RE: Brushless tail motor......  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       



All Forums >> RC Helicopters >> Electric RC Helis >> E-Flite Helicopters >> RE: Brushless tail motor......
Page: <<   < prev  1 [2]

Login
Message << Older Topic   Newer Topic >>
RE: Brushless tail motor...... - 8/19/2007 10:04:26 PM   
DriveWRX



Posts: 150
Joined: 11/16/2006
From: Palos Heights, IL, USA
Status: offline
quote:

ORIGINAL: cltmte

Got it all wired up and back together. Now when I run it I get serious pulsing in the tail motor (wag) that continues getting worse as it goes. No gain setting in HH mode allows even moderate control over the tail. It is as if it is constantly over correcting in both direction. In non hh mode I can fly controllably but the motor runs constantly and I have the trim all the way left. It still provides less control than the old dual tail set up.

Hope I didn't waste more money chasing the tail. Any ideas on what might be wrong with the tail? Using the g90 gyro, medusa 12 mm tail motor, and e-flite 10am esc.



Interesting...
Mine is doing exactly the same thing. But that's after a crash.
I landed a little hard in the lawn. Tail rotor chopped up some grass. Didn't think much of it, put the heli back on the driveway and took off again. Well, after a minute the tail rotor popped off. Needless to say, I crashed. Into the deck stairs, no less. The "lawn mowing" incident must have loosened the prop... I should have checked.

I bent the main shaft and ruined the main blades. Everything else looked fine.

I didn't have a replacement main shaft, so I tried straightening it. I put everything back together and went for a test flight. I got a serious tail wag like you experienced. I guess didn't do such a good job straightening the shaft because there was a pretty good vibration. I blamed the wag on the vibration. I figured it was shaking the gyro, which was just trying to doing it's job and compensate for the unwanted movement.

I'm currently waiting for replacement main shafts, so I can't do anything until they get here.

My advice, check to see if you have any kind of vibration going on.
My CP2 was flying decently before the crash. So, I know it works.
Here's more proof, check out this Full Brushless Axe CP.

Keep us posted.
I'll update mine after the parts arrive...

(in reply to cltmte)
       Post #: 26

RE: Brushless tail motor...... - 8/19/2007 10:29:20 PM   
cltmte


 

Posts: 240
Joined: 12/14/2005
From: Charlotte, NC, USA
Status: offline 		I have seen some of the videos which is why I went this way. I did have a serious crash with the dd gws motor. Found out the heli gives just a little more than asphalt in head to head competition. Bent the shaft, cracked the hub, etc. been getting it back together over the last week. Not much vibration left. One thing I did do was re-adjust the gyro again and set it around 65-70% on the pot. Plug in the heli and wait until everything armed - except the tail esc. Waiting for the gyro to arm. Then I pushed full left stick for about 5 secs to arm the esc. Wag is much more under control but still there to a degree. Only problem is with the gain at this setting once I land, the tail motor starts running and starts increasing speed until I get the battery unplugged. Wouldn't want to land too far away. Hard to hold left rudder and unplug the battery.

Take my T-Rex out and man what a difference. Tail is dead locked in through hard acceleration and decel. as well as quick jabs at the rudder control. It is just a bit big for the yard. Love the CP Pro for the yard when it is stable.

I'll keep playing with it and looking here and posting with any changes.

BTW Drive - refering to your drawing, does it matter whether the battery lines are removed from the main esc vs. the tail esc. I have the full bec connected from the tail and removed from the main esc.

(in reply to DriveWRX)
       Post #: 27

RE: Brushless tail motor...... - 8/19/2007 10:44:52 PM   
DriveWRX



Posts: 150
Joined: 11/16/2006
From: Palos Heights, IL, USA
Status: offline
quote:

ORIGINAL: cltmte
Only problem is with the gain at this setting once I land, the tail motor starts running and starts increasing speed until I get the battery unplugged. Wouldn't want to land too far away. Hard to hold left rudder and unplug the battery.


Sounds like my CP2.


quote:

ORIGINAL: cltmte
BTW Drive - refering to your drawing, does it matter whether the battery lines are removed from the main esc vs. the tail esc. I have the full bec connected from the tail and removed from the main esc.


I don't think it matters. As long as all the components are getting power form somewhere, it should be fine. I'm no expert though... that's the way I learned how.

(in reply to cltmte)
       Post #: 28

RE: Brushless tail motor...... - 8/23/2007 11:55:37 PM   
DriveWRX



Posts: 150
Joined: 11/16/2006
From: Palos Heights, IL, USA
Status: offline 		Update....

Got the new parts installed. Even with a new main shaft, there was still vibration. Rebalanced the main blades, tail rotor, head. Still a little vibe. Although it looked fine, I replaced the feathering shaft.... no more vibes! I am still having trouble getting the stock ESky woodies to track perfectly. I'll have to try different blades. (Anyone with any recommendations?)

Now that the heli is vibration free, it flies pretty good, even with the tracking problem. No more crazy tail wag. However, I do get temperature drift with the G90. I just trim it out while flying.

With this setup on my CP2, I can do FFF with nice banked turns & steady hovers. It's just a blast to fly! Just not ready for 3D yet...

So, IMHO, the full brushless system will work. As with any heli, setup is the key.

(in reply to DriveWRX)
       Post #: 29

RE: Brushless tail motor...... - 8/24/2007 4:02:45 AM   
cltmte


 

Posts: 240
Joined: 12/14/2005
From: Charlotte, NC, USA
Status: offline 		Glad you got it working. I could not get mine to settle. It was like it would over compensate, then under compensate, then over, then under with no way to bring down the power to a controllable level. I will probably give it one more try, then I either go back to the dual tail or make the final leap to the freestyle belt drive.

(in reply to DriveWRX)
       Post #: 30

RE: Brushless tail motor...... - 8/24/2007 4:19:03 AM   
crashcrash


 

Posts: 4003
Joined: 11/23/2006
From: St Louis, MI, USA
Status: offline 		Update on the blackhawk project. My theory on the lift is confirmed. Proper gauge wire to the main motor and proper connectors along with proper main blades...I overcome lift problem. A 15 or 20C 1800-2200mah battery wouldn't hurt a bit. The tail motor (NC12)...don't fare so well. It cant hold the tail at all and I figured it was a power problem thru the 3-1. I snagged a brushed ESC for the NC12 and hooked it all up thru the gyro etc. I promptly smoked 2 NC12's...way to much current getting thru the ESC for that little motor to handle. The reason I used a brushed ESC was to test the brushless theory thru the rate gyro. What I did end up with was when power was applied....the tail motor started instantly. The only way to vary the speed was to move the rudder stick. Applying power through the throttle had no affect on the tail motor so I assume I wired wrong. I'll check the schematics from earlier and see where I missed the boat. Better to smoke a NC12 than a brushless gig I figure. I might not get this monster airborne till snow flies at this rate (LOL).

_____________________________

what?

(in reply to cltmte)
       Post #: 31

RE: Brushless tail motor...... - 8/24/2007 9:11:52 PM   
cltmte


 

Posts: 240
Joined: 12/14/2005
From: Charlotte, NC, USA
Status: offline 		Before I ditch the brushless tail setup, would a different esc reduce the excessive pulsing? Right now I am using the e-flite 10a. Is there a lot of difference between esc manufacturers?

(in reply to crashcrash)
       Post #: 32

RE: Brushless tail motor...... - 8/24/2007 11:55:35 PM   
DriveWRX



Posts: 150
Joined: 11/16/2006
From: Palos Heights, IL, USA
Status: offline 		cltmte,

Yes, I believe there is a difference in ESCs.
I have a CC Phoenix 10 on the main and CC Thunderbird 9 on the tail.
Even though there's only a 1A difference, the Phx10 is 2.5 times the cost of the TB9. For a good reason. The electronics are much better, more programing options offering much better fine tuning.

Here's a post in the "Axe CP Full Brushless Conversion" thread.
http://www.rcuniverse.com/forum/fb.asp?m=6055839

Here's his original tail components:
Tail motor: AMMO 12-30-4110 from Tower Hobbies
Tail ESC: H-Wing Pentium 6A /.8bec/6g Speed Controller (HW-6A) from U.H.
He was having tail problems, ESC not talking to the gyro and vice versa and tail control not to his liking, he went back to brushed DD. Then after hearing about others success, tried the Phoenix 10 on the tail. SUCCESS! Here's the Full Thread.

Apparently, the Phoenix 10 is a good ESC!
I'm highly considering getting a second Phoenix 10 for the tail on my CP2. The Thunderbird 9 is working OK for now though.

-Vince

(in reply to cltmte)
       Post #: 33

RE: Brushless tail motor...... - 8/27/2007 3:02:04 AM   
cltmte


 

Posts: 240
Joined: 12/14/2005
From: Charlotte, NC, USA
Status: offline 		Update:

Tried the phoenix 10a esc - no difference, still severe wag. took the 401 off my T-Rex to try and still no better, same serious wag slightly adjustable with gain. Nearly tore it apart testing it. Will go back to the dual tail and fly till I decide whether or not to try the belt drive.

(in reply to DriveWRX)
       Post #: 34

RE: Brushless tail motor...... - 8/27/2007 3:22:43 AM   
DriveWRX



Posts: 150
Joined: 11/16/2006
From: Palos Heights, IL, USA
Status: offline 		Dang... Sorry it didn't work out for you.
Well, you tried. I say set it up so you can fly it and enjoy it. That's the important part, enjoy the hobby!

Good Luck & Happy Flying!
-Vince

(in reply to cltmte)
       Post #: 35

Page:   <<   < prev  1 [2]
All Forums >> RC Helicopters >> Electric RC Helis >> E-Flite Helicopters >> RE: Brushless tail motor......
Page: <<   < prev  1 [2]





Jump to:


Google