Notices
Questions and Answers If you have general RC questions or answers discuss it here.

OS 25 Trouble

Old 08-15-2016, 01:28 PM
  #1  
Champstarr
Thread Starter
 
Champstarr's Avatar
 
Join Date: Aug 2014
Posts: 118
Likes: 0
Received 0 Likes on 0 Posts
Default OS 25 Trouble

Hi Everone,

I run OS 25 engines on my combat planes. All work fine except for one. I cannot start it as I don't think it is drawing fuel. Also when I manually rotate the prop it turns fine for about four or five rotations then the prop becomes difficult to turn for one revolution (when the prop is pointed to the ground). Then rotates easy again for the next for revolution then gets difficult to turn again. I am using 10% nitro fuel, 9x5 prop, mac header and mousse can. Why would the prop turn normally then be difficult to turn for a revolution? Any ideas or advice is appreciated.

Thanks
Old 08-16-2016, 03:21 AM
  #2  
aspeed
 
aspeed's Avatar
 
Join Date: Jul 2011
Location: Ruthven, ON, CANADA
Posts: 3,460
Likes: 0
Received 7 Likes on 7 Posts
Default

If it is new, then maybe it is just wearing the oil away, and is squeaky. If it has been crashed, maybe something is bent, or a G clip is off or ? If it is just squeaky tight, maybe just heat it up with a hair dryer for the first couple of starts.
Old 08-16-2016, 07:21 AM
  #3  
Bax
My Feedback: (11)
 
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,483
Likes: 0
Received 6 Likes on 5 Posts
Default

If the propeller will turn over smoothly for several rotations but become stuck or stiff after that for a rotation or two, you have something out of alignment. It's possible you have something bent that gets in the way once in a while, something moving out of position, and so on. The only way to check is to do a teardown and really inspect the components and their fit.
Old 08-16-2016, 02:33 PM
  #4  
A. J. Clark
 
A. J. Clark's Avatar
 
Join Date: Mar 2004
Location: Craigville, IN
Posts: 740
Received 23 Likes on 22 Posts
Default

Maybe the bearing is not good anymore or you have some dried up crap in the motor and bearing. Would have to take it apart to be sure.
Old 08-16-2016, 03:26 PM
  #5  
j.duncker
My Feedback: (2)
 
j.duncker's Avatar
 
Join Date: Jun 2004
Location: Sailing in the Eastern Caribbean
Posts: 4,047
Likes: 0
Received 1 Like on 1 Post
Default

If your OS has a plated liner you may be experiencing the plating peeling off.

Certainly matches the symptoms of a peel.

Not worth fixing even if you can find new parts. IMHO
Old 08-16-2016, 05:51 PM
  #6  
Champstarr
Thread Starter
 
Champstarr's Avatar
 
Join Date: Aug 2014
Posts: 118
Likes: 0
Received 0 Likes on 0 Posts
Default

This Engine has not been flown yet. I could not get it to operate correctly so I sent it back to OS. The replaced some of the cylinder and piston assembly (their description). So I doubt it is a bad bearing or that something was damaged. A tear down it is then.

Thanks

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Manage Preferences - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.