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JR-Spektrum . Gyro Hobbies . E-flite

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e-Align T-REX 250-450-500-600 > Need Help with Tail Wagging with 401 and Hitec 81 servo
 
 
Rcbry
Senior Heliman
Location: USA

Hey, I've got a wag in my tail in headlock mode. I'm down to 11% rate and still have a moderate wag. Has anyone else experienced this or have any suggestions?
12-14-2004 Over year old.
 
 
Shun
Senior Heliman
Location: Houston, Tx

What blades are u running on the head?
If Plastic try the woodies, check the belt as it slides the boom in!
Check the o ring dampners in the head on the correct end! Make sure the gyro is in Non-digital setting unles u are using a digital on the tail!
12-14-2004 Over year old.
 
 
tele3030
Senior Heliman
Location: Singapore

turn your 401 to normal mode ..( not HH mode ) then adjust your tail links so that you can hover the heli about 2ft of the deck and the tail is holding. ie make sure that your links are neutral befoer you start.

then switch to HH mode and see how she is that should fix your problem
12-14-2004 Over year old.
 
 
pilotError
Key Veteran
Location: Long Island, NY

Linkages

A couple of things to look at:

Pull the linkage off the servo and push the tail pushrod back and forth, you should have smooth movement back and forth (no binding, no hanging up in spots). If you don't, use some oil and adjust the setup so that it is smooth.

Make sure the 401 is not in DS mode (Digital Servo).

Make sure the 401 cables are plugged in correctly and you can remotely adjust the Gyro correctly (Try switching from heading hold to normal and see if the light goes out on the 401. If it is blinking, your having a problem). If your using a hitec or other micro receiver, you may have the signal on the ground wire (if I remember correctly) and it doesn't really do much when you change the ATV's (or gyro menu).

Make sure you turn the power on with the 401 in Heading Hold mode.

For best performance, take the tail rod off the servo, set the travel on the Gyro to 140% and move the tail rod further in on the servo horn until you can go stop to stop without binding. If your below say 80%, your too low and need to go in a hole on the horn. This will cause hunting.

Remember to turn off Revo mixing (Thr -> Rud or Pit -> Rud).

You can run in Normal mode with this gyro, but it's really better in Heading hold mode. A number of micro experts always suggest putting it in Normal mode and setting up that way. I find the Stop to Stop method pretty fool proof, but hey whatever works for you.

The HS81 should be fast enough (.11 - 4.8V, .09 - 6V) but you can try playing with the delay on the gyro.

Do you have an external BEC? If not, you might want to consider getting one (Medusa USA sells a 5.1V and a 6V - if your components can handle 6V, you'll notice a difference, it's one of the less expensive one's around too). The CC25 and other ESC's in that class don't handle 4 servo's / Gyro on the internal BEC. You might be able to get away with it, you might not. If all else fails, you might want to look into this option.

Good Luck,

Mike...

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.
12-14-2004 Over year old.
 
 
Rcbry
Senior Heliman
Location: USA

I think I found the problem I'll let you guys know after a test flight tomorrow. I had tightened the belt up once so I didn't check it again but it was really loose. I retightned it and then drilled a setscrew into the boom from the bottom so it didn't rub the belt. Hopefully this is all it was but time will tell.

thanks to all for the advice.
12-15-2004 Over year old.
 
 
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e-Align T-REX 250-450-500-600 > Need Help with Tail Wagging with 401 and Hitec 81 servo
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