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12-12-2004 09:01 PM  13 years agoPost 1
westcoastchoper

rrApprentice

Denton, Tx

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Just purchased a Hawk III off ebay. New to heli's but not to rc. Flown plenty of planes. I have a gyro question. It came with a revolution single gain gyro. I have the hawk trimmed in and can go "hands off" for about 8 seconds. It stays perfectly still but after the 8 seconds, the tail will whip counter clockwise about 90 deg before i can catch it. The gain is at about 80% and the tail does not wag. I am just hovering, no forward flight yet. I have almost a gallon of fuel thru it, and it will do this every flight. It seems to make no difference wether it is 12" or 10' of altitude so i know its not just ground effect. The gyro is mounted behind the receiver and bat under the servo tray. Is this too close to the engine? Any help or suggestions would be great.

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12-12-2004 10:31 PM  13 years agoPost 2
SteveH

rrProfessor

Texas

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Your gyro mounting location is fine. Double check to prove the push rod on the tail rotor pitch control moves smoothly with no drag. You may even need to drill out the holes larger in the plastic guides on the tail boom. Additionally, use a long arm on the tail rotor pitch servo, and dial down the channel throw to prevnet binding and that will help the gyro hold better.

The government cannot give you anything without first taking it from someone else.

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12-13-2004 07:55 AM  13 years agoPost 3
jackheli

rrProfessor

Vancouver - Canada

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Also check that the bellcrank and slider are both moving smoothly.

Now the basics: Make sure both tail blades are mounted so that the leading edge will point forward when the main blades turn clockwise, and make sure you do not over tighten the tail blades to the point they can't pivot on the holders.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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12-13-2004 12:23 PM  13 years agoPost 4
westcoastchoper

rrApprentice

Denton, Tx

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Thanks guys. I am actually considering moving the rudder servo to the tail with century's carbon kit and maybe even the carbon pusher. Is the carbon boom any lighter than the stock one or is it just stronger? The hawk is already a little tail heavy. Also I was concerned that my problem might be the tail rotor drive shaft. I have heard they can wind up and accelerate the tail a little bit. Anyone had this happen? Thanks for the advice. Will try your suggestions, just need a calm day or two. 25mph winds for the next few days here. Pretty useless to try anything besides crashing!

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12-13-2004 02:57 PM  13 years agoPost 5
rstacy

rrElite Veteran

Rochester, NY

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Its a junk gyro.

I have had a few and that was a common failure.

I doubt that is mechanical as it wouldnt swing 90 and stop.

Check the gyro followed by the servo.

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12-13-2004 05:46 PM  13 years agoPost 6
jackheli

rrProfessor

Vancouver - Canada

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If you are learning how to fly don't even consider upgrading your Hawk to carbon parts. It is a waste of $$$.

The Hawk is awesome as a first heli as it comes, and you can upgrade it later when you are already into 3D. By then you will consider different upgrades, I am sure.

My advice is: learn as cheap as you can so you can use the money you saved when it matters.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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12-14-2004 12:14 AM  13 years agoPost 7
oldfart

rrProfessor

Vancouver, Canada

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I betcha rstacey is right. try a different gyro - even the inexpensive CN2022E would probably do better.

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12-14-2004 08:46 PM  13 years agoPost 8
westcoastchoper

rrApprentice

Denton, Tx

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Have any of you guys used a jr gyro. I am looking at a g500t. Everyone swears by the futaba, but I am prone to staying with one brand unless it just doesn't work. Everything else I have is jr. The gyro is the only thing I can see causing my problem.

Thanks for all your input.

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12-14-2004 09:06 PM  13 years agoPost 9
rstacy

rrElite Veteran

Rochester, NY

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OK. So we agree that it is your gyro.

The 500T is one of the easiest gyros to set up and one of the best at holding the tail. It is also the best gyro that JR has released but that really isnt saying much.

I would rank it
Above the 401
Equal to the CSM 560
Just a tiny hair below the 601


Disclaimer: Yes I paid for and have flown all of the gyros mentioned in this post

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12-15-2004 12:32 AM  13 years agoPost 10
westcoastchoper

rrApprentice

Denton, Tx

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Yeah, all the other stuff mentioned earlier, blade dir..no binding anywhere..etc, only leaves the gyro. Eventhough I am new to this realm of the sport, I am still interested in re-locating the tail servo to the boom. It just makes more sense to be there. I got the heli for half price and it had never been flown. It was obvious too. Had he tried, it would have been a dismal failure. Everything attached to the main shaft was put together wrong and the radio was setup in airplane mode. He wasn't the sharpest knife in the drawer. Because of the price I paid, it won't kill me to spend 20 bucks to make it fly better.

Thanks for the input.

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