RE: WALKERA 37

RE: WALKERA 37
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RE: WALKERA 37 - 7/5/2006 4:32 AM

MikeU

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Heliwannabe,

Mine did come with the 400 motor and the green 12v 650 mAH battery.

I will be investing in a 1800 lipo when I get an ammo holder to charge and store the battery. After seeing the videos from Utah Flyer's I am going to be cautious with the lipo. Don't want one to catch fire and burn down the house. I know they went overboard with the charging demonstration, but better to be cautious than sorry.

I have adjusted the main blades but not sure if they are too high now. I had to adjust by two turns to lengthen the control on the blue blade. Maybe I need to buy the pitch guide.

Happy 4th to all,
Mike

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RE: WALKERA 37 - 7/5/2006 6:14 AM

MikeU

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I want to purchase the 11.1v 1800 maH 3-cell lipo. What discharge rate should I buy 10C or 12C? I will also need to buy the proper charger for the lipo.

Does anyone have an on-line reseller they like to puchase from or an eBay seller? I would like to buy the battery and charger from the same place.

Thanks,
Mike

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RE: WALKERA 37 - 7/5/2006 12:34 PM

armycopter

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Hi Mike,

I have the following charger

http://www.align.com.tw/shop/product_info.php?cPath=22_34&products_id=201

You can get it from many different places, they run about $50. Just google it for the best price. The nice thing about this charger is that it will balance all three cells and also plug directly into a wall outlet. I don't charge in the field so I never wanted a charger to connect to a car battery. This one works great, however, mine usually requires a small household fan to be running on it to keep the circuits cool. I don't think they vented the casing enough (nothing happens if it gets too hot, except that it will not charge). My batteries never even get warm during charging and I am completely comfortable with this setup. This charger stops charging when peak power is reached.

I have both 10C and 12C lipos. Both work great. Both are 1800mAh at 11.1V. The 12C stays cooler after use for some reason, I'm not sure why. Both give me long flight times (I've gotten close to 1/2 hour before). This is where I got my 12C

http://cgi.ebay.com/Li-Poly-11-1v-12C-1800mAh-3-Cells-Rechargeable-Battery_W0QQitemZ6051420906QQihZ009QQcategoryZ34056QQtcZphotoQQcmdZViewItem

Take care

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RE: WALKERA 37 - 7/6/2006 3:30 AM

Heliwannabe

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I might be living a bit dangerosuly but I have been charging mine through the output port with a current and voltage lab quality power supply (series charging). I set the current limit at 1 amp and the voltage limit at 12.60 volts (4.2 per cell X 3) and monitor the individual cell voltage to make sure they are coming up equally. So far they have come up and tapered off perfectly, never more that .01 volt split per cell. This probably works because the battery is new so I do have an equalizing charger on order.

That being said "TAKE ARMYS ADVICE AND GET THE PROPER CHARGER". It will monitor and charge each cell individually to keep you out of trouble. The other issue is to not over discharge them our you will damage the battery. They say 3.2 v per cell minimum and no less than 3 volts per cell (9 volts for the 3 cell pack) under a load. My experience with four discharges cycles under my belt is the second you start to notice a loss of power your are dangerously close to the end of the minimum discharge cycle. I let it go this far once and tested each cell and had 3.21, 3.18 and 3.17 respectvely (no load) eek. Fortunately thay came back perfectly and equally on the next charge.

The pack usually come almost fully charged so pay attention on that first charge as it may be short. Mine stays perfectly cool on the charge cycle as well, and is just barely warm after and high discharge.

With a little common sense I really think the danger part is overstated and the amount of power these things deliver is incredible. The 1800 mAH is lighter than the stock battery and delivers roughly three times the power (or run time). With is low internal resistance you will see a considerable increase in motor power because the voltage under load does not drop off as much as with the nicad pack. Hence my hot motor issue (see previous posts). Yes I do have a burshless motor and ESC on order.

Sorry that may be way too much information but I cycle nicad batteries on a daily basis at work (aircraft emergency batteries) and I am really impressed with the lipos.

Jim

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RE: WALKERA 37 - 7/6/2006 9:59 AM

balance_mind

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Also planned to move forward after the DF04.

Any ideal which is better? DF37 or DF60?

So far the posts here have move positive comments than the DF60. However, DF60 posts were alot more.

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RE: WALKERA 37 - 7/6/2006 12:29 PM

armycopter

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I think it's all personal preference, however, it looks like the metal mainframe of the 60 causes serious glitches. From what I've read in the 60 thread, most people HAVE to upgrade the TX/RX (another $200). My 37 has been pretty much glitch free (knock on wood), although I am replacing the servo's today because of something that happened on my DF4 (they use the same servo's).

quote:

ORIGINAL: balance_mind

Also planned to move forward after the DF04.

Any ideal which is better? DF37 or DF60?

So far the posts here have move positive comments than the DF60. However, DF60 posts were alot more.

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RE: WALKERA 37 - 7/6/2006 11:54 PM

armycopter

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Just ordered 4 hitec HS-55 servo's for my 37. Decided to replace all four when I realized the stock servos were the same as my DF4. My DF4 had both servo's freeze up and die. Luckily it was on the ground. I didn't want that to happen to my 37 while in flight. I think my wife is going to shoot me tonight so this may be my last post... another $60...

By the way hobbypeople is having a $10 off sale if you spend $25. I got 4 servo's for about $46, which seemed pretty reasonable.

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RE: WALKERA 37 - 7/7/2006 3:34 AM

balance_mind

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I have changed my DF04 servos the 2nd day it arrives. Totally crapy. They just stuck after a few directional checks.
Although they have replaced with towerpro servos, but they aren't good. They still glitch. Have tried Supertech and looks good.

The flow of posts for DF37 seems to slow down. Does that mean not many are having this machine? Or no problems? Or still observing on their machines?

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RE: WALKERA 37 - 7/7/2006 5:25 AM

MikeU

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Today I ordered a Lipo 1800, Lipo Charger, Align 430L Brushless Motor, Align 25A ESC and Align Metal tail Servo Brackets for my DF37. I should have them sometime next week. I can't wait.

Army, What part number did you order for the DF36 tail servo control rod? Once I move the servo to the tail I would like to use the shorter DF36 control rod.

I adjusted the length on the tail servo rod today to try and stop the heli from turning left. But once I move the servo I have to re-adjust.

I will update once I get all the parts.

Thanks,
Mike

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RE: WALKERA 37 - 7/8/2006 3:05 AM

armycopter

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Mike, I have to apologize, I can't seem to find the part number. I even went to the walkera sight and looked at all the parts for the 36. The HM-36-Z-27 is something that I ordered but was not usable. Now I can't figure out where I bought my servo rod. It's about 12 inches long (roughly) with a ball screw that attaches to the tail and nothing on the other end. (Just the rod bent like a Z so it fits in a hole on the servo arm). I'll keep looking to see if I can find the part number. I have bought so much stuff for this thing that sometimes I can't keep it straight.

Catch you guys later - Mark

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RE: WALKERA 37 - 7/8/2006 7:59 PM

Heliwannabe

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Mike when I put the tail mount on I re-used my old rod shortening it just enought to allow the servo to be 1/10 inch from (aft) of the main body. Of course you loose the threads at one end but you still have adjustment at the other end and or course you can slide the servo up and down the taill boom for the course adjustment. I used a pair of wire cutters to make many scores (indentations) on the end I cut and glued it to the eyelet with JB Weld. I was absolutly unable to pull this end off once it set.

It's your call but it worked for me. I someone comes up with a part number I would eventually like to get the correct part.

Anyone else have any experience with this type of modification?

Jim

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RE: WALKERA 37 - 7/8/2006 11:40 PM

Heliwannabe

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FYI I finally roached the stock motor using the lipo battery. Fortunately I was just below hover power on the ground, it surged a couple of times and started running super rough. I opened the motor and one of the coils was burnt up. The outrunner is supposed to be here Monday.

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RE: WALKERA 37 - 7/9/2006 12:12 AM

armycopter

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I'm down until my hitec servo's get here. I robbed two of them from my 37 to put into my 4. My four is up and going but it's definitely not the same

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RE: WALKERA 37 - 7/9/2006 12:28 AM

soneebee

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hey guys since we share the same head as the DF60 wont the new CNC head fit teh DF37? it is already out and most of the guys on the 60 thread got the upgrade kit.. wont it work for the 37? it will be a very good upgrade if everthing works out right...

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RE: WALKERA 37 - 7/9/2006 12:52 AM

armycopter

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That would be great. I definitely want to upgrade to a CNC head! Soneebee, I thought you had picked one up for your 60?

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RE: WALKERA 37 - 7/9/2006 12:17 PM

soneebee

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I was planning to get one of the new heads that they came out for the DF60B.. but i was a little hesitant.. I haven't seen that kind of mixing yet.. but studying the pictures posted on the new it seems to be promising.. its almost the same as the bell hiller setup only difference walkera did was the positioning.. it seems that they packed it all in the center and just left out some links for the flybar... hmm that good since it will lessen the amount of vibration on the head... I have heard that alot of guys on the thread already purchased one.. and just waiting for the arrival of the new parts... i wa informed that the CNC tail assembly also came out.. but havent seen the pictures yet... this will also fit the DF37...

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RE: WALKERA 37 - 7/9/2006 2:03 PM

armycopter

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It seems strange that Walkera wouldn't market it towards the 37 as well. If you look at the description, it states that it will fit the #59 and #60, but makes no mention of the 37. I was told by RCANDME.com that a head would be available for the 37 this month, so I'm waiting to see if walkera comes out with a head designed specifically for the 37. If you know of someone who has a 60 head and has fitted it to a 37 let me know. Also, how do you get parts for it? Suppose you break something, do you have to buy the whole head or can you get specific pieces?

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RE: WALKERA 37 - 7/9/2006 2:41 PM

soneebee

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I havent seen the actual head of the DF37. but it seems to be similar in design with the DF60 unless the shaft diameter is different. That is a good point.. since this is a whole CNC head what about the replacement parts.. have to course that thru walkera

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RE: WALKERA 37 - 7/9/2006 8:08 PM

MikeU

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My new parts are not here yet but I am still plating with the stock setup. The problem I have now is the heli turn counter-clockwise and I have been unable to adjust even at 12"-18" up in the air. Any suggestions? The heli can not take too many more drops from that height without something breaking or it running into something. I am flying in the garage and so far have not hit anything.

Mike

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RE: WALKERA 37 - 7/9/2006 9:03 PM

armycopter

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Mike, a few pages back I mentioned turning dipswitch 12 on , turning the v1 and v2 knobs all the way counterclockwise and then turning the switch back off. That's what fixed it for me. The other day, I was reading the 60 thread and on page 49, I found this:

John,

To turn off rev mix akd rudder mix you can flip the #12 - then turn the V1 knob all the way counter clock vise - flip the #12 switch back to off. This should set your rudder mix to 0.

Br

Heine

It occurred to me that I had turned off the rev mixing inadvertently (but correctly). You should definitely give it a try. Let the Gyro do the work instead of the transmitter... This is not something that I know for a fact is causing the problem, it's just what I've seen and it appears that others are doing the same...

Good luck!

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RE: WALKERA 37 - 7/10/2006 5:52 AM

MikeU

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Mark,

I adjusted V1/V2 as you stated and wow, a lot more stable.

Now I just need to adjust the heli from going to the left or foward. I was able to get it off the ground about 6 inches but not at a stable hover. This is a good start. Still no crashes. I had about 5 minutes to play with it before the battery died. When I can get it to a stable hover about 2 feet, then I might venture outside. Upgrades need to come first.

I did have the heli start the yaw thing again only to find a screw had fallen off and I had no rudder control. opps.

Found the screw and back to normal.

Thanks,
Mike

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RE: WALKERA 37 - 7/11/2006 2:57 AM

Heliwannabe

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I battled the same thing and took armys advice and it is rock solid now except I have to leave the gyro in the Norm mode. When I go to AVCS it still wants to creep clockwise "viewed from the top". I am still waiting for the outrunner brushless so I can tweak on it. It's so smooth and stable now but the stock motor finally went to motor heaven. That lipo is nothing short of incredible.
Jim

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RE: WALKERA 37 - 7/11/2006 12:02 PM

armycopter

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I got my hitec HS-55 servo's last night. They install perfect. The fit is 100% for all four servo's. I haven't finished cleaning up the wires or adjusting the linkages so I don't know how they perform but I was relieved that they fit into the servo slots without any cutting or modifications.

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RE: WALKERA 37 - 7/12/2006 6:57 PM

W37 Cepeda

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quote:

ORIGINAL: armycopter

I got my hitec HS-55 servo's last night. They install perfect. The fit is 100% for all four servo's. I haven't finished cleaning up the wires or adjusting the linkages so I don't know how they perform but I was relieved that they fit into the servo slots without any cutting or modifications.

I have the same problem. 2 servos grinded.

I was looking for an immediatle replacement.

Please confirm for me.. the Hitec HS-55 servos work
with the reciever unit on the Df37?

Thanks

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RE: WALKERA 37 - 7/13/2006 12:13 AM

armycopter

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W37 - Yes the hitec servo's work perfect. I had to reverse a bunch of dipswitch settings because they ran in reverse from what the Walkera ones did but other than that it's a perfect match.

After my crash, everything is now back together and functioning properly but now I have a slight tail wag.

. I really hope it's not the main shaft but that is all I can think of. I have a spare but I don't want to take it all apart again. Any idea on what could cause a medium left to right tail wag?

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All Forums >> RC Helicopters >> Electric RC Helis >> Walkera Helis - Dragonfly, etc.. >> RE: WALKERA 37
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