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walkera 4#3q cobra hover attitude

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walkera 4#3q cobra hover attitude

Old 02-12-2009, 01:37 AM
  #1  
pissedoffpete
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Default walkera 4#3q cobra hover attitude

My little heli has an extreme tilt to right side. I tried adding weight to left wing tip, no help. Should I send it back? Can this be fixed? I thought maybe changing thrust angle on tail rotor might affect its tilting. Any ideas? Also, can I make it more stable by adding weight to flybar paddles with heavy tape?
Old 02-12-2009, 02:05 AM
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bad400
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Default RE: walkera 4#3q cobra hover attitude

have you tried leveling the swashplate?
have you tried adjusting the linkage from the servo`s to the swashplate?
have you tried centering the servo arms?
have you done any preflight setup`s that HAS to be done on ANY heli?
Old 02-12-2009, 05:14 AM
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Tedstrickland
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Default RE: walkera 4#3q cobra hover attitude

Are you talking about uncontrolled movement to the right, or the fact that while in a hover, it tilts about 20 degrees to the right side?

The tilt or lean, while in a stable hover is normal for any heli with CW main rotor rotation (viewed from the top), and a tail rotor, even the real ones. Simply, it has to do with the torque of the main rotor. If the main rotor turned the CCW, then it would lean to the left. The counter-rotators do not do this, as the two main rotors cancel each other out.... This is discussed in a number of places, so search for one of the artcles on helicopter flight dynamics or rotorheads.

If the problem is the former, then check as Bad400 lists, and make sure your set-up is correct. Ted
Old 02-12-2009, 05:35 AM
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Tedstrickland
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Default RE: walkera 4#3q cobra hover attitude

Oops, missed the second question.....

The flybar set-up and paddles are critical to successful flight with the 4#3B or 4#3Q. When this is just perfect, assuming that everything else is good, especially the swash, then you should achieve a very stable hover and FFF. Make sure each side is exactly the same length. Adding weight makes the qyroscopic effect more pronounced, thus increasing stability, as does increasing the weight of the paddles and making the flybar shorter. I prefer the stock 4#3 flybar, as it has detents on it that aid alignment.

I have added MIA microflight tip weights to my 4#3B and 4#3Q, however, the MIA flybar has no detents and is just slightly longer than the stock metal flybar (stay away from CF flybars). Minor mod is the the MIA weights must be very slightly drilled-out to fit the stock Walkera flybar. So, I recommend stock Walkera flybar, paddles with the MIA weights.

You can also buy metal beads with a 1.0mm hole and get some 1/32 o-rings to hold them in place. MIA also has a kit for this.

Finally, you can put a slight amount of positive pitch into the paddles, as this will help with hovering. For good forward flight. the picth of the paddles must be neutral.

Again, flybar and padle set-up are critical to good flight characteristics for the 4#3 series. I recommend you stay away from tape, chewing-gum, goo or anything else other than carefully balanced weights on the flybar. I check mine before every flight, and after every crash [X(]
Old 02-12-2009, 03:32 PM
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TIA
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Default RE: walkera 4#3q cobra hover attitude

How extreme of extreme tilt?

Is it actually flying to the right or hovering steady but looking like it "wants" to go right?

Got any pics?

Like Ted says, most heli's lean a bit to the right slightly. Sometimes small winds and breezes will cause a lean also and you may not even feel it where you are standing with the radio.
Old 03-02-2009, 06:47 AM
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jwolee
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Default RE: walkera 4#3q cobra hover attitude

Just got a 4#3Q and can comment on the "tilt"... sorry, no pics though. In steady hover, the main rotor is tilted about 10 degrees from horizontal. The tilt seems more severe in this small heli than typical.

Anyone tell me if the 4#3B shows the same characteristic? Got my first of them coming in the mail soon. Got the brushless version and am hoping that the extra weight levels it out a bit.
Old 03-02-2009, 08:22 PM
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HansV
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Default RE: walkera 4#3q cobra hover attitude

That is quite normal. The tail rotor will try to blow the heli to the left and the rotor has to compensate for this drift. I havn't really noticed any difference between the BL and brushed version. For some reason this tendency seems less significan on larger helis.

/Hans.
Old 06-07-2009, 01:52 AM
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bad_pilot
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Default RE: walkera 4#3q cobra hover attitude

how do you level swashplate on this tiny heli?

I have swashplate leveler thinger for my bigger one (hbk2) but I am not sure if such thing exists for this small one.

I just got my 4#3q to fly around the house but it needs some initial trimming as you mentioned.

also does anyone have any pics of this heli taken a part?

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