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ProModeler Scorpion Power
06-02-2010 10:03 PM  7 years agoPost 1
ff7

Heliman

Bosnia

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This is my story about Radical.After few months of reading posts about Radical I decided to get one so I sold my Trex 600 gasser and bought Radical with LT head.I had a few problems with the assembling kit as I wrote in this topic https://rc.runryder.com/helicopter/t587173p1/ . I made a few modifications.First,there was not enough space between the lower and upper bearing so I had to trim the mast stopper to put everything like it was in the manual,the second problem was the tail transmisson gear which was probably from kit with 84 tooth main gear,so I had to trim it also so it does not hit in 90 tooth main gear that I received.After assembeling kit I tried to start it with the starter and after a few starts hex coupler sliped in starting shaft.That was a new problem for me but I disassembled cluch and fixed that.After that I started engine and tried to hover but vibrations on vertical fin were so strong that I immediately landed.I tried to change tail rotor blades but that did not resolve my problem.I thought that the problem was tail pitch slider that was made like a child had made it.It`s plastic finish that is so bad I could not believe
in that so I ordered a new one.Look for picture.Picture is bad because of flash but just loke how is plastic finished.Now I`m waiting for the new metal tail pitch slider.After all that had happened with new Radical I received warning from store where I bought kit with suggestion to conctact Paul at Heli World and I was told that he will resolve problem with blade holders.A few mails to Century and a few mails to Heli World and I didn`t receive a single answer about replacing LT blade holders for metal blade holders.I can not believe no one from Century or Heli World want to answer my mails.
After all that happened I tried to hover again and one way bearing was screaming.I recorded a short video by phone.Here it is. http://www.youtube.com/watch?v=Cg-F5sBhyYA
I`m sorry for a bad video,but just listen how my one way bearing sounds after 5 minutes in hover.
All of this that happened with my new kit is pretty disappointing for me.I thought that Radical will behave like my Predator,without problems,but I was wrong.
Such things would not be allowed to happen with the new helicopter.I understand that every heli has problems but the worst thing with Radical is that I did not receive one single answer from Century or Heli World.
Finally I do hope I will be able to fix all this and fly it but this is hard begining with new heli from whom I expected a lot.

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06-02-2010 10:14 PM  7 years agoPost 2
Century Heli

Senior Heliman

CA. USA

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Sorry for any inconvenience this has caused you. We do not see any emails from you. Please PM us. I know our service provider for centuryheli has had some issues lately. If you try to hit centuryheli.com right now, there is a problem with the server and they are working on it however, prior to today, we do not see any emails related to the problems you have described in this thread. We don't know if any emails are being rejected due to our service provider issues.

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06-02-2010 10:39 PM  7 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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Really?

Sorry for any inconvenience this has caused you. We do not see any emails from you. Please PM us.
I tried that, PM'd you FIVE times and no-one answered those PM's either. Maybe you only answer the people you want to answer.

Sent
Re: Who are you anyways? Sent to:
•Century Heli 7 05-27-2010 12:12 AM
Sent
Re: Can we get this case closed? Sent to:
•Century Heli 7 05-26-2010 03:45 PM
Sent
Re Topic: OFFICIAL RADIKAL LT HEAD WARNING! Sent to:
•Century Heli 7 05-25-2010 06:32 PM
Sent
Re: How come you don't answer me Sent to:
•Century Heli 7 05-25-2010 01:12 AM
Sent
Re: LT Head Sent to:
•Century Heli 7 05-23-2010 01:08 AM
Inbox

Not only this, but I called every business day since the faulty LT head announcement and left a message for Paul to call me, and got no calls back. Yeah I did email too to Paul@heli-world.com, but like you say maybe the email service is down.

-=>Raja.

MA 1005 H280, 4091 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3173 flts
Whiplash V1 27 3DMax, 1360 flts
Whiplash V2 H300, 123 flts

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06-02-2010 11:51 PM  7 years agoPost 4
Billme

Elite Veteran

MS

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You have some how done something with your Modification that will put uneven forces on the thrust bearing.. I can't tail if your noise is not coming from it..
If you modify, it must be done on a system to insure its square...

You need to do as the FYI says for added success..

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06-03-2010 12:21 AM  7 years agoPost 5
JuanRodriguez

Elite Veteran

The Villages, Florida

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Don't worry, rbort.....

I know someone that will be rustling those pom poms very soon and will make all of those issues go away.....

Been there, done that and old enough to know better.....

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06-03-2010 05:27 AM  7 years agoPost 6
ff7

Heliman

Bosnia

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Century Heli I send you PM with copy of my mails.

Billme
This is not big modification as I said I just trim mast stopper to make place for thrust bearing.If I have not done this then we could talk about uneven forces on the thrust bearing.At the end I will probably take out trust bearing as Zman done and try it that way.But now I must wait for new blade holders and pitch slider so I could continue to work on this heli.And yes noise is coming from one way bearing.I take everything apart again to make sure where the noise come from.

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06-03-2010 05:58 AM  7 years agoPost 7
Billme

Elite Veteran

MS

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We are advising folks to clean the bearing first before you fly it, and add the extra cross over support at the canopy stand offs positions...

BTW, I recognize that sound, but it was binding at the thrust bearing, that when I done it my way as explain in the FYI

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06-03-2010 12:45 PM  7 years agoPost 8
Zman

Key Veteran

Florida

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ff7,

Hang in there. Lets take one step at a time and we will help you get this bird singing. And once you got it singing, it will be hard to put it down.
Feel free to pm or ask here any questions or concerns as you continue with the process and we will work with you through it.
You will always find negative on any heli in these forums if you look but keep your focus on the big picture which is how many guys in here are having fun with it which is where we will get you!

Since I am not there, I can only speculate on vibs you are referring to. Even with a stock engine, tbis heli can be as smooth as a 50 nitro. In my experience (multiple gassers, multiple brands over the years), I can say that 80% or so of vibs in tails on gassers I seen in particular, especially belt drives, is an engine tuning issue. I dont like to go by needle settings as it will always vary a little depending on climate, altitude to name a few but if you let me know where your needles are on the engine I can let you know if it is in ballpark for a smooth engine.

As far as blade grips, pm century above and let them know your address and where you bought heli and I am sure they will take care of you as soon as new grips are here.

Z

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06-03-2010 05:58 PM  7 years agoPost 9
genovia

Elite Veteran

N UR NECK OF DA WOODS

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Nice to see old common flyers here in RR.. How ya doin, Juan?

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06-03-2010 08:17 PM  7 years agoPost 10
JuanRodriguez

Elite Veteran

The Villages, Florida

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Nice to see old common flyers here in RR.. How ya doin, Juan?
Outstanding ! Thanks for asking !! It's nice to be amongst friends.....

Been there, done that and old enough to know better.....

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06-03-2010 08:23 PM  7 years agoPost 11
Billme

Elite Veteran

MS

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Heck, lets just break out the rum while we at it

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06-03-2010 10:32 PM  7 years agoPost 12
ff7

Heliman

Bosnia

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One way bearing is thoroughly cleaned as recommended and i put a few drops of light oil in it.Bearing began whistle after that.I take all apart again and cleaned the bearing again but this time I put one way bearing grease in it.Now bearing seems to be good and acts ok but I have to fly a helicopter so that I could say more.

Needles on the engine currently are on a low 1 turn and high on 1 ¼ turn.Just a note that this is the engine that was flying over a year in other heli.
My assumption is that vibrations is not from the engine but from the poor made tail pitch slider, and therefore I have ordered a new metal tail pitch slider.I put a couple of better pictures of tail pitch slider in my gallery but in reality looks worse then in the pictures. I looked at pictures of yours tail pitch slider, and mine looks much worse than yours. I also doubt that most of the vibration was from tail trasmition gear that hit in the main gear. I repaired that and vibrations are drastically reduced, but still there are a little vibration. The only thing I could do more was to order a new tail pitch slider and then see what happens.

I only wish to note that this is not an attack or an objection to manufacturer.I'm fully aware that each helicopter has some problems and of course that I appreciate Century reports of the possible disadvantages of the heli.I just want to resolve my problems that occurred . In the end I want to fly like everyone else here.
Thanks for helping me to resolve my problems.

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06-04-2010 12:45 AM  7 years agoPost 13
Billme

Elite Veteran

MS

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We want you to also..high needle seems lean to me...Go fly it and get some time on it if that has relieved the shakes..To me on a stock engine with the low that lean, your high should be 11/2 to 15/8s open

Put you a cross -over bracket where the canopy mounts are like you did in the trex.. this will stiffen up the top frame ....Most who have done this, the problem went away...

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06-04-2010 02:24 AM  7 years agoPost 14
seflyer

Senior Heliman

Northern California, Palo Cedro

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my biggest problem with a vibration I was chasing was the tail belt not being tight enough. Sparx suggested this and it cured 99% of my vibes. sadly I lost the Radikal last weekend due to a broken servo arm. pretty much a total write off of mechanics and engine. does fly great though when all tuned up.

Kevin

My heli is right side up -- the world is upside down

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06-04-2010 04:43 AM  7 years agoPost 15
bobmoser

Senior Heliman

Edmond, OK

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Tail grips...

Hey ff7,

Did you check your tail grips? I had some horrendous vibrations on my tail until I balanced the tail grips. When I weighed them one was way heavier than the other so I had to shave, sand and remove all kinds of plastic before they were a match. After I got both tail grips weighing the same my tail vibes were solved. Just a thought, hope you get everything worked out. I love the hell out of mine.

Bob

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06-04-2010 11:19 AM  7 years agoPost 16
Zman

Key Veteran

Florida

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hello ff7,

We will get you there ..........I agree with Bill, try backing out that high at least to 1.5 and see if the shakes get any better. Only other thing is make sure you size the links on the whole tail assembly, these links are pretty tight out of kit. With that said, I have found that tight tail links dont really cause vibs per say, more of an inconsistent tail (drift, small wag for example). Do the needles and check the belt as Sparx mentioned and I bet your vibs will be better. Keep us posted!

Z

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06-04-2010 12:40 PM  7 years agoPost 17
ff7

Heliman

Bosnia

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I will try to do what you suggested and I hope that I will fly it for a day or two so that I will then be able to tell whether I still have vibrations and how it behaved.

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06-21-2010 12:25 PM  7 years agoPost 18
ff7

Heliman

Bosnia

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The problem with vibration in the tail is resolved.I balance blade holders and put metal tail pitch slider, and now there is no vibration. Needles on the engine are now set to a low 1 turn and a high 1 1/2.I take out thrust bearing but my problem with one-way bearing is still here but now if I land heli he won`t let go and blades continue to spin.I will try again to take him down,clean it and put few drops of oil.It`s interesting that only after a few minutes of flight one way bearing starts to behave strange and after it cool down again everything is ok. As I said I will take it out and try to lubricate it with light oil again.

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06-21-2010 03:51 PM  7 years agoPost 19
James Kovach

Key Veteran

canton, oh - US

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It`s interesting that only after a few minutes of flight one way bearing starts to behave strange and after it cool down again everything is ok.
This is not the one-way. It is the clutch. I had the same thing happen to one of mine. The clutch "sprung". If you look at it, the spacing in the cuts will not be the same all the way from start to finish. I believe what has happened is your clutch has been slipping. This will cause the clutch shoe to heat up and lose strength. When it heats up, it expands and engages and does not let go until it cools off again.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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06-21-2010 04:56 PM  7 years agoPost 20
rbort

rrProfessor

Franklin, MA - USA

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One other possibility

I take out thrust bearing but my problem with one-way bearing is still here but now if I land heli he won`t let go and blades continue to spin.I will try again to take him down,clean it and put few drops of oil.
Did you remove the two shims that go in-between the clutch and the fan as stated in the manual? I found that with those installed, after the engine warms up things expand and the clutch touches the top of the bell which causes the blades to keep spinning all the time at idle. When everything cools off this goes away.

If you haven't already done so, remove those shims and it will give you some relief expansion gap what will prevent this from happening in the future.

-=>Raja.

MA 1005 H280, 4091 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3173 flts
Whiplash V1 27 3DMax, 1360 flts
Whiplash V2 H300, 123 flts

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