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Blade 400 › 3D Tail Servo Boom Mount
04-05-2009 05:46 PM  9 years agoPost 1
pro-tour69

rrNovice

Michigan

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Hi Guys,

I am in the middle of upgrading my tail servo to a jr3400g and mounting it onto the boom. I am at the point of installing the two servo mounts and have a few questions for those that have done the mod.

1. Does it really matter which way the servo is oriented (front/back) and (left/right side of boom) or is it just personal preference based on wire routing and looks?

2. Does the orientation of boom mounts themselves make any difference?

3. Should I use the brass inserts for mounting the servos or leave them out?

4. I thought I read somewhere where you can heat up one end of the tail rotor push rod to pull off the link but I can't remember which end and I couldn't find anything when I did a search. Can this really be done or am I just confused again?

As always thanks in advance,

Scott

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04-05-2009 11:17 PM  9 years agoPost 2
supra6

rrApprentice

Singapore

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At the end of the day the only things that will matter will be that you get full throw on the servo and it's location on the boom to have no drift in rate mode.
http://www.helifreak.com/album.php?...pictureid=12728
Having said that there are a few other things:
1) Most people keep the srvo on the left side of the heli in the hopes that when the crash happens the boom will take the brunt of the blade strike rather then the servo.
2) As it is a fairly large servo try to keep it as far forward as possible, when adjusting servo position to get o drift in rate you move the servo mm's at a time and leaving an inch from the rear should give enough room to adjust in the future.
3) Two options for the control rod, one put the non adjusting end in some boiling wwater, i have been told takes about 3 min to loosen up the glue to get it off, second is my perfered method just cut off the nonadjusting end and cut the rod to the desired length and install a new ball link.
4) Now the trickey part, the mounts can go on the boom two different ways, the servo can mount on the mounts 2 different ways. If you have a spare boom, slide the mounts on and see how the servo arm lines up with the center of the boom. Do the usual to the servo first, plug it into the rx and get it centered WITHOUT trim or subtrim, then see which servo horn gives the best line up for the arm being 90 degrees to the case. Now experiment with the different orientations of mounts and servo till you find the best geomerty to give the control rod running down the center of the boom and the spacing of the rod the same distance from the boom as the distance of the tail slider arm from the boom, ie the rod paralell to the boom. The rotation of the mounts on the boom will determine the straight shot to the tail pitch control arm. Take you time and see what looks best.
5) As for the rubber mounts seems it's 50/50 weither to use them or not. I do, isolates vibration, used with the brass eyelets gives a secure mount and any movement you get will be in a rotational direction, laterl (forward and reward) is quite tight.
Sorry this was so long winded I must have to much time on my hands.

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04-06-2009 12:56 AM  9 years agoPost 3
pro-tour69

rrNovice

Michigan

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Supra6,

Thank you very much for all the detailed information. After reading through your post I would have made a mistake at just about every step.

Now off to work...

Scott

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04-06-2009 01:12 AM  9 years agoPost 4
supra6

rrApprentice

Singapore

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Just a note, forgot to mention. When detremining the whole to use on the servo horn, seems to be 10mm (8-12mm) distance from the center is about average. There is a trade-off, further out give quicker speed and less torque but requires more spacing from the rod to the boom. Further out yeild less TX gain because you have more mechanical gain, I have been told that you really do not want to run over 80% gain, has to do with the longevity of the servo. I don't know it's all Greek to me.
What I try to do is find 2 arms that are close to 90 on the case, usually each arm has 3 wholes, drill out the wholes for you balls this way, one servo with the middle whole and the other with the inner and outer, install the balls on each (one on the arm with two wholes) this way when you head out to the field to do your setup and you want to experiment with the different offsets you just change the servo arm

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