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HeliHobby . Ron’s HeliProz South . Century Helicopter

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RJX Hobby Hurrican 50 - Xtreme 50 > Maingear problem
 
 
helicrasher
Senior Heliman
Location: Belgium

Hoi,

Have a little problem on the bird!
Second flight and the maingear did get stripped.
Was doing some tic-toc's and pumping stalturns and in the pumping stalturn the maingear get stripped. (looks like melted, al the teeths are flat)

Been flying for 6 years, also have a TRex on 10S with NEU 1515/2Y (witch are know to strip) and never stripped a maingear.
Did the distance mesh with a paper like mentioned in the manual.
Checked the mesh with the hand.
Did good alignment of the motor.

For the rest, the bird is looking very promissing and is overal good quality and need NO upgrades.

What went wrong?

Thanks guys for your opinions.

Mario


(also posted in hf forum)
10-22-2007 08:24 PM
 
 
Danny Calderone
Veteran
Location: South Jersey

Well, you may have gotten a faulty gear, no product is ever 100% perfect. But even having set your gear mesh properly during the build, the pinion bearing block could have shifted in flight. The only way to be sure is to not touch the bearing blocks, and then replace the gear to check the mesh. This way you will know if it moved or if the mesh was not the cause.

Danny Calderone.
*********************
Magnum Fuels
10-23-2007 12:02 AM
 
 
helibuilder19
Heliman
Location: CT.

main gear

Yep, I did that to. I set the gear mesh alittle to loose and zipped the teeth off. I got a new one and found out the mesh had to be set alittle on the snug side at the high point of the gear, after it ran in a few flights all is good.
10-23-2007 01:13 AM
 
 
helicrasher
Senior Heliman
Location: Belgium

Hoi

Thanks for the response and help so quick.

If I'm not mesh up the second gear, maybee I did a little faulty measerment or had a bad gear.

However Doctorgoodwrenc notice that the raptor 50 gear was a direct fit so I will place one to test on saterday.

My dealer, Alex from rcmarket, said XJR-hobby will ship spareparts on friday so it will be next week for the parts to arrive!

Thanks,
Mario
10-23-2007 07:50 PM
 
 
Diamondd1968
Senior Heliman
Location: Oldham, Lancashire, England

I've had the same problem on a customer machine. Everything was tight and meshed correctly but what I found was the pinion gear bearing surface was 0.26mm undersize in the upper bearing block. IMO I think this allowed the mesh to vary and hence strip the gears (melted).

Dave Dunphy
Diamond Helicentre Ltd
10-23-2007 09:03 PM
HOMEPAGE  
 
 
Danny Calderone
Veteran
Location: South Jersey

Thats odd, mine was a very good press fit. Are you sure the customer didnt resize it himself because it was "too tight"?

Danny Calderone.
*********************
Magnum Fuels
10-23-2007 09:07 PM
 
 
Diamondd1968
Senior Heliman
Location: Oldham, Lancashire, England

Definitely not, I built it for him...He has about 20 flights on it, just gentle beginner stuff with no issues, then bam.. The teeth on the gear melted down onto the tail gear. I've never seen anything like it and can't explain it. There is no damage to the aircraft, so the discrepancy on the pinion is the only thing I can see that is not quite right. All the screws where still tight, mesh on the tail side was perfect. Now as I see it the clutch bell is basically unsupported, since the only items centering it are the pinion bearing and the start shaft, which says to me that if the bearing in the top is slack the whole assembly can move.

Dave Dunphy
Diamond Helicentre Ltd
10-23-2007 09:41 PM
HOMEPAGE  
 
 
Danny Calderone
Veteran
Location: South Jersey

Wow, that is odd.

Danny Calderone.
*********************
Magnum Fuels
10-23-2007 09:49 PM
 
 
Obiwan
Veteran
Location: Sevilla, Spain

Use raptor 50 85T grey gear. It's a tight fit for the first flight but it will smooth out as you fly. ALternatyvely you can "slim" it a little bit with a lathe if you've got one.

Other workaround is to use JR clutch bell and pinion.

Both work very well and will resist hard 3D abuse.

They are bringing new main gears this week I think so you don't have to mess with raptor or JR stuff.

Other than that, the machine is a blast!! I'm really impressed.

Best way to predict the future, is to Invent it.

FORMERLY KNOWN AS ForrestGump
10-26-2007 09:03 AM
 
 
helicrasher
Senior Heliman
Location: Belgium

Hoi to all,

PROBLEM SOLVED, was building issue!

Did change the maingear with the raptors one.
Still had same issue : melting on the top of the maingear.
So I disassemble the whole drivetrain!

Bought the heli partial assembled from a man that told me:

"heli is build perfect and locktite applyed on al metal parts"

What I found!!


Middle bearing holder was mounted upside down so the autorotationblock was rubbing against the flange of the bearingblock.
To eliminate this problem builder had put two!! extra collars between upper and middle bearingholder so he could positioning the mainshaft and stop the rubbing. Of course the positioning was NOT perfect and in flight the maingear was touching the engine pinionblock, heating and melting!
When I called him to tell him what was going on with the two extra collars he told me it was a security issue, he liked it better this way, it was safer.
He did not told me he had trouble with positioning the mainshaft.

So I flipped the bearingholder and removed the two extra collars.
Autoroationblock can now take position against the bearing of the middleblock (flange is facing upwards now) and all is fitting like it is suppose to be.

-of course this issue is costing me an original maingear
-extra raptor maingear (also melted at top, 1.5 mm smaller, but holding for now the testflights)
-a toasted engine from overreving. (pistonring and to be sure pistonliner and piston is also changed)
-maingear had to be sanded where the guy put the two extra collars,(screw marks) was a pain in the a.. tho remove the mainshaft trough the bearings
-middle bearingblock with rubbing marks
-and finaly new maingear to replace the raptor maingear


If not self assembling and you don't know the guys abbility to built, be carefull and best is to disassemble and check everything.

Did two flights and everything is holding perfekt even with a raptor maingear that is 1.5 mm smaller because of the heating. Will change the raptor gear with the new helicall gears when they are in.

Mario
11-04-2007 11:36 AM
 
 
helicrasher
Senior Heliman
Location: Belgium

Forgot to mention,

There is however, one positieve side on this:

have two extra, nice metalcolor anodisided collars for a mainshaft

Mario
11-04-2007 11:39 AM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

Mario,

Thanks for the update, I found it quite odd because I've got 3 Hurricans and 2 Xtremes here. I did spin the teeth on one of our Xtreme main gears but it was because I didn't take the time to set the pinion and backlash properly.

Happy Flying,

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
11-04-2007 12:41 PM
HOMEPAGE  
 
 
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RJX Hobby Hurrican 50 - Xtreme 50 > Maingear problem
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