rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 734 ONLINE 73 EVENTS SEARCH REGISTER  START HERE
 
1 page193 viewsPOST REPLY
MTA Hobbies . MRC/Altech Marketing USA . Next D

.
.
RJX Hobby Hurrican 50 - Xtreme 50 > Clutch bell and vibrations problems
 
 
AirMail
New Heliman
Location: Earth

Hi all,

I have problems with my xtreme 50. The clutch bell pinion gets grinded and gets very loose inside the bearing. This is my second clutchbell in just a short time, and even if it´s JB welded in the bearing it gets like this. Before putting on a new one I would like to know if someone has a fix for this. I also have vibration issues. Blades, paddles and tail are balanced, still I get vibrations. Engine is tuned fine, belt is now on the loose side, but I tried to have it tight as well without any improvement. It got better when I slacked it some. Could this be a bearing issue of some kind? The machine is new, only flown around 40 flights.

Should the gearmesh be on the tight side? Afraid to strip gears if it's to loose.

What could cause these kinds of vibrations? Motor mount, gear mesh, bearings, what?

Please help!
05-07-2008 02:27 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

AirMail

Since there are nemerous things that can cause a vibration, we need to get a bit of information so we can systematically try to help you get this fixed.

Which gear are your running, blue straight or the new helical white gear?

What engine?

What Blades?

What paddles?

OK, I have been using the regular black/red JB Weld (the overnight stuff)I clean the inside of the pinion bearing block bearing and top of pinion with 91% alchol and apply a good portion of JB weld and let sit overnight.

next loosen up all the bearing blocks, 3 on the main shaft and the clutch bell bearing block and make sure the mainshaft is spinning nice and free in the bearings, also remove the main shaft and roll it on a piece of glass and make certain it rolls flat and true, also chec the feel of the main shaft bearings and make sure they are smooth and not gritty. Next pull the spindle and roll it on a piece of glass and make sure it is also flat and true.

Gear mesh is next, you should set it snug with very little backlash on both the tail drive pinion gear and the mainshaft to the clutch pinion, also make sure you tail belt only has one twist 90 degrees, I've seen a double twisted belt cause some vibrations. Also make sure when you set the clutch up into the clutch bell you can see the bottom of the clutch even with the bottom of the bell, too far up inside and it can contact the top of the bell and cause problems.

Here's a start, keep us posted and we'll try to help.

Thanks,

Clyde

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
05-07-2008 08:06 PM
HOMEPAGE  
 
 
Tom Viper
Senior Heliman
Location: Gothenburg, SWEDEN

The gear mesh should be snug, otherwiser it can strip the gear. Take extra care of this and you will not suffer any problems.

Its crucial that you use epoxi (or US version = JB Weld) on the clutch bell/pinion where it goes inside the bearing.

Make sure that the gyro plate is tight, I have seen on some machines that this can move around a little. So use a tiny bit of CA glue to secure it. The vibrations/tail hunting can come from this.

Keep the belt loose enough so you can puch it in 5-6mm just after the front pulley, a tight belt not only eats power, it can also lead to vibrations and strange tail behaivor.

All shafts must be true, but a take this for granted that it is (and you have checked). Even if the mainshaft is new, take one extra look at it, it has happened they are bent as new...

I had some very nice flights on mine today.
05-08-2008 10:35 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

Good catch on the gyro plate Tom, I did the same thing on ours, a dab of CA to lock it in

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
05-08-2008 10:56 PM
HOMEPAGE  
 
 
I3DM
rrProfessor
Location: Israel

I use green loctite (bearing compound) on the pinion gear when i built the mahcine and had no trouble since.

but Foxden's tip on making sure all shafts are aligned in their blocks in a good one !

Team pilot for RJX, Helidirect, Logictech, ThunderPower, Fromeco
www.liorzahavi.com
05-11-2008 12:29 PM
HOMEPAGE  
 
 
1 page193 viewsPOST REPLY
Futaba-RC . Fast Lad Performance . Esprit Model

.
.
RJX Hobby Hurrican 50 - Xtreme 50 > Clutch bell and vibrations problems
  UPDATE SCREEN   PRINT TOPIC Advertisers 

Subscribe to This Topic

Tuesday, May 13 - 3:35 pm - Copyright © 2000 - 2008 runryder.com | email | link to rr | runryder needs cookie