube.com/watch?v=MbA-lLYd7Oo


Hope these are helpful

Burgess
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matelot
Extreme 3D
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Joined: 09 Jan 2012
Posts: 331
Location: Back in Blighty

PostPosted: Tue Sep 11, 2012 10:44 pm
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Cheers, matey, I'm sure they will be. I'll get to them later tonight (just going out for a fish and chips treat! We miss such things here in France.) Very Happy

Thanks again.

*******************

Edit:

Don't know how I missed those vids before. Head spinning with stuff and 48 chopper links in my bookmarks... Laughing Very good, Burgess. Thanks. The first one contained identical problems e.g. tight fit for the rear servo.

Now I'm still just waiting for the bottom plate from OOmodel, servo arms (split the ends) and other bits, and I can get on.

Cheers
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