RunRyder RC
WATCH
 1 page 949 views POST REPLY
HomeAircraftHelicopterAlignT-REX 700N › Starter Shaft Slippage
09-21-2013 11:47 AM  5 years agoPost 1
jonathancassar

rrApprentice

Mtarfa, Malta - Europe

My Posts: All  Forum  Topic

Guys I am trying to start my OS 105 for the first time. I am noticing that the starter shaft (the one which engages to the one way bearing inside the clutch) is slipping sometimes and wont turn the engine. It does this intermitently sometimes the one way bearing grips well and turns the engine normally. Is it normal for this one way bearing and shaft to slip inside each other or do I have a worn out shaft? BTW my clutch is a brand new Quick UK heavy duty clutch so the one way bearing should be fine.

PM  EMAIL  Attn:RR  Quote
09-21-2013 12:22 PM  5 years agoPost 2
meowguy

rrVeteran

Saco, ME

My Posts: All  Forum  Topic

The angle of attack of the starter motor shaft is very important. Try different angles and varying pressure and see if that helps. That usually works for me as mine slips once in a while also.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2013 12:32 PM  5 years agoPost 3
jonathancassar

rrApprentice

Mtarfa, Malta - Europe

My Posts: All  Forum  Topic

What do you exactly mean by the angle of attack of the motor shaft? You mean changing the angle of the whole pinion block to try and thrust the one way bearing against the shaft side?

PM  EMAIL  Attn:RR  Quote
09-21-2013 01:40 PM  5 years agoPost 4
mhawk

rrApprentice

Jonesboro Ar

My Posts: All  Forum  Topic

Mine does it at times also. Instead of having it completely vertical try it going at a little bit of an angle

mike (mhawk)

PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2013 03:36 PM  5 years agoPost 5
balsapro

rrVeteran

Gallatin,TN

My Posts: All  Forum  Topic

so this is a very common problem... and it is exacerbated by large displacement engines with high compression.

after trying every other idea that is talked about on RR... tryflow, tf fluid, shaft alignment, flat spots on the starter cone ect.... and many new clutches by other manufactures lynx, quick uk, and align

this is what I did and it seemed to help start the ys 120 in my trex.

I went back to a stock align clutch and sanded the starter shaft...

the starter shaft has a black coating on it. this coating is slick and allows the roller bearings to slip under pressure. I Sanded the coating off of the bottom of the start shaft, this also roughed the surface up a little.

this did not stop the slippage 100% but made it a lot less of a problem.

when I first mentioned the idea on RR many shunned me, saying a rough surface is not ideal it would eat up the roller bearings. however, reality proved differently.

Build the Best, Fly the Best, Crash the Best

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-21-2013 03:57 PM  5 years agoPost 6
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

The bottom of the Align shaft is not hard enough. Picture of divots attached:

According to this: http://www.alignrcusa.com/index.php...products_id=949

the 700N clutch has the same bearing as the 600 auto hub. So you might try installing a Boca FC12 one-way bearing in there. This is the only one-way that I know of that is actually better. It is an NSK FC12 clone.

Hint: Sand the oxide off of the outside of the bearing and the inside of the clutch and install with Loctite 603.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-21-2013 04:46 PM  5 years agoPost 7
jonathancassar

rrApprentice

Mtarfa, Malta - Europe

My Posts: All  Forum  Topic

Thanks everyone for your inputs. Balsapro what you say makes sense. Actually roughening up the shaft would not harm the one way bearing much in my opinion since usually this shaft ends up turning with the engine whilst the engine is running due to the drag inside the one way.
The Boca FC12 looks interesting. It has three rolling elements in the picture for each pocket so it might provide for more drive.
Unfortunately it seems that I'll have to remove the engine out again to make these mods

PM  EMAIL  Attn:RR  Quote
09-22-2013 10:46 AM  5 years agoPost 8
meowguy

rrVeteran

Saco, ME

My Posts: All  Forum  Topic

What do you exactly mean by the angle of attack of the motor shaft? You mean changing the angle of the whole pinion block to try and thrust the one way bearing against the shaft side?
What I mean by this is the shaft that is attached to your electric starter motor. It has a 6mm ball driver on the end. Try applying it at a slight angle with varying amounts of pressure, instead of perfectly perpendicular. That's all. It may get you going.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 949 views POST REPLY
HomeAircraftHelicopterAlignT-REX 700N › Starter Shaft Slippage
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Tuesday, November 20 - 1:23 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online