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Thread: Bluebird servos

  1. #61
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    Re: Bluebird servos

    Here is our official announcement about Blue Bird servos.

    http://rccanucks.com/showthread.php?...3504#post43504

    We are real excited about carrying this line of servos.

    Thanks,

    TBoltrc.com

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    Member PaulD's Avatar
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    Re: Bluebird servos

    Was looking for a single servo large enough to manhandle the ruder on my Tucano by itself. - putting in an iGyro and there is only one rudder output channel. Ordered an H50a from Tbolt and hooked it up for a test drive. Feels really strong and seems to center really well. Nice and fast on li-fe's - runs 620 @ 6v and 0.12s. Gears are all steel helical (first I've heard of that - not really sure what the benefit is) and a really nice all aluminum case.

    Time will tell but I've been using Bluebird servos that I got from H-K for a while and none have shown the slightest hiccup and the gear trains have stayed tight.

    PaulD

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    Senior Member Machzx's Avatar
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    Re: Bluebird servos

    helical gears are stonger because you lay the teeth on an angle gives more surface contact also more precise mesh less slop
    they are quieter too
    most heavy duty gear boxes are like this
    the rear end in you car
    only to ways I like to drink !!
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    Senior Member Pete's Avatar
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    Re: Bluebird servos

    Quote Originally Posted by Machzx View Post
    helical gears are stonger because you lay the teeth on an angle gives more surface contact also more precise mesh less slop
    they are quieter too
    most heavy duty gear boxes are like this
    the rear end in you car
    All my high end helicopters main drive gear is helical, very durable.

    Pete
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    Member PaulD's Avatar
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    Re: Bluebird servos

    Quote Originally Posted by Machzx View Post
    helical gears are stonger because you lay the teeth on an angle gives more surface contact also more precise mesh less slop
    they are quieter too
    most heavy duty gear boxes are like this
    the rear end in you car
    Yes, I get that. Precision in gearing has more to do with the shaping, hardening and finishing process than just making them helical. We design/build specialty transmissions at work and other than noise haven't really seen a benefit of going from straight to helical unless they're ground gears but you have the added issue of having to deal with the trust loads.

    The gear train does feel really tight in this thing - closest I've seen to some of the higher end Futabas so I'm pretty impressed overall.

    Cheers,

    PaulD

    P.s. - it's been killing me resisting the temptation to pull the thing apart.

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    Senior Member JoeT's Avatar
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    Re: Bluebird servos

    Quote Originally Posted by PaulD View Post

    P.s. - it's been killing me resisting the temptation to pull the thing apart.
    I've pulled mine apart a few times to check things out. Other than the funky fine O-Rings they were very straight forward and the bearings were pretty high quality. That O-Ring was a pain to put back.

    This chart is pretty cool, it's got the frequency and voltage range for the entire line of servos:

    http://www.blue-bird-model.com/all%2...frequency.html

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    Re: Bluebird servos

    I've heard it said somewhere that the servo gears are about at their max at 600oz-in (I know... don't beat me up.. that's a pretty general statement). Just wondering if they decided to play it safe and go helical??

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    Re: Bluebird servos

    Quote Originally Posted by tbrum View Post
    I've heard it said somewhere that the servo gears are about at their max at 600oz-in (I know... don't beat me up.. that's a pretty general statement). Just wondering if they decided to play it safe and go helical??
    Makes sense that there is some limitation, assuming no advancement in material (including all the things Paul mentioned), you can only make a gear so big and still fit it in a standard servo case.

    I would say, if all other variables are the same, there is no question that a helical gear get allows more surface contact between gears and smoother engagement allowing for tighter fit...that said, is it needed? I really don't know, but I know I want it!!

    I suppose the only drawback to the helical gear is that the gears need to be retained for vertical movement better...one gear is going to want to move up, and one gear down under load. Maybe that's why the heavy aluminum lid...for those that have looked inside one, is there any chance we are going to be wearing out bearings quicker due to the helical gears side loading them?? Or are the gears retained by pins or some other means to their shafts independent of the bearings??

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    Senior Member Cosmith's Avatar
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    Re: Bluebird servos

    Post man was good to me today! Have to get back at the Vertigo so these have a home...
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    Re: Bluebird servos

    Opinion question, all shelf jokes aside.

    I bought Trevor's 3DHS 91" Yak 55M airframe on a whim with really no budget to piece it together. Ended up spending a bunch of coin on it to get stuff that I like, such as the GP61 rather than an EME or DLE. With the reputation of Bluebird continually growing I felt pretty safe to save some money on servos, so I went with BLS-4210s...what isn't there to like about a brushless servo with 659 oz-in of torque at 0.09 sec for $80.

    Here's my issue, on the ground they seem to move 'ratchety' rather than smooth. I thought this might be radio/frame rate/gyro related, but I tried everything short of changing radio brand to no avail...ie. DSM2 w/all available rates, DSMx with all available rates, both with and without gyro and all of the above on 6.6v as well as 8'ish v. They also occasionally jitter a bit. Pressure on the control surface seems to smooth them out to a degree and also stop the jittering which is most frequent on the rudder.

    This video shows them at their absolute best, the issue is most obvious on the rudder in the second half of the video: https://goo.gl/photos/SoAA3V1XVCpHXefbA

    All that said, I have 15 or so flights on the plane now, and don't notice this the slightest bit in the air...it is dead smooth and does only what I tell it to do.

    So, my question is, is this a case of a defective or poorly designed servo, or is this simply a part of high speed, high torque digital servos? Based on the 15 flights so far I'm not overly concerned, just deliberating with myself about whether or not I should prod Bluebird to replace them with something different.

    Thanks!

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