RE: Walkera #4 Fixed Pitch Helicopter Forum  
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    • All Forums >> RC Helicopters >> Electric RC Helis >> Walkera Helis - Dragonfly, etc.. >> RE: Walkera #4 Fixed Pitch Helicopter Forum
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    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/24/2005 9:30:28 AM   
    oops


     

    Posts: 664
    Joined: 2/26/2005
    From: Perth, AUSTRALIA
    Status: offline     		I've been clipping the trailing edge to increase the aspect ratio of the blade - that doesn't get as much head speed increase as tips, but does maintain stabilility at a lower RPM.

    DAvid

    (in reply to chris6414)
           Post #: 126

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/24/2005 10:42:18 AM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline     		a little tip that i found out about these walkera fixed pitch heli's. this works for both the #4 and the #22d. They use the same rotor head and blades. if you remove the little plastic nuts that fit inside the blades and shave off about a 1/32" from the end that goes into the blade as a bushing. you can then tighten them up enough to prevent movement of the blades. other wise the plastic nut bottoms out and you will strip the nut out before you get the blades to stop moving about in the rotor head. before each flight you must visually align the blades. If you do that and carefully balance the blades the little helis seem to fly pretty darn stable. keep in mind though that you can still induce the wobbles from violent manuvers or slowing down from high speed flight too quickly.

    (in reply to oops)
           Post #: 127

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/31/2005 6:14:33 PM   
    chench


     

    Posts: 77
    Joined: 4/24/2005
    From: EdinburghScotland, UNITED KINGDOM
    Status: offline     		Does anyone want a 72 MHz reciever? 'Cos i got one lying around that i cant use because my transmitters on 35 and cant send back 'cos i opened the packaging so im gona sell it cheap. Nothing wrog with it to the best of my knowledge. E-mail me at pip.tabor@btinternet.com

    (in reply to mazakari)
           Post #: 128

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/15/2005 7:07:16 AM   
    rctoysinchina


     

    Posts: 2
    Joined: 3/17/2005
    From: Hangzhou, ND, CHINA
    Status: offline     		We have a great number of walkera dragonfly No.4 in our UK store. They are 40 MHz in radio frequency that means cannot be used in UK. So we will sell them to Germany, France, Ireland, Italy and Spain in the lowest price . Welcome your inquriy .
    Email : li_pp828@yahoo.com.cn

    (in reply to chench)
           Post #: 129

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 5:54:03 AM   
    SeaBear


     

    Posts: 60
    Joined: 6/25/2003
    From: Iowa Park, TX,
    Status: offline     		hello all from the latest victim of helifever. i got my dragonfly 4 yesterday and need some help. i've read this thread and there are alot of what seem like great ideas but there's so many i don't know where to start. here's where i am:
    extremely violent shaking prior to what i think would be lift off
    i moved to my living room floor which, i guess sort of helped. the carpet absorbs some of that shaking which may only be masking bigger problems
    after that i begin to get lift off but it seems to want to dive right so i shut it down
    after my latest session (which ended with a snapped tail rotor) my battery and tail motor seemed a bit on the warm side. not too hot to touch but warmer than they did after my 1st go round.
    what should i do? can i fix the tail rotor or do i need to replace? how do i get this thing in the air? how long do i charge the battery and do i store it charged or leave it down? the so called manual said to do it for 2 hours before the first flight but what about after that?
    i would appreciate any help you veterans can give me. i'm new to this. i actually bought and assembled a raptor 30 a couple of years ago but chickened out and sold it before i got it in the air.
    also, any suggestions on how to make my radio work with the sim? my cord won't work with either simulator. i downloaded FMS and it wouldn't work with either. am i missing something or do i just have a bad cord?
    thanks again.

    (in reply to hrwatson68)
           Post #: 130

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 9:44:32 AM   
    Crashnet2000


     

    Posts: 31
    Joined: 9/14/2005
    From: , SWEDEN
    Status: offline     		I have the same problem with my new Dragonfly #4... I shakes like mad before lift off and when it starts to lift like 3 mm from the ground it starts to flip over to the right side !

    OK i thought and started to play with the controler without diconnecting the battery wich was the dumbest thing i have done "i think".
    I played with the dip switches on the back and all of the sudden the damn thing goes wild..... i turned of the radio controller but the helicopter gave full throotle and started to glide around so i jumped in and grabed it. Almost took my eye out when i tryed to disconnect the battery....
    When i was trying to disconnect the battery it started to smoke from the receiver "4in1", now i am sitting here with a broken rotor head core, fryed receiver and broken tail boom !
    When i opened the receiver up i could see one chip standing up! hmmm it seems that i can solder it back...
    Can someone explain what the hell happend when i was playing with the dip switches.. I think it was the second one up that i toggled to the left ?
    Why does i wooble around like a maniac ?

    < Message edited by Crashnet2000 -- 9/24/2005 9:46:40 AM >

    (in reply to SeaBear)
           Post #: 131

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 10:23:04 AM   
    oops


     

    Posts: 664
    Joined: 2/26/2005
    From: Perth, AUSTRALIA
    Status: offline     		Wobbling? It's the result of too low a headspeed when flying, or a serious balance issue on the ground.

    Get the blades as tight as is practical. So they are stiff to move. Align them by hand. An imaginary line that passes through both screws on the head would intersect about the middle of the tip edge.

    Make sure the paddles are horizontal and flat to the flybar.

    Use enough throttle to get off the ground.

    And never play with the dipswitches while the transmitter is turned on. One of them will go to full throttle.

    David

    (in reply to Crashnet2000)
           Post #: 132

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 10:48:09 AM   
    Crashnet2000


     

    Posts: 31
    Joined: 9/14/2005
    From: , SWEDEN
    Status: offline     		i swear i will never play with them again !
    The damn rotor spins so fast when it hit me yesterday in the arm i thought it would brake the bones....

    (in reply to oops)
           Post #: 133

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 12:15:46 PM   
    mazakari



    Posts: 97
    Joined: 2/25/2005
    From: Norwich, UNITED KINGDOM
    Status: offline
    quote:

    ORIGINAL: Crashnet2000

    Can someone explain what the hell happend when i was playing with the dip switches.. I think it was the second one up that i toggled to the left ?


    Hi Crashnet,

    The dip switches are used to reverse the servo functions (and throttle as you have found out!! )
    Example, if left stick low is throttle off and left stick high is full throttle, then reversing the throttle dip will give you left stick low 'full throttle' and left stick high will then become throttle off.
    This is the same for the servo's, flicking the roll servo dip switch, left will become right and vis versa.
    When checking these things its always worth disconnecting your motor. That way you won't give yourself a painful suprise!!
    When setting up the throttle, remove both your main and tail blades so again you have made the heli 'safe'.

    As for the wobble, as OOPS posted, you need to tighten the blades and align them as he has said. The heli does have a tendancy to drift near the take off point, this is due to its light weight and the collective yaw coupling effect. Once the heli is in the air and out of ground effect it will become a lot more stable.
    The best way to get it into the air is to increase power so it becomes light on its skids and then just 'punch' it up into the air (get it through ground effect as quick as you can).
    Once you have it a couple of feet high in the air it will become a lot more stable. As you become more proficient you won't have to use this method as you will naturally counter the effect without thinking about it.

    Hope this helps a little and you can get your heli back together soon,

    Jon


    < Message edited by mazakari -- 9/24/2005 12:17:23 PM >

    (in reply to Crashnet2000)
           Post #: 134

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 9/24/2005 3:42:30 PM   
    oops


     

    Posts: 664
    Joined: 2/26/2005
    From: Perth, AUSTRALIA
    Status: offline     		Nearly broke your arm?

    You're lucky it was a Walkera 4 !.. Otherwise, you would be feeling a LOT more sore...

    Bigger heli's with wooden blades will easily break your arm, and possibly worse. Plastic blades will splinter, but still do considerable damage. At least the Walkera 4's are reasonably safe when you tangle with them.


    Of course, on FULL throttle, that would be a little worse than the normal human-contact incidents most of us have.

    They are reasonably safe to play with generally, except by playing with the dipswitch, you bypassed the safety.

    The usual method for turning on is something like this... (For a Walkera 4)

    1. Turn on transmitter. Set throttle LOW.
    2. Turn on heli, while maintaining a GOOD grip on it.
    3. Place Heli on level ground.
    4. Briefly turn heli OFF. (Interrupt carrier signal).
    5. Turn back on.
    6. Check swashplate servo's are moving freely, then apply power slowly until rotor spins. Check tail rotor operation.
    7. Fly.

    Step 4 and 5 are far from ideal, but do reset the gyro. If you are confident with the heli, you can omit 1 and 4. I usually hold my heli's so that they are safe and I can kill the power quickly if there's an issue. Usually by the skids and tailboom in a wide grip with my right hand. Then if there's radio problems, I can kill the power quickly and safely.

    As mazakari says, punch it up from the ground. Once you get skillful, you can take off into a 2cm hover without thinking,