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Midland Helicopters . HeliProz . Ron’s HeliProz South

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Century Hawk - 50NX - Raven - Predator > Raven 50. Brokken tail gear.
 
 
J Kofoed
Senior Heliman
Location: Denmark

My Posts This: Topic  Forum		I dare not give quick and sharp steering with my tail rotor!
I am afraid to break some teeth in the tail gear unit, I have tried for a time too much!
What is your experience?
Have you broken teeth in the air?
I use the tail blades: 95mm Align T-H60128-1.
I can probably also just use metal gears?

Best regards Jesper Kofoed
09-24-2009 07:19 AM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		what gyro? just have to program a stopping speed and you can bang away all you like.

Shawn
Team Leisure-Tech
Team HelixRC
09-24-2009 07:26 AM
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J Kofoed
Senior Heliman
Location: Denmark

My Posts This: Topic  Forum		Gyro is a JR770.

Best regards Jesper Kofoed
09-24-2009 07:47 AM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		blaaah, sorry, i have nothing good to say about JR gyro's.

I just took a look through the manual for the 770, and there does not seem to be a way to adjust the stopping speed, or to add in a delay like any other gyro, such as the 601 which has been around for some time.

i wonder if maybe adding some expo (around 30% ? ) will help soften the stop near the center of the stick. unless you have that already. from my experience, even slowing down the piro rate has helped prevent gear stripping. I did this using the travel adjust for the rudder, instead of 150%, i have it dialed down to about 125%. This still gives a fast piro (on the mini-g) but takes it easy on the tail gears.

i currently use the 601 on my Raven, but i had to tweak in the stopping speed a tad to prevent the crown gear from stripping. it isn't a lot, or even noticeable to the naked eye when you watch the heli come to a stop. just enough so it isn't too aggressive on the tail.

i use the Mini-G on the Predator, and i even had to dial in the stopping speed on that as well. Both machines had very strong tail systems. but gyro settings can test those limits.

Shawn
Team Leisure-Tech
Team HelixRC
09-24-2009 08:33 AM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		hmmm, never broke Tail Gears in the air, but then again I'm no CY on the tail, on the other hand I have done some awful awesome Spinning Climb-outs..

Jim
Buzz Buzz Buzz
09-25-2009 12:28 AM
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reddragon
Key Veteran
Location: Brooklyn, N.Y.

My Posts This: Topic  Forum		Why kill yourself? Just use the metal gears for the tail and call it a day.

Wayne -- Fly it like you stole it!
09-25-2009 01:49 AM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		well, something has to fail. and i have always had the crown gear fail before the tail gears myself back when i had the plastic tail gears.

i now use the metal tail gears. no real reason other then i can. haha.

Shawn
Team Leisure-Tech
Team HelixRC
09-25-2009 03:05 AM
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J Kofoed
Senior Heliman
Location: Denmark

My Posts This: Topic  Forum		I have never destroyed the crown gear.
And I does not replace the gyro, due to a weak tail gear.
So I chose probably metal tail gears.

Best regards Jesper Kofoed
09-25-2009 10:32 AM
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FBoss
Key Veteran
Location: Aurora Indiana USA

My Posts This: Topic  Forum		It seems to me the tail gears and/or crown gear stripping is a symptom not a cause. I have a 770 gyro on another bird and its a great gyro but takes some time to get tuned in just so, Id keep tweeking the gyro until the issue is resolved.

The crown gear is $9 US the tail gears $5, until I had found the problem Id rather replace the less expensive gear. For me its easier to replace the tail gear than the crown. If you go with the metal gear w/o curing the problem you may as well buy a few crown gears because you will be replacing them. Turn that gain and ATV down

The good ole times are now ,Hawk, Raven, Raven NX, Logo 10
09-25-2009 11:03 AM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		J Kofoed ,, what type of pilot are you,, I really don't think you will have a problem with the Tail Gears braking in flight, I mean I don't remember any complaints about them braking in flight,,

Crown Gear,,
other than in a crash the only time I stripped a Crown Gear is when I had a very hard landing while doing an Auto,,
if the Back-Lash in your Crown Gear/Tapered Gear is excessive you can use a Thin Washer to put behind the Tapered Gear, this will push the Tapered Gear forward tightening-up the Lash, then you shouldn't have a problem with stripping, even in a hard landing,,

anyway, and to add, Century has increased the Teeth Depth in the NX Crown Gear..

Jim
Buzz Buzz Buzz
09-25-2009 10:44 PM
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Century Hawk - 50NX - Raven - Predator > Raven 50. Brokken tail gear.
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