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Century Helicopter . MTA Hobbies . Model Rectifier Corp

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Safety - RC Helis are not toys > A Tail Rotor Flew Off-Just missed my head!
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

I was practicing hovering my Kyosho Concept 30, and was just bringing up the throttle, as it was still on the ground. All of the sudden a tail rotor blade with set screw and rotor hub bearing come flying past my head. I found that assembly about a hundred feet away. It took me a moment to realize that if it would have hit me at that speed, it would not have been a pretty picture. It seems the set screw came loose. I was under the impression these screws would not come loose, but guess I was wrong. Being a novice, I now have learned something new.....don't trust that any screw will stay tight on a Comcept 30. Has anyone else experienced a similar situation?
02-10-2004 Over year old.
 
 
Drunk Monk
rrProfessor
Location: Preston, UK

I've seen tail blades and holders come of a couple of rappy's in flight and never found them afterwards. That's one reason to make sure you don't fly to close to yourself just in case.


Stephen

I only open my mouth to change feet.....
02-10-2004 Over year old.
 
 
shootist
Senior Heliman
Location: New York State, East Coast US

That's also a good reason to never hover with the main blades at face level, or with the tail in the same plane as your face.
02-10-2004 Over year old.
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

You are right about that. However, I also believe I was a little too close the the heli when I started to throttle up. I was about 4 or 5 feet away. Believe me, I will be further next time. Also, are Concept 30s notorious for having problems like this? Or is just because I am so inexperienced? Or, maybe, it is both.
02-10-2004 Over year old.
 
 
Drunk Monk
rrProfessor
Location: Preston, UK

4 or 5 feet isn't far away at all, look at it this way, if the heli was in a hover at head height at that distance and thrown a tail blade , it would have just started to spin round very fast and possibly hit you. Everyone learns by there mistakes and close calls, like you said though next time it will be a lot further away so you've learnt a valuble lesson


Stephen

I only open my mouth to change feet.....
02-11-2004 Over year old.
 
 
sbalder
Senior Heliman
Location: Westland, Michigan

I had a pcm lockout on my "hanger queen" X-cell when hovering in the backyard a few years ago. The tail gear box and guts were found two yards over and directly behind where I was standing. Since then I will not takeoff without at least some kind of eye protection- usually sunglasses if not safety glasses. I don't fancy getting hit with any dislodged part, but an impact or cut from a dislodged tail rotor is no comparison to taking the same part in the eyes.

I'm an okay pilot and as I struggle to learn 3d maneuvers altitude and distance are my bets for safety and survival of my machines.

-Steven Balder
02-11-2004 Over year old.
HOMEPAGE  
 
 
NYJR13
Heliman
Location: New York City, New York, USA

No, your not bad at it, the C30s (the 2 I had) were NOTORIUS for doing that, I replaced the tail stuff with metal on one of them and that cleared it up. The other uses the same tail setup as the Nexus (stock(=) and thats fine too. Those blades just flyoff, its scary.
Raptor = better
But the C30 is a lot of fun

Winning the fight against gravity 24/7
02-16-2004 Over year old.
 
 
River Rat
Senior Heliman
Location: Mt Wolf, Pa.

A couple weeks ago my friend and I set up a Venture w/OS50 for a plank flyer. I found loose screws in the head and tightened them up. when we went to check out the tail rotor, we found that he had put on a blade holder from some other machine and used a brass pin, peaned on both ends to hold it on the the shaft. Not only was there all kinds of slop, but the danger was up there on the point scale. We then tried to tell him about the dangers of these things and get him pointed in the right direction. He bought a new holder made for the Venture and we then checked it out , with everything being okay. When this guy comes to our field to fly we check his heli out and then jump in our cars to watch. Naturally our heli's also go in the back for protection.
02-16-2004 Over year old.
 
 
Raptor Rulezzz
Key Veteran
Location: Rockanje, Zuid-Holland - The Netherlands

I had the same experience, we put some Raptor parts on it...

Good luck,

Rich



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl
02-16-2004 Over year old.
 
 
optikaman
Veteran
Location: EnglishTown N.J.

This will happen to any heli if you don't do maintance and check over the heli each time you fly it. The problem is not with the heli but with the owner/builder. you need to throughly clean all threaded metal parts and use loctite and check all set screws and bolts during the flying season.


Alan...
02-17-2004 Over year old.
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

Thanks, for the caution on those screws and bolts. I am learning allot with my C30. Believe me, I am going through everything on this heli. It appears loctite is going to be my friend. Being a RC plane flyer, I am not use to parts falling off like that. Unfortunately, I have seen veteran heli flyers bring their heli's to the field, fire them up and fly. Maybe they checked them out prior to coming to the field. Who knows.
02-17-2004 Over year old.
 
 
optikaman
Veteran
Location: EnglishTown N.J.

crazyeddie320 , when you are done flying for the day you take the heli home put it on charge this would be a good time to go over the heli. clean it and check over the bolts and set screws. it will take you all of ten minutes and you will know all is good.

It is better to find that loose or broken bolt/screw or cracked frame on the bench then during flight where something will flyoff and cause a crash.


Alan...
02-17-2004 Over year old.
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

Thanks, Optikaman, that is a good idea. I have flown my heli since the incident, but now I always check it over before each flight. It is performing well and I am further back from it than before.
03-03-2004 Over year old.
 
 
blazen
Senior Heliman
Location: California

Concept 30’s tail rotor as a weed whacker ??

Having owned quite a few concepts 30’s over the years.. And having trained many of pilots with them. I have seen this happen quite often !!! Concept 30’s seem to be notorious for throwing tail blades.. The problem is usually caused by flying off tall grass.. In this situation the tail blades are acting like mini lawnmowers..

Every single Concept 30 I have had the chance to inspect that has thrown a tail blade has showed the same symptoms, Grass Stains on the tips of the tail blades along with some nicks and small chips in the leading edge of the tip of the tail blade. I’m sure this is not the only reason but I am positive it is the most common.. The early concepts used small setscrews as a tail rotor spindle. These setscrews were fully threaded “Big Mistake” consequently they could not tolerate much abuse before failing.

In your post you indicate that the entire hub came off in flight so this might not apply in your situation But keep in mind that trying to use your concept 30’s tail rotor as a weed whacker was slightly more abuse then they where designed to take..
03-03-2004 Over year old.
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

Thanks, Blazen...you were correct. I did fly my C30 in grass and the stains proved it. I now fly on hard smooth surfaces or very short grass. I probably used the wrong verbage when I said "hub". It could have been the hub bearing. The tail rotor blade came of with the grip still attached, a metal piece(possibly the bearing) and the set screw.

Is there anything I can do with this set screw, other than use loctite on it? I now check these screws for tightness about every 3 flights. Should I do more? I appreciate your help, as I am still learning this stuff.
03-25-2004 Over year old.
 
 
Twobeers
Key Veteran
Location: Toronto, Canada

"Is there anything I can do with this set screw, other than use loctite on it? I now check these screws for tightness about every 3 flights. Should I do more? I appreciate your help, as I am still learning this stuff"

First off, don't over tighten fasteners. Tighten to scale. What is scale you ask? Simple, think of it this way, You are not going to use as much force to tighten a headlight or tail light screw as you would a wheel nut, would you?
Second, checking the screws with a screw driver or allen key only breaks the locktite bond and the locktite can't do its jop. Which is does quite well, most of the time.
Third and not last, putting the locktite on and then flying a couple of minutes later. Forget about it. If you want the locktite do to its jop 100%, clean the parts to be locktited as best as you can with alcohol, apply the locktite and tighten. When everything is finished. Set the heli aside. Don't even breath on it, as matter of fact, don't even look at it. Let it sit for 24hrs. This will allow the locktite to bond and cure properly.

I lost my infamous tag line.
03-25-2004 Over year old.
 
 
crazyeddie320
Heliman
Location: Albany, Oregon USA

Thanks Twobeers,

It is amazing what one can learn from this site. Apparently, the loctite is working. When I did check the set screws, I could not move them, unless I really tried hard, so I just left them alone. Fortunately, it had been several days after I had loctited the set screws, that I had flown my C30. Everything looks good right now.
03-26-2004 Over year old.
 
 
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Safety - RC Helis are not toys > A Tail Rotor Flew Off-Just missed my head!
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