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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 PM   
hrwatson68



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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.

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


 

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Status: offline 		If i just get a new crystal for my transmitter will that solve it, or is the transmitter on 35 mhz only?

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



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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.

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


 

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Status: offline 		arite thanks il just have 2 change my reciever

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



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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

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



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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.

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



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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 AM >

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


 

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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

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



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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.

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


 

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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.


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


 

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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 digital display, be suspicious.
10. If you short them, then they can become dangerous. They may explode. Put in a safe place and observe for 24 hours.
11. Charge in a fire-proof location.
12. Don't charge them in a Heli where possible.

How to read them?

eg,

11.1v 3S1P 8C 1200mAH.

11.1v = saying the obvious.
3S = 3 cells. Up to 12.6v max.
1P = 1 x parallel. You can put these in parallel.
8C = 8 x rating = 8 x 1200mA = 9600mA max = 9.6 Amps max discharge.
1200 mAH = Capacity. Will supply 1.2amps for 1 hour, or 9.6 amps for 7.5 minutes. Will fly a dragonfly for 12 to 15 minutes.

Brand doesn't matter that much, so long as they are reasonably quality. My 1200mAH is no-name brand.

David,

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 1:53 PM   
chris6414



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Status: offline 		Thanks guys. I think I'm going to try the 7.4 at around 1000 mah and see how it goes. The 11.1s seem to be noticably heavier. I can't wait to get this helo and try it out. My wife will be glad as I am a fixed wing pilot(glow) up until now (4 planes)and I won't have to go to the field on the weekend. I can fly indoors or on a calm evening in the front yard.

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/9/2005 11:57 PM   
marky1


 

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Status: offline 		I just got my heli yesterday and I was practicing today almost a sorta hover but the I crashed breaking my tail boom to pieces. Now I'm having problems removing the tail boom from the main frame, any help would be awesome. Also me head stiffener is bent and I'm finding it too week, does anyone know where I can get a stronger one?

Thanks
Mark

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/10/2005 8:39 AM   
oops


 

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Status: offline 		The new walkera 4's come with a fiberglass head stiffener.

Also, for quick fabrication, get some fiberglass prototype Printed Circuit Board. The holes are 0.1" space, and make it easy to cut to shape and file... And you can buy a piece from most electronics shops. So you can make your own head stiffener.

Just twist violently on the boom to remove from the body. If that fails or it's broken too closely, then try a drill...

David

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/11/2005 4:58 AM   
lvho


 

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Status: offline 		Hi everybody, I am new to this forum and to heli. I just bought a used walkera 4 and all of the suddenly nothing will work when I plug in the battery on the heli. Everything was working fine before. The light on the mixer blinks slowly and when I shut down the remote the servos twitch so it is getting a siganl but nothing seems to work.

Please help me out on what to do.

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/15/2005 6:35 PM   
chris6414



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Status: offline 		I just got one two and found that after turning on you need to wait a moment until the gyro does it's thing. You'll hear a twitch in the servos after you turn the transmitter on. And make sure the throttle is all the way down when you power up.

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/15/2005 9:30 PM   
thecheatscalc



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Status: offline 		hello iv ebeen inquirering on buiying a heli to train on so... please speak out if you recommend this one (and if you do where to buy it) if not PLEASE tell me WHY i really don't mind working on it a bit just as long as i shouldn't have to buy anything for the first 50 flights (minus crashes)

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/16/2005 12:28 PM   
oops


 

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Status: offline 		Hi Thecheatscalc,

The Walkera 4 is an excellent trainer... However expect to buy better servo's to begin with...

That said, I'm getting excellent results with the new generation stock servo's !!!! So maybe they are fixed now?

David

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/17/2005 2:27 AM   
junior5150


 

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Status: offline 		This question is for mazakari. I like the skids, can you give me some info on how you modded for the skids, the stock ones broke rather easily!!! Thanks!

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/18/2005 9:19 PM   
chris6414



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Status: offline 		Been practicing almost every night and can get good lift offs but then it wants to go where it wants but then again I'm new to rotory wing flight and can see some of my inputs as I try and "catch" it after liftoff. When it starts to go south I just throttle down and keep her as level as possible. I broke that flimsy fly bar last night and replaced it with a 2-56 aluminum push rod. I made it a little longer than stock in length to see how it behaves and I plan on moving the lickage in two holes tonight to see if I can slow the inputs down some. My kids love to watch it even if it is only up for about 5 seconds at a time. It is like I was told, like balancing a marble on a mirror!

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/18/2005 9:55 PM   
mazakari



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quote:

ORIGINAL: junior5150

This question is for mazakari. I like the skids, can you give me some info on how you modded for the skids, the stock ones broke rather easily!!! Thanks!


Hi Junior5150,

Quite a few people have asked about the skids . They are from an Align TRex heli. They add a little more weight to the Walkera (not too much though) which in turn makes the heli a little more stable, due to the higher headspeed.
If you go here you will see a thread on how to fit the TRex skids and on many other mods you can do to the Walkera 4. There is a lot of reading, so have a coffee handy .

Jon

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/19/2005 1:17 AM   
chris6414



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Status: offline 		I'm a believer! Blade clipping works great on this little bird. Head speed and stability increased dramatically. Only took off about 2 cm off each and wala! These stock batteries are already getting on my nerves. I get about 6 or 7 good 5-15 second hops totalling about 3-4 minutes total run time and they don't have enough go to keep flying respectfully. Li-pos here I come! I love this thing

< Message edited by gysgt6414 -- 8/19/2005 1:18 AM >

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/19/2005 9:49 AM   
!monsterhobby


 

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Status: offline 		My supplier told me the WKR 4# dragonfly has been updated few days ago. The updated components just the main motor and tail motor. Including the updated color box. New Design!

I will take some pictures soon.

----------------------------------------------

I'd like to contribute the pictures of the updated WKR 4# dragonfly, please see as below.





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< Message edited by !monsterhobby -- 8/19/2005 11:40 AM >

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/20/2005 1:19 AM   
oops


 

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Status: offline 		Hi gysgt6414

It's amazing what a little blade clipping can do isn't it !

Everything improves. Response is faster and the stability increases. The tail-nod disappears !!!... And the vibration in the head often sorts itself out.

I've started to develop some more advanced blade clips lately, and I'm getting over 10 minutes flying time from a stock Walkera 4 !!! The only mod is a little blade clipping. The rest is straight out of the box.... That's with the 8.4v battery which I had previously given up on.

There are other ways to clip them also, although my first efforts were about 2cm from the tips as well, and I still have those blades and head in my spares box.

The other advantage is that they will then fly in wind (light wind, but more than a stock dragonfly likes) and also FFF ( Almost impossible with a stock dragonfly).

David

p.s. Nice pictures Mosterhobby ! I think you captured the new model quite well !
By the way, I am still getting excellent results from the stock servo's in the new Walkera 4. Perhaps they have fixed them?

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RE: Walkera #4 Fixed Pitch Helicopter Forum - 8/22/2005 4:57 PM   
chris6414



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Status: offline 		Any pics of the new clip ideas. I have a spare set of blades as well. Any tail clipping?

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