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HelicopterBeginners Corner › Tail Wagging
06-01-2004 06:54 PM  13 years agoPost 1
polyhedron

rrApprentice

Amite, Louisiana, USA

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I have been flying with training gear for a while now. I stripped if off the other day just to see the difference between the gear and no gear.

Well, I guess the weight (or inertia) of the training gear was keeping my tail from wagging in the air . With the gear on, my tail was rock solid. Took it off and the tail would wag about 5 degrees while hovering (actually, it wasn't waggin like a dog's tail, it was kind of jumping +- 5 degrees, staying at each position for a half a second or so).

I have a JR8103 radio and GY401/9254, raptor 50

With the gear on, I had my gain at 72%, thus putting the gyro in heading hold. When I took the gear off, the tail wagged, so I adjusted the gain up to 76 and down to 68 just to test out to see if it got any better. I didn't notice any difference. The tail was still wagging.

What should I do?


--Matt

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06-01-2004 07:30 PM  13 years agoPost 2
archangel

rrApprentice

Pasadena, CA - USA

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Check for the easy stuff first:
Is everything tight?
No "slop" in the controls?
Are all the linkages moving freely?
Is the engine properly tuned?
Are the blades tracking properly?
Is there anything bent (mainshaft, feathering spindle, etc.)

Once you rule any mechanical issues out, then you have to get a bit more into details:

Are you allowing your gyro to acclimate to ambient temperature? You can't take a heli from an air conditioned car and go flying right away on a hot day. Give it some time to get used to the outside temp.

Are you using tail boom supports? If so, make sure they are tight. Use a clamp about halfway up the boom support tubes. If you don't have any support tubes, get some.

Try moving your gyro around. You may be able to find a better spot on the frame to minimize vibration.

If you are just removing your training gear, I am assuming that you are just begining your flying career. Be sure to go to your local field and ask an experienced pilot to look over your ship. Many times a quick inspection can reveal an obvious problem to experienced eyes.

I hope this helps!

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06-01-2004 10:38 PM  13 years agoPost 3
polyhedron

rrApprentice

Amite, Louisiana, USA

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Everything is tight
No slop in the controls
Linkages move freely

Engine ..... I am not exactly sure whether or not my engine is tuned just right. It could possibly be variances in the headspeed, but I can hold a solid hover at a specific altitude.

Blades are tracked
Nothing's bent. It's all brand new and I have looked this over also.

Acclimated to temperature. But I did have it in the car parked for a couple of hours this weekend, could this have ruined the gyro?

Support tubes are tight

I have the gyro installed right behind the head, this is the manufacturers recommendation and I have seen many other people with the same setup with no problem.

I'll be at the field this weekend probably, just wanted to try to get this problem solved this week.

--Matt


--Matt

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06-01-2004 10:51 PM  13 years agoPost 4
KGB

rrApprentice

Portsmouth, VA

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I'm experiencing the same kind of problem, but from my understanding and what I've been told by the nice local guys helping me it has to deal with the fact that I'm still running my engine pretty rich since I'm still breaking it in.

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06-01-2004 11:02 PM  13 years agoPost 5
archangel

rrApprentice

Pasadena, CA - USA

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Looks like you have done everything.

I still recommend that you get ahold of someone that could look your ship over. Two sets of eyes are better than one.

As far as the temp acclimation goes, you have not ruined your gyro, but with the new silicone based gyros, there are definite temperature issues that the instructions mention. They reccommend 10 to 20 minutes of temp acclimation before your begin flying for the day.

Make sure that you are running the right plug (OS #8 or Enya #3 are the current favorites, I believe) and that it is in good condition.

Play with your needle valve settings to see if they help the tail wag. I would try a couple of clicks richer at first. If you feel comfortable with FFF, give it full power for about ten seconds (trying to keep it in level flight going really fast). If the engine stays strong, you are rich enough. If the engine stays strong and there is a lot of smoke, you can lean it out a bit. If the engine slows down after a few seconds, and you don't have a lot of smoke, lower the Throttle IMEADIATELY to get it to a better setting and LAND Richen the mixtue by 5-6 "clicks" and try it again. If the engine slows down and there is a lot of smoke, lower the throttle ASAP and land to lean the mixture by 2 or 3 clicks and try again.

If all else fails, you need to lower your gain. Having high gain is not critical until you get into the more advanced aerobatics. All you need is enough gain to keep the nose straight. Drop it to 40%-45% if you need to just to get you flying until you find the source of your tail wag.

If after all of this you still feel the Gyro is not operating properly, send it back and have it checked.

Good Luck

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06-02-2004 04:46 AM  13 years agoPost 6
moorecj98

rrApprentice

na

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check your belt to make sure its tight

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06-02-2004 05:02 AM  13 years agoPost 7
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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polyhedron

It's probably the motor slightly rich. If the motor is broken in, lean the high needle valve a click or two.

Your gyro set in the 70s has a high enough gain. Every time my helis did what you are describing (and the gain didn't stop it), it was the motor running rich.

Best Regards, Dario

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06-02-2004 05:10 AM  13 years agoPost 8
polyhedron

rrApprentice

Amite, Louisiana, USA

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I may be running rich... see my gallery to see all the smoke. The pictures without the training gear were taken Monday.

I guess running rich will cause the headspeed to be unstable due to the fluctuating engine power. Also, with fluctuating headspeed, there's also fluctuating tail rotor speed, and I guess that this disables the ability for the gyro to hold heading just by varying the pitch of the tail rotor blades.

I'll lean it up tomorrow and we'll see.


--Matt

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06-02-2004 04:28 PM  13 years agoPost 9
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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polyhedron

One click at a time....you may need several clicks, but one at a time. A temp guage is the easiest way to do this, but eventually you will learn from the sound, responsivenesss and smoke from the motor. Your analysis of what happens when rich is correct.

It's hard to tell from the pics in the gallery..but there is a lot of smoke in one of the pics.

Best Regards, Dario

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06-03-2004 04:28 AM  13 years agoPost 10
allns47

rrKey Veteran

Richmond IN.

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Do you have the switch on the gyro set for digital servos...I run my gyro at 100% in hh with no problems...

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06-03-2004 04:37 AM  13 years agoPost 11
polyhedron

rrApprentice

Amite, Louisiana, USA

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Leaned the low needle up a bit and now the tail's rock solid again at a hover.


--Matt

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06-03-2004 04:47 AM  13 years agoPost 12
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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polyhedron

Glad to hear that. It's usually something simple.

Best Regards, Dario

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06-03-2004 01:43 PM  13 years agoPost 13
BarracudaHockey

rrMaster

Jacksonville FL

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allns47

If your running your gyro at 100 percent gain and not getting tail wagging, you need to move your tail rotor pitch linkage out one hole and try again, your not getting the most out of your gyro. Somewhere in the 70 percent range for HH is right.

Andy

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