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Century Hawk - 50NX - Raven - Predator > Near Mishap with Hawk Pro
 
 
HawkProPilot
Senior Heliman
Location: Iwakuni, Japan

My Posts This: Topic  Forum		I am not sure if this is old news or not, so I decided I would share it anyway. Hopefully it will help out someone else with a Hawk before it happenes to them.

I started out pretty good for the day, did a little hovering and then a little forward flight. I wanted to see what the piro rate looked like with my new gyro, so I took my heli up to about 15 feet and gave full left and right. I was about out of fuel so I landed and refueled. When I tried to take off again, my heli went into a violent piro to the left. I hit T-hold and brought it back to the ground from the few inches it managed to climb. I gave right stick to try to counter and made it light on its skids and still got left Piro on the ground so I shut down.

The cause??? The tail control rod guide that is all the way to the rear slide backward far enough that it locked the tail rotor pitch to one position. To fix this until I can get a better tail control system in place I put plastic zip ties on the tail boom on either side of the guides. If yours are loose at all, dont not fly until you find a way to keep them in place. I got luck that my incident happend on the ground. Hopefully it wont happen again!
04-19-2009 05:16 AM
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canbarelyhover
Veteran
Location: Sunnyvale, CA

My Posts This: Topic  Forum		happened to this guy as well but wasn't as lucky as you...



manual says to use CA glue to prevent shifting/binding.

-James
got nitro?
04-19-2009 05:24 AM
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Mutt
Key Veteran
Location: M ca usa

My Posts This: Topic  Forum		If you would of read your manual you would of saw it said to ca glue the guides after getting them into the proper position. If you would of read the maunal you wouldnt be here today telling others of a "problem" that dont exist if you do what is said in the manual and is just commen sense to secure the guides.
04-19-2009 02:24 PM
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canbarelyhover
Veteran
Location: Sunnyvale, CA

My Posts This: Topic  Forum		all you need are a couple "dots". it's enough to securely lock it in place but you can still take the guides off the boom if you need to with a firm twist.

-James
got nitro?
04-19-2009 06:01 PM
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HawkProPilot
Senior Heliman
Location: Iwakuni, Japan

My Posts This: Topic  Forum
Quote 
If you would of read your manual you would of saw it said to ca glue the guides after getting them into the proper position. If you would of read the maunal you wouldnt be here today telling others of a "problem" that dont exist if you do what is said in the manual and is just commen sense to secure the guides.

This was my first ever build, better believe I read the manual. I did glue the guides as advised by a guy at my LHS(at the time). They came loose and I didn't know it.
The purpose of this wasn't to say the hawk has a problem there, it was to inform others, and hopefully save someone(another new guy like myself) a heli.

As for the better tail control system I mentioned. I am still thining about it, but I am going to try to come up with something that can not come loose. Any ideas?
04-20-2009 10:00 AM
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FBoss
Key Veteran
Location: Aurora Indiana USA

My Posts This: Topic  Forum		I use the type that secure with a wire tie. I normally only lightly snug them down the first flight or two so they can move to the position that best suites them, then lock em down tight.

The good ole times are now ,Hawk, Raven, Raven NX, Logo 10
04-20-2009 01:37 PM
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choppengruven
Key Veteran
Location: Flagler County, FL USA

My Posts This: Topic  Forum		Rule #1 in this hobby is to ALWAYS read the instructions. Large spinning blades make this necc.
04-20-2009 04:47 PM
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Zaneman007
Elite Veteran
Location: Texas - USA

My Posts This: Topic  Forum		That is an "old" issue. It is more of a Maint/flight check issue than anything else.

The method you are using may keep it from going back and forth, but the guide can still spin around. Thus, the rod will bend, and the defeats the purpose of the guide.

Take your Zip Ties and wedge it between the boom and the guide. This will "lock" it in place.



And you may want to do a pre-flight check list or not?

Old Guys Rule!
04-20-2009 06:09 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		I always just CA the guides, and haven't had a problem unless I put pressure on them. The CA snaps loose if you push on them at all.

I suppose if you really wanted to make sure they stayed put, I'd probably drill a hole, and put a short screw through the guide and boom. Little locktite, and it's not likely to come apart.
04-20-2009 08:10 PM
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DeadTom
Heliman
Location: Reno, NV - USA

My Posts This: Topic  Forum		The screw you would have to use would have to be small enough not to contact the TT in the boom, personally I would not do that but then again I said personally.
04-20-2009 10:21 PM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		for the Guides I use Electrical Tape under them, I use about 2 inches of Tape for each Guide, I put the Tape on the Boom (around the Boom), then slide the Guide over the Tape, then after the Guide is in-place I cut the access tape off, then all you see is the guide, been doing this since day 1 and I never had a Guide slip..

Jim
Buzz Buzz Buzz
04-20-2009 10:22 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		You'd probably have to dremel the screw to size. Wasps idea isn't a bad one either. As long as the support is tight on the boom I'm sure it probably wouldn't go anywhere.
04-20-2009 10:41 PM
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Furious Predator
rrProfessor
Location: Kitchener, Ontario, Canada

My Posts This: Topic  Forum		i have been using a technique i read somewhere....i think it was on Curtis Youngbloods website. i think it even says it in the manual, but i cant remember.

i use a single tie wrap like your supposed to, but then i put a single drop of CA on the guide. as previously mentioned, it sticks well enough for flight, but just put some pressure on it, and it will snap free pretty easily.

i havnt had any trouble with this at all.

Shawn
Team Leisure-Tech
Team HelixRC
04-20-2009 11:09 PM
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jim 73strat
Heliman
Location: Perth Western Australia

My Posts This: Topic  Forum		I had the same thing happen, nearly caaused a crash. I Just put some small cable ties around the boom

WA
09-17-2009 02:33 PM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		Jim,,, Jim here go up and read my reply, please don't use cable ties,,

when I use the Electrical Tape (Duct Tape will work too) under my Guides I use enough Tape that I have to work at-it to slid the Guides on over the tape,, I usually cut the Tape so it comes to a point then put the Tape on the Boom so the Tape points down the Boom, this makes it easer to "start" to slid the Guide over the Tape, as I said I have been doing this since day 1 and I have NEVER once had a Guide loosen,,

in the photo you will see I cut the Tape to somewhat of a point, then slid the Guide over the Tape, then once the Guide is in place cut along-side the Guide to remove the unwanted/excess tape, even after I cut the excess Tape off I can twist the Guide to aline the Guide with the Linkage,,,, it works and works well !!!! (sorry it's not a Century heli in the photo !!!!!!!)




Jim
Buzz Buzz Buzz
09-17-2009 10:01 PM
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imnxtc
Veteran
Location: Dawson

My Posts This: Topic  Forum
Quote 
It is more of a Maint/flight check issue than anything else.

Yes, this is the same type of tail rotor pushrod guide system used by many different manufacturers. And like Century, they also clearly state in their manual that they are to be glued securely to the boom after prober placement and alignment.

But they still should be part of a pre-flight check, simply because one or more of these guides can be knocked loose, simply by bumping against the house door while taking them out to your car or from the car into the house. And one may not realize it until he does the pre-flight or if he didn't, he may well have to suffer the consequences.

Definitely a lesson worth teaching/learning.
09-17-2009 10:18 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		Screw it !!!

I personaly like the screw method if using the stock tail guides.
you use a hot needle to make your pilot hole and a small screw to secure the guide, tighten till it just starts to bite into the tail boom.

you don't drive a screw right into the boom !!!

CA does work but it can come unglued on its own at any time

for the carbon tail rod I just use 1 guide in front of the horizontal fin and use the fin to hold the guide in place



F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
09-17-2009 10:27 PM
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the Wasp
rrProfessor
Location: Vt

My Posts This: Topic  Forum		glue will work, I have used it years ago but it can be ugly and messy, specially CA, turns finger prints white LOL, a screw may work but it's old school/caveman stuff, it will damage both the Guide and Boom and the screw can loosen while in flight,, the tape is clean and allows infinite adjustment,, try the tape once and I think you will change your method..

Jim
Buzz Buzz Buzz
09-17-2009 10:41 PM
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Blade_Master1
Elite Veteran
Location: Canada

My Posts This: Topic  Forum		I tried the tape
It gets covered in oil and comes undone in a sticky mess

I guess the old tricks are the best tricks (screw it )
What damage ? LOL
Screws coming loose you could always CA it, if it becomes a problem.
of course if your machine has a vibe then nothing will stay tight

F-27
MSR
Terminator Raven
NX Pro
Raven50
K50
HawkPro(~rip)
Swift 550
09-18-2009 12:14 AM
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reddragon
Key Veteran
Location: Brooklyn, N.Y.

My Posts This: Topic  Forum		I use a toothpick and some GOOP, wipe off the excess. Works like a charm.

Wayne -- Fly it like you stole it!
09-18-2009 01:13 AM
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Century Hawk - 50NX - Raven - Predator > Near Mishap with Hawk Pro
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