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 - 7/29/2005 1:48:00 PM   
    hrwatson68



    Posts: 259
    Joined: 1/1/2005
    From: Dexter, MO, USA
    Status: offline     		Your receiver is on 72mhz, so just changing the crystal wont change it to 30mhz. You need to get a receiver that is on your mhz.

    _____________________________

    Fly it like you stole it! Happy Flying! - HRW

    (in reply to chench)
           Post #: 101

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 7/29/2005 2:34:21 PM   
    chench


     

    Posts: 77
    Joined: 4/24/2005
    From: EdinburghScotland, UNITED KINGDOM
    Status: offline     		If i just get a new crystal for my transmitter will that solve it, or is the transmitter on 35 mhz only?

    (in reply to mazakari)
           Post #: 102

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 7/29/2005 11:31:05 PM   
    hrwatson68



    Posts: 259
    Joined: 1/1/2005
    From: Dexter, MO, USA
    Status: offline     		your original radio is whatever it was when you bought it, i.e. 27,35,72,75. Your radio wont work with that reciever.

    _____________________________

    Fly it like you stole it! Happy Flying! - HRW

    (in reply to chench)
           Post #: 103

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 7/30/2005 6:29:54 PM   
    chench


     

    Posts: 77
    Joined: 4/24/2005
    From: EdinburghScotland, UNITED KINGDOM
    Status: offline     		arite thanks il just have 2 change my reciever

    (in reply to mazakari)
           Post #: 104

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/8/2005 7:01:14 PM   
    chris6414



    Posts: 624
    Joined: 12/23/2004
    From: Warminster , PA, USA
    Status: offline     		I just ordered one of these little helos and was wondering if anyone has tried an 8.4 AA pack? Would it be too heavy? They have almost three times the capacity of the AAA stock packs. What would be the down side to going with the 8 cell 9.6 pack? Need a resisitor for the tail motor to help it last? Have flown a .30 raptor that is my friends before but they are a little too pricey for me. thanks

    (in reply to oops)
           Post #: 105

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/8/2005 8:19:36 PM   
    hrwatson68



    Posts: 259
    Joined: 1/1/2005
    From: Dexter, MO, USA
    Status: offline     		My Walkera Dragonfly came stock with the 8.4 packs and it is way under-powered. I had a nice flight going a couple week-ends ago, and it would barely climb-out, then it crashed and broke stuff i have not even checked yet. I have had no tail motor failures as yet, but the resistor is well talked about when it comes to the motor not burning out fast. I'm thinking that the 7.4v LiPo is the way to go for this heli, save weight and fly longer too. I think there was talk a while back about clipping the main rotors down to give the heli more head speed to stabilize the flight. Hope this helps.

    _____________________________

    Fly it like you stole it! Happy Flying! - HRW

    (in reply to chris6414)
           Post #: 106

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/8/2005 8:58:04 PM   
    chris6414



    Posts: 624
    Joined: 12/23/2004
    From: Warminster , PA, USA
    Status: offline     		I'd be afraid to clip the rotors for fear of messing the balance up. I was just wondering what the max weight for a battery pack would be for this bird. I found a 7.4 Li-poly with a PCB mounted on it(2 cells looks like AAs) but it limits the current draw to 5 amps. Won't let you over discharge or overcharge though and looks super light. [image][/image]


    Specs are 2000 MAH and weighs 3.6 oz Anyone know what the max current draw for this helo is?

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    < Message edited by gysgt6414 -- 8/9/2005 3:24:10 AM >

    (in reply to hrwatson68)
           Post #: 107

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 12:03:11 PM   
    oops


     

    Posts: 664
    Joined: 2/26/2005
    From: Perth, AUSTRALIA
    Status: offline     		Those batteries are too heavy and too underpowered...

    Even if you get three of them. I've tried it with 2 and 3, which I took from Laptop batteries.

    It just hovered in ground effect.

    Anyway, you want something 1200 mAh max anyway. And about 7 to 8 amps draw capacity or more. And certainly to have the capability to supply that current at full voltage.

    The round batteries have current limiters built in. That causes a reduction in the available voltage, which means lower voltage at the motor, and lower headspeed = no flight.

    Look for a small flat LiPo pack.... Something around 7C minimum...

    Mine flies really well with a 1200mAh 10C battery And flies for ages.

    I'm also the one who clips rotor blades. If you clip them symmetrically, they are fine, and besides, they are not that balanced to begin with. Too much variance in the manufacturing technique.

    Don't beleive me? Wait until you lose a full centimeter from the tip of one... Sure, it will shake, but it still flies OK.

    Not that you should leave it like that, of course. A missing centimeter is way too much. (Any missing is not good).

    You can also add an 8 cell battery as well. That works pretty well. The extra weight needs more headspeed to get liftoff, and supplies more voltage as well.

    David

    (in reply to chris6414)
           Post #: 108

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 12:46:14 PM   
    chris6414



    Posts: 624
    Joined: 12/23/2004
    From: Warminster , PA, USA
    Status: offline     		David, what brand of Li Po do you use? Link? I'm looking for the long flying times, but I heard with the LiPos you have to watch the disharge(flight time) in order to ensure you don't overheat the pack. Do most have a safety to keep the pack from self destructing? I thought I read in here of someone flying it till it was dead and it was so hot you couldn't touch it and the battery swelled and was most likely, ruined. Any truth to this? Thanks.

    (in reply to oops)
           Post #: 109

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 12:55:44 PM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline     		gysgt6414,

    just throwing in my experience with using lipo's in my #4. I have a couple of 7.4v 860mah Thunder Power lipo's. they are pretty light and provide enough power to fly around for 12 to 15 minutes each. The nice thing about using the 7.4 volt lipo's is that the tail motors seem to last longer. I fly until my Helicopter will not stay aloft any longer. When I put the battery on the charger the volt meter indicates approx. 7.4 to 7.6 volts. rarely if ever do I go under the rated voltage of the battery. If you use a 7.4volt lipo that is greater than 1200mah it will most likely be to heavy to fly out of ground effect. it will last a long time though.

    (in reply to chris6414)
           Post #: 110

    RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 1:08:42 PM   
    oops


     

    Posts: 664
    Joined: 2/26/2005
    From: Perth, AUSTRALIA
    Status: offline     		Hi gysgt6414,

    I'm not an expert, but here's what I've found out about LiPo's.

    Keep in mind I could be wrong, and there is variation to this.

    1. Don't discharge past 3v per cell. That will damage or kill them.
    2. Don't charge over 4.3v per cell. That will explode them. 4.2 seems the common voltage to aim for.
    3. Don't trickle charge them.
    4. Don't exceed 1C charge rate.
    5. Don't exceed the rated "C" discharge rate.
    6. Don't puncture or damage them.
    7. Don't let them overheat. Sunlight can overheat them. They will go into "thermal runaway" and explode.
    8. If they are puffed, they are stuffed.
    9. Use a proper charger - If it hasn't got a