RE: RE: OK, these motors just don't last - now what  
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All Forums >> RC Helicopters >> Electric RC Helis >> RE: RE: OK, these motors just don't last - now what
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RE: RE: OK, these motors just don't last - now what - 2/24/2004 3:07:40 AM   
lawnhawk



Posts: 198
Joined: 11/28/2003
From: McHenry, IL, USA
Status: offline 		jerbo6iks,
Put a drop of some 3 in 1 earl on those brass bushings. Let the lube set for a second and dab the excess with paper towel.

These motors constantly need oil on the bushings, which is what is squealing.

(in reply to jerbo6iks)
       Post #: 51

RE: RE: OK, these motors just don't last - now what - 2/24/2004 4:24:20 AM   
jerbo6iks


 

Posts: 49
Joined: 12/28/2003
From: Richmond, VA, USA
Status: offline 		I have this nice little bottle of 108 light gear oil with a 3 inch syringe applicator. It works great for putting a small amount of oil in tight spots. I had oiled up the bearings in the beginning but I guess it just dried out. I put the same motor back together, did some better soldering and lightly lubed it and it FLIES GREAT. I was able to put the heat sink on it tilted off at 45 degrees so that should help a little also. It now has 1 hour 10 minutes on it. Plenty of power and good acceleration, no loss of light time.

Unless you are a person who is adverse to a little soldering and tinkering, this is a great way to go. I think it makes for more fun an a real understanding for how things work. By the way, a 3 inch C clamp works great for pressing the pinion gear onto the shaft.


My thanks to the guy who originally put me onto that All Electronics site. I'm sold. Will probably give some of those direct drive sized tail motors a shot sometime soon.

(in reply to lawnhawk)
       Post #: 52

RE: RE: OK, these motors just don't last - now what - 2/24/2004 6:04:42 AM   
mcdoong


 

Posts: 18
Joined: 1/1/2004
From: Alhambra, CA, USA
Status: offline 		I'm not pretty sure how my mixer board are burned. But here is my guess: The gap between the magnets and rotor is very small. If a larger filing fall between, it may cause the rotor stuck. A lot of current would flow directly in this case. Or if some of them getting close to brush area may cause some problem? There is no provement, just my imagination.

mcdoong

(in reply to jerbo6iks)
       Post #: 53

RE: RE: OK, these motors just don't last - now what - 2/24/2004 12:32:20 PM   
lawnhawk



Posts: 198
Joined: 11/28/2003
From: McHenry, IL, USA
Status: offline 		I have my $.50 motors sitting here, soldered up ready to go (waiting for pinion gears )

Some things I have already learned in tinkering while waiting:

The mounting screws you use have to be very short or they will strike the armature. I think the screws I ended up using had a thread length of only 4-5mm. The stock screws are too long!

The RPM of the Johnson motor vs. the 370, when same voltage is applied, is considerably higher under no load. I am certain a 9 or even 8-tooth pinion could be substituted for the 10-tooth when using this motor.

Avoid the drill, and tap the motor mounts with tapping screws, seems to drastically reduce the metal shavings that enter the motor.

The motors were shipped with dry bushings. If I had installed and flew this motor without bench-testing, I would have been waiting for a crash kit because it hesitated so badly. Also, the current draw when the motor is squealing like that is enough to cook the average speed control (my ammeter has a 10 amp range and it spiked it a few times). I can't emphasize enough how fast the bushings dry out on these.

I hope someone can use this information, I hate when tinkering goes to waste

(in reply to mcdoong)
       Post #: 54

RE: RE: OK, these motors just don't last - now what - 2/28/2004 7:41:52 PM   
lawnhawk



Posts: 198
Joined: 11/28/2003
From: McHenry, IL, USA
Status: offline 		Ok, I have just flown the 11th birdseed through my Hummingbird using the $.50 motor and no heat sink. I am quite pleased with the overall value I must say. If this motor died right now I would be satisfied.

My speed control and motor are both doing well, though the heat buildup on the motor during a flight is pretty intense. The board is still snugly wrapped in its factory blanket, but even so it only gets moderately warm.

One thing I did do, as I mentioned in previous posts, was to keep after the motor bushings. Twice during these 11 packs I put a tiny drop of 3 in 1 oil on each end. If the motor shaft hesitates on a dry bushing, the chopper will drop like a rock, and the current draw could smoke your board.

I have done this with a 10 tooth pinion, I am looking around now for the smallest pinion I can find that will fit the 2mm shaft. I am certain this motor has the RPM for it, so a small pinion should reduce the heat a little and maybe even add a minute to flight time.

Would sure like to hear from you other guys who ordered batches of these.

(in reply to lawnhawk)
       Post #: 55

RE: RE: OK, these motors just don't last - now what - 2/29/2004 4:05:56 AM   
Coasty



Posts: 145
Joined: 10/21/2002
From: Sault Ste Marie, MI, USA
Status: offline 		Two questions. I'm new at the so forgive the ignorance...

1)
I'm not up on how the parts from various manufacturers interchange with one another.
I've got a Hummingbird ordered and on the way. Will the motors work for me w/o any major refits?

2)
I've read some posts here and under other topics where control boards were burnt when motors shorted or in some other way failed. Seems that somehow the motor drew more current than the board could supply. Has anyone though of putting a small fuse in line with the motors to prevent this?

Thanks

(in reply to lawnhawk)
       Post #: 56

RE: RE: OK, these motors just don't last - now what - 2/29/2004 4:09:55 AM   
Super-Hornet


 

Posts: 565
Joined: 1/13/2004
From: Earth, SINGAPORE
Status: offline 		Hi Coasty

Great idea about the fuse. Before u put in the fuse, u need to know how much current it take first. I would suggest maybe use those slow blow fuse or resetable fuse.

Super-Hornet

< Message edited by Super-Hornet -- 2/29/2004 12:10:25 PM >

(in reply to Coasty)
       Post #: 57

RE: RE: OK, these motors just don't last - now what - 3/1/2004 2:17:07 AM   
Coasty



Posts: 145
Joined: 10/21/2002
From: Sault Ste Marie, MI, USA
Status: offline
quote:

My thanks to the guy who originally put me onto that All Electronics site. I'm sold. Will probably give some of those direct drive sized tail motors a shot sometime soon.


What's the difference between "direct drive" and the standard tail setup?

(in reply to Super-Hornet)
       Post #: 58

RE: OK, these motors just don't last - now what - 3/15/2004 1:52:02 PM   
raabid


 

Posts: 182
Joined: 1/10/2003
From: Raleigh, NC, USA
Status: offline 		These little replacement motors are great! Now which replacement tail motor should I go with?

(in reply to jerbo6iks)
       Post #: 59

RE: OK, these motors just don't last - now what - 3/15/2004 6:31:54 PM   
darkside212


 

Posts: 256
Joined: 5/15/2003
From: Milwaukee, WI, USA
Status: offline 		"What's the difference between "direct drive" and the standard tail setup? "

The standard tail setup has a gear. Basically so you can use a smaller motor to power the bigger tail rotor. The direct drive setup uses a bigger motor that is directly connected to the rotor blade. The only down sides to the direct drive setup are:
the are a little heavy---some people have had problems adjusting the center of gravity.
the larger motor does draw more amps which may lead to a shorter flight time.
Some people have had difficulty adjusting their revo mix (If not using the hummingboard), but with a little patience you can get it dialed in perfect, or use a heading hold gyro.


The up sides are:
The setup is cheap should be right around $8-$10
the rotor blades are cheap, and the motor comes with two.
It'll give you a lot more tail authority----I mean a lot...Mine will spin faster clockwise than counter clockwise!
The motor will last a lot longer than the stock one. I have many hours on both of my birds and have yet to change the DD motors on them.

(in reply to raabid)
       Post #: 60

RE: OK, these motors just don't last - now what - 3/26/2004 12:19:14 PM   
SMaric


 

Posts: 88
Joined: 3/19/2004
From: BroadstoneDorset, UNITED KINGDOM
Status: offline 		Does anyone have the Johnson part Number (for the allEclectronics CAT# DCM-189 & CAT# DCM-166)

I have been searching the http://www.johnsonelectric.com site but can't find motors which match the allElectronics specs


I am trying to source these in the UK

Thanks

(in reply to jerbo6iks)
       Post #: 61

RE: OK, these motors just don't last - now what - 3/26/2004 4:13:56 PM   
darkside212


 

Posts: 256
Joined: 5/15/2003
From: Milwaukee, WI, USA
Status: offline 		They're under motors.

http://www.allelectronics.com/cgi-bin/category.cgi?category=400&item=DCM-189&type=store

(in reply to SMaric)
       Post #: 62

RE: OK, these motors just don't last - now what - 3/26/2004 7:03:44 PM   
SMaric


 

Posts: 88
Joined: 3/19/2004
From: BroadstoneDorset, UNITED KINGDOM
Status: offline 		I've seen the AllElectronics site - Thanks
(have just ordered some)

What I was actually after was the johnsonelectric.com part numbers


I have found a Johnson contact in the UK & am trying to siurce them locally
But I can't match any of the Johnson (website) motors to the descriptions on the allElectronics website

(in reply to darkside212)
       Post #: 63

RE: OK, these motors just don't last - now what - 3/26/2004 7:10:12 PM   
darkside212


 

Posts: 256
Joined: 5/15/2003
From: Milwaukee, WI, USA
Status: offline 		oops sorry

(in reply to SMaric)
       Post #: 64

RE: OK, these motors just don't last - now what - 3/26/2004 10:05:33 PM   
crashparry


 

Posts: 103
Joined: 2/27/2004
From: South Coast, UNITED KINGDOM
Status: offline 		Hey SMaric... let me know about those motors. I am just down the road from you (in southbourne)!

(in reply to SMaric)