RunRyder RC Helicopter Topic - Design issue? Or just bad luck Tail mystery solved.

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e-MSH Protos 500 > Design issue? Or just bad luck Tail mystery solved.

PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

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Well as many of you know I thought I was chasing another gyro
problem. The first time this happened I went down the same damn path.
The REAL problem was the pin that goes through the tail rotor shaft.
The first time it somehow worked its way up and then started stripping out the plastic pulley. It was causing the tail blades to not have enough bite in the air. They were just spinning but not insync with the main blades. ALmost like a slipping clutch.
So I order up some new parts repair it and get ready to fly. This time
it APPEARS the rotors are spinning with the main blades but AGAIN the pin had worked its way up and was spinning like a slipping clutch.
I never thought this would or could happen again. But I took it over to my mentors house and he found the problem AGAIN!! This whole time I thought it was the gyro. So since the stripping of plastic was just beginning I was able to use the plastic piece still. I hand made a pin that fits the slot. The pin I got from Protos is about 25 % shorter that the slot it fits in. I dont know if this is part of the problem. But the larger pin should reduce the chance of this happening again. I pushed the new pin down in the slot then I applied just a touch of CA to keep it in there. I made sure I followed the build sheet the first time I put the tail together and I did again this time. It calls for two shims on either side but I wonder if the shims opposite the pin arent thick enough to press the pulley on the other side keeping the pin in place.

Since this happened twice really aggregating me I thought I would share since this might happen to you. As an engineer I dont like the design.

11-05-2009 02:42 AM

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Ecaf
Heliman
Location: West Dundee, IL

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The design is now fine. I was an issue last year. Do a search on the updated tail pulley on this and other forums for details.

11-05-2009 01:43 PM

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Ecaf
Heliman
Location: West Dundee, IL

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This is what you tail pulley should look like. If your cross pin is shorter, it should be replaced with the proper one.

11-05-2009 01:51 PM

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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

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that is NOT the pin I have its only about 75% of that length.

It DOES look like the pin I MADE however

11-05-2009 03:00 PM

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povern
Senior Heliman
Location: LF, MN

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I fly out of taller grass. and the pin was enlarging the groove for it. So I starts to expoxy the pin to the gear. Very light amount. This prevented the pin from working loose and damaging the gear and, with a little force, allowed me to remove the pion when needed.

Or you could get the metal gear upgrade over at infinity hobbies.

Oh boy, I get to do another rebuild, yeaTrex 450: With G5 Head, 65MG, 7703d, 9257, 2221-6, 60A Scorp

11-17-2009 05:40 PM

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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

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Povern can you tell me about the upgrade and where to get it?

thanks

11-17-2009 05:58 PM

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laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

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Quote
Or you could get the metal gear upgrade over at infinity hobbies

Esprit Model Flight Team, Logo 600 VBAR Xera 4030, Logo 500 Mini-VBAR Xera 4020, 3DMP-E VBAR soon!

11-17-2009 06:23 PM

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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

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is there a website? I googled infinity hobbies and got no website

11-18-2009 01:39 AM

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gorn
Elite Veteran
Location: Western Australia

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really?
I just typed exactly that into google, and the very 1st result was correct.

If you bling it, they will come :D

11-18-2009 04:24 AM

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ff7
Heliman
Location: Bosnia

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Here`s the link
http://www.infinity-hobby.com/main/...roducts_id=4998

11-18-2009 04:28 AM

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Altrex
Senior Heliman
Location: WI

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thats some nice lookin tail

11-18-2009 04:38 AM

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povern
Senior Heliman
Location: LF, MN

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Here is the link for just the pulley:

Oh boy, I get to do another rebuild, yeaTrex 450: With G5 Head, 65MG, 7703d, 9257, 2221-6, 60A Scorp

11-18-2009 11:31 AM

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povern
Senior Heliman
Location: LF, MN

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http://www.infinity-hobby.com/main/...baf1a8d2cb3cecd

There is the link for just he metal pulley

povern

Oh boy, I get to do another rebuild, yeaTrex 450: With G5 Head, 65MG, 7703d, 9257, 2221-6, 60A Scorp

11-18-2009 11:33 AM

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laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

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No link

*******Edit****** It just showed

Esprit Model Flight Team, Logo 600 VBAR Xera 4030, Logo 500 Mini-VBAR Xera 4020, 3DMP-E VBAR soon!

11-18-2009 11:34 AM

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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

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thanks
I did a google and didnt get very far.

11-19-2009 04:03 AM

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e-MSH Protos 500 > Design issue? Or just bad luck Tail mystery solved.

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