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E-flite . Futaba-RC . Next D

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e-Minicopter Joker > MJ2 Crash Avoided?
 
 
nooobsVeteran - Location: Toronto, Canada -
Inspected my MJ2 today and I found this...

This is a 12T motor pinion. Has anyone seen something like this?

05-13-2008 11:34 PM
HOMEPAGE  
 
 
phil007
Senior Heliman
Location: Austin, Texas

Isn't that the same failure that was seen here and here?

Phil
05-13-2008 11:46 PM
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littleman
Key Veteran
Location: state college pa home of Penn State

looks to me like the belt was riding high(or low) on the pinion. I have heard (i think) of that on a tail pulley but not a pinion. However, I think the reasoning is the same, belt not riding in the middle.
A.J.

Proud member of Teams Minicopter Acrobat and CYE
AIM minicopter3d with questions
05-13-2008 11:56 PM
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ehx
Senior Heliman
Location: Northern Minnesota

Count yourself lucky and get a shim glued on there to keep the flange from coming off. See http://www.runryder.com/helicopter/t382540p1/

I love the newer 13T and 12T pinions, but the flanges just aren't as durable as on the older, bigger pinions. Gluing on a shim fixes that potential problem.

Of course you don't want the belt to ride excessively hard against either flange. To check this video the belt pinion area during a flight. You will see the belt move up and down against either flange depending on blade pitch/motor load, but it shouldn't be pushing too hard.
05-14-2008 04:34 AM
 
 
nooobs
Veteran
Location: Toronto, Canada

ehx

Thanks for the tip. Do you suggest pushing the cap back on and gluing a shim?

I'm a bit hesitant to use glue on something rotating at high speeds.
05-14-2008 08:41 PM
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fergus
Veteran
Location: Ireland

Rosauro I would replace that one and use the method Gerd describes in the other thread to check alignment of the next pinion. The belt is the only thing that could have caused the pinion to seperate.

Regards

Fergus

Regards

Fergus
05-14-2008 09:06 PM
 
 
nooobs
Veteran
Location: Toronto, Canada

Hey Fergus

Yes I've placed an order for a new one.

There must be a more precise way of aligning the rear gear with the front pinion. Maybe Gerd can provide some measurements on how low/high the pinion should sit relative to the bottom of the motor holder or motor plate.

Mmmm... time to pull out the laser leveler...
05-14-2008 09:14 PM
HOMEPAGE  
 
 
ehx
Senior Heliman
Location: Northern Minnesota

I'd put a drop of super glue in the crack and push the flange back. Then use some fairly fast setting glue to add a shim. I used "4 minute" JB Weld. I've got hundreds of flights on a 13T pinion I did that way and the flange is going no where. No noticeable wear on the belt yet either.

You can't really align this belt to always run in the center. Because it's the power belt it will run flange to flange as the motor mount platform bends. You can add bracing to the front of the motor mount to help, but my guess is the motor shaft can bend a tiny bit also.

A glued shim is cheap insurance that can't hurt. Also, a video of your particular belt in action will really show you what's going on. If it's always staying on one flange no matter the load then you do need to make some adjustments.
05-14-2008 10:39 PM
 
 
Seablade
Veteran
Location: floating around

before you glue it spray it with "electrical contact cleaner" or "Brake cleaner" spray. They leave no residue. Other chemicals, alcohol or acetone for example, will leave a residue and you will not get a good surface to glue onto.

"Vini, Vidi, Velcro"
05-15-2008 02:29 AM
 
 
500Driver
Senior Heliman
Location: Columbus, OH

Noobs,

Seems like you just ended up with a bad batch of Joker parts! You've been plagued with gremlins.

Thanks for sharing your find though...I'll definitely be inspecting my pulleys much closer.

When in doubt...auto out
05-16-2008 08:22 PM
 
 
nooobs
Veteran
Location: Toronto, Canada

To be very honest my patience is running thin... I'm not having a good experience with the Maxi-Joker2. It's been nine months now and still can't get this heli up. Valuable time and money gone up in smoke. Not impressed.
05-17-2008 04:44 AM
HOMEPAGE  
 
 
daytonabeach
Senior Heliman
Location: Oslo, Norway

Ross!

Take a look at my picture here;
http://runryder.com/helicopter/t434309p1/?p=3495673#RR

Could it be that your problem is the opposite of mine?
Could it be the alignment between the gears that causes this?
Mine tends to ride downwards, and yours upwards...

How can you actually know its aligned properly?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
05-25-2008 04:52 PM
HOMEPAGE  
 
 
Seablade
Veteran
Location: floating around

feel for you noobs, you are just not having any luck with this heli.

"Vini, Vidi, Velcro"
05-26-2008 12:21 AM
 
 
nooobs
Veteran
Location: Toronto, Canada

Mmm... the belt seemed to have moved downwards as it pushed the flanged "off" on mine. I'm not sure what's causing your premature wear.

Seablade if I still can't get this going after the new pinion I don't know what else to do. Collecting dust on the ground is not what a heli is suppose to do.
05-26-2008 03:53 AM
HOMEPAGE  
 
 
BungeeMike
Senior Heliman
Location: Honolulu, Hawaii

Sorry to hear you guys are having problems with your v2's I have a fully dialed in bug free v1 if you want to trade I could use yours for a parts bird. I know its frustrating I have had my share of bugs as well on my v2 hence the reason for keeping the v1. I can also deliver to Canada as I will be traveling there on holiday.
Aloha Bungee
05-26-2008 08:39 AM
 
 
Seablade
Veteran
Location: floating around

Noobs, You've done everything right or you've found out how to do it right after learning how not to do it.
I'm just now getting around to getting mine back to flight status after my New Years Day crash so I'm going over everything in detail and I'm finding the usual crash related damage which I didn't see after my quick look back then, but nothing like the gremlins your having. (my boats been worse then your MJ-2!)
You know it's a good heli. It's interesting to read BungeeMike's comments about the V1. Is the V2 showing more problems overall in little things then the V1? I can't see what would be different in the manufacturing as I'm assuming Gerd is using the same tried and true methods he's used on the V1.
It's just one of those things where your getting hit with small problems which result in big damage when they fail.
If this hasn't put some paranoia in you every time you take it out I don't know what will, but I'll bet your really learning how to do a good pre-flight. I'd tell you to stick with it and I know your frustrated, but you are not getting the return you should be getting for the money you've spent on it.

There's some kind of Voodoo hex on it...I'd take it to the local priest and have him bless it. What have you got to lose?

I'm glad your having good luck with the Trex 600.

"Vini, Vidi, Velcro"
05-26-2008 09:09 AM
 
 
nooobs
Veteran
Location: Toronto, Canada

Oh well. Another DB crash.

As I said before the crash...

Bungee thanks again for the offer. But it's probably best to move on. You previously mentioned "bullaculla". Yes plan "B" was initiated a couple of weeks ago. Plac C is in the works.

Still not sure what I'll do with the MJ2. It's practically a brand new kit but I don't think I can take another crash or let alone fly it without any trust. I'll probably clean it up, sell and continue with my alternate plans. I really can't afford to waste any more time and throw money into the pit without any return. Quite a disappointing experience.

Seablade yes the "junker" Trex600 has been awesome. Go figure.
05-26-2008 11:59 PM
HOMEPAGE  
 
 
nooobsVeteran - Location: Toronto, Canada -
Decided to give it another go...

Well this time I used a laser to line up the pinion. It worked. Maybe I got lucky...

After several flights the belt stayed in the center of the pinion and belt wheel.

06-30-2008 10:33 AM
HOMEPAGE  
 
 
daytonabeach
Senior Heliman
Location: Oslo, Norway

Well hello there, im veeeeery happy to see your bird back in the air again, hope you have solved everything now, otherwise you should see a vodoo doctor

Cool the black box solution you made as well, way to go

Chris

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
06-30-2008 12:44 PM
HOMEPAGE  
 
 
Seablade
Veteran
Location: floating around

Also glad to hear it!

"Vini, Vidi, Velcro"
06-30-2008 11:35 PM
 
 
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e-Minicopter Joker > MJ2 Crash Avoided?
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