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Post by osidak on Mar 3, 2012 9:02:51 GMT -4
Been busy as hell the past few weeks and thus almost zero time to work on the heli. Got my metal servo mount in and that worked a charm (rear most cyclic servo)
Finally yesterday I was able to sit down and start working again - building the rods that go from the servos to the bell cranks - think the over all length of the rods was supposed to 50mm and then once the ball joint ends where in place the length between the ends was saying 40mm
found the rods to be ~ 3mm short (each) and when I set the distance between the links to 40mm I can not get the servo arm on the servo gear. The distance off is about the radius of the servo gear. I would open up the distance some but I am afraid that will not leave enough threaded rod in the ball links.
Guess I will run off to the LHS and see if I can find some new rods.
Come to think of it never heard back out the couple of bearings that where very notchy. Guess I will need to call instead of email in regards to that
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Post by Valkman on Mar 3, 2012 10:00:38 GMT -4
This is a TT and not belt right? The lengths are are different. Also the servo wheel has to be on the bottom like the picture here for them to be 40mm with the servo wheel shown. It also shows you how much thread is left on mine with 40 mm gap. Hope this helps Attachments:
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Post by osidak on Mar 3, 2012 11:30:36 GMT -4
Yes it is the TT version - I am using the instructions for the TT version - Actually the gap per the manual is 41mm which they are something like 41.09mm as that is the closest I could get them to 41mm with out being under.
My problem is that they seem to be too short. Also from your picture it looks like your bell crank is not level. I assume that is so you could get the picture of the measurements (thanks by the way)
I can take a snap of it on Monday and post it
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Post by Valkman on Mar 3, 2012 12:27:48 GMT -4
Its level alright. Just the picture. Its hard using your left hand to take a close pic while holding a caliperr! I could not get it "Bang On" either as one turn you could be over and one turn back you could be under. The main thing is they are both the same. If you loosen the servo there is a bit of give on it in the frame if needed. Depending on the servo of course.
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Post by osidak on Mar 3, 2012 13:38:58 GMT -4
will try that - I got the combo kit so the servos are "phoenix" or something like that
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Post by Dr. Evil on Mar 3, 2012 14:35:56 GMT -4
Not sure if this will help but my measurements is 41.5mm and from center to center of the ball links is dead on 70mm.
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Post by osidak on Mar 3, 2012 15:30:07 GMT -4
that half mil would probably work - just worried that I will not have enough threaded rod in the ball link ends. Guess I can get them to 41.5 and then mark it and take them apart to see what is left
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mike
ROOKIE
Posts: 8
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Post by mike on Mar 4, 2012 0:20:02 GMT -4
Has anyone flipped those servos around. I have been looking at my manual tonight and looked at a couple of pictures and have seen some with the servos flipped to get a 90 degree angle on all linkages. I looked at the align manual as well and they have the servos flipped where the servo wheel is at the top seems to me that would give you the best setup. Just curious before I start my build tomorrow.
Mike
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Post by Valkman on Mar 4, 2012 5:34:57 GMT -4
I had them flipped with the orange canopy. When I got the Skull canopy the wheel rubbed the canopy. You can shove a towel or something into the canopy and heat it up with a drier to loosen the resin so it will expand. Or you can put extra canopy mounts on the frame to hold the sides out.
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mike
ROOKIE
Posts: 8
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Post by mike on Mar 5, 2012 14:45:16 GMT -4
Valkman
Did you notice any advantages from having them flipped. I have looked at several trex manuals and the 600esp manual for trex has them the same way as the chaos manual. So I may just build it that way I fly scale ships and only pod and boom when testing out mechanics.thanks
Mike
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Post by Valkman on Mar 5, 2012 14:53:34 GMT -4
I did not get a chance to fly it that way as I was waiting on parts. I'd say I would not notice the difference anyway to be honest mainly because I'm only back flying a few months after a few years break and the difference is so small I'd say only a pro would notice.
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Post by osidak on Mar 5, 2012 18:36:26 GMT -4
Ok here is a picture of the right side of the heli - Front is facing right in the photo I know I am doing something wrong but not sure what - linkages measure top - 43.49mm bottom - 41.33mm Both should be the same but doing that makes the bell crank sit at an angle and also the top linkage is such that there is not enough threaded rod inside the ball link end to actually hold and it will pull out with a little force in very short order Someone please let me know what I am doing wrong
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Post by Valkman on Mar 6, 2012 5:00:35 GMT -4
Is the servo sitting even with any gaps the same each side of it? If it was my heli and the links are short ( as you said in your first post ) I would not trust them in the first place. This is a heavy bird and the links have to take all the strain. You do right to post here and make sure.
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Post by osidak on Mar 6, 2012 8:19:32 GMT -4
Currently the servo is as far left in the hole as it will go (closer to the bell crank).
Just to confirm
The bell crank should be level with the top of the frame and the balls on the servo arm should be verticle (straight up and down when compared to the servo)
I noticed my bell cranks are different than all the other pictures I can find but not sure how that will affect the lengths if at all
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Post by mainblades (Barry) on Mar 6, 2012 8:37:19 GMT -4
Ok here is a picture of the right side of the heli - Front is facing right in the photo I know I am doing something wrong but not sure what - linkages measure top - 43.49mm bottom - 41.33mm Both should be the same but doing that makes the bell crank sit at an angle and also the top linkage is such that there is not enough threaded rod inside the ball link end to actually hold and it will pull out with a little force in very short order Someone please let me know what I am doing wrong Looks like to me. The bell crank in the pic is on the wrong side of the heli. With servo wheel and bell brank at 90 degs. The ball should be in the center of the 2 elevator servo mounting holes. Barry
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