Collective Change = Tail Wag - HeliFreak
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Old 09-25-2009, 03:08 PM   #1 (permalink)
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Default Collective Change = Tail Wag

Another peculiar situation. I have a B400 with JR DS287s on cyclic and a DS287MG on the tail. Currently, the bird has the original G110 gyro installed.

When I add collective in normal mode, I get a severe tail wag to the right. When I reduce collective in normal mode, I get a severe tail wag to the left. In Idle-Up, I get no tail wag. I have replaced the G110 with another G110. No change. I even put the original E-Flite servo back on the tail. No change. The tail holds pretty well in normal mode if I don't increase or decrease the collective.

At one time I had a Futaba GY401 gyro on the heli. Although it worked pretty well, it caused my stock ESC to burn up. I don't have a BEC on the heli. I removed the 401 and put it on a recently acquired T-Rex 450 SE V2 and the gyro works fairly well. I replaced the B400 ESC with another stock E-Flite ESC and put one of the G110s back on. I think the severe tail way started happening sometime after that. Not sure when.

My question: Could the tail wag be due to a faulty E-Flite ESC?

Thanks in advance for your assistance.

Jerry
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Old 09-25-2009, 04:38 PM   #2 (permalink)
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In Normal mode your headspeed is changing more than it does in Idle up, that's why your tail is kicking out. Wag is when the tail continuosly oscillates back and forth.

If you change you Normal mode curve to more closely match the Idle-up curve you won't have the severe headspeed changes that often cause some gyro's problems.

Also, the G110 is not a very good gyro and the DS285 is not a good tail servo.

Try a Normal curve of 0-60-80-90-100 and an Idle-up curve of at least 100-90-80-90-100.

Or, just fly in Idle-up since it works OK for you.

FWIW, I just use Normal for spool up only, then switch to Idle up for flying.
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Blade 400: E-flite 420H/35X ESC, AR6100e, HS65HB x 3, G401B/DS290G. (Ret.)
CopterX 450AE V2: 430XL/35X ESC, AR6100, HS65HB x 3, LTG2100T/HSG-5084MG.
T-Rex 550E V1 Classic Flybar: 600MX/BL70G, AR6200, DS610 x 3, Quark/DS650, 16t/520mm blades.
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Old 09-25-2009, 04:55 PM   #3 (permalink)
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Quote:
Originally Posted by Wolfpackin View Post
Also, the G110 is not a very good gyro and the DS285 is not a good tail servo.
He's using the 287, not the 285 for tail. It should be good for the tail.

Torque:13 oz/in @ 4.8V; 16 oz/in @ 6V
Speed:.08 sec/60 @ 4.8V; .07 sec/60 @ 6V
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Old 09-25-2009, 05:30 PM   #4 (permalink)
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Still, not a great tail servo.

...And the rest of my post still applies.
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Jonathan Livingston Helicopter
Blade 400: E-flite 420H/35X ESC, AR6100e, HS65HB x 3, G401B/DS290G. (Ret.)
CopterX 450AE V2: 430XL/35X ESC, AR6100, HS65HB x 3, LTG2100T/HSG-5084MG.
T-Rex 550E V1 Classic Flybar: 600MX/BL70G, AR6200, DS610 x 3, Quark/DS650, 16t/520mm blades.
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Old 09-25-2009, 05:31 PM   #5 (permalink)
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head speed FTW
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Old 09-25-2009, 06:48 PM   #6 (permalink)
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Appreciate your comments. I'll change the curve and see if that makes any difference. Also, I'll just use Normal for Spoolup, then switch to Idle-up .

Thanks again, Jerry
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Old 09-25-2009, 07:42 PM   #7 (permalink)
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don't even have to do that.
as long as the throttle is 0 for 15 seconds the soft start will take care of it.
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