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MTA Hobbies . MRC/Altech Marketing USA . Next D

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RJX Hobby Hurrican 50 - Xtreme 50 > X50 wobble
 
 
jonzey
Heliman
Location: new zealand

Have just finished building my X50 and test flew it the other day, not to long into hoverning and the heli started to wobble. Just wonderning if any one else has had this this problem? can't figure out what it could be. Any help at all would be great.
Cheers.

see it want it buy it...
04-14-2008 10:17 AM
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

Did you lube the dampeners when you built the head? If not then the spindle will not be able to rotate freely and that can cause it too wobble. I use dielectric grease to lube the dampeners. Every time I remove the spindle, I relube the dampeners.

Check your links too. If they are too tight, then this can cause some wobbles.

What head speed does the wobble happen at? When I first started flying mine, I would get a wobble at low head speeds. Now that the dampeners are worn in, I no longer get any wobble. It could be that since it is a brand new machine, everything needs to be worn in.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
04-14-2008 10:43 AM
 
 
lpearce
Senior Heliman
Location: NZ

I have built two X-50's and am currently building my third, on the first two i used tri-flow on the dampeners and sized the links and have not had any issues with nodding/wobbles at all even with low headspeeds of 1600-1650, Yet i have a mate who has built one and has a bad wobble at 1650 while hovering, It goes away when the headspeed is bumped up to 1800 however. I think in his case it is a matter of low head speed combined with new hard dampeners, and possibly a new engine running rich that also contributes somewhat. There are only a few reasons for a heli to wobble so its really a process of elimination IMO.
04-14-2008 12:37 PM
 
 
Tom Viper
Senior Heliman
Location: Gothenburg, SWEDEN

The Hard dampners are probably your reason. Lube them and the wobble goes away.

You can also try another trick, this works perfect.
Put the dampner on the starter shaft,spin it and use a file to cut down 1-1.5mm (see pic).

04-14-2008 01:07 PM
 
 
Razz
Senior Heliman
Location: Louisville, KY

I actually am using some Raptor 50 red dampers with no lubrication. I used a shortened blade axle to put the damper on, chucked it into my drill, added a washer and 4mm bolt to compress it against the drill chuck. I then spun the drill up against a belt sander, or you could use some coarse sand paper. Made the diameter slightly larger than the head ID. It's working great! I still had some wobble trouble with the stock hard dampers after 25 flights, using triflow sythetic grease, and all my links were fitted perfect, no drag. I even took about .020 in. off each of the spacer collars to reduce the preload...still didn't relieve my wobble around slower head speeds.

Brian

Spektrum DX7, Hirobo Lepton, Vibe 50, Aurora
04-14-2008 02:22 PM
 
 
buzzsaw
Key Veteran
Location: AREA 51

Stock damptners,grease them well,get that head speed to 2150 for a flight or two and problem gone,they just have to settle in a bit.also weigh the padles and check distance from flybar cage to end of flybar and do the same to the inside of the paddles as this has to be just right.

Cajun Helicopters
04-14-2008 06:56 PM
HOMEPAGE  
 
 
jonzey
Heliman
Location: new zealand

Thanks guy's for your help will try some of them and see what happens. Won't be running it at 2150 till the engine is run in, brand new TT53. Cheers.

see it want it buy it...
04-15-2008 09:58 AM
 
 
lpearce
Senior Heliman
Location: NZ

I ran mine at 2100 while breaking in... But i only do 3 or 4 tanks really rich and call it done. (just the way i do it, I break my engines in how i intent to fly them. Not saying you should do the same.) But ive Never had any issues with my hypers or my TT53 this way. It should be fine to run it at 2100 just make sure it doesnt get hot.... even just try 1800-1900 and see what it does.

By the way, I now fly mine at 2200rpm on 30% and im
04-16-2008 06:09 AM
 
 
I3DM
rrProfessor
Location: Israel

By all means this is a combination of a stiff head and low headspeed. im 99% sure its nothing more.

Team pilot for RJX, Helidirect, Logictech, ThunderPower, Fromeco
www.liorzahavi.com
04-16-2008 07:00 PM
HOMEPAGE  
 
 
Wingspinner
New Heliman
Location: West Memphis, AR-USA

Same problem, I think

I used white lithium grease when I built my X50, but the spindle was still really hard to get in the head. Will that grease suffice, just add more, or do I need the lubricant mentioned in the post and where to find it? I've only flown, hovered mostly, two tanks because the shaking (not all the time) has me a little nervous. I just checked the head again, even put it in the high point balancer and it checks out. I am running a Hyper50, Curtis Youngblade 600's and stock paddles. But I am not using a governor at this point and this is my first real 3D machine, upgrading from the heavy (8lbs 4oz MT) Airskipper.
Thanks
04-29-2008 05:04 AM
 
 
lpearce
Senior Heliman
Location: NZ

what head speed are you running? Ive noticed that the wobbles seem to go away up around 1750. Once the dampers are worn in more you are able to drop it a bit... Just my observation..
04-29-2008 06:21 AM
 
 
jonzey
Heliman
Location: new zealand

wobble finally gone got head speed up to around 1950-2000 and it is super smooth and extremly stable, or should I say was super smooth and extremly stable. That little bolt that holds the tail shaft in vibrated out, you know the rest.

see it want it buy it...
04-29-2008 10:47 AM
 
 
lpearce
Senior Heliman
Location: NZ

I had my whole tail assembly come off in flight a couple of weeks ago. (Id just put the metal grips/hub on.) because of some dodgy lock tight I was about 100ft up and 100ft away (roughly) when it happened and it just started spinning out of control. I hit Throttle hold and managed to do a fluke auto to about 5m away from my feet. man i was stoked, I at least expected to tip it over at the last second, but no other damage was caused. Two new grub screws and i was back in the air.....All those autos and practice autos on the sim paid off.luck played a big part to tho...
04-29-2008 11:06 AM
 
 
jonzey
Heliman
Location: new zealand

Lucky bastard

see it want it buy it...
04-29-2008 11:09 AM
 
 
Salby
Senior Heliman
Location: Christchurch New Zealand

Jonzey

Instead of using the grub screw up the inside of the shaft, just use a normal cap screw. Then you can tighten it down quite a bit firmer.

Robin Sallabanks
04-29-2008 11:59 AM
HOMEPAGE  
 
 
jonzey
Heliman
Location: new zealand

Hi Robin, cheers for the tip, how did you find the standard head settings? It seems extremly stable in hover but i'm wonderning how it will perform with those settings in 3D?

see it want it buy it...
04-30-2008 10:44 AM
 
 
Salby
Senior Heliman
Location: Christchurch New Zealand

RJX X50

Hi Jonzey

Will take a few photos of my head setup & send them to you, Ive been playing around with a few different settings & now its really starting to crank.

The basic settings are very stable & tame, you can still do 3D with these settings but your roll rate will be very slow.

PM me your e-mail address

Cheers

Robin

Robin Sallabanks
04-30-2008 11:01 AM
HOMEPAGE  
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

What set up are you guys running on the head? Here's how I have mine set up and the cyclics are very fast, yet provide a stable hover and straight FFF without any pitchiness.

From the washout arms:

washout arms - outer hole
mixing arm - inner hole on short side and middle hole on long side
main blade grip arms - middle hole
flybar carrier - middle hole

Here are a couple of pics of my set up. I am now using 95mm V-paddles and 610mm Rotortech 3D blades. This combination is very fast and capable of anything you can throw at it.





Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
05-01-2008 05:16 AM
 
 
jonzey
Heliman
Location: new zealand

found out exactly why my tail fell apart, it was the little pin that goes through the pully and tail shaft, why would this fall out???

see it want it buy it...
05-01-2008 12:07 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

jonzey

There is a small set screw that is inserted from the outside of the tail shaft on the oposite side of the hub that secures the drift pin in place, it sounds like it got loose.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
05-01-2008 12:24 PM
HOMEPAGE  
 
 
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Futaba-RC . Fast Lad Performance . Esprit Model

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RJX Hobby Hurrican 50 - Xtreme 50 > X50 wobble
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