RE: Walkera Dragonfly #36  
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    • All Forums >> RC Helicopters >> Electric RC Helis >> Walkera Helis - Dragonfly, etc.. >> RE: Walkera Dragonfly #36
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    RE: Walkera Dragonfly #36 - 7/16/2008 3:18:17 AM   
    babyhuey



    Posts: 552
    Joined: 9/3/2007
    From: St. James, MO, USA
    Status: offline
    quote:

    ORIGINAL: Chophop

    The S3114's went out today. I couldn't reach Servo City on the phone and got scared they were one of those problem vendors. I guess not. Osterizer on RCG says S3114 servos are about as good as an HS-56HB but not quite. To me that means they are ok but not as good as an HS-56HB.
    Still hard to imagine a $15 servo as good as a $25 servo. This might be the result of some new production technique or maybe a marketing plan to gain happy customers. Any way, I just hope they are good. I really should have just gotten another set of HS-65HB's so I could simply move them to another heli if needed.
    3 S3114's weigh 22.5g . 3 HS-65HB's weigh 34.5g . I save 12g with the S3114's. And the S-75's are 27g for 3, so again I save ~5g with the S3114's.
    On the smaller Cp2-BT, 12g is a good loss. One problem I have with it is it lifts of with the pitch so small that it easily flips around between zero and the tiny bit the CP2-BT needs to fly. I get some yoyo intermittantly. So I hope the tighter Futaba servos will correct that slop error the S-75's have.


    CH


    Chop,
    Your gonna like the 3114s. I have one on the tail of my 36 and it works very well, Fast , strong and centers well. The only thing is that they have the wimpyist servo arms you have ever seen.
    They also have smaller mounting dimensions which you are already aware of.
    With a better arm they would be one of the best small servos available.

    Huey

    _____________________________

    Tail motors? We don''t need no stinking tail Motors. Walkera 36, Comet , GMP Cobra 50, Kalt Baron Whisper, Koyosho Caliber

    (in reply to Chophop)
           Post #: 11151

    RE: Walkera Dragonfly #36 - 7/16/2008 5:49:02 AM   
    Junkz0r



    Posts: 55
    Joined: 6/25/2008
    From: Melbourne, AUSTRALIA
    Status: offline     		Wow!

    I can't really complain.. that Hitek servo (HS-56HB) that I ordered yesterday arrived today.

    How's THAT for fast service?

    Almost ready to rumble!




    _____________________________

    Aussie! Aussie! Aussie!

    (in reply to babyhuey)
           Post #: 11152

    RE: Walkera Dragonfly #36 - 7/16/2008 10:01:32 AM   
    Junkz0r



    Posts: 55
    Joined: 6/25/2008
    From: Melbourne, AUSTRALIA
    Status: offline     		Hi again! Sick of me yet?

    I'm still in the hunter/gatherer stage of bits for this bird. I swear it better be worth it

    I do have a question though regarding the Walkera gyro. If you note in the pic it is a G001 gyro... Do I need to replace this? And what might you recommend for not stupid monies?

    edit: oops soz about the multiple pics.. the preview doesn't show them lol :\



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    _____________________________

    Aussie! Aussie! Aussie!

    (in reply to Junkz0r)
           Post #: 11153

    RE: Walkera Dragonfly #36 - 7/17/2008 2:19:37 AM   
    babyhuey



    Posts: 552
    Joined: 9/3/2007
    From: St. James, MO, USA
    Status: offline     		OH!
    The G001 is a problem child. I don't think that any of them work properly. My experiance with them is that they will hold the tail too well. What ever direction that you initiate it in is the direction that it will stay locked onto. If you start it pointing north it will always want to point north! Good if you want to follow your heli out of the woods.
    You can use it for basic hovering but not for flying around. Get the Telebee or I have had good luck with the $40 Xmseller gyro. The Gy401 Futaba is the benchmark gyro but for $140 I never could justify spending more for the gyro than I have in the rest of the heli.
    I just remembered that Hobbycity has gyros for cheap and one of them is the same as the Eflight.

    _____________________________

    Tail motors? We don''t need no stinking tail Motors. Walkera 36, Comet , GMP Cobra 50, Kalt Baron Whisper, Koyosho Caliber

    (in reply to Junkz0r)
           Post #: 11154

    RE: Walkera Dragonfly #36 - 7/17/2008 3:10:41 AM   
    Chophop


     

    Posts: 1812
    Joined: 7/13/2006
    From: Greenup, KY, USA
    Status: offline     		I have heard of that G001 true head-lock problem !

    I am in the process of professionally analyzing gyro drift. My first finding is that some types of slow drift are not the gyro drifting. It is the heli drifting and the gyro is not able to detect slow drift such as the steadily increasing CCW drift tendancy caused by the battery droop causing head speed to droop as the battery discharges. The tail looses speed and the heli will usually start a light left drift.

    Assume a top view of the heli here.

    I put a G006 on a board, and slowly rotated it at the speed my CCW drift happens. The gyro did not detect it and deflect the servo arm.
    Then there is the temperature drift that will cause the servo to creep as it warms up.

    WELL ! We have something to work with here. Your heli will drift CCW as the battery discharges. The gyro will creep one way or the other depending on how the servo direction is set. Let's say the switch is set so the tail servo will creep CW over some time. The trick is to orient the servo on the tail boom so that the creep will counter the left drift caused by battery discharge.
    How well this will work is an experiment on the board. I have some finishing work to do on my CP2-BT and my 36 is due for some 600 flight maintenance. Bless it's heart, it can go quite far when setup well.

    CH

    _____________________________

    No stupid comments for now.

    (in reply to babyhuey)
           Post #: 11155

    RE: Walkera Dragonfly #36 - 7/17/2008 4:17:46 AM   
    babyhuey



    Posts: 552
    Joined: 9/3/2007
    From: St. James, MO, USA
    Status: offline     		Interesting! I think that the only way to stop the slow drift is to raise the gain but only if you have a high speed servo or the tail will wag. THis is why I think that a good precise and fast servo is vital.
    I don't know why the G001 works the way it does but all of the G006s I've seen work very well with a good servo. They drift in the cold though.

    _____________________________

    Tail motors? We don''t need no stinking tail Motors. Walkera 36, Comet , GMP Cobra 50, Kalt Baron Whisper, Koyosho Caliber

    (in reply to Chophop)
           Post #: 11156

    RE: Walkera Dragonfly #36 - 7/18/2008 2:25:33 AM   
    Junkz0r



    Posts: 55
    Joined: 6/25/2008
    From: Melbourne, AUSTRALIA
    Status: offline     		Hi its me again

    I've been looking at these Telebee gyro's but I'm not certain on which model I should be getting for a 400 class heli, and do I wish to get one that I can use on other models in the future??

    I'm still very much a noob when it comes to actual flying so clearly for the first months I'll be flying in normal mode with no desire to try any 3D until I'm completely comfortable controlling it in normal mode.

    I also need a pinion gear for that Scorpion motor I got. The shaft diameter is 2.97mm, Will the align pinions fit or do you guys use something different? Chopchop reckons I want a 12t?

    Cheers
    Junkz


    _____________________________

    Aussie! Aussie! Aussie!

    (in reply to babyhuey)
           Post #: 11157

    RE: Walkera Dragonfly #36 - 7/18/2008 2:40:41 AM   
    Chophop


     

    Posts: 1812
    Joined: 7/13/2006
    From: Greenup, KY, USA
    Status: offline     		You probably measured the bell shaft. The power take-off (PTO) side should be 3.17mm (1/8 inch). I assume you have the HK2208-28, so I have tested the 12t to be excellent for newb to mid skill flying. It will be very nice to the batteries also. I think a 13t would be for some moderately serious 3D and cause more power draw than you would like for now. Even an 11t would be good.

    Here are some Ikarus numbers :

    11t steel #67109
    12t steel #67611

    These Revco Pinions are the last pinions you will need or at least for a LONG time. I use them.

    http://www.readyheli.com/RevCo_Pinions_s/109.htm

    You will want the .5m 3.17mm bore 11,12 t .

    CH

    _____________________________

    No stupid comments for now.

    (in reply to Junkz0r)